NC0086304_Authorization to Construct_19990823

a
19 Dewberry & Davis
August 23, 1999
NPDES Unit
DENR/DWQ
P.O. Box 29535
Raleigh, NC 27626-0535
ingineers Consulting Engineers
Planner= 600 Lexington Ave.
.9, eevnrs Charlotte. NC 28203
704 342-0401
Fax [phone]
4U6 2 4 1999
RE: AUTHORIZATION TO CONSTRUCT
NPDES PERMIT NUMBER: NCO086304
CATAWBA COUNTY SCHOOLS — EAST CATA`.;'BA PIDDLE SCHOOL
DEWBERRY & DAVIS PROJECT: C7091
Gentlemen:
Please find enclosed one (1) copy of the Engineer's Certification for the referenced project. If
you have any comments or questions or require further information, please contact this office at
your earliest convenience.
Sincerely,
Dewberry &Davis
Birk Ayer, Pam.
Project Engineer
Attachments
CC: Mr. Ernest Williams, Catawba County Schools
Mr. H.L. Moorefield, Jr., P.E., Dewberry & Davis
Mr. Russell Williams, Catawba County Health Department
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Permit No. NC0086304
ATC Number 086304ACA
Page 3
Engineer's Certification
I, Birk Ayer, P.E. as a duly registered Professional Engineer in the State of
North Carolina, having been authorized to observe (periodically, weekly, full time) the construction
of
the project, East Catawba Middle School Catawba County, NC for
the
Project Name Location
Permittee hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the following installations:
• Two (2) septic tanks, nominal sizes: 1600 gallons and 3200 gallons.
• An 11.5 ft x 10 ft dosing tank with dual siphons.
• Two (2) 1152 sq. ft. each sand filter beds with liners, distribution piping and underdrains.
• A recirculating pump station with dual recirculation and dual discharge pumps.
• A dual module UV disinfection unit.
• On -site potable water with back -flow prevention.
• Electrical controls, manholes, cleanouts, piping, valves and appurtenances.
As required in the this ATC, the following requirements have been met:
1. Storing spare UV racks and bulbs on site for use in emergency or failure.
2. Installation of a grease trap if the school will have a cafeteria (under this contract or another
contract).
I certify that the construction of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Signature Registration No. 24060
Date August 23, 1999
In addition, please check one of the following:
❑ There are still some major components that require completion. Another Engineer's
Certificate will be submitted once all substantial construction has been completed.
❑x All substantial construction has been completed. The permittee understands that they are
required to meet any new permit limits at the expanded flow. Please notify compliance.
Mail this Certification to the NPDES Unit
DENR/DWQ
P.O. Box 29535
Raleigh, NC 27626-0535.
86304ACA ATC Itr

State of North Carolina
Department of Environment ALTV and Natural Resources A. 0
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary NCDENR
A. Preston Howard, Jr., P.E., Director
January 5, 1999
Mr. Ernest Williams
Construction Coordinator
Catawba County Schools
P.O. Box 1000
Newton, North Carolina 28658
Dear Mr. Williams:
Subject: Permit No. NCO086304
Authorization to Construct
Project No. 086304ACA
East Catawba Middle School
Catawba County
The Division received a letter of request for an Authorization to Construct October 6, 1998 and final
plans and specifications for the subject project have been reviewed and found to be satisfactory.
Authorization is hereby granted for the construction of a new 0.0065 MGD wastewater treatment
facility at the East Catawba Middle School in Catawba County with discharge into the Balls Creek in
the Catawba River Basin.
Specifically, authorization is granted for the construction/installation of -
Two (2) septic tanks, nominal sizes: 1600 gallons and 3200 gallons.
An 11.5 ft x 10 ft dosing tank with dual siphons. .
Two (2) 1152 sq. ft. each sand filter beds with liners, distribution piping and underdrains.
A recirculating pump station with dual recirculation and dual discharge pumps.
A dual module UV disinfection unit.
On -site potable water with back -flow prevention.
Electrical controls, manholes, cleanouts, piping, valves and appurtenances.
This ATC is issued contingent upon the following requirements being met:
1. Cancellation of classes during power outages.
2. Storing spare UV racks and bulbs on site for use in emergency or failure.
3. Installation of a grease trap if the school will have a cafeteria (under this contract or another
contract).
This Authorization to Construct is issued in accordance with Part III, Paragraph A of NPDES Permit
No. NCO086304 issued September 25, 1998, and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified in
Permit No. NC0086304.
The sludge generated from these treatment facilities must be disposed of in accordance with G.S.
143-215.1 and in a manner approved by the North Carolina Division of Water Quality.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]/FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Permit No. NCO086304
ATC Number 086304ACA
Page 2
by this Division, such as the construction of additional or replacement wastewater treatment or
disposal facilities.
The Mooresville Regional Office, telephone number [phone], shall be notified at least forty-
eight (48) hours in advance of operation of the installed facilities so that an in -place inspection can be
made. Such notification to the regional supervisor shall be made during the normal office hours from
8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.
Upon completion of construction and prior to operation of this permitted facility, a certification must
be received from a professional engineer certifying that the permitted facility has been installed in
accordance with the NPDES Permit, this Authorization to Construct and the approved plans and
specifications. Mail the Certification to the NPDES Unit, P.O. Box 29535, Raleigh, NC 27626-0535.
Upon classification of the facility by the Certification Commission, the Permittee shall employ a
certified wastewater treatment plant operator to be in responsible charge (ORC) of the wastewater
treatment facilities. The operator must hold a certificate of the type and grade at least equivalent to or
greater than the classification assigned to the wastewater treatment facilities by the Certification
Commission. The Permittee must also employ a certified back-up operator of the appropriate type
and grade to comply with the conditions of Title 15A, Chapter 8A, .0202. The ORC of the facility
must visit each Class I facility at least weekly and each Class II, III, and IV facility at least daily,
excluding weekends and holidays, and must properly manage and document daily operation and
maintenance of the facility and must comply with all other conditions of Title 15A, Chapter 8A,
.0202. Once the facility is classified, the Permittee must submit a letter to the Certification
Commission which designates the operator in responsible charge within thirty days after the
wastewater treatment facilities are 50% complete.
The Operational Agreement between the Permittee and the Environmental Management Commission
is incorporated herein by reference and is a condition of this Permit. Noncompliance with the terms
of the Operational Agreement shall subject the Permittee to all sanctions provided by G. S. 143-215.6
for violation of or failure to act in accordance with the terms and conditions of this Permit.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by the Division of Water Quality in accordance with North
Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
One (1) set of approved plans and specifications is being forwarded to you. The Pennittee shall
maintain a copy of the approved plans and specifications on file for the life of the facility. If you
have any questions or need additional information, please contact Steve Pellei, telephone number
[phone], extension 516.
Sincerely,
fA�
/Preston Howard, Jr., .E.
cc: Central Files
NPDES Unit, Permit File
Mooresville Regional Office, Water Quality
Technical Assistance and Certification Unit
Mr. Birk Ayer, RE,, Dewberry & Davis
600 Lexington Avenue, Charlotte, North Carolina 28203
86304ACA ATC Itr

Dewberry & Davis
April 1, 1999
John N. Gilbert, III
Gilbert Engineering Company
P.O. Box 828
Statesville, NC
Engineer Cmssulliag Engineers
Planner 600 Lexington Ave.
Surveyor Charlotte, NC 28203
704 342-0401
Fax [phone]
Reference: East Catawba Middle School W- 06` 5 C 3 o4-
D&D Project No. C7091
Dear Mr. Gilbert:
As discussed during the preconstruction conference, we have obtained approval from the
N.C. Department of Envirionment & Natural Resoures (NCDENR) to modify the
specification for sand filter media. The media currently specified is not widely available.
Acceptable media for the sand filter include fine filter sand with an effective size between
0.35-0.60 mm, a uniformity coefficient less than 3.0, and dust content less than 0.5
percent. This sand is available from several suppliers throughout North Carolina. A
partial list of suppliers is attached. Please call if you have any comments or questions.
Sincerely,
DEWBERRY & DAVIS
Birk Ayer, P.E.
Project Engineer
CC: Mr. Ernest Williams - Catawba County Schools�P
Mr. Steve Pellei - NPDES Unit, NCDENR J
Mr. H.L. Moorefield, P.E. - Dewberry & Davis
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Dewberry & Davis
December 22, 1998
Mr. Steven Pellei
North Carolina Division of Water Quality
512 North Salisbury Street
Raleigh, NC 27604
Engineers Consulting Engineers
Planners 600 Lexington Ave.
Surveyors Charlotte, NC 28203
704 342-0401
Fax [phone]
RE: AUTHORIZATION TO CONSTRUCT _
NPDES PERMIT NUMBER: NCO086304
CATAWBA COUNTY SCHOOLS — EAST CATAWBA MIDDLE SCHOOL
DEWBERRY & DAVIS PROJECT: C7091
Dear Mr. Pellei:
Enclosed are three (3) copies each of the revised Drawings and Specifications for the above
referenced project. We offer the following in response to your review comments received by
phone on December 17, 1998:
V 1. Will grease trap be installed under separate contract?
The grease trap will be installed under separate contract. It was designed by McKnight,
Smith & Ward. On the previous submittal we provided a detail and a copy of the submittal
drawing for the grease interceptor.
✓ 2. Need copy of design calculations. Previous copy destroyed in move.
Enclosed are three copies of the project design calculations. Professional Engineer.
3. Need copy of sand filter specification.
Three copies of the project specifications are enclosed. Specifications for the sand filter bed
can be found in Section 13360.2.05.
4. Per Regional Office comment: Flow based on 10 gpd per student should be ok for this
project. Typically like to see flow based on 12 or 15 gpd.
The NPDES Permitted flow for this project is 10 gpd per student.
Virginia Maryland North Carolina California Georgia New Jersey New York Connecticut Massachusetts Pennsylvania Texas Oklahoma

44
Mr. Steven Pellei
NC Division of Water Quality
December 22, 1998
Page 2 of 3
Is potable water supplied by well?
The school is served by a municipal water system. Wells are not utilized at the school.
6. Provide detail of clean -out.
A clean -out detail has been added to Sheet 4 of 7 of the revised drawings.
7. Provide detail of rip -rap apron at point of discharge.
A detail of the rip -rap apron has been added to sheet 4 of 7 of the revised drawings.
8. Provide detail of sand filter liner. Specifically, how does it connect to the wall?
The 30 mil polyethelene liner will extend up the walls of the sand filter. The detail on sheet
e Tof 7 has been revised to reflect the liner.
9. Recommend sampling point be made easily accessible — not too heavy of a lid, not too
deep.
A sample station has been added at station 1+30 and is shown on sheet 4 of 7. This pre -cast
concrete box will be 5.3' feet deep. A 2'x3' lockable aluminum access door has been
specified to facilitate ease of use by the operator.
14. tand-by power must be provided. Generator receptacle is not sufficient. Stand-by
'activated in the event of rime power failure.
power generator must be automatically primary
May reconsider this item if documentation can be provided that no stand-by power is
provided for the school resulting in school closing during power outages (i.e. no flow).
Catawba County Schools will respond to this comment under separate cover. No changes
have been made to the revised plans and specifications with regard to stand-by power at this
time.
11. Continuous recording flow meter not required by NPDES permit.
Though not required by the Division of Water Quality, we have chosen to include the
continuous recording flow meter at this time.
It Dewberry & Davis

Mr. Steven Pellei
NC Division of Water Quality
December 22, 1998
Page 3 of 3
We believe this submittal addresses all of the comments received from the Division of Water
Quality. If you have any comments or questions or require further information, please contact
this office at your earliest convenience. We appreciate your assistance with this project.
Sincerely,
Dewberry & Davis
Birk Ayer, P.
Er
Project Engineer
Attachments
Mr. Ernest Williams, Catawba County Schools
Mr. H.L. Moorefield, Jr., P.E., Dewberry & Davis
BA/bsw \\CHARI\CNIL\PROJECTVROJECTS\C7091\CORRESP\PELLEIDOC
Dewberry & Davis

rim
Dewberry & Davis I.ngineers
I'lunnen
Surveyors
November 25, 1998
Mr. Steven Pellei
North Carolina Division of Water Quality
512 North Salisbury Street
Raleigh, NC 27604
RE: AUTHORIZATION TO CONSTRUCT
NPDES PERMIT NUMBER: NC0086304
CATAWBA COUNTY SCHOOLS
EAST CATAWBA MIDDLE SCHOOL
Dear Mr. Pellei:
Consulting Engineering:
600 Lexington Ave.
Charlotte, NC 28203
7 0 ¢ Fax 70 332-. 8
Enclosed are three (3) copies each of the revised Drawings and Specifications for the
above referenced project. In response to preliminary review comments, the following
revisions have been incorporated into the drawings and specifications:
1. The specifications have been sealed by a NC Professional Engineer.
L- 2. System redundancy has been enhanced by using dual alternating pumps for
both recirculation and discharge lines.
,--� A eg nerator receptacle is included in the project to provide astand-by power
source for operating the pump station and disinfection system in the event of a
power outage. A long-term power outage would result in the school being
closed.
✓ 4. The proposed treatment system is not located in the 100 year flood plain
according to FIRM Map 370050 0165B. Please refer to the attached letter
from the Catawba County Zoning Administrator and copies of the Catawba
County North Carolina (unincorporated areas) Map Index.
5. The proposed treatment system is located 100 feet from the nearest spring. It
is further than 25 feet from the drainage ditch located downslope. It is further
than 100 feet from the pond fed by the spring. We believe that all buffer
requirements listed in 2H.0219 have been met.
6. A 110 volt power source is provided on the pump panel as indicated in the
specifications. A potable water source with back flow prevention is shown on
the plans.
Additionally, other revisions have been made to the plans based on our several phone
conversations about this and other projects. These revisions are indicated below:
7. Manhole #5A has been added between manholes #5 and #6.
8. An effluent filter has been added to the second septic tank in series.
9. Clean -outs have been added to the 6-inch distribution piping.
1 irrinia Man land North Carolina California Geon,ia New Jersey Neu NOrk Connecticut Massachuse IIs I'ennsd vania lexas Oklahoma

Mr. Steven Pellei
NC Division of Water Quality
November 25, 1998
Page 2 of 2
10. Ball valves have been added to each lateral line at the sand filter bed.
11. A continuous flow meter with data recorder has been added to the discharge
line.
We are enclosing a detail of the grease interceptor that was photocopied from the
architectural drawings. Design of this component is the responsibility of the
plumbing/mechanical consultant to the architect preparing the school addition/renovation
plans. Also enclosed is a copy of the submittal drawing for the grease interceptor.
Questions should be addressed to me at this office. Due to the compressed time schedule
necessary to complete construction before school starts next fall, we appreciate your
assistance in expediting this review. Thank you for your cooperation.
Sincerely,
Birk Ayer, P.E.
Project Engineer
Attachments
c: Mr. Ernest Williams, Catawba County Schools
Mr. Russell Williams, Catawba County Health Dept.
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THE MILLER
3", 4", 5", 6", 8" Standard Design Single Sewage Siphons
i116M WATER UmF
a'
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�.` Reducer, discharge pipe, and
back vent and overflow, are
a e'
r; .e'• o'' not furnished or sold by Rex
e ;o PFT Division. Vitrified tile
pipe and fittings are generally
y ? used for this purpose.
Approximate Dimensions in Inches and Average Voights in Pounds
Diameter of Siphon .................
A
3
4
5
6
8
Drawing Depth ......................
D
13
17
23
30
35
Diameter of Discharge Head ............
C
4
4
6
8
8
Diameter of Bell .....................
B
10
12
15
19
21
Invert Below Floor ...................
E
4'%
52
7yz
10
9
Depth of Trap ......................
F
13
14'%
23
30'/.
40
Width of Trap ......................
Height Above Floor
G
8-3/8
11
14
16
25-5/1
..................
Invert to Discharge=D+E+K ............
H
1
7'/a
20
113/4
25%z
9%z
33'/z
11
44
16
47
Bottom of Bell to Floor ...............
K
3
3
3
4
3
Center of Trap to End of Discharge Ell ...
L
12%z
14'%
17
19
25
Diameter of Carrier ..................
S
4
4-6
—8
B-10
8-12
Average Discharge Rate G.P.M ..........
72
165
28
474
950
Maximum Discharge Rate G.P.M.........
...
96
227
422
604
1400
Minimum Discharge Rate G.P.M.........
...
48
102 4
234
340
500,
Shipping Weight in Pounds .............
Detail Drawing 1 F
...
...
60
150
210
300
800
...................
...
373
374.2
375
376
378.2p
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for discription of operation. The draft "D" will be 1" to 2" less in this case. Siphons listed
here are carried in stock and can be shipped promptly on receipt of order and payment.
The drawing depth "D" may be reduced in certain cases by special air piping. Contact the
manufacturer for these special applications.
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System Curve Calculations
Dewberry Davis
EAST CATAWBA RECIRC PUMP
C=
120
Force Main Diameter--
3 inch
Discharge Losses=
8.97 ft
Discharge Length=
300 If
Area:--
0.0491 ft^2
HP elevation
50.07
HWL Alarm
35
Pump Off
32.0
Flow
Rate
Dischar a Piping
Static head
TDH
Fittings
Piping
Minimum
Maximum
Minimum
Maximum
(gpm)
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
0
0.00
0.00
15.07
18.07
15.07
18.07
25
0.18
0.82
15.07
18.07
16.07
19.07
35
0.35
1.53
15.07
18.07
16.95
19.95
45
0.58
2.44
15.07
18.07
18.09
21.09
55
0.87
3.53
15.07
18.07
19.47
22.47
65
1.21
4.81
15.07
18.07
21.10
24.10
75
1.61
6.27
15.07
18.07
22.96
25.96
85
2.07
7.91
15.07
18.07
25.05
28.05
95
2.59
9.72
15.07
18.07
27.38
30.38
105
3.16
11.69
15.07
18.07
29.93
32.93
115
3.80
13.83
15.07
18.07
32.70
35.70
125
4.48
16.14
15.07
18.07
35.70
38.70
110
3.47
12.74
15.07
18.07
31.28
34.28
225
14.53
47.88
15.07
18.07
77.48
80.48
240
16.53
53.96
15.07
18.07
85.56
88.56
250
17.94
58.19
15.07
18.07
91.20
94.20
275
21.70
69.41
15.07
18.07
106.18
109.18
280
22.50
71.76
15.07
18.07
109.33
112.33
300
25.83
81.53
15.07
18.07
122.43
125.43
325
30.31
94.55
15.07
18.07
139.93
142.93
350
35.16
108.44
15.07
18.07
158.66
161. 6-
375
40.36
123.20
15.07
18.07
178.63
181.63
400
45.92
138.82
15.07
18.07
199.81
202.81
425
51.84
155.30
15.07
18.07
222.21
225.21
IL 110
1 3.47
12.741
15.07
18.071
31.28
34.28
K-Values
Check Valves
2.50
1
2.50
Gate Valves
0.30
0
0.00
Plug Valves
0.77
1
0.77
Bends
0.30
8
2.40
Tee
1.80
1
1.80
Entrance
0.50
1
0.50
Exit
1.00
1
1.00
Total:
8.97
p:\drafting\c709l\design\syscrv.xls 12:06 PM 9/29/98

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■PU P
T21
NW44N rAmwin WWI
jbivemill ml
NJ
C�►. je � ,;fie...
0 ON.
e
w,?"�"
dfli
lu
RPM: 1750 Discharge 3"
m
S3S
9CD_e�:
okt IQOQo ounnp
)ROMP
u■ IAN L

iL
System Curve Calculations
Dewberry Davis
EAST CATAWBA DISCHARGE
C=
120
Force Main Diameter--
2 inch
Discharge Losses=
5.37 ft
Discharge Length=
10 if
Area=
0.0218 ft^2
HP elevation
41
HWL Alarm
35
Pump Off
32.0
Flow
Rate
Discharge Piping
Static head
TDH
Fittin s
Piping
Minimum
Maximum
Minimum
Maximum
(gpm)
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
0
0.00
0.00
6.00
9.00
6.00
9.00
5
0.02
0.01
6.00
9.00
6.03
9.03
15
0.20
0.08
6.00
9.00
6.27
9.27
25
0.54
0.20
6.00
9.00
6.74
9.74
35
1.07
0.37
6.00
9.00
7.43
10.43
45
1.76
0.58
6.00
9.00
8.35
11.35
55
2.63
0.85
6.00
9.00
9.48
12.48
65
3.67
1.15
6.00
9.00
10.83
13.83
75
4.89
1.50
6.00
9.00
12.40
15.40
85
6.28
1.90
6.00
9.00
14.18
17.18
95
7.85
2.33
6.00
9.00
16.18
19.18
105
9.59
2.80
6.00
9.00
18.39
21.39
90
7.05
2.11
6.00
9.00
15.15
18.15
100
8.70
2.56
6.00
9.00
17.26
20.26
120
12.52
3.59
6.00
9.00
22.11
25.11
150
19.57
5.42
6.00
9.00
30.99
33.99
160
22.27
6.11
6.00
9.00
34.38
37.38
180
28.18
7.60
6.00
9.00
41.78
44.78
200
34.79
9.24
6.00
9.00
50.03
53.03
325
91.87
22.68
6.00
9.00
120.55
123.55
350
106.55
26.01
6.00
9.00
138.56
141.56
375
122.31
29.55
6.00
9.00
157.86
160.86
400
139.16
33.30
6.00
9.00
178.46
181.46
425
157.10
37.25
6.00
9.00
200.35
203.35
450 1
176.13
41.401
6.001
9.001
223.53
226.53
K-Values
Check Valves
2.50
1
2.50
Gate Valves
0.30
0
0.00
Plug Valves
0.77
1
0.77
Bends
0.30
2
0.60
Tee
1.80
0
0.00
Entrance
0.50
1
0.50
Exit
1.00
1
1.00
Total:
5.37
p:\drafting\c709l\design\syscrv.xls 12:06 PM 9/29/98

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MEMBER

tAVV C_A1' ArWt4 AiULE c&hbO(.
' REVIEW AIDE � SAP B63o Z�i6 � �Gb04 AcA
PROPOSED ACTION
CheCK for an Is this action allowed? i6 s
2. Check the permit. Can the proposed system meet the permit limits? y&s
• 3. Check with the regional office. Do they agree with the proposal? VAko P ;u fnrz C_r0&V e'1,,W-
4. For New Sites:' If 7Q10 = 0 cfs & 30Q2 = 0 cfs, Then no new discharge of 02 consuming waste. ki/A
Check flow. Is it in line with our regulations, permit limits, project scope and actual flow data?
CS �r6. Have engineering calculations been provided?
SITE PLAN
1. Does the plan show thouilding, property lines, wells, system components, receiving stream,
dischargespoint, north arrow, and vicinity map?
2. Is the facility above the 100 yr. flood elevation2? �f - e-2 A_P. V r (Ctty- of
3. Does the system maintain the following setbacks (in feet)2? 63 I
hnYJfiiCiTIL wqfc-2 S.II�,.j M�.w��15
distance from / minimum actual O.K.?
WS sources, WS reservoirs, lakes V
drinking wells 100 tidr oN WeLLS
adjacent residence 100 > 260'
place of assembly 100 > too
SA or SB water_ s 1 00_ ti
other streams, marshes, canals _ 50_ _ _ o ��A �� d+k_*1
property lines 50 OD
any building foundation/basement 15 > I o o ' we
�1 NPDES DESIGN FLOW 0� - b/c -
esi n ow Rate Establishment T Scuool uSrD n
6 g Type:
�. Daily Flow2 : 10 gpd/unit x % Sd units = 9-0 D gpd
CAgSV w.E� n,o SGo a► l�S Ov Cw�t'�dv�
COMPONENTS
SEPTIC TANK
1. Nominal Size: q'13 gal � t 1 p x Zu xs
2. Detention Time (meet one of the following):
Nominal detention time:
4- 1 (�_ 10xry ), .r = 9 C[113 10
q a "1 [gal] tank size
(REC. 1 day minimum)3
[gpd] NPDES flow rate = I - S days
Actual minimum detention time: (REC. 0.5 day minimum)4
q q' [gal] tank size (x 1 - 0.3) [gpd] NPDES flow rate x
.3 Peak Flow factor)5 = 0. S days
(note 30% reduction in septic tank vol. for solids accumulation)
PIPING 14 I,v IuS Vew }0.4� p fC
elope from establishment to septic tank: >. o . S "% - (REC. 1 % to 5%)6
2. Is piping located in an area susceptible to vehicular traffic and protected? Dip I( d
3. Are cleanouts and long sweep elbows provided for easy maintenance?
aeW4. ,I �a de#ail of the cleanout provided? ?ks AAW pot,
DISTRIBUTION BOX (If applicable) tlklA
1. s a detail of ffi-eFffox provided?
2. Is there a way to divert flow from one line to the other?
3. Is there a way to ensure equal flow from to each line?
L-SYSTEM HEAD,,-
1.
Gravity System (If applicable):
Is there sufficient head to promote flow? Y ES (TYP. > 3.25 ft)l
INC Admin. Code 213.0206
2NC Admin. Code 2H.0219
3EPA On -site WWI- & Disposal pg. 101
4Metcalf & Eddy example page 1061
5see Metcalf & Eddy Peaking factor from 8 to 1(pg. 1020), per EPA1625/R-921005 pg. 45 use Peaking Factor of 3
61HS Tucson Area Office Technical. Provisions
tRecirc Sand Filters Checklist 1128198 draft SDP 11
v L) �r•Qo, �.� 1'rP� • � t� 4�jy �►1�0.`�, �en,��AL'� �� ) �1 A �j �
Z

y
2. Pumped System (If applicable): (TYP. 3 to 5+ ft)2
Are dual pumps provided3? YEs
Are pumps sized to handle flow & head? old
What is the method of pump control? FLacr 'twlrcka-
- J Is a pump curve provided?
Can the amount dosed on each zone be easily adjusted in the field? y64
Is there some measure to prevent pump overheating (ensure positive suction pressure)
and pressure surges?4
Have check valves and manual valves been installed on the discharge side of pumps? ycl
,Does the system have a high water alarm? Yes
AZ SAND FILTER BEDS�A�
cco (1 '0?)
!U1 _ 1. BedSizes: 2 beds @2 4 ft x `- 25 ft EA. = 2.3 d 4 sf
2. Design Criteria5:
1.
FACTOR
UNIT
RANGE
TYPICAL
THIS DESIGN
OK7
Media: effective size
mm
1.0 to 5.0
3.o
I • --0 S
✓
ni . Goeff
LIG
< 2.5
2.0
z.3
dust content
< 0.5%
0, S"
t�
Depth
in
A 2 to
Vol
y rau is oa ing
gpd/st
3 to 5
4
2. Z
Organic Loadin§
0.002 to 0.008
< 0.005
ecirc Ratio
ec: wr
o
2:
Dosing Time
min min
o lu
4
17
PRESSURE SYSTEMS
Daily Application Rates:
Recirculating Filter:
0-00 [gpd] NPDES Flow rate
f050 & IS , eJ(S-, n ,4 : 2 304 =
Calc. Total filter Flow [gpd]:
Recirc Ratio: Z , 1
(Use < 5.0 gpd/S07
2 0 4- [sf] filter area = 2. &2 gpd/sf ✓
4, Z2
(Use =< 3:1 ratio)$
[gpd] NPDES Flow rate x (recirc ratio + 1) = I q 570 0 [gpd]
Calc. Volume per Dosing Cycle: v 6 1. 0110
1 ky [gpm] pump cap. x _ �. �s [min.] pump cycle = 6 4- gal/cycle
Calc. Number of Cycles per day:
o 000
[gpd] Tot filter flow _ br, ¢ [gal/cycle] Vol. per cycle = I s
Calc. Flooding depth per dose (if applicable): (REC 2 in. min)9
b6 4- [gal/cycle] Vol. per cycle = 230 4- [sf] filter area (x 1.6)10 = Q. 9 in
2. Required Dosing Tank Size : (choose the larger of the following) = 121 91 gal pvv; -4d
i. NPDES Daily Flow Rate-.:-- Dosing frequency [doses/day] GSoo i S = 33
ii. Volume per dose 12 t
iii. 1 day detention time'
1 EPA/625/R-92/005 p 70
`
2from Metcalf & Eddy p 1066;
��
0. In 6
D 3
3There are exceptions for SFRs. They are not required to have dual pumps, but encouraged.
�(�
4
0.2 Z
4Ensure adequate motor HP, eliminate possibility of pumping against closed valves.
5from Metcalf & Eddy p 1066;
D- 4 4
0. 2 9
0- f 4�
6Policy on NPDES Permits for Existing Schools MEMO Mar. 15, 1994; EPA/625/R-92/005 p71; NEHA On -Site rec. 24'
0.21
o. 14
U,
7for forward flow: NC DEM NOI for NCG550000; 3 to 5 gpd/sf from Metcalf & Eddy, WW Eng. p. 1066
0 k i S
0,13
U , p 6
8NC DEM NOI for NCG550000; 3:1 to 5:1 from Metcalf & Eddy WW Eng. p 1066
.
Q 0�
0 0 4
9EPA On -Site pg.127
D 13
101.6 = (12inches/foot) + (7.48 gallcf)
0, ®t
11Hines & Favreau, III. DPH
Recirc Sand Filters Checklist 1128198 draft SDP
r--
0'�

3. Dosing Method: (circle a or b) surface flooding
spray nozzles/orifices
DISTRIBUTION & COLLECTION LINES
4. Distributionlines:Size: Z in. (REC. 1 to 2 in.)1
^/2. Underdrain lines (typ. 101o.c.): Size: II in. (REC. 3 to 6 in.)2
Slope: I :-U % (REC. 0 to 1 %)3
-3. Are pipes embedded in gravel or crushed rock (typ 6")? \/Es
­14. Are ends of collection lines plugged, capped, or vented (for aeration) to the surface? yCS'
5. Is there a provision to drain exposed piping or is freeze protection provided? '
Provisions should be made for the adjustment of flow at each discharge point or line. ref —VALvft
Are elevations set to ensure proper flow from component to component? YeS
8. Are splash slabs required and installed? N/A
Provisions should be made for the adjustment of flow at each discharge point or line. IC-1 v6iL'e'�
DISINFECTION
or Are dual units provided? Vbbv%_F3
Have manufacturers literature been provided? P`WA,- cbk� -
For Chlorine contact: Method of Chlorine application:
Detention time in the Contact Chamber: hrs (>= 0.5 hrs)
If there is a TRC limit, has dechlorination been provided?
�► DISCHARGE Jeta,;1A �90 l2(2-#/I V0
Has the neea for energy dissipating devices or erosion reduction measures (i.e.: riprap) at the point of
discharge been investigated?
FREEZE PROTECTION 0I4-
ny pipe & components exposed to air may be subject to freezing, especially full & press pipes.
1. If drain -back valves are proposed
is a detail shown?
Are drains placed to ensure flow to the drain and emptying the pipe?
Are pipes sloped back towards the drain?
2. If special drain lines are utilized, ensure they do not pressurize other lines during pumping.
OPERATION, MAINTENANCE AND REPAIR
�-Effluent Samples. Can these be easily collected? b
..below all of the treatment processe§?
Meters and valves. Have manufactures literature been provided? 01k
Are ranges of operation acceptable?
Will they be installed in boxes for easy access?
Bypass lines. are not allowed except in extreme circumstances. Nt4
Are any by-pass lines proposed? ►✓o
In what instances will the system by-pass?
Do floor and freeze drain lines return to the dosing tank, recirc tank or sand filter? Y�,l'
Do floor drain have a water trap? No
�- Can tanks be isolated with out threatening treatment? (Install a manual valve on outside of tank) �S
Is the facility protected from public access? Are pumps etc. in lockable containers?
LOST POWER ` E,,�,,,� T v,,�I�,��s'. st�ov( 'r "'JC 1'C--D s,o
n case o os power,
-y �1.)� Does the facility continue to produce wastewater?
Is auxiliary power supplied? Not . How is it activated?
.) Can effective treatment be achieved?
4.) or wastewater stored? For how long? ,
5.) Is there an automatic emergency call up system? (�JuTh Qi QlL vp -
Igravity lines, NEHA On Site; 1 to 2 in. pressure lines, Metcalf & Eddy, WW Eng. p1066;
2Metcalf & Eddy, Wastewater Engineering p1066
3Metcalf & Eddy, Wastewater Engineering p1066
Recirc Sand Filters Checklist 1128198 draft
SDP