NC0025534_Headworks Analysis_20191204

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CITY OF HENDERSON
Water Reclamation Facility
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Post Office Box 1434
pti~' Henderson,North Carolina 27536-1434
47 tKA
• Phone: [phone] FAX: [phone]
Shipping Address-1646 West Andrews Avenue,Henderson NC 27537
RECEIVED
DEC 11 2019
December 4th, 2019
NCDEQIDWRINPDES
CERTIFIED MAIL-RECEIPT REQUESTED
MONTI HASSAN
PERCS UNIT
NC DIVISION OF WATER RESOURCES
1617 MAIL SERVICE CENTER
RALEIGH,NC 27699-1617
Re: Revised Long Term Monitoring Plan
Dear Mr. Hassan:
Enclosed is a revised LTMP for the City of Henderson WRF with changes reflecting the lower PQLs for
Arsenic, Cadmium, Lead,Molybdenum,Nickel, Selenium and Silver required under the Dissolved Metals
Water Quality Standards. In addition Total Phosphorus, COD and TKN were lowered to meet the NC
DENR Chemistry Lab PQLs.
If you have questions or need additional information please contact me at 252-431-6085 or Lamont Allen at
252-431-6081.
Sincerely,
)s)4,-/--4()
Darrel Johnson
Pre-treatment Coordinator
City of Henderson WRF
C: Lamont Allen,HWRF Director
LTMP File

City of Henderson
Headworks Long Term Monitoring Plan
A. Sampling Points(See Figure 1)
1 - Influent+Filter Backwash and Thickener Filtrate-use regular composite sample
collected for NPDES monitoring
1 a- Filter Backwash+ Sludge Thickener Filtrate
2 - Effluent-after all treatment including UV disinfection-use regular composite
sample collected for NPDES monitoring
3 - Oxidation Ditch-collect a grab sample.
4 - Sludge to Disposal -sample sludge going to final disposal
5 - SIUs—locations described in lUPs
6 - Uncontrollable—collect composite samples at pump stations that serve residential,
commercial(including dentists and other medical),and any unpermitted non-
SIUs. Sampling will be rotated between 4 pump stations annually with one pump
station sampled each quarter one year before Headworks Analysis.
B. Pollutants of Concern(P.O.C.) Reason for Inclusion:
NPDES -POTW NPDES Permit limit
Sludge-40 CFR 503 Sludge Land Application
EPA-EPA Required
IUP - S1U Industrial User Permit Limit
POC NPDES 40 CFR 503 Sludge EPA,NC SIU
List Required Required Required Limited
Pollutants Pollutants Pollutants Pollutants
Flow Flow Flow
BOD5 BOD5 BOD5
TSS TSS TSS
NH3 NH3
As As
Cd Cd Cd Cd
Cr Cr
Cu Cu Cu Cu Cu
Pb Pb Pb
Hg Hg
Mo Mo
Ni Ni Ni
Ag Ag
Se Se Se
Zn Zn Zn Zn
T PHO S TP TP
TKN TKN
Oil&Grease Oil&Grease
% Solids % Solids
Sludge to Sludge to disposal
disposal flow flow
COD COD
Page 1

City of Henderson
Headworks Long Term Monitoring Plan
C. Flow
Flow monitoring points are indicated on the attached facility diagram, see Figure 1. Flow at
SIUs will be monitored during sampling events. Flow or volume of sludge to disposal(Pt. 4)can
either be monitored or calculated.
D. SIU Monitoring
Significant Industrial User monitoring will be conducted per industrial user permits(IUP).
Additionally, extra SIU sampling will be performed such that all SIUs are sampled for all LTMP
POCs at least once per year.
E. LTMP Sampling Frequency
Sampling Point Normal 1 Year Before HWA
1-Influent Quarterly on a Workday and Monthly on a Workday and
per NPDES requirement per NPDES requi
rement
1 a Filter Backwash plus Minimum of 2 sampling
thickener filtrate events
2—Effluent Quarterly on a Workday and Monthly on a Workday and
per NPDES requirement per NPDES requirement
3—Oxidation Ditch Once per six months
4- Sludge to Disposal Per Sludge Permit and Per Sludge Permit and
503 regulations 503 regulations
5 -SIU's Per SIU Permit Per SIU Permit
and all POC's once per year and all POC's once per year
6—Uncontrollable Quarterly
Page 2

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City of Henderson
Headworks Long Term Monitoring Plan
G. Detection Level and Sample Method
P.O.C. Detection Level(mg/1) Sample Method
BOD 2 24 hr Composite
TSS 2.5 24 hr Composite
NH3 as N 0.1 24 hr Composite
As 0.002 24 hr Composite
Cd 0.0005 24 hr Composite
Cr 0.005 24 hr Composite
Cu 0.002 24 hr Composite
Pb 0.002 24 hr Composite
Hg-effluent 1 ng/1(method 1631) Grab
Hg-all other 0.0002 (method 245.1) 24 hr Composite
locations
Mo 0.01 24 hr Composite
Ni 0.002 24 hr Composite
Se 0.001 24 hr Composite
Ag 0.001 24 hr Composite
Zn 0.01 24 hr Composite
T-Phos 0.02 24 hr Composite
TKN 0.2 24 hr Composite
Oil&Grease 5 Grab
COD 20 24 hr Composite
Sampling,preservation, and analytical method must be from 40 CFR 136.
Page 4

CITY OF HENDERSON WRF DIAGRAM Figure 1
WITH SAMPLING POINTS LABELED coo
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a
1 ANAEROBIC ANOXIC
—BASINS
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