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COMMERCIAL COMPOSTING WATER QUALITY PERMIT DEVELOPMENT <br /> TABLE 2-6 <br /> Reported Range of Concentrations of Various Constituents in Runoff <br /> Mixed Facilities* <br /> (Ranges mg/L unless noted) 1200-Z 1200-COLS <br /> Benchmarks Benchmarks <br /> Constituent (mg/L) (mg/L) <br /> Ammonia 32-1,600 NA NA <br /> Biochemical Oxygen Demand 20-3,200 NA 33 <br /> (BODS) <br /> Chloride 52-2,100 NA NA <br /> Color 1,000-70,000 color units NA NA <br /> Conductivity 887-16,500 NA NA <br /> Copper(total) 0.033-0.82 0.1 0.036 <br /> E.coli 200-2.4x10'MPN/100mL as 406 MPN/100ml- 406 MPN/100mL <br /> Fecal coliform,not E.coli <br /> Nitrate+nitrite N 0-8 NA NA <br /> Ortho Phosphate 0-90 NA NA <br /> pH 6.7-9.5 NA NA <br /> Phosphorus(total) 4-170 NA 0.16 <br /> Potassium 170-4,600 NA NA <br /> Total Kjeldahl Nitrogen(TKN) 14-3,000 NA NA <br /> Total Suspended Solids 1,100-20,000 NA NA <br /> (TSS) <br /> Zinc(total) 0.1-1.5 0.6 0.24 <br /> Notes: <br /> The type of BMPs that may have been used at these facilities is unknown. It was not reported in this study. <br /> Concentrations were reported as a range and therefore cannot be isolated to specific facility types.(E&A <br /> Environmental Consultants, Inc.,July 1998) <br /> *Mixed facilities=large yard debris and mixed food waste,food waste composter,medium yard debris facility, <br /> manure and brush facility, and manure facility. <br /> NA=not available <br /> 2.3.3 Stormwater <br /> In theory,stormwater should have the lowest concentrations of potential pollutants, as <br /> compared to compost leachate and runoff. However,there is the potential that the <br /> stormwater of the site may contact portions of the site or equipment that may be <br /> contaminated with pollutants from the site (process stormwater).Table 2-7 shows multiple <br /> years of stormwater data collected from an Oregon composter operating outdoors in an area <br /> of 37.07 inches of annual rainfall (using green compost feedstocks) (Oregon Climate Service, <br /> 2004).These samples were collected at catch basins which receive runoff from asphalt <br /> surfaces on their property.These results are compared with both the 1200-Z and 1200-COLS <br /> 12 PDXI041320015.DOC <br />