Evaluation of Pollutants in Wastewater Generated by Mobile Car Washing Operations
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1 Evaluation of Pollutants in Wastewater Generated by Mobile Car Washing Operations City of Durham Public Works, Stormwater t Services Maverick Raber, Matt Smith, John Cox, Michelle Woolfolk Public Works Stormwater Services 101 CITY HALL PLAZA DURHAM, NC P F maverick.raber@durhamnc.gov
2 Study Summary What do mobile car wash controls prevent from entering the municipal separate storm sewer (MS4) in Durham? Annual metals loads of 3.7 lbs zinc and 2 lbs copper Annual nutrient loads of 31.9 lbs total nitrogen (TN) and 5.3 lbs total phosphorus (TP) Annual total suspended solids (TSS) load of 625 lbs, total organic carbon (TOC) load of 412 lbs, biochemical oxygen demand load of 309 lbs, chloride load of 67 lbs
3 A Little Background. Why are we do this? REGULATORY DRIVERS Existing TMDLs and Nutrient Management Strategies for Falls and Jordan Lakes Nitrogen Phosphorus Turbidity Fecal Coliform 303(d) Listings Zinc Copper Dissolved Oxygen Biological Impairment Fecal Coliform NPDES permit requirements to address stormwater impacts to local streams ***Identify and quantify benefits of current programs. Credit for what we are doing***
4 Durham s Stormwater Pollution Control Ordinance Required in the City s NPDES permit for the municipal separate storm sewer system (MS4) Bans non-stormwater discharges to the City s stormwater system (some exceptions) Mobile car washing operations included Vendors must collect, contain, and properly dispose of wastewater to sanitary sewer
5 Mobile Car Wash Wastewater Collection and Containment Containment System Collection System Typical containment and collection system cost ~ $250 Sump pump or wet vac, hose, extension cord, tarp, berm materials Cost may be higher if wastewater tank is needed
6 Goals and Objectives Identify pollutants t in mobile car wash wastewater Quantify pollutant concentrations in car wash wastewater Calculate pollutant loads from mobile car washing operations in the City Determine reduction of pollutant loads to the City s MS4 from ordinance enforcement
7 Sample Strategy Initially wanted five participating companies, ended up using two Fine forgiveness $$$ Paid Minimum 25 vehicles (ended up with 27) Composite samples, based on volume 3-5 vehicles per composite 3 composites per day/company Documentation Vehicle year/make/model, Date of previous wash Garaged/parked in open Cleaning supplies used by vendor
8 Field Measurements Water Temperature Specific Conductance ph Dissolved Oxygen Turbidity
9 Nutrients ts Metals Analytical Measurements Nitrate + Nitrite Total Kjeldahl Nitrogen Total Phosphorus Cadmium Chromium Copper Manganese Nickel Lead Antimony Zinc Polycyclic Aromatic Hydrocarbons (PAHs) 5-day Biochemical Oxygen Demand (BOD) Total Suspended Solids (TSS) Total Organic Carbon (TOC) Chloride
10 Sample Collection
11 Sample Collection (continued)
12 Sample Collection (continued)
13 Wastewater Disposal
14 MEAT AND POTATOES? BREAD AND BUTTER??..sample results
15 Quality Control Field Blanks Field Blank Day 1 Field Blank Day 2 Analyte Units MDL MRL Result Flag Result Flag Nitrate/Nitrite as N mg/l U J Total Kjeldahl Nitrogen mg/l JB 0.16 U Total Kjeldahl Nitrogen mg/l U U Antimony ug/l U 1 U Cadmium ug/l U 0.36 U Chromium ug/l U 1 U Copper ug/l J 2.66 JB Lead ug/l U 1.9 U Manganese ug/l U 1.1 U Nickel ug/l U 1.8 U Zinc ug/l J 3.8 U Benzo(a)anthracene ug/l U 1.3 U Benzo(a)pyrene ug/l U 1.3 U Benzo(g,h,i)perylene ug/l U 2.4 U Chrysene ug/l U 2 U Dibenzo(a,h)anthracene ug/l U 2.3 U Fluoranthene ug/l U 2.1 U Indeno(1,2,3-cd)pyrene ug/l U 2.2 U Napthalene ug/l U U Phenanthrene ug/l U 1.4 U Biochemical Oxygen Demand mg/l U 2 U Chloride mg/l U 1.9 U Total Suspended Solids mg/l U 1 U Total Organic Carbon mg/l J J Nutrients Metals PAHs
16 Quality Control Duplicates Metals ents Nutri Site ID Dup ID Analyte Units Result Flag Result Flag % Difference MCW 02 MCW 04 Antimony Total ug/l MCW 02 MCW 04 Cadmium Total ug/l 0.36 U J 7.8 MCW 02 MCW 04 Chromium Total ug/l MCW 02 MCW 04 Copper Total ug/l MCW 02 MCW 04 Lead Total ug/l MCW 02 MCW 04 Manganese Total ug/l MCW 02 MCW 04 Nickel Total ug/l MCW 02 MCW 04 Zinc Total ug/l MCW 07 MCW 08 Antimony Total ug/l MCW 07 MCW 08 Cadmium Total ug/l MCW 07 MCW 08 Chromium Total ug/l MCW 07 MCW 08 Copper Total ug/l 1280 B 1280 B 0.0 MCW 07 MCW 08 Lead Total ug/l MCW 07 MCW 08 Manganese Total ug/l MCW 07 MCW 08 Nickel Total ug/l MCW 07 MCW 08 Zinc Total ug/l MCW 02 MCW 04 Nitrate/Nitrite as N mg/l MCW 02 MCW 04 Phosphorus Total mg/l MCW 02 MCW 04 Total Kjeldahl Nitrogen mg/l 9.3 B 9.4 B 1.1 MCW 07 MCW 08 Nitrate/Nitrite as N mg/l MCW 07 MCW 08 Phosphorus Total mg/l 3.4 D 3.2 D 5.9 MCW 07 MCW 08 Total Kjeldahl Nitrogen mg/l 18 D 18 D 0.0
17 Quality Control Duplicates PAHs Site ID Dup ID Analyte Units Result Flag Result Flag % Difference MCW 02 MCW 04 Benzo(a)anthracene ug/l 13 UD 13 UD 0.0 MCW 02 MCW 04 Benzo(a)pyrene ug/l 13 UD 13 UD 0.0 MCW 02 MCW 04 Benzo(g,h,i)perylene ug/l 24 UD 24 UD 0.0 MCW 02 MCW 04 Chrysene ug/l 20 UD 20 UD 0.0 MCW 02 MCW 04 Dibenzo(a,h)anthracene ug/l 23 UD 23 UD 0.0 MCW 02 MCW 04 Fluoranthene ug/l 21 UD 21 UD 0.0 MCW 02 MCW 04 Indeno(1,2,3 cd)pyrene ug/l 22 UD 22 UD 0.0 MCW 02 MCW 04 Napthalene ug/l 13 UD 13 UD 0.0 MCW 02 MCW 04 Phenanthrene ug/l 14 UD 14 UD 0.0 MCW 07 MCW 08 Benzo(a)anthracene ug/l 1.3 U 1.3 U 0.0 MCW 07 MCW 08 Benzo(a)pyrene () ug/l U U MCW 07 MCW 08 Benzo(g,h,i)perylene ug/l 2.4 U 2.4 U 0.0 MCW 07 MCW 08 Chrysene ug/l 2 U 2 U 0.0 MCW 07 MCW 08 Dibenzo(a,h)anthracene ug/l 2.3 U 2.3 U 0.0 MCW 07 MCW 08 Fluoranthene ug/l 2.1 U 2.1 U 0.0 MCW 07 MCW 08 Indeno(1,2,3 cd)pyrene ug/l U U MCW 07 MCW 08 Napthalene ug/l 1.3 U 1.3 U 0.0 MCW 07 MCW 08 Phenanthrene ug/l 1.4 U 1.4 U 0.0 MCW 02 MCW 04 Biochemical Oxygen Demand mg/l MCW 07 MCW 08 Biochemical Oxygen Demand mg/l MCW 02 MCW 04 Chloride mg/l MCW 07 MCW 08 Chloride mg/l MCW 02 MCW 04 Total Suspended Solids mg/l MCW 07 MCW 08 Total Suspended Solids mg/l MCW 02 MCW 04 Total Organic Carbon mg/l 240 D 140 D 41.7 MCW 07 MCW 08 Total Organic Carbon mg/l 210 D 200 D 4.8
18 Composite Concentrations: Metals (µg/l) centration ( Conc
19 Composite Concentrations: Nutrients mg/l) entration (m Conce
20 Composite Concentrations: o TSS, BOD, TOC, Chloride mg/l) entration (m Conce
21 Composite Concentrations: o PAHs All non-detect!
22 Untreated Domestic Wastewater Comparisons
23 Calculating Annual # of Washes Phone surveyed companies on compliance list 50 companies, 21 respondents Classified each as auto rental, contract, executive, full-time, or part-time 16 companies considered active that did not respond to phone survey Identifiable business license Active company voic Company website/facebook account Observed in the field during 2011 Assumed part-time if outside Durham (5) Assumed full-time if in Durham (11) Median value from survey results (21 respondents) applied to the 16 non-respondents based on classification
24 Calculating Annual # of Washes Rental Car Contract Executive Full-time/Part-time
25 Annual Mobile Car Washes in Durham Annual Washes = 43,356
26 Mobile Car Washing Businesses in Durham Active Businesses = 37
27 Annual Loads: Metals (lbs) Annual Load (
28 Annual Loads: Nutrients (lbs) Annual Load (
29 Annual Loads: TSS, BOD, TOC, Chloride (lbs) Annual Load (
30 In Summary.. Estimated >40,000 car washes by mobile setups Approximately half of those by just a few rental car companies Several pollutant concentrations in mobile car wash wastewater are similar to or higher than untreated domestic wastewater Annual metals loads highest for zinc (3.7 lbs) and copper (2 lbs) Streams in Durham on 303(d) list for zinc and copper Annual nutrient loads of 31.9 lbs TN and 5.3 lbs TP Falls and Jordan Lakes Nutrient Management Strategies High annual loads of TSS (625 lbs), TOC (412 lbs), BOD (309 lbs), Chloride (67 lbs) Streams in Durham on 303(d) list for turbidity and DO PAHs were not detected in any sample
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