HomeMy WebLinkAboutNCS000548_Draft Permit Fact Sheet_20150306DENR/DEMLR
FACT SHEET FOR NPDES STORMWATER PERMIT DEVELOPMENT
NPDES Stormwater Permit NCS000548
BACKGROUND
Duke Energy's Marshall Steam Station is a coal fired steam electric plant in Catawba County. The
commercial operation of the facility began in 1965. Three historical stormwater outfalls have been
abandoned in place: SW005, SW008A, and SWO10 per info submitted by the company dated
October 9, 2014.
In addition to NPDES wastewater discharge permit NC0004987, the facility also holds air permit
#03676T49 and hazardous wastes permit NCD043678879. The facility is subject to federal
requirements of 40 CFR §423 - Steam Electric Power Generation. This category is subject to federal
NPDES stormwater discharge permit requirements per 40 CFR §122.26 (b)(14)(vii).
The company originally applied to the Stormwater Permitting Program (SPP) for a separate NPDES
stormwater discharge permit for this facility in March 2011, with an amended application in June
2011. A draft permit was proposed and sent to public notice in July 2011. A subsequent revised
draft went to the company in March 2012 but was never re -noticed or finalized. In October 2014, in
response to NCDENR actions following the coal ash spill at the Dan River Steam Station in Eden, NC
earlier that year, the company re -submitted complete materials to again request a Stormwater
discharge permit. The new proposed draft permit is based on more recent site activity information,
sampling results, and visits by NCDENR staff.
This facility discharges to the Catawba River (Lake Norman). Lake Norman is not impaired, but
there is a statewide total maximum daily load (TMDL) for mercury (Hg), approved in September
2012. No specific reductions or Hg limits are required from NPDES stormwater permittees at this
time.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 1
Facility Information
Applicant/Facility Name:
Duke Energy Carolinas, LLC - Marshall Steam Station
Applicant Address:
P.O. Box 1006, Mail Code EC13K; Charlotte, North Carolina 28201
Facility Address:
8320 East NC Highway 150, Terrell, North Carolina 28682
Permitted Flow:
N/A Stormwater Discharges Only)
Industrial Activities:
Primary SIC Code: 4911 - Electric Services
Permit Status:
New NPDES Stormwater Permit
County:
Catawba County
Miscellaneous
Receiving Stream:
Catawba River
Lake Norman
Regional Office:
Mooresville
Stream Classification:
WS -IV, B, CA
State Grid USGS Quad:
Lake Norman North
303(d) Listed?
Hg, statewide
Permit Writer:
K. Pickle
Subbasin:
03-08-32
Date:
March 6, 2015
Facility Location: Lat. 35'35'50"N Long. 80° 57'52" W
BACKGROUND
Duke Energy's Marshall Steam Station is a coal fired steam electric plant in Catawba County. The
commercial operation of the facility began in 1965. Three historical stormwater outfalls have been
abandoned in place: SW005, SW008A, and SWO10 per info submitted by the company dated
October 9, 2014.
In addition to NPDES wastewater discharge permit NC0004987, the facility also holds air permit
#03676T49 and hazardous wastes permit NCD043678879. The facility is subject to federal
requirements of 40 CFR §423 - Steam Electric Power Generation. This category is subject to federal
NPDES stormwater discharge permit requirements per 40 CFR §122.26 (b)(14)(vii).
The company originally applied to the Stormwater Permitting Program (SPP) for a separate NPDES
stormwater discharge permit for this facility in March 2011, with an amended application in June
2011. A draft permit was proposed and sent to public notice in July 2011. A subsequent revised
draft went to the company in March 2012 but was never re -noticed or finalized. In October 2014, in
response to NCDENR actions following the coal ash spill at the Dan River Steam Station in Eden, NC
earlier that year, the company re -submitted complete materials to again request a Stormwater
discharge permit. The new proposed draft permit is based on more recent site activity information,
sampling results, and visits by NCDENR staff.
This facility discharges to the Catawba River (Lake Norman). Lake Norman is not impaired, but
there is a statewide total maximum daily load (TMDL) for mercury (Hg), approved in September
2012. No specific reductions or Hg limits are required from NPDES stormwater permittees at this
time.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 1
WHY THIS FACILITY IS SUBIECT TO A PERMIT
Federal NPDES regulations define stormwater discharge associated with industrial activity in
40 CFR §122.26 (b)(14) as:
"the discharge from any conveyance that is used for collecting and conveying storm water
and that is directly related to manufacturing, processing or raw materials storage areas at
an industrial plant. The term does not include discharges from facilities or activities
excluded from the NPDES program under this part 122. For the categories of industries
identified in this section, the term includes, but is not limited to, storm water [sic]
discharges from industrial plant yards; immediate access roads and rail lines used or
traveled by carriers of raw materials, manufactured products, waste material, or by-
products used or created by the facility; material handling sites; refuse sites; sites used for
the application or disposal of process waste waters (as defined at part 401 of this chapter);
sites used for the storage and maintenance of material handling equipment; sites used for
residual treatment, storage, or disposal; shipping and receiving areas; manufacturing
buildings; storage areas (including tank farms) for raw materials, and intermediate and
final products; and areas where industrial activity has taken place in the past and significant
materials remain and are exposed to storm water. For the purposes of this paragraph,
material handling activities include storage, loading and unloading, transportation, or
conveyance of any raw material, intermediate product, final product, by-product or waste
product. The term excludes areas located on plant lands separate from the plant's
industrial activities, such as office buildings and accompanying parking lots as long as the
drainage from the excluded areas is not mixed with storm water [sic] drained from the
above described areas."
As a result of the on-going generation of electrical power at Marshall, all stormwater-only
discharges from the above named areas at the facility meet the definition of stormwater discharge
associated with industrial activity.
PROPOSED MONITORING FOR STORMWATER DISCHARGES
The Division considered potential pollutants from the regulated industrial activities as well as data
submitted in both October 2014 and December 2014. Single samples at seven outfalls included
measurements of 0&G, COD, Cl, Fl, SO4, Hg, Al, As, Ba, B, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Pb, Se, Sb,
TI, Zn, TDS, TSS, conductivity, hardness, and pH. The previous application from 2011 included
analyses from a single outfall for a similar, but slightly different, suite of parameters. See attached
information for sampling results.
Unlike most stormwater permits in its program, the Division is proposing a permit structure with
outfall -specific monitoring for discharges. The Division considered including parameters based on
anticipated potential pollutants in the drainage area and on the sampling results. Below is a table of
the proposed monitoring for each outfall at the Marshall site. All outfalls ultimately discharge to the
Catawba River (Lake Norman).
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 2
Stormwater Discharge Outfall (SDO) Monitoring
SW001, SWO01A, SW002, SWO03
Draining the miscellaneous materials storage areas along the intake canal.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from gravel
la down area and BMP effectiveness indicator.
pH
Semi-annual monitoring. BASIS: Pollutant indicator and important to
interpreting toxicity potential of metals.
Priority Pollutant Metals Ag, As,
Semi-annual monitoring only if coal or coal ash transported through this
Be, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Tl,
drainage area. BASIS: Coal combustion waste (CCW) constituents are
and Zn.
currently present in the adjacent Ash Silos area. Roads crossing these
drainage areas may incur, or may have incurred, ash truck traffic.
Boron
Semi-annual monitoring only if coal or coal ash transported through this
drainage area. BASIS: CCW constituent coal tracer.
SWO04
Draining a portion of the Ash Silos area into the intake canal.
Polychlorinated Biphenyls (PCBs)
Semi-annual monitoring; may be discontinued after the first year
(two samples) if not detected. BASIS: Electrical equipment in this
drainage area may have contained PCBs, which persist in the
environment if ever released. If all PCBs have been removed and past
releases cleaned up, these compounds should not be detected.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
pH
Semi-annual monitoring. BASIS: Pollutant indicator and important to
interpreting toxicity potential of metals.
Priority Pollutant Metals Ag, As,
Semi-annual monitoring. BASIS: CCW constituents are present.
Be, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Tl,
and Zn.
Boron
Semi-annual monitoring. BASIS: CCW constituent coal tracer.
SW005
Previously draining into the intake canal.
Abandoned in place; applicant reports no discharge.
SWO06
Draining the northern portion of the Warehouse roof and yard into the intake canal.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
H
Semi-annual monitoring. BASIS: Pollutant indicator.
SWO07
Draining the switchyard, Powerhouseyard, rail lines, and areas extending west to the gypsum haul road, all into
the intake canal. The lar est single stormwater discharge sub -drainage area on the site.
Polychlorinated Biphenyls (PCBs)
Semi-annual monitoring; may be discontinued after the first year
(two samples) if not detected. BASIS: Electrical equipment in this
drainage area may have contained PCBs, which persist in the
environment if ever released. If all PCBs have been removed and past
releases cleaned up, these compounds should not be detected.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
pH
Semi-annual monitoring. BASIS: Pollutant indicator and important to
interpreting toxicity potential of metals.
Non -polar Oil & Grease (1664
Semi-annual monitoring. BASIS: Potential pollutant from lubricants;
SGT -HEM)
Method 1664 SGT -HEM targetspetroleum-based 0&G.
Priority Pollutant Metals Ag, As,
Semi-annual monitoring. BASIS: Rail lines hauling coal are present in
Be, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Tl,
the drainage area.
and Zn.
Boron
Semi-annual monitoring. BASIS: Coal tracer.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 3
Stormwater Discharge Outfall (SDO) Monitoring
SWO08
Draining a small area (0.1A) east of the Powerhouse into the intake canal.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
pH
Semi-annual monitoring. BASIS: Pollutant indicator.
SWOO8A
Previously draining into the intake canal.
Abandoned in place; applicant reports no discharge.
SW009
Draining a portion of the Powerhouse roof, Precipitators 3 and 4 roof, trailer and laydown areas, all draining
into the intake canal.
Polychlorinated Biphenyls (PCBs)
Semi-annual monitoring; may be discontinued after the first year
(two samples) if not detected. BASIS: Electrical equipment in this
drainage area may have contained PCBs, which persist in the
environment if ever released. If all PCBs have been removed and past
releases cleaned up, these compounds should not be detected.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
H
Semi-annual monitoring. BASIS: Pollutant indicator.
SW010
Previously draining into the discharge canal.
Abandoned in place; applicant reports no discharge.
SW011
Draining the raw water storage tank area into the discharge canal. Applicant reports historical sandblasting
and repainting of the raw water storage tank. Limestone and gypsum conveyors cross the drainage area.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
pH
Semi-annual monitoring. BASIS: Pollutant indicator and important to
interpreting toxicity potential of metals.
Cadmium (Cd)
Semi-annual monitoring. BASIS: Potential constituent of paint
pigments applied or removed by sandblasting.
Chromium (Cr)
Semi-annual monitoring. BASIS: Potential constituent of paint
pigments applied or removed by sandblasting.
Lead (Pb)
Semi-annual monitoring. BASIS: Potential constituent of paint
pigments applied or removed by sandblasting.
Zinc (Zn)
Semi-annual monitoring. BASIS: Potential constituent of paint
pigments applied or removed by sandblasting.
SW012, SW012A, SW023
Gravel yard areas north and west of the FGD installation draining to the intake canal.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
H
Semi-annual monitoring. BASIS: Pollutant indicator.
SW022
Draining a gravel laydown area and FGD access road area into the discharge canal.
Total Suspended Solids (TSS)
Semi-annual monitoring. BASIS: Potential pollutant from drainage area
and BMP effectiveness indicator.
pH
Semi-annual monitoring. BASIS: Pollutant indicator.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 4
STORMWATER BENCHMARKS AND TIERED RESPONSE
Rather than limits, North Carolina NPDES Stormwater permits contain benchmark concentrations.
Stormwater benchmarks are numerical action levels for stormwater monitoring. Benchmarks are
not effluent limits, and benchmark exceedances are not permit violations. Benchmarks
provide facilities a tool for assessing the significance of pollutants in stormwater discharges and the
effectiveness of best management practices (BMPs). Benchmark concentrations are intended as
guidelines for the facility's development and implementation of the Stormwater Pollution
Prevention Plan (SPPP).
Benchmark exceedances require the permittee to increase monitoring, increase management
actions, increase record keeping, and/or install stormwater BMPs in a tiered program. The permit
establishes a tiered approach to specify actions the permittee must take in response to analytical
results above benchmark concentrations (Part II, Section B., following Table 11 in the permit). The
tiered structure of the permit provides the permittee and NCDEMLR wide flexibility to address
issues that may arise with one or more parameters and/or outfalls.
Metals benchmarks are calculated to mimic acute water quality standards and with the guidance of
NC's Division of Water Resources (DWR). NC DWR follows established federal procedures for
calculating acute standards when developing the benchmarks. Just like the acute standards, metals
benchmarks normally reflect one half of the calculated Final Acute Value (the "1/z FAV"). In most
cases, translation into total recoverable values is based on an assumed hardness of 25 mg/1 and a
total suspended solids (TSS) concentration of 10 mg/L. Acute standards protect aquatic life from
negative impacts of short-term exposure to higher levels of chemicals where the discharge enters a
waterbody. The Stormwater Permitting Program applies this approach because of the ephemeral
nature of rainfall events and the associated discharges.
The Division may evaluate results to determine if a smaller suite of parameters for some outfalls is
adequate to characterize potential pollution or BMP effectiveness. For example, one or more metals
or other parameters may serve as an adequate tracer for the presence of ash pollution during
disturbance or ash removal in specific drainage areas at this site. For parameters that do not have a
stormwater benchmark, the Division may develop a benchmark value if appropriate toxicity data
become available or if rising trends in concentrations suggest a persistent source.
A summary of the benchmarks in the draft permit, and their basis, is below:
Parameter
Benchmark
Basis
Antimony (Sb), m L Total
0.09
Acute Aquatic Criterion, 1/z FAV
Arsenic (As), m L Total
0.34
Acute Aquatic Criterion, 1/z FAV
Beryllium (13e), m L Total
0.065
Acute Aquatic Criterion, 1/z FAV
Cadmium (Cd), m L Total
0.003
Acute Aquatic Criterion, 1/z FAV
1/z FAV, based on (Cr III + Cr VI) acute thresholds
Chromium (Cr), mg/L (Total)
0.9
and assumption that industrial activities here are
not a source of hexavalent chromium.
Copper (Cu), m L Total
0.010
Acute Aquatic Criterion, 1/z FAV
Lead (Pb), m L Total
0.075
Acute Aquatic Criterion, 1/z FAV
Monitoring only, CCW/Coal Constituent. Hg
influenced by regional transport and wet
Mercury (Hg), ng/L (Total)
N/A
deposition. Values above 12 ng/L (NC WQ
standard) should be noted on the DMR but do not
trigger Tier Responses.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 5
Parameter
Benchmark
Basis
Nickel (Ni), m L Total
0.335
Acute Aquatic Criterion, 1/z FAV
Polychlorinated biphenyl
Detected
NC Water Quality Standards vs. present Arochlors
compounds (PCBs), µg/L
quantitation levels (higher than standard)
1/z FAV, NC -specific, based on 1986 Study on Se
Selenium (Se), mg/L (Total)
0.056
impacts in North Carolina
Acute Aquatic Criterion, 1/z FAV. (The Division
Silver (Ag), mg/L (Total)
0.0003
notes this value is below the practical quantitation
level (PQL) of 1 µg/l, of EPA Method 200.8)
Monitoring only, CCW/Coal Constituent. Narrative
Boron (B), mg/L
N/A
National Recommended Water Quality Criterion.
Monitoring Only, CCW/Coal constituent. National
Thallium (Tl), mg/L (Total)
N/A
Recommended Human Health Criterion.
Zinc (Zn), m L Total
0.126
Acute Aquatic Criterion, 1/z FAV
Total Suspended Solids (TSS),
National Urban Runoff Program (NURP) Study,
mg/L
100
1983
Non -Polar Oil & Grease, EPA
Review of other state's daily maximum benchmark
Method 1664 (SGT -HEM),
15
concentration for this more targeted 0&G; NC WQ
mg/L
Standard that does not allow oil sheen in waters.
pH
6-9
NC Water Quality Standard (Range)
STORMWATER POLLUTION PREVENTION PLAN
The proposed permit conditions reflect the Environmental Protection Agency's (EPA) and North
Carolina's pollution prevention approach to stormwater permitting. The Division's maintains that
implementation of Best Management Practices (BMPs) and traditional stormwater management
practices that control the source of pollutants meets the definition of Best Available Technology
(BAT) and Best Conventional Pollutant Control Technology (BCT). The permit conditions are not
numeric effluent limitations but are designed to be flexible requirements for implementing site-
specific plans to minimize and control pollutants in stormwater discharges associated with the
industrial activity. Title 40 Code of Federal Regulations (CFR) §122.44(k)(2) authorizes the use of
BMPs in lieu of numeric effluent limitations in NPDES permits when the agency finds
numeric effluent limitations to be infeasible. The agency may also impose BMP requirements
which are "reasonably necessary" to carry out the purposes of the Act under the authority of 40
CFR 122.44(k) (3). The conditions proposed in this draft permit are included under the authority of
both of these regulatory provisions. In essence, the pollution prevention and BMP requirements
operate as limitations on effluent discharges that reflect the application of BAT/BCT.
Determining specific BMPs that are appropriate for the site and activities are the permittee's
responsibility, and the permit strives not to limit what BMPs can be used. The permittee should
also refer to the BMPs described in both EPA's Multi -Sector Permit (MSGP) and Industrial
Stormwater Fact Sheet for Steam Electric Power Generating Facilities (Sector 0) for guidance on
pollution prevention measures.
It is important to note that the largest portion of stormwater runoff at this facility is ultimately
routed into the waste treatment system (ash pond), and those discharges are regulated by the
NPDES wastewater permit.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 6
MERCURY MONITORING REQUIREMENTS
The proposed permit requires mercury to be measured in stormwater samples by EPA Method
1631E, which can detect levels as low as 0.5 ng/L. This requirement is consistent with recent
federal rule-making that requires NPDES permittees to monitor discharges with sufficiently
sensitive test procedures approved under 40 CFR §136. Modifications to 40 CFR §122.44(i) require
a method that has a minimum level (ML) at or below the effluent limit (not applicable here), or the
lowest minimum level (ML) of EPA approved analytical methods for the measured parameter.
Based on results, Method 1631E will be required to quantify levels in these discharges. NC DEMLR
understands that this method is more costly and requires a more intensive sampling protocol than
most other parameters, and that fish tissue sampling will be provided during the permit cycle.
Therefore, no benchmark applies that would trigger tiered response actions. Proposed permit
provisions also allow the permittee to use field blank and/or method blank concentrations to adjust
reported mercury levels as long as documentation is submitted with the Discharge Monitoring
Report (DMR).
FLEXIBILITY IN TIER RESPONSES
Tier Two actions (upon two consecutive benchmark exceedances at an outfall) proposed in this
draft permit differ slightly from the Program's standard template and includes step S. That step
provides an opportunity for the permittee to propose an alternative monitoring plan for
approval by the Region:
4. Alternatively, in lieu of steps 2 and 3, the permittee may, after two consecutive exceedances,
exercise the option of contacting the DEMLR Regional Engineer as provided below in Tier
Three. The Regional Engineer may direct the response actions on the part of the permittee
as provided in Tier Three, including reduced or additional sampling parameters or
frequency.
S. If pursuing the alternative above after two consecutive exceedances, the permittee may
propose an alternative monitoring plan for approval by the Regional Engineer.
The permit therefore allows the permittee to petition the Regional Office for monitoring changes
sooner than Tier Three (upon any four benchmark exceedances) and gives guidance on one option
to take. For example, the permitttee may request that mercury only be monitored semi-annually
under the tiers, or that only parameters over the benchmark be monitored more frequently. In this
way, changes to the monitoring scheme for any outfall could be handled outside of a permit
modification.
OTHER PROPOSED REQUIREMENTS
It is standard for Stormwater Pollution Prevention Plan (SPPP) requirements to include an
annual certification that stormwater outfalls have been evaluated for the presence of non-
stormwater discharges, and if any are identified, how those discharges are permitted or
otherwise authorized. The draft permit requires this facility to submit the first
certification to DEMLR no later than 90 days after the effective date of the permit
(Part 11, Section A.).
Requirement to submit a request for permit modification if the facility identifies or creates
any new outfalls, removes outfalls, or alters any drainage area that changes potential
pollutants.
Proposed federal regulations will require electronic submittal of all discharge monitoring
reports (DMRs). If a state does not establish a system to receive such submittals, then
permittees must submit DMRs electronically to the Environmental Protection Agency (EPA).
The Division anticipates that these regulations will be adopted and is beginning
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 7
implementation. Permit provisions addressing this impending requirement is included in
Part III, Section B. (General Conditions), 3.e.
Quarterly Qualitative/Visual Monitoring to assure regular observation of outfalls
throughout year.
INSTREAM MONITORING
The facility historically had monitoring stations located upstream and downstream. Instream
sampling has been for balanced and indigenous populations assessment (BIPA) near the Marshall
Steam Station and for wastewater permit in -stream monitoring requirements. Upstream sampling
for the wastewater permit is approximately one mile upstream of the ash pond discharge (station
15.9), and the downstream sampling (station 14) is approximately one mile downstream of that
discharge. Monitored parameters were As, Cd, Cr, Cu, Hg, Pb, Se, Zn, and Total Dissolved Solids. All
constituents were below water quality standards for the sampling events at each location.
In -stream monitoring is not proposed in this draft NPDES stormwater permit.
FISH TISSUE MONITORING
Wastewater permit NC0004987 required fish tissue monitoring for As, Se, and Hg near the ash
pond discharge once every five years. Sunfish and bass tissue were analyzed. The results were
below action levels for Se and Hg and below screening value for As. The proposed stormwater
permit requires the permittee to submit a copy of future monitoring results to the DEMLR
Stormwater Permitting Program (Central Office) within 30 days of receiving results and indicate
the location of sampling in relation to stormwater discharge outfalls. DEMLR is requiring the fish
tissue analysis results be submitted separately because the proposed NC0004987 permit does not
require submittal to DWR until application for permit renewal.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: March 2015 (est.)
Permit Scheduled to Issue: June 2015 (est.)
STATE CONTACT:
If you have any questions about any of the above information or the attached permit, please contact
Ken Pickle at (919) 807-6376 or bethany.georgoulias@ncdenr.gov.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 8
STORMWATER SAMPLING RESULTS FROM MARSHALL (SUBMITTED OCTOBER 2014)-
Parameter
014
Parameter
Units
Sample Location
SWO07 SW012
COD
mg/L
26 < 20
Cl - Chloride (00940)
mg/L
1.3 6.8
Fluoride
mg/L
0.68 0.45
SO4 - Sulfate (00945)
mg/L
64 220
Oil & Grease
mg/L
¢ 5 < 5
Hg - Mercury (71900)
µg/L
< 1 c 0.05
Al - Aluminum (01105)
mg/L
35 0.941
Ba - Barium (01007)
mg/L
0.469 0.042
B - Boron (01022)
mg/L
0.181 4.064
Ca -Calcium
mg/L
52.6 103
Hardness
mg/L (CaCO3)
187 262
Fe - Iron (01045)
mg/L
54.9 0.896
Mg -Magnesium
mg/L
13.5 1.32
Mn - Manganese (01055)
mg/L
4.748 0.016
Zn - Zinc (01092)
mg/L
0.91 0.075
Sb - Antimony (01097)
4g/L
1.4 1.11
As - Arsenic (01002)
4g/L
32.2 1.06
Cd - Cadmium (01027)
µg/L
1.42 < 1
Cr _ Chromium (01034)
l-ig/L
60.3 1.53
Cu - Copper (01042)
µg/L
96.3 4.79
Pb - Lead (01051)
µg/L
48.5 < 1
Molybdenum (Mo)
pg/L
10.9 2.74
Ni - Nickel (01067)
µg/L
52.8 1.4
Se - Selenium (01147)
4g/L
19.6 6.76
TI - Thallium (01059)
4g/L
1.08 0.426
pH
SI Units
7.75 7.71
Specific conductance
µ5/cm
224 428
TDS - Total Diss. Solids (7+0300)
mg/L
290 370
Temperature
C
-- --
TSS-Total Suspended Solids
mg/L
1100 27
Nate: temperatures were not taken during the sampling event.
Fact Sheet
NPDES Stormwater Permit NCS000548
Page 9
STORMWATER SAMPLING RESULTS FROM MARSHALL (DECEMBER 2014
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Fact Sheet
NPDES Stormwater Permit NCS000548
Page 10
STORMWATER SAMPLING RESULTS FROM MARSHALL (MARCH 2011 ORIGINAL APPLICATION
Parameters
Benchmark
Outfall SWO07
Outfall SWO07
Oil and Grease
30 mg/1
ND mg/1
Aluminum
0.75 mg/l
3.310 mg/1
4.010 mg/I
Arsenic
0.36 mg/l
ND mg/1
0.0074 mg/1
Barium
0.0636 mg/1
0.0716 mg/1
Boron
0.030 mg/I
ND mg/I
Cadmium
0.001 mg/1
ND mg/1
ND mg/1
Chromium
1.0 mg/1
ND mg/1
0.0054 mg/1
Cobalt
0.03 mg/l
ND mg/1
ND mg/I
Copper
0.007 mg/l
0.0161 mg/I
0.018 mg/I
Iron
1.0 mg/1
6.120 mg/1
7.480 mg/I
Magnesium
32 mg/1
2.460 mg/1
2.590 mg/1
Manganese
0.135 mg/1
0.152 mg/1
Nickel
0.26 mg/1
0.006 mg/1
0.0064 mg/1
Selenium
0.056 mg/1
ND mg/1
ND mg/1
Silver
0.001 mg/1
ND mg/1
ND mg/1
Titanium
0.270 mg/1
0.326 mg/1
Zinc
0.067 mg/1
0.108 mg/1
0.117 mg/I
Mercury
0.000012 mg/l
ND mg/1
ND mg/1
Apparent Color
100 units
TSS
100 mg/1
136 mg/ I
BOD
30 mg/1
8.0 mg/l
8.0 mg/1
Nitrogen, Ammonia
7.2 mg/l
ND mg/1
Nitrogen, Kjeldahl, Total
20 mg/1
0.91 mg/1
Nitrogen NO2 plus NO3
10 mg/1
0.40 mg/1
Phosphorus
2 mg/l
0.20 mg/1
Phenol
4.5 mg/I (trout)
ND mg/1
Chloride
860 mg/l
ND mg/1
COD
120 mg/1
178 mg/I
Sulfate
500 mg/1
25.7 mg/1
Fact Sheet
NPDES Stormwater Permit NCS000548
Page I l