NC0069761_Review Comments Response_20160606

WEST-cite 405 South Sterling Street,Morganton NC 28655
CONSULTANTS v[ec 828 433 5661 / fax [phone] / [e-mail]
June 2, 2016
Mr. Ron Berry, P.E. REGENEDINCDE°MWR
NCDEQ—DWR/NPDES 0 s 2M61617 Mail Service Center JUN
Raleigh, NC 27699-1617water Q Seri on
pe ffnittm9
RE: Review Comments Response
Beech Mountain Pond Creek WWTP Improvements Project
ATC Request—NPDES NC0069761
Dear Mr. Berry:
The following are responses to your review comments e-mail dated May 9, 2016:
1) The 700 gallon Mg Hydroxide tank is located in a building. What is the containment plan?How will
the tank be filled?
There is not a specific containment plan as Mg hydroxide is not toxic,or hazardous(a MSDS was
included with the application). If aqueous Mg hydroxide were to be uncontained,there are four
drains that are within about 10' of the proposed tank location,with the closet being within 5'as
shown on Plan Sheet 2. These drains feed into 4" piping,which feed into a 6" line that discharges
into a manhole at the head of the plant as shown on the schematic. The enclosed as-built drawing
shows the drain system,which was constructed for the dewatering sludge press, under the building
slab. There would be no environmental contamination resulting from a spill as it would be
contained within the building and subsequently discharged to the head of the plant.
Dry Mg hydroxide and water will be added manually to the tank and mixed to make an aqueous Mg
hydroxide. A platform is shown on Plan Sheet 2 to enable the operator to safely dispense the dry
Mg hydroxide,as well as to access the mixer as needed.
2) The design calculation used 25 mg/L as the average ammonia as nitrogen influent concentration.
Would like to see the data used to develop this average.
For the year 2014,the Owner did in-house testing to determine the ammonia influent
concentration. However,the testing did not result in meaningful data. Since the results were
unusable and the plant does not experience a serious ammonia issue, 25mg/L was used,which
represents a medium ammonia concentration per Metcalf& Eddy, 3RD Edition. The Owner recently
took influent samples(5/11-5/13 and 5/16/16)and sent the samples to Watertech Labs to
determine the NH3 concentration. The results(enclosed)justify the use of 25 mg/L since the
average of the four days was 16.75 mg/L as shown the next page. The Owner is confident the values
represent normal wastewater strength, i.e. not diluted by stormwater,which the table bears out
since there was little to no rain during the sampling days.

Mr. Ron Berry, PE
June 2,2016
Page 2
Date NH3 Flow(mgd) Rain(In)
5/11/16 18.75 0.061 0.2
5/12/16 10.25 0.088 0.3
5/13/16 12.50 0.064 0.3
5/16/16 25.50 0.051 0.0
Average: 16.75
In addition to e-mail, if you have additional questions or clarifications,feel free to contact Ron Lynn at
[phone],or myself at(828)522-4728.
Sincerely,
WEST CONSULTANTS, PLLC
Benjamin B.Thomas, P.E.
Enclosures
cc: Ed Evans,Town Manager

NMTER$TECH LAOS Inc.
POST OFFICE BOX 1056 • #5 PINEWOOD PLAZA DR.
GRANITE FALLS.NORTH CAROLINA 28630
[phone]
SAMPLE: Pond Creek INF COLLECTION DATE: 5/11/2016
PERMIT#: COLLECTION TIME: 08:00
ADDRESS: RECEIVED DATE: 5/17/2016
RECEIVED TIME: 12:30
REPORTED: 5/19/2018
ANALYSIS
ANALYSIS RESULTS UNITS DATE ANALYST
NH3 18.75 mg/L 5/19/18 jrg
LOG ID: 1805-275 REPORTED BY: NCCERTIFIEDLAB#50
Tony Gragg,Lab Supervisor

MATERMTECH LABS Inc.
POST OFFICE BOX 1056 • N5 PINEWOOD PLAZA OR.
GRANITE FALLS.NORTH CAROLINA 28630
[phone]
SAMPLE: Pond Creek INF COLLECTION DATE: 5/12/2016
PERMIT#: COLLECTION TIME: 08:00
ADDRESS: RECEIVED DATE: 5/17/2016
RECEIVED TIME: 12:30
REPORTED: 5/19/2016
ANALYSIS
ANALYSIS RESULTS UNITS DATE ANALYST
NH3 10.25 mg/L 5/19/16 jrg
LOG ID: 1605-276 REPORTED BY: NC CERTIFIED LAB#50
1
Tony Gragg,Lab Supervisor

4IRTERITLCH LANRI".
POST OFFICE BOX 1056 • N5 PINEWOOD PLAZA DR.
GRANITE FALLS,NORTH CAROLINA 28630
(828)3964444
SAMPLE: Pond Creek INF COLLECTION DATE: 5/13/2016
PERMIT#: COLLECTION TIME: 08:10
ADDRESS: RECEIVED DATE: 5/17/2016
RECEIVED TIME: 12:30
REPORTED: 5/19/2016
ANALYSIS
ANALYSIS RESULTS UNITS DATE ANALYST
NH3 12.50 mg/L 5/19/16 jrg
LOG ID: 1605-277 REPORTED BY: NC CERTIFIED LAB#50
ft,
Tony Gragg,Lab Supervisor

MATEROTECH LANS in,
POST OFFICE BOX 1056 • 05 PINEWOOD PLAZA DR.
GRANITE FALLS, NORTH CAROLINA 28630
(828)3964444
SAMPLE: Pond Creek INF COLLECTION DATE: 5/16/2016
PERMIT#: COLLECTION TIME: 09:30
ADDRESS: RECEIVED DATE: 5/17/2016
RECEIVED TIME: 12:30
REPORTED: 5/19/2016
ANALYSIS
ANALYSIS RESULTS UNITS DATE ANALYST
NH3 25.50 mgIL 5119/16 Ire
LOG ID: 1605-278 REPORTED BY: NC CERTIFIED LAB#50
•rpsoiii
Tony Gregg,Lab Supervisor

' 21-6- I�IGG!!!�+a..!T,,��
r-Y 9'-Y w-10. S•-+• r-11• TE O T. SLOVEN IT AMA R TO 6F RELOCATED FROM EXISTING BURDNG NN REwNFD. ' �..yy�
/-Y M .D¢1TRAC1DE TO CONSTRUCT EQUP1EMT PMS SET ANOCRA BOLTS TO MATO. �]E"11Lf1,M,P
b/ EX.EWIRPNT. PRONOE•LLA TBSC RPE!RT1MC5 IS REOUMED GMy(, ,yP
1 INSTALLATION 5 V
II H II - I - z NA NNP tc m BE UNARM DUCTILE IRON PPE NTH NW TEPP.GASKET
MATERIAL SUITABLE FOR COMPRESSED AR.
® t0'w x IO ROLL UP DOOR ^ I3. O.DOM I ® m w.+a®L w DOOR ' a ONE GLOVER SHALL REAM R SEANCE AT ALL RYES PURMO CONSTRUCTION. Z W Z
0 ® RPMQ PADS AND ELEL'1RICAL WORK MALL BE C000IAIW TO 4NNIIE Z O
^ + e
SLOVEN DOWNTIME. - z Z
ERG EYE 4. X W.A1ERED WAGE HOPPERS SHALL BE 3/4 CY CAPACITY.SELF OWINGW
EW -I W
DESIGN. PRM PTH STANDARD FOOPENNGS. HOPPER SMALL BE RATED FOR NOT z a_
5 n MA91n+10FER�' LESS THAN 4000/CAPACITY.HOPPER SHALL BE FABRICATED DICE 3/16'
DEwATERm STEEL PLATE MTl RENFORaNC AS
NECESSARY.FOUR 8X2•POLYURETHANE Q {a o
SL HOPPER ZZ
BE PRIMED AND
NCASTESHALL HOOPER• I U W
4FD RN
JQ
Y'-- —_ PRONOC 2 HOPPERS 0
TIE CO r S PRONE SUPPORTS AS READ TO PREWNT PIPING LOADS RMM BEND
oBCRj ;% �` r FD J TRNgrnE2 TO EQ IP4EHT FLANGES.
CO
^p� I •. !D- S. PRUNAE a PANEL ELDEST RTE RIR EAO1 BLURB. HOUSINGS SHALL 92_:,Ej
11 i NN I' +' HOSE BIBS BE MS CO STEEL CONSTRUCTION FOR OUTDOOR USE MEATIER HOODSSHas y
n ;-L X _ •]T�'' _ ACES
SHALL BBE PRIMED FOR
FACTORRY ACCESS
IS ED PROVIDE FABRICAAll TED STEEL J }' N
<(• 1� 1��
SUPPORTS FOR WAKE PIPING ANCHORED TO A CONCRETE GCOIMVS • J --a
n / ,,y000( -. '-' ). REFER TO DETAL PAGE(SHEET 13)FOR DOOR SOEDULE W c
EQUIPMENT SND W/ Y<((((`(C((((<(' •V r a DUMP PALLET SHALL BE CONSTRUCTED OF HEAVY maw POL ElM1LENE.AND 0 r y'f
CHECKER PLATE ^F. < <( ( II1.-0I'�
FI <R(<( ' M 1 9ffP FOR 2 DRUMS. A ONS BNTO PROVE 55 GALLONS OF SECONDARY i v A
9 v c <(C'.M. BELT PRESS CONTAINMENT. PROBE A RAMP TO LOAD ALIO UNLOAD ORAL F
8 e e < ((k( (' MPJ e i I-
4•METAL STUD n yyc(k ' ` I `a
WALL ENTAL - IL I .,/,-;
'' I
PLN UNE n( Y
CONTROL PANEL •
n lel{IN�.) illg
N
GLOVER/2 BLOWER n II;� 9
PI
OPPRESSOR �\ q
�� r' _I POLDER DRUM n Q 1 d S F 3
- sun BMP '}�1TImim l� O (BY OSTER) •
n b ! F r p
..E SUPPORT BBL -
11EIE,:_.r_•• • UI `DRW PALLET Y
SEE NOTE n T I-' _-� _.1._I RE PTE 6 1?' le ; p! 9 ®p$
I.
FLEX -� n a-a• 1 : Mr-0• 6•-10r a E L D
6•cv 1.11." �' r� % '" ' GRINDER Eli 2•NPRIN
6• ' — I, - .PPE SAVORY
4.
tY N_ a-,- I�'_ -, Imo,_ n / BELOW FT.D A I CO NMM�1El ill M.1� D • /�
III{F{l i SLOPE TO DRAIN 4 P DS —�t/V�/�Y-
1 - 3 a. E%
R ��,
MAG-METER
' r ry ' IOE r II T PPE SUPPORT.TW t
IN'-K 4'-6• S24'-0• is
NONE RTER/••I. -
SEE NOTES
PLAN — DEWATERING BUILDING BLDG FRAME(BEYOND) 1-
2
3/13..1*-C/ J
1■ d
J - _ ___ ___ I Z W
R I IIII
~ a Z so
4•YETI SILO WNL I I fr.reW O Z
EXPOSED," RACIAL PANEL UNER I I v 5_15
O_
/MSULATION RILL HET.BOTH SIMS—. PRE-E BLDSEEAEO I I E CC m I_
I
I = W c3
I CONTROL PAM€I I U 0
w
'N I W Z N
METAL PANEL LINER"' �' ."��I\?.• Q
W NGT.ALL EXT.WALLS
W
3.F - T CAKE ONTE `,,��. .�v I O co Q
j RNFSER // A\eI/..-�i11a .w1I) ' I Q TS (L
,_i`I�I� I I 3 3 0
.; I I 11, I CPV I. O Y
EE
G
EU
ii rd Z
.� a Yj AN RA 3726 00 �_� 37IB a_
•• J _ �I_I 6•EOIIPYENT PM J 17
r I L .. a•alGlF VIIM SARI lEA I -I..."�1la 4•FD e+ o PFA rt. u 0) .*.sLUOGE
a•0 a 2.0E Y RimI it
BEET Pb,
c a n2z)6 +2•DP AN / FD L G0.
' — CD SECTION (`P NY. 37230 O SECTION PARTIAL O
29 I P.... I