Laserfiche WebLink
The"C"event mean constituent concentration values were obtained from numerous studies conducted throughout <br /> California (Larry Walker Associates 1997, 1998, 1999, 2000a-b, and 2001a-d as cited in RBF Consulting [2002]), <br /> with priority being given to data available from sites located in the Central Valley region.Mean constituent <br /> concentrations for four land use designations (i.e.,undeveloped, residential,commercial, and industrial) were <br /> used as shown in Table 4.8-3. For the purposes of this analysis,undeveloped land uses included open space, <br /> .. buffer and conservation lands, and agricultural lands;parks were included with the residential land use category. <br /> Table 4.8-4 shows the estimated acreage of land uses under existing and developed conditions within the College <br /> Park area only(i.e., excluding the watershed located upstream of College Park),based on information contained <br /> in the College Park drainage plan(MacKay& Somps 2004)and the Mountain House Storm Water Master Plan <br /> Update(MHCSD 2003). <br /> Table 4.8-3 <br /> Mean Constituent Concentrations for Land Use Categories <br /> Constituent Residential Commercial Industrial Undeveloped <br /> Conventional(mg/L) <br /> Oil and Grease 4.19 8.35 4.63 5.97 <br /> TSS 135 174 167 578 <br /> BOD 23.3 23.1 23.5 31.2 <br /> Nutrients(mgtL) <br /> TKN 3.56 3.65 2.70 5.51 <br /> Nitrate+Nitrite 1.60 1.54 2.48 6.87 <br /> Ammonia 0.84 1.04 0.80 1.95 <br /> Dissolved phosphorus 0.30 0.27 0.31 0.76 <br /> Total phosphorus 0.73 0.62 0.53 1.72 <br /> Trace Metals(µg/L) <br /> Total chromium 4.61 13.4 9.82 7.10 <br /> Dissolved chromium 1.97 2.90 3.24 6.07 <br /> Total copper 19.3 45.0 26.8 37.0 <br /> Dissolved copper 8.01 9.67 11.0 24.4 <br /> Total lead 16.4 16.7 19.9 19.7 <br /> Dissolved lead 4.44 4.90 5.33 11.4 <br /> Total mercury 0.10 0.02 0.14 0.11 <br /> Total selenium 3.18 0.55 1.10 1.00 <br /> Total zinc 108 200 329 217 <br /> Dissolved zinc 44.5 63.4 67.5 32.0 <br /> Pesticides(µg/L) <br /> Chlorpyrifos 0.06 0.21 0.03 - <br /> Diazmon 0.71 0.19 - 0.07 <br /> Source:Larry Walker Associates(1997,1998, 1999,2000a-b,and 200la-d)as cited in RBF Consulting(2002). <br /> College Park at Mountain House Specific Plan III Draft EIR EDAW <br /> San Joaquin County 4.8-11 Water Quality <br />