NC0066974_Complete File - Historical_20171231

" Ensineer Dat- 'cc.
NPDES WASTE LOAD ALLOCATION - cA 167.671Z1111l'��_K /_I /
g . " Facility Name: H i C-k o r if I e-Nt.Q .JC- SL C�'v,5/ar, Date s - /y -F
�
Existing O R :-'-
Proposed ( Diviv,`,' 1 Permit sb.: N C_o o (a 6 7 I Pipe .b. : 0 0 ! County: ga-o
t3 Design Capacity (I : Q. U yo Industrial (% of Flow): C.) Ebmestic ( % of Flow) : / a
g Receiving Stream: L4twZro -o WclitA S n k Class: 0 3 og 3
�.r�l C Sub-Basin:
'� Reference USGS Quad: C- l '[ N U (Please attach) Requestor: USA- ,e c_(!� Regional Office /11 l� d
i
i C Cteltlyt i'a S-0,
(Guideline limitations, if applicable, are to be listed on the back of this form. )
Design 'Damp.: Drainage Area (mi2) : D-/S Avg. Streamflow (cfs) : 0. 2 o
7Q10 (cfs) 0 Winter 7Q10 (cfs) 0 30Q2 (cfs) 6 . 0 6
Location of D.O. minimum (miles below outfall) : Slope (fpm)
Velocity (fps) : K1 (base e., per day): K2 (base e. rer day) :
gS✓rn n-,44 cA. d-8Y
Effluent Monthly Effluent - ;'onthly
Characteristics Average Comments/ Characteristics Lverage Comments
g S c� c o�J ✓1.4- t o r'Y G
0 N!� d /� y "-36
E3 '
�0 Gc /` C 6
TSS [r 3o '- 30 '''�
dCoI1-'t'v/'m / v /ioo i"— /Oo0/I0O ,-..P
H _ l 4 G—q Sw Cc T S
ICrig' Al - den ip Comments:
Revi M, . on O
0:9' :on O j,
ed By: Reviewed By: -71, ‘// Date: (7/0Z 2/6

WASTELOAD ALLOCATION APPROVAL FORM request No. :;d1ye
Facility Name : HICKORY CREEK SUBDIVISION
Type of Waste : DOMESTIC
Status : PROPOSED
Receiving Stream : UT TO CROWDERS CREEK
Stream Class : C
Subbasin : 030837
County : GASTON
Regional Office : MOORESVILLE Drainage Area (sq mi ) : 0. 18
Requestor : L. CREECH Summer 7010 (cfs) :
Date of Request : 5-15-86 Winter 7010 (cfs) :
Quad : G 14 NW Average Flow (cfs) : 0.2
RECOMMENDED EFFLUENT LIMITS
:
Wasteflow (mgd) : 0.040
5-Day DOD (mg/1 ) : 5
Ammonia Nitrogen (mg/1 ) : 2
Dissolved Oxygen (mg/1 ) : 6
TSS (mg/1 ) : 30
Fecal Coliform (#/100m1 ) : 1000
off (SU) : 6-9
COMMENTS
PROPOSED DISCHARGER.
FLOWS: S7010=0, 30Q2=0.06.
THEREFORE, RECOMMEND 5&2 LIMITS.
.l4se4i e A://10,9ss frb e7 e Ae.e. ice:y A 5-e-ae,09/ °.�.l�y Res ' /4,0s ,�e�� 4 ,1i' c4r4
!dam fi.G!_L" rrf .5) L .P. h► ux e�.rk�ot�ate_e Cert, � J ;..J1.F�/t . / ee..6.�u-Kn0
7co Air 1�l�e , ✓✓✓
Recommended by _ _ _ ____ Date 7- 2 1 ^ bap
Reviewed by: i�/�
Tech. Support Supervisor __ _41 Date _ .,_3l/4
Regional Supervisor hve EnC-117,0L
"' Date 17- 8Fie
Permits & Engineer in.'��� Date LL/J&___
Water Quality Section Chief tad_ __ r Date W&

0° • 0 °' r4//
@ �� � , w 803 1
��=tN1 . ti, �o� g6c ?.17
*Ise.,.
��: State of North Carolina $6ti-0 38'
� Iartment of Natural Resources and Community Development
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor R. Paul Wilms
S. Thomas Rhodes, Secretary b 1 Director
Subject: NPDES Permit Application
NPDES Permit No. NCOO
County
Dear •
This is to acknowledge receipt of the following documents on •
Application Form,
Engineering Proposal (for proposed control facilities) ,
Request for permit renewal ,
Application Processing Fee of $_
Other
The items checked below are needed before review can begin:
Application form _ ( Copy enclosed) ,
Engineering Proposal (See Attachment) ,
Application Processing Fee of $
Other _
If the application is not made complete within thirty (30) days , it will
be returned to you and may be resubmitted when complete .
This application has been assigned to
(919/733-5083) of our Permits Unit for review. You will be advised of
any comments recommendations, questions or other information necessary
for the review of the application.
I am, by copy of this letter , requesting that our Regional Office
Supervisor prepare a staff report and recommendations regarding this
discharge . If you have any questions regarding this application, please
contact the review person listed above .
Sincerely,
Arthur Mouberry, P .E .
Supervisor, Permits and Engineering
cc :
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

ORTH CAROLINA DEPT. OF NATURAL RESOURCES AND COMMUNITY DEVELOPMENT
ENVIRONMENTAL MANAGEMENT COMMMISSION
NATIONAL NI ,�� DISCHARGE ELIMINATION SYSTEM
APPLICASd,Q�V FQR`� DOA6Ektf{g DISCHARGE - SHORT FORM G FOR APPLICATION NUMBER
9F E:�p,�r�,�.,EHTAL AGENCY ^�IG'Io ID llc, I6 Ir i 7 I
USE DATE RECFIVIU
To be filed o1141 y cervices, wholesale and retail trade, I� I IS Ie� (6
and other coimne iaY'�esd hments including vessels
YEAR MO. DAY
mooRESVILIE -1°;
RfCO
AL OFf114 I
Do not attempt to complete this form without reading the accompanying instructions
Please print or type
1. Name, address, and telephone number of facility producing discharge
A. Name HICKORY CREEK SURT)TVTST()N
B. Street address Meeks Road
C. City Gastonia, 0. State NC
E. County GASTON F. ZIP 2R114
G. Telephone No. 704 - 866-4675
Area •
Code
2. SIC
(Leave blank)
3. Number of employees 100 single family homes ; 2 _ 74 pPrSnnc pr haus®hold ( concus
population
4. Nature of business residential
•
5. (a) Check here if discharge occurs all year, or
(b) Check the month(s) discharge occurs:
1.oJanuary 2.oFebruary 3.oMarch 4.0April 5.OMay
6.0 June 7.aJuly 8.oAugust 9.13 September 10.oOctober
11.o November 12.o December
(c) How many days per week:
1.01 2.02-3 3.04-5 4. 16-7
6. Types of waste water discharged to surface waters only (check as applicable)
Flow, gallons per operating day Volume treated before
discharging (percent)
Discharge per - -
operating day 0.1-999 1000-4999 5000-9999 10,000- 50,000 None 0.1- 30- 65- 95-
49,999 or more 29.9 64.9 94.9 100
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
A. Sanitary, daily 36 , 000 X
average
B. Cooling water, etc.,
daily average
C. Other discharge(s),
daily average;
Specify
D. Maximum per operat-
ing day for combined
discharge (all types)

7. If any of the types of wa,te ideiL tee or un-
treated, are ::ischarged to places other than suria‘e Meters, uiros below
as applicable.
Waste water is discharged to: 0,1-999 1000-4999 • 5000-9999 10,000-49,999 50,000 .or more
(1) (2) (3) (4) (5)
A. Municipal Sew.•r System
•
II, Ilnilrwvunrl WI•II
r
C. Scpt.h tank
U. Evaporation lagoon or pond
E. Other, specify:
8. Number of separate discharge points:
A. dXl 8,0 2-3 CA:3 4-5 D.O 6 or more
9. Name of receiving water or waters
.10. Does your discharge contain or is it possible for your discharge to contain
one or more of the following substances added, as a result of your operations,
activities, or processes: ammonia. cyanide, aluminum, beryllium, cadmium,
chromium, copper, lead, mercury, nickel, selenium, zinc, phenols, oil and
grease, and chlorine (residual).
A,ci<yes 8.O no •
I certify that I am familiar with the information contained in the application and
that to the best of my knowledge and belief such information is true, complete, and
accurate_
Herman Eugene Ratchford Sr
Printed Name of Person Signing
President — Triangle Real Estate
Title
April 28th , 1986
Date Application Signed
Git:'7, iy".-i;;2
Signature of Applicant
:orth Carolina General Statute 143-215.6(b) (2) provides that: Any person who knowingly makes
:ay false statement representation, or certification in any application, 'record, report, plan,
Ir other document files or required to be maintained under Article 21 or regulations of the
:nvi.ronmental Management Commission implementing that Article, or who falsifies, tampers with,
)r knowly renders inaccurate any recording or monitoring device or method required to be
operated or maintained under ATtiC1e 2}�_•or regulations .of the Environmental Management Commis:•;o
!mplementing that Article, s.hali rbe.guii.ty, of a misdemeanor punishable by a fine not to exceed
uQ,Qo0, or by imprisonmant' not to exceed six months, or by both. (18 U.S.C. Section 1001 prow:_:
t punisi-ent by a fine of-not more than S10,000 or imprisonment not more than 5 years, or both,
=c;r a similar offense.)

r , ., August 4, 1986
NPDES STAFF REPORT AND RECOMMENDATIONS
County Gaston
NPDES Permit No.NC0066974
PART I - GENERAL INFORMATION
1. Facility and Address: Proposed Hickory Creek Subdivision
c/o Triangle Real Estate
P.O. Box 12524
Gastonia, N. C. 28053 - 12524
2. Date of Investigation: July 29, 1986
3. Report Prepared By: Michael L. Parker, Environmental Engineer I. �/Y (�"
4. Persons Contacted: Mr. F. Roger Watson, Engineer; Mr. Herman Ratchford
Telephone No. (704) 866-4675
5. Directions to Site: From the jct. of hwy. 274 (Union Rd) and SR 2425
(Sinai School Rd.) in southern Gaston Co. , travel south on SR 2425 approx. 0.5
miles and bear right onto SR 2426 (Meeks Rd.) . Travel 0.45 miles and the en-
trance to the site will be on the right side of SR 2426 via a dirt access road
6. Discharge Point - Latitude: 35° 09' 56"
Longitude: 81° 09' 27"
Attach a USGS Map Extract and indicate treatment plant site and
discharge point on map.
USGS Quad No. Gl4NW
7. Size (land available for expansion and upgrading) : There is ample area
available for the construction of the proposed WWT facilities.
8. Topography (relationship to flood plain included) : Proposed WWTP location
is not in or near a flood prone area. Rolling topography, 3-12% slopes.
9. Location of nearest dwelling: No dwellings presently located on site.
Future occupied dwellings should not be located closer than 200 feet to
the proposed WWT facilities. Buffering (fence, shrubbery, etc.) shall
be provided.
10. Receiving stream or affected surface waters: U.T. to Crowders Creek
a. Classification: C
b. River Basin and Subbasin No. : Catawba 030837

r •
c. Describe receiving stream features and pertinent downstream uses:
Receiving stream was located in an agricultural area. No upstream or
downstream dischargers known. Although some flow was observed in the
stream during the site investigation, field observation would indicate
the 7Q10 to be at or near O.Ocfs.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: 100% Domestic
a. Volume of Wastewater: 0.036 MGD
b. Types and quantities of domestic wastewater: Applicant has indicated
a flow of 0.036 MGD, however, this is based on local census population.
Applicant indicates each home will have three (3) bedrooms which places
the actual design flow at 0.045 MGD. This should be clarified if an
NPDES Permit is issued.
c. Prevalent toxic constituents in wastewater: N/A
d. Pretreatment Program (POTWs only) N/A
2. Production rates (industrial discharges only) in pounds N/A
3. Description of industrial process (for industries only) and applicable
CFR Part and Subpart: N/A
4. Type of treatment (specify whether proposed or existing) : Proposed WW
treatment will be a package type WWTP consisting of an influent bar screen,
an aeration basin, secondary clarification, (with sludge return) and effluent
disinfection.
5. Sludge handling and disposal scheme: To be removed periodically by
septic tank contractor. Ultimate disposal should be determined prior
to Permit issuance.
6. Treatment plant classification: Unknown at this time
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grants Funds
(municipals only)? No

2. Special monitoring requests: Recommend minimum
3. Additional effluent limits requests:
4. Other:
PART IV - EVALUATION AND RECOMMENDATIONS
Applicant proposes to construct a package type WWTP to serve a proposed
subdivision containing 100 homes.
The site appeared suitable for the construction of a WWT facility. The
size and drainage area of the receiving stream, however, raises serious con-
cerns over the suitability of this site for a WWTP. During the site investi-
gation some flow was observed in the proposed receiving stream. Information
and photographs given to the writer by nearby residents indicated that the
stream, on numerous occasions, was completely dry. The stream also passes in
close proximity to several homes less than 1.4 mile below the proposed discharge
location. Frequent human contact could be expected with the stream in this
area.
It is the opinion of the MRO staff, that permitting a discharge of
this volume may have a detrimental effect on the quality of water in the
receiving stream. Futhermore, nuisance conditions are a concern.
It should also be noted that the applicant has a suitable area on site
with which to construct a non-discharge spray irrigation facility to handle
WW from the proposed development. The writer discussed this alternative with
the applicant's engineer who indicated that if the request for the Permit was
denied, he would explore the feasibility of this type of system.
This Office feels that serious consideration should be given to issuance
of this Permit, due to the potential for nuisance conditions and downstream
human contact. Proposed facilities (ie package type extended aeration WWTP)
could not be expected to consistantly comply with anticipated limitations of
BOD5 - 5 mg/1 and NH3 as N - 2 mg/l. An alternative to a discharge T system
exists at this site. WW For these reasons, this Office recommends that the
request for a Permit be denied.
)770
Signature of report preparer
Water Quality Regional Supervisor

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My name is Graham Mullen and I represent Triangle Real
Estate of Gastonia, Inc. , applicant for NPDES permit for Hickory
Creek Subdivision . I am here this evening to urge that the
proposed permit be issued. We recognize that a large number of
people oppose our application. However, we believe that many who
oppose the application are not in fact affected by the proposed
facility. If you will note the maps which I am posting, you can
see that there are no houses within fifteen hundred ( 1500 ) feet
of the proposed plant. In addition, we have caused the drainage
basin to be indicated on the map and there are only twelve ( 12)
people who have complained who actually live down stream and
within the drainage basin. Five (5) people live in the drainage
basin but are on elevations higher than the subject property. I
strongly believe that the only people who have any standing to
assert that they are adversely impacted by the water quality of
Hickory Creek are the twelve ( 12) people who are down stream from
this subdivision.
The fact that only twelve ( 12 ) people are down stream
does not, however, change the obligations of the developer here
to proceed strictly in accordance with the law. It does, how-
ever, in our opinion, impact on the credibility of large numbers
of opponents.
Observations about the opponents ' credibility aside,
there are a number of points that I feel are appropriate to urge
on behalf of Triangle Real Estate. First, the proposed permit
GM-46

contains the toughest , most stringent criteria for an NPDES
permit for a treatment plant in the State of North Carolina. The
plant will have to meet those standards, and under those
standards, the people down stream will not be adversely impacted.
Mr. Roger Watson , a licensed professional engineer who has
assisted in the design of this plant and the layout of the
subdivision has been out on this property on a regular basis. On
June 25, 1986 , which marked the last date of the longest stretch
of the worst drought in Gaston County, Mr. Watson observed flow
in the creek. At no point durinig the drought did Mr. Watson
observe that the flow stopped. Thus, it seems that the creek has
flow in it and the standard of the effluent as noted will be
extraordinarily strict under North Carolina standards . We ,
therefore , believe that Triangle Real Estate will meet the
State ' s standards and is eligible for the permit to be issued. I
think I ought to point out a number of other things as well .
This system will be monitored on a regular basis. Samples will
have to be taken regularly and the results of testing those
samples sent to Raleigh for comparison to the standards. If the
plant doesn ' t continue to meet standards, corrective measures
will have to be taken until it does. For example, additional
filter systems that cost thousands of dollars would have to be
installed. In short, the quality standards will be maintained
throughout because the State permit system requires it. In con-
trast, if the permit is denied, the development will have to go
-2-

forward using a septic tank system. Significant portions of this
property can be developed with septic tanks. Nevertheless, a
septic tank system is not monitored on a regular basis and one
really bad septic tank will deteriorate the quality of Hickory (
Creek worse than this entire plant. Concern over septic tank
systems is not misplaced. Health Department records indicate
that three ( 3) septic tanks in the downstream subdivision have
experienced difficulties in the past and as noted those systems
are not monitored as closely as the proposed plant.
I believe there are other additional reasons to permit
this plant. The system will be operated by Environmental Waste
Water, a very experienced company. We are advised that they have
operated a plant in Cabarras Company very similar to the proposed
plant which exceeds the standards required for this permit. We
anticipate that they will have no difficulty meeting the proposed
standards here. Further, in the event the County ever develops a
system of its own, there will already be lines and a sewer system
in place for this subdivision. It will not be necessary to go
and take people off of septic tank systems and put them on a
County system in this Hickory Creek Subdivision.
Finally, I believe that this particular permit applica-
tion is crucial for the economic development of Gaston County.
Our County has poor soils for septic systems. There is only so
much waste that can be put into the ground in our County.
Package plants of this nature are critical to the continued
-3-

ability of our area to grow and develop and that growth and
development is happening willy-nilly, spilling over out of
Mecklenburg County whether we want it to come or not. This type
of plant with its stringent water quality standards recognizes
that growth can be managed, that the environment can be dealt
with and protected and that responsible developers will get
permits and will be permitted to go forward with their develop-
ments regardless of emotional arguments and the number of people
making those arguments.
-4-

Attachment # 4
HICKORY CREEK FLOW MEASUREMENTS Page 1 of 2
Date Flowrate Calculation
6/18/86 0.0387 cfs ** 0.0387 = 2' x .0833' x 10' - .0490 *
19 sec
6/23/86 0.0204 cfs 0.0204 = 1.8333' x .0833' x 10' - .0490
22 sec
6/28/86 0.0117 cfs 0.0117 = 1.75' x .0833'00' - .0490
24 sec
7/4/86 -0.0073 cfs -0.0073 = 1.6667' x .0625' x 10' - .0490
25 sec
7/12/86 -0.0233 cfs -0.0233 = 1.6667' x .0417' x 10' - .0490
27 sec
7/19/86 -0.0212 cfs -0.0212 = 1.6667' x .0417' x 10' - .0490
25 sec
BASES FOR FLOW MEASUREMENTS
* There are four water-to-air heat pumps upstream from gauging point: McNamara + 12 gpm
Smith + 12 gpm
44 gpm x 2.228E-3 cfs = 0.0980 cfs Bowers + 20 gp
gpm = 44 gpm
Assume heat pumps cycle 2 time during day. Therefore 0.0980 _ 2 = 0.0490 cfs
** We subtracted 2 heat pump discharge capacity from stream flow to find final flowrate.
METHOD OF MEASUREMENT
We selected a pipe under a road (Candlewick Trail ) to measure all stream flow through
Homeplace I Subdivision in order to account for confluence of tributaries. The sel-
ected gauging point accounts for all available dilution at the point receiving waters
exit our development.
The calculated flowrates should be considered conservative because in our measure-
ment method we treated a ;area of:the pipe as a rectangle. We measured the width,
depth, and length of the pipe to :encompass the stream flow; ma *ed each end of the
length, and recorded the mean time for an article to pass opposi'te .pointsio€ .the
length measurement. Styrofoam chips and ping pong balls were used to find velocity.

Page 2 of 2
Attachment # 4
METHOD OF MEASUREMENT - cont
Example.
� G Z �
Rather than integrate
the area of a semi- - , � ' 1:L ) '33 '
circle, we accounted ' > < 'rµ='''�^
for this area of the
rectangle - causing us
to overestimate flow.
We measured the time
for an object to travel /� ,
from point A to point B �_ r T' '
to find the mean velocity
of the stream. Here
several trials resulted Tyr '
in an avg 19 sec elapsed
time or 0.5263 ft/sec.
0.0387 cfs = 2' x .0833' x 10' - .0490
19 sec

NORTH CAROLINA DEPT. OF NATURAL RESOURCES AND COMMUNITY DEVELOPMENT
ENVIRONMENTAL MANAGEMENT COMMISSION
NATIONA sii CHARGE ELIMINATION SYSTEM APPLICATION NUMBER
APPLI U ''F B4O DISCHARGE — SHORT FORM D FOR NG o pi �(
ORM AL
AGENCY•
1 I I 1 C.( �� 1y
to be filedi��n''�o Q �go(�e ss, wholesale and retail trade, USE DATE RECEIVED
and other c r S1 A�E6!llishments including vessels v,��� `6 1 10 I j 1 ! l .3
1000afsvuL YEAR MO. DAY
IBMS NM
Dolnot attempt to complete this form without reading the accompanying instructions
Please print or type
1. Name, address, and telephone number of facility producing discharge
A. Name HICKORY CREEK SUBDIVISION
et address Mks Road EIV De Gastonia
D. State NC
mum srta+nko>mova. Gaston
E. County F. ZIP 28054
prAY 19 Neel No. 704 — 866-4675
litfeetsva.LE Code Mailing Address : Post Office Box
lIttiegat OW& 12524
2. SIC Gastonia, NC
(Leave blank) 28053-12524
3." Number of employees 100 Single—Family Homes : 2 . 74 persons per household
( Census Population)
4. Nature of business Residential
5. (a) Check here if discharge occurs all year , or
(b) Check the month(s) discharge occurs:
1.O January 2.0 February 3.0 March 4.0 April 5.O May
6.0 June 7.0 July 8.0 August 9.0 September 10.0 October
11.0 November 12.0 December
(c) How many days per week:
1.O1 2.02-3 3.04-5 4.0 6-7
6. Types of waste water discharged to surface waters only (check as applicable)
Flow, gallons per operating day Volume treated before
discharging (percent)
Discharge per
-
operating day 0.1-999 1000-4999 5000-9999 10,000- 50,000 None 0.1- 30- 65- 95-
49,999 or more 29.9 64.9 94.9 100
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
A. Sanitary, daily
average 36 , 000 X
B. Cooling water, etc..
daily average
C. Other discharge(s),
daily average;
Specify
D. Maximum per operat-
ing day for combined
discharge (all types)

•
7. If any of the types of waste identified in item 6, either treated or un-
treated, are discharged to places other than surface waters, check below
as applicable..
Waste water is discharged to: 0.1-999 1000-4999 J 5000-9999 10,000-49,999 50,000 or more
(1) (2) (3) (4) (5)
A. Municipal ,ewer system
II, Iln1h•rlirnunci weIl
C. Septic tank
O. Evaporation lagoon or pond
E. Other, specify:
8. Number of separate discharge points:
A.C(1 B,02-3 C.o 4-5 D,o 6 or more
9. Name of receiving water or waters Tributary to Crowders Creek
.10. Does your discharge contain or is it possible for your discharge to contain
one or more of the following substances added, as a result of your operations,
activities, or processes: ammonia, cyanide, aluminum, beryllium, cadmium,
chromium, copper, lead, mercury, nickel, selenium, zinc, phenols, oil and
grease, and ch/Orine (residual).
A,dyes B,0 no
1 certify that I am familiar with the information contained in the application and
that to the best of my knowledge and belief such information is true, complete, and
accurate.
Herman E. Ratthford , Sr.
•
Printed Name of Person Signing
President - Triangle Real Estate of Gastonia, Inc .
Title
May 8th . 1986
Date Application Signed
Signature of Applicant
•
North Carolina General Statute 143-215.6(b) (2) provides that: Any person who knowingly makes
any false statement representation, or certification in any application, 'record, report, plan;
or other document files or required to be maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, or who falsifies, tampers with,
or knowly renders inaccurate any recording or monitoring device or method required to be
operated or maintained under Article 2.1.'os• regulations •of the Environmental Management Commissio
• implementTng that Article, shal-lTbi4uiitv: of a misdemeanor punishable by a -fine not to exceed
$10,000, or by imprisonmant• nbt to exceed six months, or by both. (18 U.S.C. Section 1001 prov::
a punishment by a fine of-not more than $10,000 or imprisonment not more than 5 years, or both,
for a similar offense.)

-
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SECTION A-A INGNEUR
'TOLE OWN In CM*V Drat 00*10
III Iv SIVE 14

SPECIFICATION NO,PMC1
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' • SUGGESTED EQUIPMENT SPECIFICATION�.,x `:=f I is � �, e;. . � .
.,,-, .. �.,, - _s . . - MECHANICAL COLLECTOR. _ I,
., r1• ,,; . ,,, WASTEWATERTREATMENT PLANT . ,
[PACKAGE]
1., `tirtti:}v .^.Jiro?' t1i . ..t .J'3i:: ... .-.. .o, •:ri3, :il ._ +i. .. ..I: ?:'; , ,-.. .4., --,
1. GENERAL
* ' -- , ' The contractor shall provide and install each factory fabricated wastewater
treatment plant complete.with connecting piping and appurtenant.work as detailed on the
drawings and specified herein.,The plant shall be as manufactured by Davco div., Davis
r-. Water & Waste Industries,,Inc., Thomasville, Geor ia, or an.a roved equal. ,
}- g PP q
f y.1....)a 4irsi . ..."1-;"::1 fi is } { 'Y:� .... '�=:;:1 ,-t =few .:11. . ;4;-... •
2,:me,:SHOP DRAWINGS... is -. ,; ! ,f 1k,• :v.
:i The contractor shall submit a minimum of six (6) copies of all shop drawings to the
Engineer for approval Of these, two (2) copies will be returned to the contractor with
r appropriate action taken. Receipt of less than the minimum required number of copies will
`� be cause for'withholding the shop.drawings;.from being..checked._until receipt of the
necessary additional copies. = -
:f ' Each set of shop drawings shall include but not necessarily be limited to:
.. . =:::2,1.. ;.Drawings showing dimensions of all.steel unit,including dimensions of all
e3 -
, .-:-. ,:,.i.: compartmentau, ,;. ,,��;_,: 4t
f= .3t.b.,12.2,r,g1A hydraulic profile showing liquid levels in all compartments with both an
•-oiar,average:daily influent rate and a peak influent rate... r-- -
a '. €i 2..3,:fl.Complete installation instructions including anchor bolt layout, interconnect-
r'. v=sa -ing piping.details and mechanical,connections., ,., *;, -.
2.4. Control data.Data shall be provided that covers the following details
2.4.1. Approximate enclosure dimensions including height, width and
depth. feet ,.. t, -;'w,.ri ,, t f -
, s,= :, 2.4.2. :;.Maximum wire size(main terminal block or.disconnect p- device).
t -=
2.4.3. Air.circuit breaker data including: function, reference designator,
,;.:1:-.rrZ ..I +;NEMA size, service voltage,.phase, number of overload heaters, and coil
_:- _,;-= "-=. voltage, .1 ..a.,,, .•__ , t•I
-a Y: ;,fit a:TiZ•4,5,; .,Motor data shall include: function, horsepower, phase, frequency,
!It -:. voltage, approximate full load current, service factor, nominal RPM, frame
.. ..- . : 14,,tif i size, NEMA speed-torque design, and insulation class.
2.4.6. A control schematic diagram shall be provided that shows power and
=,tzr ;T rt;control circuits in sufficient detail to evaluate the control system design.
2.5. Performance data including, when applicable, blower curves, motor data,
, A,froth pump data and diffuser head loss data. - - ,
,.:,1 L :;;2.6.:irL4ll other information necessary to enable the Engineer to determine whether
;; 4 ;• the proposed equipment meets the specified requirements. ,
3. r DESIGN REQUIREMENTS " :ij
All components supplied shall conform to the size requirements as set forth in the
plans, to the.requirements included in other sections of this specification, and to the
0 following broad design parameters.
10-1-74

SPECIFICATION NO.PMC 1
Page Two
4. STRUCTURAL
4.1. Vertical steel interior bulkheads designated on the plans as hydrostatic and
all outer steel walls shall be structurally designed to withstand full hydrostatic
forces applied from either side of the bulkhead or wall. The design of the interior
hydrostatic bulkheads will be such that each isolated compartment may be
individually dewatered.The method used to initially fill the plant with liquid may be
selected by the Engineer to test the hydrostatic design.
4.2. The tanks shall be constructed of structural grade steel plate with exterior
reinforcing, and internal cross braces as required.
5. CLARIFIER
5.1. The clarifier shall be circular in'shape and shall include integral process
tanks as specified in the attached process specifications.
5.2. The clarifier bottom shall be steel and shall have a factory installed sludge
sump and sludge return line. The bottom shall be given final form at the factory by
placement of nonstructural lightweight concrete.
5.3. The clarifier effluent weir, weir trough and scum baffle shall be a polyester
compound reinforced with glass fibers. When completed the weir trough shall
require no caulking or sealant to prevent leakage. The weir, weir trough, and scum
baffle shall be adjustable over a minimum four (4) inch vertical range with all
adjustments requiring only small hand tools. The complete weir trough assembly
shall be completely removable without having to dewater the clarifier.
5.4. The sludge collector assembly shall consist of a rotating central torque tube
with steel sludge scraper arms attached. The scraper blades shall be adjustable
neoprene scrapers attached to the rotary scraper arms.The collector assembly shall
be completely removable without having to dewater the clarifier and shall include a
sludge stirrer for the clarifier sump. The entire collector assembly shall be factory
installed and adjusted and shall be supported from a self-aligning flange block
bearing accessible from the clarifier walkway. The drive mechanism shall have
positive shear pin protection from overload damage.
6. PLANT FABRICATION AND INSTALLATION
6.1. Each plant shall be prefabricated in the factory of the manufacturer and shall
be shipped complete with all necessary related equipment.
6.2. The structure shall consist of rectangular aeration tanks and a circular
settling tank. The principal items of equipment shall include aeration and process
tanks as specified in the attached process specifications, circular settling tank with
mechanical sludge collector and surface scum removal unit, inlet bar screen (when
required), duplex rotary positive blowers with motors and silencing, froth control
system, and central electrical control panel.
Available accessory equipment is listed in another section of these
specifications.
6.4. All work on the tanks and clarifier including welding, on-plant wiring,
interior piping, installation of equipment, and internal and external painting shall be
completed prior to shipment from the factory. Field installation shall entail placing
and anchoring each unit, making external piping and electrical connections,
touching up scuffed places with paint and setting the blowers, motors and control
panel and placement of diffuser drop pipes. When specified, additional components
including but no limited to chlorination equipment, comminutor, flow meter,
handrails and corrosion protection devices shall be field mounted and bolted in place
in accordance with the manufacturer's recommendations.
10-1-74

• SPECIFICATION NO. PMC1
Page Three
7. COMPONENT CONSTRUCTION
7.1. The treatment plant shall have a basic rectangular shape. This structure
shall include rectangular compartments and circular settling tank(s). All bulkheads
shall be factory installed. Larger plants may require multiple rectangular tanks.
These units will be coupled together at the job site by pipe connectors, and will
require no field welding.
8. WALKWAYS
All plant units shall be provided with nonskid industrial floor grating. All walkways
shall be an integral part of the unit.
9. BLOWERS
9.1. Each wastewater treatment plant shall be supplied with two rotary, positive
displacement blowers, mounted on the plant with a common base and a central
electric control panel, belt drive system, drip proof induction type electric motors,
necessary valves including a pressure relief valve and silencers as shown on the
plans. All piping and related equipment necessary to connect the blowers to the
plant air header shall be supplied by the plant manufacturer.
9.2. The plant manufacturer shall provide complete installation instructions for
the blower assembly and related piping.
10. AIR DIFFUSER SYSTEM
Where required, noncorrosive air diffusers shall be spaced approximately
twenty-four (24) inches apart and located along one wall of the rectangular tanks. The
diffuser drop pipes shall be one (1) inch minimum diameter and each assembly shall be
designed and installed so as to be removable for cleaning without disturbing the operation
of the plant.
11. INLET BAR SCREEN(When Required)
A removable inlet bar screen shall be mounted at the discharge point of the raw
wastewater influent pipe. This bar screen shall be accessible from the walkway for
cleaning purposes and shall have openings one (1) inch wide.
12. FROTH CONTROL SYSTEM
12.1. The plant manufacturer shall provide an effective froth control system for all
aeration tanks.The system shall consist of a single distribution header for each tank,
removable froth spray nozzles and a submersible pump.
12.2. The pump shall be a centrifugal submersible pump installed in the clarifier.
The pump shall be accessible from the clarifier walkway and shall be removable
without having to disturb other components of the clarifier. The pump shall be
capable of delivering to each spray nozzle in the system a minimum flow of 1.8 GPM
at 12 feet of head. The pump motor shall be single phase, 60 hertz, 115 volts, with
built-in thermal protection.
12.3. The froth spray nozzles shall be brass with a minimum opening of 3/16 inches.
All nozzles shall be removable and accessible from the plant walkway.
13. CORROSION PROTECTION
13.1. After completion of factory welding, all steel surfaces of each unit shall be
blasted to bare metal.
13.2. All metal surfaces shall be primed with an amine-cured epoxy primer
producing a minimum dry thickness of 11/2 mils. After a minimum eight-hour drying
10-1-74

SPECIFICATION NO.PMC1
Page Four
period, an amine adduct epoxy high-built resing shall be applied to produce a 6-mil
total dry thickness on all metal surfaces. The primer shall be red or orange in color
and the finish coat shall be as specified on the plans.
13.3. When cathodic protection is required and called for on the plans, a minimum
of two (2) 17-pouiig anodes shall be connected on opposite sides of each unit utilizing
a minimum 8-foot long insulated copper lead and copper lug connections. All anodes
shall be supplied by the plant manufacturer and installed in strict accordance with
the manufacturer's instructions.
14. ELECTRICAL CONTROLS
14.1. Principal Equipment
The control system shall include but not be limited to a 24-hour indicating
timer, interlock motor starter contacts for the froth pump and a sludge collector
manual starter. Design, fabrication and installation of all electrical components
shall be in accordance with the revision of the National Electrical Code that is
current at the time of award of contract.
14.2. NEC Design
The revision of the National Electrical Code that is current at the time the job
is submitted will be used to evaluate the submittal and for construction of the
approved design.
14.3. Controls
14.3.1. Enclosure
The control equipment shall be housed in a NEMA 3R painted steel
enclosure with a key holding "T"handle.
14.3.2. Circuit Breakers
The motor branch circuits shall be short circuit protected by thermal
magnetic air circuit breakers. The froth pump, sludge collector drive motor,
and the blower controls shall be protected by individual single phase thermal
magnetic air circuit breakers.
14.3.3. Motor Starters
A magnetic across-the-line starter with overload heaters in each
phase and a common trip contact set shall be provided for each pump motor to
give positive protection against single phasing.
14.3.4. Blower Manual Control
A hand-off-auto (HOA) switch shall be provided in the control panel
for each blower motor.
14.3.5. Blower Automatic Control
A 24-hour time clock will be provided that can be programmed by the
operator to automatically alternate the blower motors every two hours. The
time clock shall include a time-of-day indicator and shall be easily set by
hand.
14.3.6. Froth Pump Controls
The single phase 115 volts supplied to the froth pump shall be
interlocked with the blower motor starters such that the froth pump runs
when either or both blowers are running and is shut off when both blowers
are shut off. A grounded type 3-pronged connector in a weatherproof FS box
shall be provided near the froth pump.
14.3.7. Sludge Collector Drive Controls
A manual starter with integral thermal overload shall be provided on
the bridge to manually control the sludge collector drive motor.
10-1-74

SPECIFICATION NO. PMC1
Page Five
15. STARTUP AND OPERATING INSTRUCTIONS
15.1. The plant manufacturer shall provide detailed instructions conforming with the requirements of the Federal Environmental
Protec-
tion Agency as set forth in "Federaloperating and installation
Guidelines, Design Operation and Maintenance
of Wastewater Treatment Facilities"dated September, 1970. Each set
be prepared especially for the type of plant delivered, and all operating
shall refer only of books shall
to the particular plant. The manufacturer shall provide a minimum of
three bound sets of literature and one set of installation drawings instructions
delivered with the shipping papers for the plant.
15.2. The plant manufacturer shall provide the services of a trained which shall be
for a minimum period of one daypned representative
instruct the owner's operation personnel tin the operato perform tion maintenanceandtial and to adjust the equiorpment start-up of the plant, to
manufacturer's representative performing this serviceshall be a of the
satisfactory iso eshall after installation.mpyThe
the plant manufacturer, normally engaged in this t
direct employee of
16. WARRANTY type of service work.
16.1. The manufacturer of the wastewater treatment plant shall warrant
year from date of shipment that the plant and all related e
defects in design, for one
16.2. Warrantiesg and guarantees a
b manship. equipment will be free from
lieu of a single source responsibilityy the suppliers of various plant components in
The plant manufacturer shall be solely responsible for the warrantyof
by the plant manufacturer will not be accepted.
all related components.
16.3. In the event a component fails to perform as specified or is the plant and
service during the warranty period, excluding items of supply
duringoperation, proven defective in
the manufacturer shall provide a replacemen part itthoutc o
the owner. normally expended
16.4. This warrantyecost to
operated under normal shallconditionvalis and accor the dance
is properly serviced and
instructions. with the manufacturer's
17. EQUIPMENT MANUFACTURER
17.1. In order to establish a standard of quality and to insure a uniform
bidding each wastewater treatment plant furnished shall be a steel
fabri-
cated plant as manufactured by basis of
Thomasville, Georgia, or an approved
div.,Davis Water and Waste Indaustries ctory Inc ,
17.2. To be considered an approved equal.
must be be t the a approved equal, complete details and shop
drawings
Engineer no later than seven (7) days prior to the bid date.
available to determine that the alternate plant meets the required specifications.
17.3. the required information
The equipment specified herein shall be the product of a manufacturer
a minimum of 10P cifications.
yearsn experience in the construction of prefabricated wastewater
Pumping and treatment eqexperience
having
In lieu of.the 10 years experience
5-year cash orperformance bond in the amount of 100�
Y , any manufacturer may bid provided a
to the owner. �o of the bid price is provided
17.4. The contractor shall prepare his bid on the basis of the specified
and materials specified for purposes of determining the low bid. After
the contract, substitution of e equipment
considered if the substitution is,equipment other makes than that specified will be
Pinion of the Engineer, equal in quality to

SPECIFICATION NO.PMC1
Page Six
that named.If such substitution is approved by the Engineer, all savings effected by
the Contractor in the purchase of the substituted equipment shall be passed on to the
owner by reducing the contract price. .
•
10-1-74

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SPECIFICATION NO.PMC1.
0 k.
.j •- .;){'S_ :Y".iltt41+if-ii.ti. ., •i 31,t i 3F.=i ci:,• ...� i,:iiin.: ;4'..
t: -.a ':;; s`,f i •r -A ^ ..SUGGESTED EQUIPMENT SPECIFICATION.. ",
- _ i,i-e-`: :,, MECHANICAL COLLECTOR .
fl; :i; , 6j. WASTEWATER TREATMENT T PLANT
'' ` , ..,IPACKAGE]; i i :al, _ '
t.
i' 1-ai-i;�ix:) �,.tkw `ei.li:y' :Eil tti, `'i':a- F-•`.s').u :irsi`t t2 i- t,.. -._ ... .-.14.: ''- .1. GENERAL •`
The contractor shall provide and install each factory fabricated wastewater
treatment plant complete with connecting piping and appurtenant.work.as detailed on the
drawings and specified herein-The plant shall be as manufactured by Davco div.,.Davis
Water&Waste.Industries,,Inc., Thomasville, or an,approved equal.
yr' 'i:_ .1, i•Vli to "1;o71 !a't i. i,i:i .1" -,ciCl .4r T ". . .i'..-
rf„
- 2,..:*:,,SHOP DRAWINGS . 3:::1_ t ,. , ,;... :4. :•'''. , • . -
- 1:! - P. The contractor shall submit a minimum of six (6) copies of all shop drawings to the
x" Engineer for.approval. Of these, two (2) copies will be returned to the contractor with
appropriate action taken. Receipt of less than the minimum required number of copies will
g, be cause for withholding the shop.drawings from being checked until receipt of the
necessary additional copies. , i,.i ; ;.• , . 4L!s.ltsS.'Y['J, 1 -
` ::.:;a. Each set of shop drawings shall include but not necessarily be limited to: ..
:.i .- 2.
i 1. ,Drawings showing dimensions of all steel un tq•including dimensions of all
i
`/ L.sstC 'compartments u.r ,.:': ti $., 1. . . _'ir x) "It2#s;- :q�
t,f�;4--.
V: 4 ,i.t 22Ie A hydraulic,profile showing liquid levels in all,compartments with both an
7_, 1o ,average daily influent rate and a peak influent rate..:.r-- f+
".nt. 2;.3... Complete installation instructions including anchor bolt layout, interconnect-
.:- ,
1'v4 ing piping details and mechanical connections., -, .
2.4. Control data.Data shall be provided that covers the following details:
2.4.1. Approximate enclosure dimensions including height, width and
1 depth. it1_-:•‘,.. i I- A ;':': ,Ii,rt
,;-, r_ :.-; 2.4.2. . Maximum wire size(main terminal block or disconnect device).
2.4.3. Air,circuit breaker data including: function, reference designator,
3; :a ENEMA size,_service voltage..,phase, number of overload heaters, and coil
_ r :,;: i s, voltage._ ;,,:. .tea , ,i•, .. ,E, _.,,. .- .:� r ; . .,
x . ,.et j,.2.4.5. Motor data shall;include::function, horsepower, phase, frequency,
:•.:voltage, approximate full load current, service factor, nominal RPM, frame
:i size, NEMA speed-torque design, and insulation class.
2.4.6. A control schematic diagram shall be provided that shows power and
”t:_,r, lc; il,,control circuits in sufficient detail to evaluate the control system design.
2.5. Performance data including, when applicable, blower curves, motor data,
sa.;;froth pump data and.diffuser.head loss data. , . _
, f If ;,;2.6,i,.All other information necessary to enable the Engineer to determine whether
; : the proposed equipment meets the specified requirements. ; , ,
3. DESIGN REQUIREMENTS ..
,.All components supplied shall conform to the size requirements as set forth in the
" -— plans,. to 'the:requirements included in other sections of this specification, and to the
following broad design parameters.
•
10-1-74

SPECIFICATION NO.PMC 1
Page Two
4. STRUCTURAL
4.1. Vertical steel interior bulkheads designated on the plans as hydrostatic and
• all outer steel walls shall be structurally designed to withstand full hydrostatic
forces applied from either side of the bulkhead or wall. The design of the interior
hydrostatic bulkheads will be such that each isolated compartment may be
individually dewatered.The method used to initially fill the plant with liquid may be
selected by the Engineer to test the hydrostatic design.
4.2. The tanks shall be constructed of structural grade steel plate with exterior
reinforcing, and internal cross braces as required.
5. CLARIFIER
5.1. The clarifier shall be circular in shape and shall include integral process
tanks as specified in the attached process specifications.
5.2. The clarifier bottom shall be steel and shall have a factory installed sludge
sump and sludge return line. The bottom shall be given final form at the factory by
placement of nonstructural lightweight concrete.
5.3. The clarifier effluent weir, weir trough and scum baffle shall be a polyester
compound reinforced with glass fibers. When completed the weir trough shall
require no caulking or sealant to prevent leakage. The weir, weir trough, and scum
baffle shall he adjustable over a minimum four (4) inch vertical range with all
adjustments requiring only small hand tools. The complete weir trough assembly
shall be completely removable without having to dewater the clarifier.
5.4. The sludge collector assembly shall consist of a rotating central torque tube
with steel sludge scraper arms attached. The scraper blades shall be adjustable
neoprene scrapers attached to the rotary scraper arms.The collector assembly shall
be completely removable without having to dewater the clarifier and shall include a
sludge stirrer for the clarifier sump. The entire collector assembly shall be factory
installed and adjusted and shall be supported from a self-aligning flange block
bearing accessible from the clarifier walkway. The drive mechanism shall have
positive shear pin protection from overload damage.
6. PLANT FABRICATION AND INSTALLATION
6.1. Each plant shall be prefabricated in the factory of the manufacturer and shall
be shipped complete with all necessary related equipment.
6.2. The structure shall consist of rectangular aeration tanks and a circular
settling tank. The principal items of equipment shall include aeration and process
tanks as specified in the attached process specifications, circular settling tank with
mechanical sludge collector and surface scum removal unit, inlet bar screen (when
required), duplex rotary positive blowers with motors and silencing, froth control
system, and central electrical control panel.
Available accessory equipment is listed in another section of these
specifications.
6.4. All work on the tanks and clarifier including welding, on-plant wiring,
interior piping, installation of equipment, and internal and external painting shall be
completed prior to shipment from the factory. Field installation shall entail placing
and anchoring each unit, making external piping and electrical connections,
• touching up scuffed places with paint and setting the blowers, motors and control
panel and placement of diffuser drop pipes. When specified, additional components
including but no limited to chlorination equipment, comminutor, flow meter,
handrails and corrosion protection devices shall be field mounted and bolted in place
in accordance with the manufacturer's recommendations.
10-1-74

SPECIFICATION NO. PMC1
Page Three
7. COMPONENT CONSTRUCTION
7.1. The treatment plant shall have a basic rectangular shape. This structure
shall include rectangular compartments and circular settling tank(s). All bulkheads
shall be factory installed. Larger plants may require multiple rectangular tanks.
These units will be coupled together at the job site by pipe connectors, and will
require no field welding.
8. WALKWAYS
All plant units shall be provided with nonskid industrial floor grating. All walkways
shall be an integral part of the unit.
9. BLOWERS
9.1. Each wastewater treatment plant shall be supplied with two rotary, positive
displacement blowers, mounted on the plant with a common base and a central
electric control panel, belt drive system, drip proof induction type electric motors.
necessary valves including a pressure relief valve and silencers as shown on the
plans. All piping and related equipment necessary to connect the blowers to the
plant air header shall be supplied by the plant manufacturer.
9.2. The plant manufacturer shall provide complete installation instructions for
the blower assembly and related piping.
10. AIR DIFFUSER SYSTEM
Where required, noncorrosive air diffusers shall be spaced approximately
twenty-four (24) inches apart and located along one wall of the rectangular tanks. The
diffuser drop pipes shall be one (1) inch minimum diameter and each assembly shall be
designed and installed so as to be removable for cleaning without disturbing the operation
of the plant.
11. INLET BAR SCREEN(When Required)
A removable inlet bar screen shall be mounted at the discharge point of the raw
wastewater influent pipe. This bar screen shall be accessible from the walkway for
cleaning purposes and shall have openings one(1) inch wide.
12. FROTH CONTROL SYSTEM
12.1. The plant manufacturer shall provide an effective froth control system for all
aeration tanks.The system shall consist of a single distribution header for each tank,
removable froth spray nozzles and a submersible pump.
12.2. The pump shall be a centrifugal submersible pump installed in the clarifier.
The pump shall be accessible from the clarifier walkway and shall be removable
without having to disturb other components of the clarifier. The pump shall be
capable of delivering to each spray nozzle in the system a minimum flow of 1.8 GPM
at 12 feet of head. The pump motor shall be single phase, 60 hertz, 115 volts, with
built-in thermal protection.
12.3. The froth spray nozzles shall be brass with a minimum opening of 3/16 inches.
All nozzles shall be removable and accessible from the plant walkway.
13. CORROSION PROTECTION
13.1. After completion of factory welding, all steel surfaces of each unit shall be
blasted to bare metal.
13.2. All metal surfaces shall be primed with an amine-cured epoxy primer
producing a minimum dry thickness of 1 1 mils. After a minimum eight-hour drying
10-1-74

SPECIFICATION NO.PMC1
Page Four
period, an amine adduct epoxy high-built resing shall be applied to produce a 6-mil
total dry thickness on all metal surfaces. The primer shall be red or orange in color
and the finish coat shall be as specified on the plans.
13.3. When cathodic protection is required and called for on the plans, a minimum
of two(2) 17-poung anodes shall be connected on opposite sides of each unit utilizing
a minimum 8-foot long insulated copper lead and copper lug connections. All anodes
shall be supplied by the plant manufacturer and installed in strict accordance with
the manufacturer's instructions.
14. ELECTRICAL CONTROLS
14.1. Principal Equipment
The control system shall include but not be limited to a 24-hour indicating
timer, interlock motor starter contacts for the froth pump and a sludge collector
manual starter. Design, fabrication and installation of all electrical components
shall be in accordance with the revision of the National Electrical Code that is
current at the time of award of contract.
14.2. NEC Design
The revision of the National Electrical Code that is current at the time the job
is submitted will be used to evaluate the submittal and for construction of the
approved design.
14.3. Controls
14.3.1. Enclosure
The control equipment shall be housed in a NEMA 3R painted steel
enclosure with a key holding "T"handle.
14.3.2. Circuit Breakers
The motor branch circuits shall be short circuit protected by thermal
magnetic air circuit breakers. The froth pump, sludge collector drive motor,
and the blower controls shall be protected by individual single phase thermal
magnetic air circuit breakers.
14.3.3. Motor Starters
A magnetic across-the-line starter with overload heaters in each
phase and a common trip contact set shall be provided for each pump motor to
give positive protection against single phasing.
14.3.4. Blower Manual Control
A hand-off-auto (HOA) switch shall be provided in the control panel
for each blower motor.
14.3.5. Blower Automatic Control
A 24-hour time clock will be provided that can be programmed by the
operator to automatically alternate the blower motors every two hours. The
time clock shall include a time-of-day indicator and shall be easily set by
hand.
14.3.6. Froth Pump Controls
The single phase 115 volts supplied to the froth pump shall be
interlocked with the blower motor starters such that the froth pump runs
when either or both blowers are running and is shut off when both blowers
are shut off. A grounded type 3-pronged connector in a weatherproof FS box
shall be provided near the froth pump.
14.3.7. Sludge Collector Drive Controls
A manual starter with integral thermal overload shall be provided on
the bridge to manually control the sludge collector drive motor.
10-1-74

SPECIFICATION NO. PMC1
Page Five
15. START-UP AND OPERATING INSTRUCTIONS
15.1. The plant manufacturer shall provide detailed operating and installation
instructions conforming with the requirements of the Federal Environment
al Protec-
tion Agency as set forth in
of Wastewater Treatment Facilities"dated SepteGuidelines, mber, 1970.n 0 Opeh set ration and ofbokshall
Maintenance
be prepared especially for the type of plant delivered, and all operating instructions
books shall
shall refer only to the particular plant. The manufacturer shall provide a
three bound sets of literature and one set of installation drawings whichshall be
delivered with the shippingpminimum of
pers for the plant.
15.2. The plant manufacturer shall provide the services of a shall be
for a minimum period of one day per plant to perform initial start-up
instruct the owner's operation personnel in the operation trained representative
the
plant and to adjust the equipment of the plant, to
q pment for satisfactory operation afterinstallation.ofintenance The
manufacturer's representative performing this service shall be a
direct employee of
the plant manufacturer, normally engaged inthis type of service work.
16. WARRANTY
16.1. The manufacturer of the wastewater treatment plant shall warrant
year from date of shipment that the plant and all related equipment will be
defects in design, for one
g material and workmanship. free from
16.2. Warranties and guarantees by the suppliers of various plant components
lieu of a single source responsibility by the plant manufacturer will not
The plant manufacturer shall be solely responsible for the warrantyof theplanta
all related components. be accepted.
16.3. In the event a component fails to perform as specified or is proven
and
• service during the warranty period, excluding items of supply normally expended
during operation, the manufacturer shall provide a replacement part
en defective in
the owner. p t without cost to
16.4. This warranty shall be valid only• if the product is inaccordance with properly serviced and
operated under normal conditions
manufacturer's
17. EQUIPMENT MANUFACTURER
17.1. In order to establish a standard of quality and to insure a
bidding each wastewater treatment plant furnished shall be a steel, fa
fabri-
cated plant as manufactured by Davco div., Davis Water and Waste uniform basis of
Thomasville, Georgia, or an approvedfactory 17.2. To be considered an a equal. Industries, Inc.,
must be submitted to the Engineer no later than complete details and shop
Sufficient data must be submitted so that the Engineer has the required drawings
available to determine that the alternate plant meets (7) days prior to the bid date.
17.3. The e the required specifications.informatin
equipment specified herein shall be the product of a manufacturer having
a minimum of 10 years experience in the construction of prefabricated
pumping and treatment equipment.
In lieu of the 10 wastewater
ovided a
5-year cash the 10 performance bondsexperience,
perience, any manufacturer may
to the owner. the amount of 100% of the bid price isid rprovided
17.4. The contractor shall prepare his bid on the basis of the specified
and materials specified for purposes of determining
the contract, substitution of equipment of other makes than that equipment
ied
considered if the substitution is, in the o the low bid. After execution of
opinion n of the Engineer, equal in quality will be
to

SPECIFICATION NO.PMC1
Page Six
that named.If such substitution is approved by the Engineer, all savings effected by
the Contractor in the purchase of the substituted equipment shall be passed on to the
owner by reducing the contract price.
10-1-74

i
j.
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BILL. OF MATERIAL BILL OF MATERIAL BILL OF MATERIAL
NW PART NO. DESCRIPTION QUANTITY CK NW NART NO. DESCRIPTION MU QUANTITY CK ITEM M NO. DESCRIPTION QUANTITY CK
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SECTION A-A DONOR
-_- TITS oWr1 Ft aKGr DATE DY/c 1n
Its IT SEPT TI

SPECIFICATION NO.PMC1
Li
SUGGESTED EQUIPMENT SPECIFICATION ,-
MECHANICAL COLLECTOR
WASTEWATER TREATMENT pLANT
, [PACKAGE]
1. GENERAL '
The contractor shall provide and install each factory fabricated wastewater
treatment plant complete with connecting piping and appurtenant work as detailed on the
drawings and specified herein. The plant shall be as manufactured by Davco div., Davis
Water & Waste Industries, Inc., Thomasville, Georgia, or an.approved equal.
•
2. SHOP DRAWINGS •
The contractor shall submit a minimum of six (6) copies of all shop drawings to the
Engineer for.approval. Of these, two (2) copies will be returned to the contractor with
appropriate action taken. Receipt of less than the minimum required number of copies will
be cause for withholding the shop drawings from being checked until receipt of the
• necessary additional copies.
Each set of shop drawings shall include but not necessarily be limited to:
2.1. Drawings showing dimensions of all steel units including dimensions of all
compartments.:,.
4/ •
LK/ • 2.2. A hydraulic profile showing liquid levels in all compartments with both an
average daily influent rate and a peak influent rate. ..
2,3.. Complete installation instructions including anchor bolt layout, interconnect-
ing piping details and mechanical connections. • .
2.4. Control data.Data shall be provided that covers the following details:
2.4.1. Approximate enclosure dimensions including height, width and
• depth.
2.4.2. Maximum wire size(main terminal block or disconnect device).
2.4.3. Air.circuit breaker data including: function, reference designator,
.NEMA size, service voltage, phase, number of overload heaters, and coil
voltage. • . • . , , ,
2.4.5. Motor data shall include: function, horsepower, phase, frequency,
voltage, approximate full load current, service factor, nominal RPM, frame
• size, NEMA speed-torque design, and insulation class.
2.4.6. A control schematic diagram shall be provided that shows power and
control circuits in sufficient detail to evaluate the control system design.
2.5. Performance data including, when applicable, blower curves, motor data,
froth pump data and diffuser head loss data.
2.6. All other information necessary to enable the Engineer to determine whether
the proposed equipment meets the specified requirements.
3. . DESIGN REQUIREMENTS
All components supplied shall conform to the size requirements as set forth in the
plans, to the requirements included in other sections of this specification, and to the
following broad design parameters.
10-1-74

SPECIFICATION NO. PMC 1
Page Two
4. STRUCTURAL
4.1. Vertical steel interior bulkheads designated on the plans as hydrostatic and
all outer steel walls shall be structurally designed to withstand full hydrostatic
forces applied from either side of the bulkhead or wall. The design of the interior
hydrostatic bulkheads will be such that each isolated compartment may be
individually dewatered.The method used to initially fill the plant with liquid may be
selected by the Engineer to test the hydrostatic design.
4.2. The tanks shall be constructed of structural grade steel plate with exterior
reinforcing, and internal cross braces as required.
5. CLARIFIER
5.1. The clarifier shall be circular in'shape and shall include integral process
tanks as specified in the attached process specifications.
5.2. The clarifier bottom shall be steel and shall have a factory installed sludge
sump and sludge return line. The bottom shall be given final form at the factory by
placement of nonstructural lightweight concrete.
5.3. The clarifier effluent weir, weir trough and scum baffle shall be a polyester
compound reinforced with glass fibers. When completed the weir trough shall
require no caulking or sealant to prevent leakage. The weir, weir trough, and scum
baffle shall he adjustable over a minimum four (4) inch vertical range with all
adjustments requiring only small hand tools. The complete weir trough assembly
shall be completely removable without having to dewater the clarifier.
5.4. The sludge collector assembly shall consist of a rotating central torque tube
with steel sludge scraper arms attached. The scraper blades shall be adjustable
neoprene scrapers attached to the rotary scraper arms.The collector assembly shall
be completely removable without having to dewater the clarifier and shall include a
sludge stirrer for the clarifier sump. The entire collector assembly shall be factory
installed and adjusted and shall be supported from a self-aligning flange block
bearing accessible from the clarifier walkway. The drive mechanism shall have
positive shear pin protection from overload damage.
6. PLANT FABRICATION AND INSTALLATION
6.1. Each plant shall be prefabricated in the factory of the manufacturer and shall
be shipped complete with all necessary related equipment.
6.2. The structure shall consist of rectangular aeration tanks and a circular
settling tank. The principal items of equipment shall include aeration and process
tanks as specified in the attached process specifications, circular settling tank with
mechanical sludge collector and surface scum removal unit, inlet bar screen (when
required), duplex rotary positive blowers with motors and silencing, froth control
system, and central electrical control panel.
Available accessory equipment is listed in another section of these
specifications.
6.4. All work on the tanks and clarifier including welding, on-plant wiring,
interior piping, installation of equipment, and internal and external painting shall be
completed prior to shipment from the factory. Field installation shall entail placing
and anchoring each unit, making external piping and electrical connections,
touching up scuffed places with paint and setting the blowers, motors and control
panel and placement of diffuser drop pipes. When specified, additional components
including but no limited to chlorination equipment, comminutor, flow meter,
handrails and corrosion protection devices shall be field mounted and bolted in place
in accordance with the manufacturer's recommendations.
10-1-74

SPECIFICATION NO. PMC1
Page Three
�-- 7. COMPONENT CONSTRUCTION
7.1. The treatment plant shall have a basic rectangular shape. This structure
shall include rectangular compartments and circular settling tank(s). All bulkheads
shall be factory installed. Larger plants may require multiple rectangular tanks.
These units will be coupled together at the job site by pipe connectors, and will
require no field welding.
8. WALKWAYS
All plant units shall be provided with nonskid industrial floor grating. All walkways
shall be an integral part of the unit.
9. BLOWERS
9.1. Each wastewater treatment plant shall be supplied with two rotary, positive
displacement blowers, mounted on the plant with a common base and a central
electric control panel, belt drive system, drip proof induction type electric motors,
necessary valves including a pressure relief valve and silencers as shown on the
plans. All piping and related equipment necessary to connect the blowers to the
plant air header shall be supplied by the plant manufacturer.
9.2. The plant manufacturer shall provide complete installation instructions for
the blower assembly and related piping.
10. AIR DIFFUSER SYSTEM
Where required, noncorrosive air diffusers shall be spaced approximately
twenty-four (24) inches apart and located along one wall of the rectangular tanks. The
diffuser drop pipes shall be one (1) inch minimum diameter and each assembly shall be
designed and installed so as to be removable for cleaning without disturbing the operation
of the plant.
11. INLET BAR SCREEN(When Required)
A removable inlet bar screen shall be mounted at the discharge point of the raw
wastewater influent pipe. This bar screen shall be accessible from the walkway for
cleaning purposes and shall have openings one(1) inch wide.
12. FROTH CONTROL SYSTEM
12.1. The plant manufacturer shall provide an effective froth control system for all
aeration tanks. The system shall consist of a single distribution header for each tank,
removable froth spray nozzles and a submersible pump.
12.2. The pump shall be a centrifugal submersible pump installed in the clarifier.
The pump shall be accessible from the clarifier walkway and shall be removable
without having to disturb other components of the clarifier. The pump shall be
capable of delivering to each spray nozzle in the system a minimum flow of 1.8 GPM
at 12 feet of head. The pump motor shall be single phase, 60 hertz, 115 volts, with
built-in thermal protection.
12.3. The froth spray nozzles shall be brass with a minimum opening of 3/16 inches.
All nozzles shall be removable and accessible from the plant walkway.
13. CORROSION PROTECTION
13.1. After completion of factory welding, all steel surfaces of each unit shall be
blasted to bare metal.
13.2. All metal surfaces shall be primed with an amine-cured epoxy primer
producing a minimum dry thickness of 11/2 mils. After a minimum eight-hour drying
10-1-74

SPECIFICATION NO. PMC1
Page Four
period, an amine adduct epoxy high-built resing shall be applied to produce a 6-mil
total dry thickness on all metal surfaces. The primer shall be red or orange in color
and the finish coat shall be as specified on the plans.
13.3. When cathodic protection is required and called for on the plans, a minimum
of two(2) 17-poung anodes shall be connected on opposite sides of each unit utilizing
a minimum 8-foot long insulated copper lead and copper lug connections. All anodes
shall be supplied by the plant manufacturer and installed in strict accordance with
the manufacturer's instructions.
14. ELECTRICAL CONTROLS
14.1. Principal Equipment
The control system shall include but not be limited to a 24-hour indicating
timer, interlock motor starter contacts for the froth pump and a sludge collector
manual starter. Design, fabrication and installation of all electrical components
shall be in accordance with the revision of the National Electrical Code that is
current at the time of award of contract.
14.2. NEC Design
The revision of the National Electrical Code that is current at the time the job
is submitted will be used to evaluate the submittal and for construction of the
approved design.
14.3. Controls
14.3.1. Enclosure
The control equipment shall be housed in a NEMA 3R painted steel
enclosure with a key holding "T"handle.
14.3.2. Circuit Breakers
The motor branch circuits shall be short circuit protected by thermal
magnetic air circuit breakers. The froth pump, sludge collector drive motor,
and the blower controls shall be protected by individual single phase thermal
magnetic air circuit breakers.
14.3.3. Motor Starters
A magnetic across-the-line starter with overload heaters in each
phase and a common trip contact set shall be provided for each pump motor to
give positive protection against single phasing.
14.3.4. Blower Manual Control
A hand-off-auto (HOA) switch shall be provided in the control panel
for each blower motor.
14.3.5. Blower Automatic Control
A 24-hour time clock will be provided that can be programmed by the
operator to automatically alternate the blower motors every two hours. The
time clock shall include a time-of-day indicator and shall be easily set by
hand.
14.3.6. Froth Pump Controls
The single phase 115 volts supplied to the froth pump shall be
interlocked with the blower motor starters such that the froth pump runs
when either or both blowers are running and is shut off when both blowers
are shut off. A grounded type 3-pronged connector in a weatherproof FS box
shall be provided near the froth pump.
14.3.7. Sludge Collector Drive Controls
A manual starter with integral thermal overload shall be provided on
the bridge to manually control the sludge collector drive motor.
10-1-74

SPECIFICATION NO. PMC1
Page Five
15. START-UP AND OPERATING INSTRUCTIONS
15.1. The
plant manufacturer shall provide detailed operating
instructions conforming with the requirements of the Federal Environmental
tion Agency as set forth in "Federal Guidelines, Design Operation and installation
of Wastewater Treatment Facilities"dated September, 1970. Each se sP shall
-
be prepared especially for the typeand Maintenance
• shall refer only of plant delivered, and all o t operating
books shall
to the particular plant. The manufacturer shall provide a minimum of
three bound sets of literature and one set of installation drawingserating instructions
delivered with the shipping papers for the plant.
15.2. The plant manufacturer shall provide the services of a trained
which shall be
for a minimum period of one day per plant to perform initial start-up
instruct the owner's operationed representative
in p of the plant, to
plant and to adjust the equipment for nsatisfactor e operation and maintenance of the
manufacturer's representative performing this service shall be a direct
Y operation after installation. The
the plant manufacturer, normally engaged in this type of service work.
employee of
16. WARRANTY
16.1. The manufacturer of the wastewater treatment plant shall warrant
year from date of shipment that the plant and all related equipment will
defects in design, for one
16.2. Warranties and guaraantees by
be free from
lieu of a single source guaranteresponsibilityby the suppliers of various plant components in
The plant manufacturer shall be solely responsible for the warranty
Y the plant manufacturer will not be accepted.
all related components.
16.3. In the event a component fails to perform as specified or is of the plant and
service during the warranty period, excluding items of supply
during operation, the manufacturer shall provide a replacement proven defective in
the owner. PP Y normally expended
16.4. This warranty shall be valid onlyifp part without cost to
opeteoperated under normal conditions and accordancet with the manufacturer's
du instructions. is properly nufac to and
facturer's
17. EQUIPMENT MANUFACTURER
17.1. In order to establish a standard of quality and to insure a uniform
bidding each wastewater treatment plant furnished shall be a steel,
fabri-
cated plant as manufactured by Davco div., Davis Water and Waste In basis of
Thomasville, factory Georgia, or an approved equal. Industries, Inc.,
17.2. To be considered an approved equal, complete details and shop
must be submitted to the Engineer no later than seven (7)data must be submitted so that the Engineer has the required drawings
available to determine that the alternate plant meets days prior to the bid date.
17.3. The ee information
equipment specified herein shall be the product of arequma manufacired turer specifications.i
a minimum of 10 years experience in the construction of prefabricated
pumping and treatment equipment.
having
In lieu of the 10 q Pment. wastewater
5-year cash years experience, any manufacturer may
to the owner. performance bond in the amount of 100% of the bid price iid s pro idea
17.4. The contractor shall prepare his bid on the basis of thespecifiedd
and materials specified for purposes of determining
the contract, substitution of equipment of other makes than equipment
consideredtra if the substitution is,q inp the o the low bid. Afterat s execution be
pinion of the Engineer,h equal ini quality o

SPECIFICATION NO. PMC1
Page Six
that named. If such substitution is approved by the Engineer, all savings effected by
the Contractor in the purchase of the substituted equipment shall be passed on to the
owner by reducing the contract price. .
•
10-1-74

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SECTION A-A .ONES
1MU D.N e, DIP/ MR IwKID
OVA I IT SEPT 74

•
• SPECIFICATION NO.PMC1
• .
• : • g
• ,„ - SUGGESTED EQUIPMENT SPECIFICATION •
_
MECHANICAL COLLECTOR
: • b , .WASTEWATER TREATMENT PLANT
),. [PACKAGE], =it .. • •
; 'N :A
1. GENELAI.
The contractor shall provide and install each factory fabricated wastewater
treatment plant complete with connecting piping and appurtenant work as detailed on the
drawings and specified herein. The plant shall be as manufactured by Davco div., Davis
Water & Waste Industries, Inc., Thomasville, Georgia, or an.approved equal.
-‘• .- :,:c , • •,.
. •
2. :E. SHOP DRAWINGS •
• The contractor shall submit a minimum of six (6) copies of all shop drawings to the
Engineer for.approval. Of these, two (2) copies will be returned to the contractor with
appropriate,action taken. Receipt of less than the minimum required number of copies will
t e-- be:cause for' withholding the shop.drawings from._being checked until receipt of the
necessary additional copies._
:Yj:T; -rEach set of shop drawings shall include but not necessarily be limited to:
:,.Drawings showing dimensions of all steel unit including dimensions of all
,compartments,th: : • 3 ,
Lo) A hydraulic profile showing liquid levels in all compartments with both an
- -raverage daily influent rate and a peak influent rate.:,: •
23 Complete installation instructions including anchor bolt layout, interconnect-
ing piping details and mechanicalconnections, • ,
2.4. Control data.Data shall be provided that covers the following details: •
2.4.1. Approximate enclosure dimensions including height, width and
depth.
WA:17V._)J,6 $41
2.4.2.. Maximum wire size(main terminal block or disconnect device).
2.4.3. Air circuit breaker data including: function, reference designator,
,size;_service voltage, phase, number of overload heaters, and coil
yoltage., frift tn• ' "7:
• ; :i2e) 43,2.4.5., _Motor data shall include: function, horsepower, phase, frequency,
voltage, approximate,full load current, service factor, nominal RPM, frame
size, NEMA speed-torque design, and insulation class.
2.4.6. A control schematic diagram shall be provided that shows power and
,,,.control circuits in sufficient detail to evaluate the control system design.
2.5. Performance data including, when applicable, blower curves, motor data,
, •,froth pump data and diffuser head loss data.
2.6.r All other information necessary to enable the Engineer to determine whether
the proposed equipment meets the specified requirements.
1.-.1;••• ,
• • :
3. DESIGN REQUIREMENTS _
All components supplied shall conform to the size requirements as set forth in the
' - plans, to the.requirements included in other sectionsof this specification, and to the
.
following broad design parameters.
•
10-1-74
•

SPECIFICATION NO. PMC 1
Page Two
4. STRUCTURAL
4.1. Vertical steel interior bulkheads designated on the plans as hydrostatic and
all outer steel walls shall be structurally designed to withstand full hydrostatic
forces applied from either side of the bulkhead or wall. The design of the interior
hydrostatic bulkheads will be such that each isolated compartment may be
individually dewatered.The method used to initially fill the plant with liquid may be
selected by the Engineer to test the hydrostatic design.
4.2. The tanks shall be constructed of structural grade steel plate with exterior
reinforcing, and internal cross braces as required.
5. CLARIFIER
5.1. The clarifier shall be circular in.shape and shall include integral process
tanks as specified in the attached process specifications.
5.2. The clarifier bottom shall be steel and shall have a factory installed sludge
sump and sludge return line. The bottom shall be given final form at the factory by
placement of nonstructural lightweight concrete.
5.3. The clarifier effluent weir, weir trough and scum baffle shall be a polyester
compound reinforced with glass fibers. When completed the weir trough shall
require no caulking or sealant to prevent leakage. The weir, weir trough, and scum
baffle shall he adjustable over a minimum four (4) inch vertical range with all
adjustments requiring only small hand tools. The complete weir trough assembly
shall be completely removable without having to dewater the clarifier.
5.4. The sludge collector assembly shall consist of a rotating central torque tube
with steel sludge scraper arms attached. The scraper blades shall be adjustable
neoprene scrapers attached to the rotary scraper arms.The collector assembly shall
be completely removable without having to dewater the clarifier and shall include a
sludge stirrer for the clarifier sump. The entire collector assembly shall be factory
installed and adjusted and shall be supported from a self-aligning flange block
bearing accessible from the clarifier walkway. The drive mechanism shall have
positive shear pin protection from overload damage.
6. PLANT FABRICATION AND INSTALLATION
6.1. Each plant shall be prefabricated in the factory of the manufacturer and shall
be shipped complete with all necessary related equipment.
6.2. The structure shall consist of rectangular aeration tanks and a circular
settling tank. The principal items of equipment shall include aeration and process
tanks as specified in the attached process specifications, circular settling tank with
mechanical sludge collector and surface scum removal unit, inlet bar screen (when
required), duplex rotary positive blowers with motors and silencing, froth control
system, and central electrical control panel.
Available accessory equipment is listed in another section of these
specifications.
6.4. All work on the tanks and clarifier including welding, on-plant wiring,
interior piping, installation of equipment, and internal and external painting shall be
completed prior to shipment from the factory. Field installation shall entail placing
and anchoring each unit, making external piping and electrical connections,
touching up scuffed places with paint and setting the blowers, motors and control
panel and placement of diffuser drop pipes. When specified, additional components
including but no limited to chlorination equipment, comminutor, flow meter,
handrails and corrosion protection devices shall be field mounted and bolted in place
in accordance with the manufacturer's recommendations.
10-1-74

SPECIFICATION NO.PMC1
Page Three
7. COMPONENT CONSTRUCTION
7.1. The treatment plant shall have a basic rectangular shape. This structure
shall include rectangular compartments and circular settling tank(s). All bulkheads
shall be factory installed. Larger plants may require multiple rectangular tanks.
These units will be coupled together at the job site by pipe connectors, and will
require no field welding.
8. WALKWAYS
All plant units shall be provided with nonskid industrial floor grating. All walkways
shall be an integral part of the unit.
9. BLOWERS
9.1. Each wastewater treatment plant shall be supplied with two rotary, positive
displacement blowers, mounted on the plant with a common base and a central
electric control panel, belt drive system, drip proof induction type electric motors,
necessary valves including a pressure relief valve and silencers as shown on the
plans. All piping and related equipment necessary to connect the blowers to the
plant air header shall be supplied by the plant manufacturer.
9.2. The plant manufacturer shall provide complete installation instructions for
the blower assembly and related piping.
10. AIR DIFFUSER SYSTEM
Where required, noncorrosive air diffusers shall be spaced approximately
twenty-four (24) inches apart and located along one wall of the rectangular tanks. The
diffuser drop pipes shall be one (1) inch minimum diameter and each assembly shall be
designed and installed so as to be removable for cleaning without disturbing the operation
of the plant.
11. INLET BAR SCREEN(When Required)
A removable inlet bar screen shall be mounted at the discharge point of the raw
wastewater influent pipe. This bar screen shall be accessible from the walkway for
cleaning purposes and shall have openings one(1) inch wide.
12. FROTH CONTROL SYSTEM
12.1. The plant manufacturer shall provide an effective froth control system for all
aeration tanks.The system shall consist of a single distribution header for each tank,
removable froth spray nozzles and a submersible pump.
12.2. The pump shall be a centrifugal submersible pump installed in the clarifier.
The pump shall be accessible from the clarifier walkway and shall be removable
without having to disturb other components of the clarifier. The pump shall be
capable of delivering to each spray nozzle in the system a minimum flow of 1.8 GPM
at 12 feet of head. The pump motor shall be single phase, 60 hertz, 115 volts, with
built-in thermal protection.
12.3. The froth spray nozzles shall be brass with a minimum opening of 3/16 inches.
All nozzles shall be removable and accessible from the plant walkway.
13. CORROSION PROTECTION
13.1. After completion of factory welding, all steel surfaces of each unit shall be
blasted to bare metal.
13.2. All metal surfaces shall be primed with an amine-cured epoxy primer
producing a minimum dry thickness of 11/2 mils. After a minimum eight-hour drying
10-1-74

• SPECIFICATION NO. PMC1
Page Four
period, an amine adduct epoxy high-built resing shall be applied to produce a 6-mil
total dry thickness on all metal surfaces. The primer shall be red or orange in color
and the finish coat shall be as specified on the plans.
13.3. When cathodic protection is required and called for on the plans, a minimum
of two(2) 17-pouiig anodes shall be connected on opposite sides of each unit utilizing
a minimum 8-foot long insulated copper lead and copper lug connections. All anodes
shall be supplied by the plant manufacturer and installed in strict accordance with
the manufacturer's instructions.
14. ELECTRICAL CONTROLS
14.1. Principal Equipment
The control system shall include but not be limited to a 24-hour indicating
timer, interlock motor starter contacts for the froth pump and a sludge collector
manual starter. Design, fabrication and installation of all electrical components
shall be in accordance with the revision of the National Electrical Code that is
current at the time of award of contract.
14.2. NEC Design
The revision of the National Electrical Code that is current at the time the job
is submitted will be used to evaluate the submittal and for construction of the
approved design.
14.3. Controls
14.3.1. Enclosure
The control equipment shall be housed in a NEMA 3R painted steel
enclosure with a key holding "T"handle.
14.3.2. Circuit Breakers
The motor branch circuits shall be short circuit protected by thermal
magnetic air circuit breakers. The froth pump, sludge collector drive motor,
and the blower controls shall be protected by individual single phase thermal
• magnetic air circuit breakers.
14.3.3. Motor Starters
A magnetic across-the-line starter with overload heaters in each
phase and a common trip contact set shall be provided for each pump motor to
give positive protection against single phasing.
14.3.4. Blower Manual Control
A hand-off-auto (HOA) switch shall be provided in the control panel
for each blower motor.
14.3.5. Blower Automatic Control
A 24-hour time clock will be provided that can be programmed by the
operator to automatically alternate the blower motors every two hours. The
time clock shall include a time-of-day indicator and shall be easily set by
hand.
14.3.6. Froth Pump Controls
The single phase 115 volts supplied to the froth pump shall be
interlocked with the blower motor starters such that the froth pump runs
when either or both blowers are running and is shut off when both blowers
are shut off. A grounded type 3-pronged connector in a weatherproof FS box
shall be provided near the froth pump.
14.3.7. Sludge Collector Drive Controls
A manual starter with integral thermal overload shall be provided on
the bridge to manually control the sludge collector drive motor.
10-1-74

SPECIFICATION NO. PMC1
Page Five
15. START-UP AND OPERATING INSTRUCTIONS
15.1. The plant manufacturer shall
provide detailed instructions conforming with the requirements of the Fedrl Environmental
tion A Agency as set forth inoperating and installation
g Y "Federal Guidelines, Design Operation Maintenance
of Wastewater Treatment Facilities"dated September, 1970. Each set of
g and Maintenance
be prepared especially for the type of plant delivered, and all operating
shall refer only to the particular plant. The manufacturer shall provide books mall
three bound sets of literature and one set of installation drawings ng instructions
delivered with the shipping a minimum of
e plant.
15.2. The plant manufacturer shall provpapers for hde the services of which shall be
for a minimum period of one day a trained representative
fior
period
of operationne per plant to perform initial start-up of the
personnel in the operation and maintenance oftthe
plant and to adjust the equipment for satisfactory
manufacturer's representative performing this service shall be a direct
the plant manufacturer, normally engaged in this operation after installation. The
type of service work
16. WARRANTY
employee of
16.1. The manufacturer of the wastewater treatment plant shall warrant
year from date of shipment that the plant and all related equipment will
defects in design, for one
lieu1 .16.2. Warranties es aguaranteesa b workmanship. be free from
of a single source and
by the suppliers of various plant components in
The plant manufacturer shall be solely responsible for the warrantyof
responsibility Y the plant manufacturer will not be accepted.
all related components.
16.3. In the event a component fails to perform as specified or is the plant and
service during the warranty period, excluding
during operation, the manufacturer shall provide a replacementof partroven defective in
items supply normally expended
the owner.
16.4. This warranty shall be valid onlyifp without cost to
operated under normal conditions and inaccordancet with is properly
lmanuflctu and
instructions.
manufacturer's
17. EQUIpMENT•MANUFACTURER
17.1. In order to establish a standard of quality and to insure a uniform
bidding each wastewater treatment plant furnished shall be a steel
fabri-
cated plant as manufactured by Davco div., Davis Water and Waste Ind basis of
Thomasville, Georgia, or an a factory 17.2. To be considered an approved equal. Industries, Inc.,
must be submitted to the Engineer nolater than seven t details and shop
Sufficient
data must beh submitted so that the Engineer drawings
i to tne that the alternate plant meets ( ) days prior a the bid ation
has the required information
17.3. The equipment specified herein shall be the product of a manthe ufacturer
having
a minimum of 10 years experience in the construction of prefabricated
pumping and treatment a ui having
In lieu of the 10 q Pment. wastewater
id provided a
cash or years experience, any manufacturer may
performance bond in the amount of 1000/0 of the bid price is provided
5-yearto the owner.
17.4. The contractor shall prepare his bid on the basis of the specified
and materials specified for purposes of determining the low bid. After
the contract, substitution of e p fled equipment
considered if the substitution is, in the opinion of the Engineer execution of
equipment of other makes than that specified will be
. equal in quality to

•
SPECIFICATION NO.PMC1
Page Six
that named.If such substitution is approved by the Engineer, all savings effected by
the Contractor in the purchase of the substituted equipment shall be passed on to the
owner by reducing the contract price. .
•
•
-10-1-74

„.
C.
1
1
\ BILL OF MATERIAL BILL OF MATERIAL BILL OF MATERIAL
ITEM PART IC DESCRIPTION QUANTITY R 'TWA PART ML DESCRIPTION - QUANTITY R ITEM PAT NO DESCRIPTION QUANTITY R
—1/1 I 1 i ,..
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SLYOS[ R[TIISN, 1 F •/ Y i i,
INLET 1 SCRAPERS
/
EAR SCUTT RE/OVAL v \
SCREEN UNIT, t
�� reoL ,
1- ETILINE ECRAP[R
NMI PII4=.10 nL
• DRIVE
OVERP LOW,S •, FROTH SPRAT LINE, 1-1// - � ..../- .1� I�I�!!4S1\� r `II _
IIIII
®1 ®T AIR OOAI[R,•�.r® - ♦�"�v I A 1 // 4 T
sum
SLOWED /J 1
I ` / ` —/
I
- l 1/IS .♦�hti NO.I NO.! WELD SLIP ON PLANS!.
- CONTROL INVERT PRO/ TOP OF PLANT.!1
PLAN VIEW ..
STEEL TUSINS r----'-1
\ ILS. 1-1/! i CONTROL 1`• Wi,- PIS LRSL
I SLOWER 1 4. AM/STABLE
ASS
�— - ❑.. g_ --—� _. — WEIN
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13
ulmo
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PUMP VI R[NOVANL 'r I
SLVOS[ _
COLLECTOR 4I
IEO.I/4r ION TANKtHat AERATION TANK SETTLINW TARE I,1 I
AEROBIC DI
SAL. CAP SAL.CAP. -
SAL.CAP
A
SLUICE '
CV.IT. CAP. - 1 ,.
il
...�. SLUICE ,I
N.---' I I' .
t+ DAVIS WATER•WASTE INDUSTRIES,INK
p 3 Atha" -1 IAMIes.IIIo SNsrEM
F`.� .�:rL;Ri!, _.:1 "KL'Y c ":x. ,q� _ .,.is ..,t.. i�1"r',Jr'�:Lv.�1.S�xi 105""NE
SECTION A-A ENWNEOt
nTIE DOWNY a/w DAIS owQ ND
SWS IT SEPT 14

SPECIFICATION NO. PMC1
SUGGESTED EQUIPMENT SPECIFICATION
MECHANICAL COLLECTOR
WASTEWATER TREATMENT PLANT
[PACKAGE]
1. GENERAL
The contractor shall provide and install each factory fabricated wastewater
treatment plant complete with connecting piping and appurtenant work as detailed on the
drawings and specified herein. The plant shall be as manufactured by Davco div., Davis
Water & Waste Industries, Inc., Thomasville, Georgia, or an approved equal.
2. SHOP DRAWINGS
The contractor shall submit a minimum of six (6) copies of all shop drawings to the
Engineer for approval. Of these, two (2) copies will be returned to the contractor with
appropriate action taken. Receipt of less than the minimum required number of copies will
be cause for withholding the shop drawings from being checked until receipt of the
necessary additional copies.
Each set of shop drawings shall include but not necessarily be limited to:
2.1. Drawings showing dimensions of all steel units including dimensions of all
compartments.
2.2. A hydraulic profile showing liquid levels in all compartments with both an
average daily influent rate and a peak influent rate.
2.3. Complete installation instructions including anchor bolt layout, interconnect-
ing piping details and mechanical connections.
2.4. Control data. Data shall be provided that covers the following details:
2.4.1. Approximate enclosure dimensions including height, width and
depth.
2.4.2. Maximum wire size (main terminal block or disconnect device).
2.4.3. Air circuit breaker data including: function, reference designator,
NEMA size, service voltage, phase, number of overload heaters, and coil
voltage.
2.4.5. Motor data shall include: function, horsepower, phase, frequency,
voltage, approximate full load current, service factor, nominal RPM, frame
size, NEMA speed-torque design, and insulation class.
2.4.6. A control schematic diagram shall be provided that shows power and
control circuits in sufficient detail to evaluate the control system design.
2.5. Performance data including, when applicable, blower curves, motor data,
froth pump data and diffuser head loss data.
2.6. All other information necessary to enable the Engineer to determine whether
• the proposed equipment meets the specified requirements.
3. DESIGN REQUIREMENTS
All components supplied shall conform to the size requirements as set forth in the
plans, to the requirements included in other sections of this specification, and to the
following broad design parameters.
10-1-74

SPECIFICATION NO. PMC 1
Page Two
4. STRUCTURAL
4.1. Vertical steel interior bulkheads designated on the plans as hydrostatic and
all outer steel walls shall be structurally designed to withstand full hydrostatic
forces applied from either side of the bulkhead or wall. The design of the interior
hydrostatic bulkheads will be such that each isolated compartment may be
individually dewatered.The method used to initially fill the plant with liquid may be
selected by the Engineer to test the hydrostatic design.
4.2. The tanks shall be constructed of structural grade steel plate with exterior
reinforcing, and internal cross braces as required.
5. CLARIFIER
5.1. The clarifier shall be circular in shape and shall include integral process
tanks as specified in the attached process specifications.
5.2. The clarifier bottom shall be steel and shall have a factory installed sludge
sump and sludge return line. The bottom shall be given final form at the factory by
placement of nonstructural lightweight concrete.
5.3. The clarifier effluent weir, weir trough and scum baffle shall be a polyester
compound reinforced with glass fibers. When completed the weir trough shall
require no caulking or sealant to prevent leakage. The weir, weir trough, and scum
baffle shall he adjustable over a minimum four (4) inch vertical range with all
adjustments requiring only small hand tools. The complete weir trough assembly
shall be completely removable without having to dewater the clarifier.
5.4. The sludge collector assembly shall consist of a rotating central torque tube
with steel sludge scraper arms attached. The scraper blades shall be adjustable
neoprene scrapers attached to the rotary scraper arms. The collector assembly shall
be completely removable without having to dewater the clarifier and shall include a
sludge stirrer for the clarifier sump. The entire collector assembly shall be factory
installed and adjusted and shall be supported from a self-aligning flange block
bearing accessible from the clarifier walkway. The drive mechanism shall have
positive shear pin protection from overload damage.
6. PLANT FABRICATION AND INSTALLATION
6.1. Each plant shall be prefabricated in the factory of the manufacturer and shall
be shipped complete with all necessary related equipment.
6.2. The structure shall consist of rectangular aeration tanks and a circular
settling tank. The principal items of equipment shall include aeration and process
tanks as specified in the attached process specifications, circular settling tank with
mechanical sludge collector and surface scum removal unit, inlet bar screen (when
required), duplex rotary positive blowers with motors and silencing, froth control
system, and central electrical control panel.
Available accessory equipment is listed in another section of these
specifications.
6.4. All work on the tanks and clarifier including welding, on-plant wiring,
interior piping, installation of equipment, and internal and external painting shall be
completed prior to shipment from the factory. Field installation shall entail placing
and anchoring each unit, making external piping and electrical connections,
touching up scuffed places with paint and setting the blowers, motors and control
panel and placement of diffuser drop pipes. When specified, additional components
including but no limited to chlorination equipment, comminutor, flow meter,
handrails and corrosion protection devices shall be field mounted and bolted in place
in accordance with the manufacturer's recommendations.
10-1-74

SPECIFICATION NO. PMC1
Page Three
7. COMPONENT CONSTRUCTION
7.1. The treatment plant shall have a basic rectangular shape. This structure
shall include rectangular compartments and circular settling tank(s). All bulkheads
shall be factory installed. Larger plants may require multiple rectangular tanks.
These units will be coupled together at the job site by pipe connectors, and will
require no field welding.
8. WALKWAYS
All plant units shall be provided with nonskid industrial floor grating. All walkways
shall be an integral part of the unit.
9. BLOWERS
9.1. Each wastewater treatment plant shall be supplied with two rotary, positive
displacement blowers, mounted on the plant with a common base and a central
electric control panel, belt drive system, drip proof induction type electric motors,
necessary valves including a pressure relief valve and silencers as shown on the
plans. All piping and related equipment necessary to connect the blowers to the
plant air header shall be supplied by the plant manufacturer.
9.2. The plant manufacturer shall provide complete installation instructions for
the blower assembly and related piping.
10. AIR DIFFUSER SYSTEM
Where required, noncorrosive air diffusers shall be spaced approximately
twenty-four (24) inches apart and located along one wall of the rectangular tanks. The
diffuser drop pipes shall be one (1) inch minimum diameter and each assembly shall be
designed and installed so as to be removable for cleaning without disturbing the operation
of the plant.
11. INLET BAR SCREEN(When Required)
A removable inlet bar screen shall be mounted at the discharge point of the raw
wastewater influent pipe. This bar screen shall be accessible from the walkway for
cleaning purposes and shall have openings one(1) inch wide.
12. FROTH CONTROL SYSTEM
12.1. The plant manufacturer shall provide an effective froth control system for all
aeration tanks.The system shall consist of a single distribution header for each tank,
removable froth spray nozzles and a submersible pump.
12.2. The pump shall be a centrifugal submersible pump installed in the clarifier.
The pump shall be accessible from the clarifier walkway and shall be removable
without having to disturb other components of the clarifier. The pump shall be
capable of delivering to each spray nozzle in the system a minimum flow of 1.8 GPM
at 12 feet of head. The pump motor shall be single phase, 60 hertz, 115 volts, with
built-in thermal protection. •
12.3. The froth spray nozzles shall be brass with a minimum opening of 3/16 inches.
All nozzles shall be removable and accessible from the plant walkway.
13. CORROSION PROTECTION
13.1. After completion of factory welding, all steel surfaces of each unit shall be
blasted to bare metal.
13.2. All metal surfaces shall be primed with an amine-cured epoxy primer
producing a minimum dry thickness of 11/2 mils. After a minimum eight-hour drying
10-1-74

SPECIFICATION NO.PMC1
Page Four
period, an amine adduct epoxy high-built resing shall be applied to produce a 6-mil
total dry thickness on all metal surfaces. The primer shall be red or orange in color
and the finish coat shall be as specified on the plans.
13.3. When cathodic protection is required and called for on the plans, a minimum
of two (2) 17-poung anodes shall be connected on opposite sides of each unit utilizing
a minimum 8-foot long insulated copper lead and copper lug connections. All anodes
shall be supplied by the plant manufacturer and installed in strict accordance with
the manufacturer's instructions.
14. ELECTRICAL CONTROLS
14.1. Principal Equipment
The control system shall include but not be limited to a 24-hour indicating
timer, interlock motor starter contacts for the froth pump and a sludge collector
manual starter. Design, fabrication and installation of all electrical components
shall be in accordance with the revision of the National Electrical Code that is
current at the time of award of contract.
14.2. NEC Design
The revision of the National Electrical Code that is current at the time the job
is submitted will be used to evaluate the submittal and for construction of the
approved design.
14.3. Controls
14.3.1. Enclosure
The control equipment shall be housed in a NEMA 3R painted steel
enclosure with a key holding '•T"handle.
14.3.2. Circuit Breakers ,_,
The motor branch circuits shall be short circuit protected by thermal
magnetic air circuit breakers. The froth pump, sludge collector drive motor,
and the blower controls shall be protected by individual single phase thermal
magnetic air circuit breakers.
14.3.3. Motor Starters
A magnetic across-the-line starter with overload heaters in each
phase and a common trip contact set shall be provided for each pump motor to
give positive protection against single phasing.
14.3.4. Blower Manual Control
A hand-off-auto (HOA) switch shall be provided in the control panel
for each blower motor.
14.3.5. Blower Automatic Control
A 24-hour time clock will be provided that can be programmed by the
operator to automatically alternate the blower motors every two hours. The
time clock shall include a time-of-day indicator and shall be easily set by
hand.
14.3.6. Froth Pump Controls
The single phase 115 volts supplied to the froth pump shall be
interlocked with the blower motor starters such that the froth pump runs
when either or both blowers are running and is shut off when both blowers
are shut off. A grounded type 3-pronged connector in a weatherproof FS box
shall be provided near the froth pump.
14.3.7. Sludge Collector Drive Controls
A manual starter with integral thermal overload shall be provided on
the bridge to manually control the sludge collector drive motor.
10-1-74

SPECIFICATION NO.PMC1
Page Six
that named.If such substitution is approved by the Engineer, all savings effected by
the Contractor in the purchase of the substituted equipment shall be passed on to the
owner by reducing the contract price.
•
-10-1-74

•
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ONA IT SIPS 14

SPECIFICATION NO. PMC1
SUGGESTED EQUIPMENT SPECIFICATION
MECHANICAL COLLECTOR
WASTEWATER TREATMENT PLANT
[PACKAGE]
1. GENERAL
The contractor shall provide and install each factory fabricated wastewater
treatment plant complete with connecting piping and appurtenant work as detailed on the
drawings and specified herein. The plant shall be as manufactured by Davco div., Davis
Water & Waste Industries, Inc., Thomasville, Georgia, or an approved equal.
2. SHOP DRAWINGS
The contractor shall submit a minimum of six (6) copies of all shop drawings to the
Engineer for approval. Of these, two (2) copies will be returned to the contractor with
appropriate action taken. Receipt of less than the minimum required number of copies will
be cause for withholding the shop drawings from being checked until receipt of the
necessary additional copies.
Each set of shop drawings shall include but not necessarily be limited to:
2.1. Drawings showing dimensions of all steel units including dimensions of all
compartments.
2.2. A hydraulic profile showing liquid levels in all compartments with both an
average daily influent rate and a peak influent rate.
2.3. Complete installation instructions including anchor bolt layout, interconnect-
ing piping details and mechanical connections.
2.4. Control data. Data shall be provided that covers the following details:
2.4.1. Approximate enclosure dimensions including height, width and
depth.
2.4.2. Maximum wire size (main terminal block or disconnect device).
2.4.3. Air circuit breaker data including: function, reference designator,
NEMA size, service voltage, phase, number of overload heaters, and coil
voltage.
2.4.5. Motor data shall include: function, horsepower, phase, frequency,
voltage, approximate full load current, service factor, nominal RPM, frame
size, NEMA speed-torque design, and insulation class.
2.4.6. A control schematic diagram shall be provided that shows power and
control circuits in sufficient detail to evaluate the control system design.
2.5. Performance data including, when applicable, blower curves, motor data,
froth pump data and diffuser head loss data.
2.6. All other information necessary to enable the Engineer to determine whether
the proposed equipment meets the specified requirements.
3. DESIGN REQUIREMENTS
All components supplied shall conform to the size requirements as set forth in the
plans, to the requirements included in other sections of this specification, and to the
following broad design parameters.
10-1-74

• SPECIFICATION NO. PMC 1
Page Two
4. STRUCTURAL
4.1. Vertical steel interior bulkheads designated on the plans as hydrostatic and
all outer steel walls shall be structurally designed to withstand full hydrostatic
forces applied from either side of the bulkhead or wall. The design of the interior
hydrostatic bulkheads will be such that each isolated compartment may be
individually dewatered.The method used to initially fill the plant with liquid may be
selected by the Engineer to test the hydrostatic design.
4.2. The tanks shall be constructed of structural grade steel plate with exterior
reinforcing, and internal cross braces as required.
5. CLARIFIER
5.1. The clarifier shall be circular in shape and shall include integral process
tanks as specified in the attached process specifications.
5.2. The clarifier bottom shall be steel and shall have a factory installed sludge
sump and sludge return line. The bottom shall be given final form at the factory by
placement of nonstructural lightweight concrete.
5.3. The clarifier effluent weir, weir trough and scum baffle shall be a polyester
compound reinforced with glass fibers. When completed the weir trough shall
require no caulking or sealant to prevent leakage. The weir, weir trough, and scum
baffle shall he adjustable over a minimum four (4) inch vertical range with all
adjustments requiring only small hand tools. The complete weir trough assembly
shall be completely removable without having to dewater the clarifier.
5.4. The sludge collector assembly shall consist of a rotating central torque tube
with steel sludge scraper arms attached. The scraper blades shall be adjustable
neoprene scrapers attached to the rotary scraper arms.The collector assembly shall
be completely removable without having to dewater the clarifier and shall include a
sludge stirrer for the clarifier sump. The entire collector assembly shall be factory
installed and adjusted and shall be supported from a self-aligning flange block
bearing accessible from the clarifier walkway. The drive mechanism shall have
positive shear pin protection from overload damage.
6. PLANT FABRICATION AND INSTALLATION
6.1. Each plant shall be prefabricated in the factory of the manufacturer and shall
be shipped complete with all necessary related equipment.
6.2. The structure shall consist of rectangular aeration tanks and a circular
settling tank. The principal items of equipment shall include aeration and process
tanks as specified in the attached process specifications, circular settling tank with
mechanical sludge collector and surface scum removal unit, inlet bar screen (when
required), duplex rotary positive blowers with motors and silencing, froth control
system, and central electrical control panel.
Available accessory equipment is listed in another section of these
specifications.
6.4. All work on the tanks and clarifier including welding, on-plant wiring,
interior piping, installation of equipment, and internal and external painting shall be
completed prior to shipment from the factory. Field installation shall entail placing
and anchoring each unit, making external piping and electrical connections,
touching up scuffed places with paint and setting the blowers, motors and control
panel and placement of diffuser drop pipes. When specified, additional components
including but no limited to chlorination equipment, comminutor, flow meter,
handrails and corrosion protection devices shall be field mounted and bolted in place
in accordance with the manufacturer's recommendations.
10-1-74

•
SPECIFICATION NO.PMC1
Page Three
7. COMPONENT CONSTRUCTION
7.1. The treatment plant shall have a basic rectangular shape. This structure
shall include rectangular compartments and circular settling tank(s). All bulkheads
shall be factory installed. Larger plants may require multiple rectangular tanks.
These units will be coupled together at the job site by pipe connectors, and will
require no field welding.
8. WALKWAYS
All plant units shall be provided with nonskid industrial floor grating. All walkways
shall be an integral part of the unit.
9. BLOWERS
9.1. Each wastewater treatment plant shall be supplied with two rotary, positive
displacement blowers, mounted on the plant with a common base and a central
electric control panel, belt drive system, drip proof induction type electric motors,
necessary valves including a pressure relief valve and silencers as shown on the
plans. All piping and related equipment necessary to connect the blowers to the
plant air header shall be supplied by the plant manufacturer.
9.2. The plant manufacturer shall provide complete installation instructions for
the blower assembly and related piping.
10. AIR DIFFUSER SYSTEM
Where required, noncorrosive air diffusers shall be spaced approximately
twenty-four (24) inches apart and located along one wall of the rectangular tanks. The
diffuser drop pipes shall be one (1) inch minimum diameter and each assembly shall be
designed and installed so as to be removable for cleaning without disturbing the operation
of the plant.
11. INLET BAR SCREEN(When Required)
A removable inlet bar screen shall be mounted at the discharge point of the raw
wastewater influent pipe. This bar screen shall be accessible from the walkway for
cleaning purposes and shall have openings one(1) inch wide.
12. FROTH CONTROL SYSTEM
12.1. The plant manufacturer shall provide an effective froth control system for all
aeration tanks.The system shall consist of a single distribution header for each tank,
removable froth spray nozzles and a submersible pump.
12.2. The pump shall be a centrifugal submersible pump installed in the clarifier.
The pump shall be accessible from the clarifier walkway and shall be removable
without having to disturb other components of the clarifier. The pump shall be
capable of delivering to each spray nozzle in the system a minimum flow of 1.8 GPM
at 12 feet of head. The pump motor shall be single phase, 60 hertz, 115 volts, with
built-in thermal protection. •
12.3. The froth spray nozzles shall be brass with a minimum opening of 3/16 inches.
All nozzles shall be removable and accessible from the plant walkway.
13. CORROSION PROTECTION
13.1. After completion of factory welding, all steel surfaces of each unit shall be
blasted to bare metal.
13.2. All metal surfaces shall be primed with an amine-cured epoxy primer
producing a minimum dry thickness of 11/2 mils. After a minimum eight-hour drying
10-1-74

SPECIFICATION NO.PMC1
Page Four
period, an amine adduct epoxy high-built resing shall be applied to produce a 6-mil
total dry thickness on all metal surfaces. The primer shall be red or orange in color
and the finish coat shall be as specified on the plans.
13.3. When cathodic protection is required and called for on the plans, a minimum
of two(2) 17-poung anodes shall be connected on opposite sides of each unit utilizing
a minimum 8-foot long insulated copper lead and copper lug connections. All anodes
shall be supplied by the plant manufacturer and installed in strict accordance with
the manufacturer's instructions.
14. ELECTRICAL CONTROLS
14.1. Principal Equipment
The control system shall include but not be limited to a 24-hour indicating
timer, interlock motor starter contacts for the froth pump and a sludge collector
manual starter. Design, fabrication and installation of all electrical components
shall be in accordance with the revision of the National Electrical Code that is
current at the time of award of contract.
14.2. NEC Design
The revision of the National Electrical Code that is current at the time the job
is submitted will be used to evaluate the submittal and for construction of the
• approved design.
14.3. Controls
14.3.1. Enclosure
The control equipment shall be housed in a NEMA 3R painted steel
enclosure with a key holding "T"handle.
14.3.2. Circuit Breakers
The motor branch circuits shall be short circuit protected by thermal
magnetic air circuit breakers. The froth pump, sludge collector drive motor,
and the blower controls shall be protected by individual single phase thermal
magnetic air circuit breakers.
14.3.3. Motor Starters
A magnetic across-the-line starter with overload heaters in each
phase and a common trip contact set shall be provided for each pump motor to
give positive protection against single phasing.
14.3.4. Blower Manual Control
A hand-off-auto (HOA) switch shall be provided in the control panel
for each blower motor.
14.3.5. Blower Automatic Control
A 24-hour time clock will be provided that can be programmed by the
operator to automatically alternate the blower motors every two hours. The
time clock shall include a time-of-day indicator and shall be easily set by
hand.
14.3.6. Froth Pump Controls
The single phase 115 volts supplied to the froth pump shall be
interlocked with the blower motor starters such that the froth pump runs
when either or both blowers are running and is shut off when both blowers
are shut off. A grounded type 3-pronged connector in a weatherproof FS box
shall be provided near the froth pump.
14.3.7. Sludge Collector Drive Controls
A manual starter with integral thermal overload shall be provided on
the bridge to manually control the sludge collector drive motor.
10-1-74

SPECIFICATION NO.PMC1
Page Six
that named.If such substitution is approved by the Engineer, all savings effected by
the Contractor in the purchase of the substituted equipment shall be passed on to the
owner by reducing the contract price.
-10-1-74

SPECIFICATION NO. EXEA
EXPLANATION OF DAVCO MODEL NUMBER
FOR
EXTENDED AERATION SEWAGE TREATMENT PLANT
9 D A 10 S C D M
I Modified
Dosing Tank
Hypochlorinator
Sludge Holding Tank
Capacity of Aeration Tank in 1000 gallons(10,000 gallons)
Aerobic Treatment Plant
Davco Manufacturing Company
Width of Plant in Feet(9'Wide)
Example No. 1
Model No. 11DA16SC
The plant is eleven feet wide, Davco Manufacturing Company, Aerobic Type Treatment,
Capacity of Aeration Tank is 16,000 gallons, provided with Sludge Holding Tank and
Chlorinator.
Example No. 2
Model No. 12DA40CM
The Plant is twelve feet wide, Davco Manufacturing Company, Aerobic Type Treatment,
Capacity of Aeration Tank is 40,000 gallons (this is not standard so "M" is last letter in
model number signifying modified), provided with Chlorinator.
10-1-74

•
SPECIFICATION NO. EXEA
Page Two
AERATION TANK
Gallons Minimum No.
Model No. Capacity Long Wide SWD Cu. Ft. of Diffusers
6DA2 2,000 4'111/2" 6' 9' 267 2
6DA3 3,000 7'5" 6' 9' 400 2
6DA4 4,000 9'11'. 6' 9' 533 4
6DA5 5,000 12'5" 6' 9' 667 6
6DA6 6,000 14'10" 6' 9' 800 6
6DA7 7,000 17'4" 6' 9' 933 8
9DA8 8,000 13'2" 9' 9' 1067 6
9DA9 9,000 14'10" 9' 9' 1200 6
9DA10 10,000 16'6" 9' 9' 1333 8
9DA11 11,000 18'2" 9' 9' 1467 8
9DA12 12,000 19'10" 9' 9' 1600 8
9DA14 14,000 23'1" 9' 9' 1867 10
11DA16 16,000 21'7" 11' 9' 2133 10
11DA18 18,000 24'4" 11' 9' 2400 12
11DA20 20,000 27' 11' 9' 2667 12
12DA22 22,000 28'9" 11'41/27 9' 2933 12
12DA26 26,000 34' 11'41/2" 9' 3467 16
12DA28 28,000 36'7" 11'41/2" 9' 3733 16
12DA30 30,000 39'2" 11'41/2" 9' 4000 18
12DA35 35,000 45'8" 11'41/2" 9' 4667 22
-,.,,.:_ 12DA40 40,000 52'3" 11'41/2" 9' 5333 26
Inside dimensions does not include exterior reinforcing.
Add 31/2"each side for overall length and width. `J
SETTLING TANK
Surface Load Weir Loading
Model No. Dia. SWD Sq. Ft. Cu. Ft. Gallons Gal/SqFt/Day Length Gal/Day/ft.
6DA2 6' 8'11" 28 249 1871 71.5 18' 111
6DA3 6' 8'11" 28 249 1871 107 18' 167
6DA4 6' 8'11" 28 249 1871 143 18' 222
6DA5 6' 8'11" 28 249 1871 179 18' 278
6DA6 6' 8'11" 28 249 1871 210 18' 328
6DA7 6' 8'11" 28 249 1871 245 18' 383
9DA8 9' 8'11" 64 561 4207 125 28' 286
9DA9 9' 8'11" 64 561 4207 140 28' 320
9DA10 9' 8'11" 64 561 4207 156 28' 358
9DA11 9' 8'11" 64 561 4207 170 28' 390
9DA12 9' 8'11" 64 561 4207 185 28' 430
9DA14 9' 8'11" 64 561 4207 219 28' 500
11DA16 11' 8'11" 95 767, 6295 168 34' 471
11DA18 11' 8'11" 95 767 6295 189 34' 529
11DA20 11' 8'11" 95 767 6295 210 34' 588
12DA22 12' 8'11" 113 932 6970 193 37' 591
12DA24 12' 8'11" 113 932 6970 212 37' 648
12DA26 12' 8'11" 113 932 6970 230 37' 703
12DA28 12' 8'11" 113 932 6970 245 37' 753
12DA30 12' 8'11" 113 932 6970 265 37' 806 ..�
12DA35 12' 8'11" 113 932 6970 310 37' 946
iiii 12DA40 12' 8'11" 113 932 6970 354 37' 1082
10-1-74

SPECIFICATION NO. EXEA
Page Three
CHLORINE CONTACT TANK
A B SWD Sq. Ft. Cu.Ft. Gallons
6' 1' 8' 9.44 75.5 566
9' 1' 8' 17.71 141.7 1063
11' 1' 8' 24.0 192.0 1440
12' 1' 8' 25.4 203.2 1524
Chlorine is applied to the overflow of the settling tank at the far end of chlorination
chamber. A continuously running chlorinator is used to feed the chlorine solution to the
settling tank effluent.
A baffle is installed in the chlorination chamber to prevent short circuiting of the tank
and thus providing an adequate detention time for the entire tank contents.
The automatic chlorinator should be adjusted to feed the correct amount of solution in
accordance with the plant flow. This is usually done by first computing the amount of
chlorine to be applied. (Tank capacity, average flow into plant and strength of chlorine
mixture in containers should be known.)A chlorine test kit is used to measure the amount of
available chlorine in the effluent.The automatic chlorinator should be adjusted to provide a
residual of at least 2.0 P.P.M. of available chlorine.
SLUDGE HOLDING TANK
CFM Air
•.... Model No. Wide Long SWD Cu.Ft. Required
6DA2 6'0" 1'9" 9'6" 100 2
6DA3 6'0" 1'9" 9'6" 100 2
6DA4 6'0" 1'9" 9'6" 100 2
6DA5 6'0" 1'9" 9'6" 100 2
6DA6 6'0" 2'6" 9'6" 140 3
6DA7 6'0" 2'6" 9'6" 140 3
9DA8 9'0" 2'2" 9'6" 180 4
• 9DA9 9'0" 2'2" 9'6" 180 4
9DA10 9'0" 2'10" 9'6" 240 5
9DA11 9'0" 2'10" 9'6" 240 5
9DA12 9'0" 2'10" 9'6" 240 5
9DA14 9'0" 3'6" 9'6" 300 6
11DA16 11'0" 3'4" 9'6" 340 7
11DA18 11'0" 3'10" 9'6" 400 8
12DA22 11'41/2" 4'1" 9'6" 440 9
12DA24 11'41/2" 4'8" 9'6" 500 10
12DA26 11'41/2" 5'2" 9'6" 560 12
12DA28 11'41/2" 5'2" 9'6" 560 12
12DA30 11'41/2" 5'7" 9'6" 600 12
12DA35 11'41/2" 6'6" 700 14
-.--glos 12DA40 11'41/2" 7'S" 9'6" 800 16
NOTE: Tank size based on 2 cu.ft.per capita.
All dimensions are inside dimensions.
•
10-1-74

SPECIFICATION NO. EXEA
Page Four
(GENERAL INFORMATION— DO NOT USE FOR DESIGN)
DAVCO SEWAGE TREATMENT PLANT
A 9 D
- E ,
F _
EXTENDED AERATION PLANTS
SINGLE SECTION
A Q C D E F
6DA2 1 '9" 4'11'2" 12" 6'0" 12'0" 13'9-1/4"
6DA3 1 '9" 7'5" 12" 6'0" 14'52" 16'2-3/4"
6DA4 1 '9" 9'11" 12" 6'0" 16' 111/2" 18'8-3/4"
6DA5 1 '9" 12'412" 12" 6'0" 17'5" 21 '2-1/4"
6DA6 2'6" 14'10" 12" 6'0" 21 ' 10-" 24'4-3/4"
6DA7 2'6" 17'4" 12" 6'0" 24'4'2" 26' 10-3/4"
6DA8 2'10" 19'10" 12". 6'0" 26' 102" 29'8-3/4"
9DA9 2'2" 14'10" 12" 9'0" 24' 1O'," 27'3/4"
9DA10 2'6" 16'6" 12" Q '0" 26'6' " 28'2-3/4''
9DA11 2'8" 18'2" 12" 9'0" 28'2';" 30' 10-3/4"
9DA12 2' 10" 19' 10" 12" 9'0" 2911O'2" 32'8-3/4"
9DA14 3'4" 23' 1" 12" 9'0" 33' P-" 36' 5-3/4"
11 DA16 3'1" 21 ' 7" 12" • 11 '0" 33' 7 2" 36'8-3/4"
Dimensions are inside only - for total plant length add 3'," for
stiffening.
10-1-74

_ .
1
f A + 9 24kI-.--- D —..
1 6
E
F
EXTENDED AIR DUAL SECTION
A R E F
110A18 3'6" 24 '4" 12" 11DO" G
110A20 3' 10" 27'4° 12�� 38'4-3/4" 41 '11" 27'10-3/4"
11DA22 4'3" 29'8'; 12" 11 '0" 43 '9-1/4" 48'l/2" 34'1/43/4��
12DA24 4'6" 31 '4" 1?" 11 ' 11" 46'3-3/4" 50'10" 35' 10-3/4"
A D- 24 22 ' 9- 1 2 " 9 +off-- II' 1I "
C - 24
35' '
o- 12 41
►d
t�
A B C 0 E
1211426 4'10" 11 '2" 33'11-1/2" 16'3/4" 53'9-3/4"
12DA28 5'2" 13'94" 36'6-3/4" y
12DA30 5'7" 16'4,2,E 39 2„ / 19 0" 56 g- o
Q 12DA35 6'6" 22'11" 45'8-1 2" 22 1/4 59'8-1/4" z
;r.; 12DA40 7'5" 2g'SZ'� 52'3" / 29'5-3/4" 67'2-3/4" w O
_. 36'11-1/4" 74'8-1/4" W
Dimensions are inside onlyq
for stiffening. - for total plant length add 3'-2'

t
1 4 '
' SPECIFICATION NO. EXEA
Page Seven
�- AIR REQUIREMENTS
AT 2000 FT.3 AIR/LB. BOD
CFM Sludge Total At Motor
Model No. Lb.BOD (Aeration Tank) Air Lift Holding 5 PSI H.P.
12DA26 44.2 61.3 1.3 11.0 73.6 5
12DA28 47.6 '66.0 1.5 12.0 79.5 5
12DA30 51.0 70.8 1.6 12.0 90.4 5
12DA35 59.5 82.7 1.8 14.0 97.8 5
12DA40 68.0 94.5 2.0 16.0 117.5 5
AIR REQUIREMENTS
AT 2100 FT.3 AIR/LB.BOD
CFM Sludge Total At Motor
Model No. Lb. BOD (Aeration Tank) Air Lift Holding 5 PSI H.P.
6DA2 3.5 5.1 .1 2.0 7.2 1
6DA3 5.1 7.4 .2 2.0 9.6 11/2
6DA4 6.8 9.9 .3 2.0 12.2 11A
6DA5 8.5 12.4 .3 2.0 14.7 11/2
6DA6 10.2 14.9 .4 - 3.0 18.3 11/2
6DA7 11.9 17.4 .4 3.0 20.8 2
9DA8 13.6 19.9 .5 3.0 23.4 2
9DA9 15.3 22.3 .5 4.0 26.8 2
9DA10 17.0 24.8 .6 4.0 29.8 2
9DA11 18.7 27.3 .6 5.0 32.9 2
9DA12 20.4 29.8 .6 5.0 35.4 2
9DA14 33.0 34.7 .7 6.0 41.4 3
11DA16 27.2 39.7 .8 7.0 47.5 3
11DA18 30.6 44.5 .9 7.0 52.4 3
11DA20 34.0 49.6 1.0 8.0 56.6 3
12DA22 37.4 54.5 1.2 9.0 61.7 3
12DA24 40.8 59.5 1.3 10.0 70.8 3
12DA26 44.2 64.4 1.3 11.0 76.7 5
12DA28 47.6 69.3 1.5 12.0 27.8 5
12DA30 51.0 73.3 1.6 12.0 86.9 5
12DA35 59.5 86.1 1.8 14.0 100.8 5
12DA40 68.0 99.0 2.0 16.0 117.0 5
LI
10-1-74