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perchlorate, sulfate,and pH). In soil,TPH compounds, organochlorine <br /> pesticides, organophosphorous compounds,and chlorinated herbicides <br /> were either not detected or detected at low levels. Chloride,nitrate, <br /> sulfate,and ammonia were observed in soil samples SB-4 through SB-7. <br /> However,regulatory limits for these elements have not been established. <br /> In groundwater,numerous metals were detected at levels greater then <br /> their respective National Primary Drinking Water Standards-Primary <br /> Maximum Concentration Level (PMCL) and Secondary Maximum <br /> Concentration Level (SMCL) and United States Environmental Protection <br /> Agency, Region IX, tap water Preliminary Remediation Goals (PBGs). <br /> Chloride,nitrate, and sulfate were also detected at concentrations greater <br /> than their PMCL or SMCL in at least half the wells. Ammonia and the <br /> chlorinated herbicide MCPP were detected in groundwater samples, <br /> although these compounds do not have an established PMCL or SMCL. <br /> The Phase 1I ESA recommended additional sampling to determine the <br /> horizontal and vertical extent for compounds detected above their <br /> respective regulatory limit. <br /> 3.4 FACILITY INVESTIGATION <br /> In July 2006, ERM conducted a Facility Investigation which included the <br /> installation of 12 soil borings to a depth of approximately 12 feet bgs <br /> (Figure 3). Soil samples were collected at two separate depths (one <br /> sample at 2 feet bgs and the second sample at the depth just above first- <br /> encountered groundwater-logged at approximately 6 to 7 feet bgs). <br /> Groundwater samples were collected from 12 temporary wells that were <br /> screened from 7 to 12 feet bgs. Soil samples were analyzed for total <br /> priority pollutant metals,chlorinated herbicides,organochlorine <br /> pesticides, organophosphorous pesticides,ammonia,chloride, nitrate, <br /> sulfate,alkalinity, and pH. Groundwater samples were analyzed for one <br /> or more of the following constituents: TPH in the gasoline and diesel <br /> range,total and dissolved metals,chlorinated herbicides,organochlorine <br /> pesticides, organophosphorous pesticides,ammonia,chloride,nitrate, <br /> sulfate,alkalinity, and pH. <br /> Soil <br /> Chlorinated herbicides and organophosphorous pesticides were not <br /> detected in soil. The organochlorine pesticides delta-BHC,4,4'-DDE,4,4'- <br /> DDT, and dieldrin were detected in one or more shallow (2 feet bgs) soil <br /> samples. Dieldrin was the only compound detected above its residential <br /> PRG in one location at 2 feet bgs. <br /> ERM 5 L6 ,INC/0067373.01-N..baID <br />