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x <br /> i <br /> 4-5 <br /> t <br /> limit of 5 mg/kg. The sample collected from 50 fent in Mme'-"o contained 7 mg/kg petroleum <br /> hydrocarbons. The samples collected from 10 feet and 50 feet in MW-9 contained 6 mg/kg,and <br /> 100 mg/kg petroleum hydrocarbons, respectively. <br /> • Other Soil Analytical Results, One composite soil sa:-iple was collected from the <br /> approximately four cubic yards of soil stockp:led at the site. This sample is a composite of soil <br /> • from four distinct locations in the stockpile which was combinzd in the field and stored in a glass <br /> sampling jar with a teflon lined screw-on top. the composite sample (spoil composite) was <br /> w� analyzed for 13ETX and TPH using EPA Method 5015 with extraction by EPA Method 5030. <br /> Analytical results of this sample indicate that none of the tested constituents were present n <br /> :drIntMablr amounts based on the same detection limits as the borehole samples. <br /> Groundwater Results <br /> This section presents the field and analytical results of groundwater samples collected from <br /> the nine monitoring wells at the site (Figure 3-4). On May 2, 1990,MW-I through MI's-5 were <br /> redeveloped and sampled as described in Brown and Caldwefl's March 10, 1990, Work Plan <br /> W. (Appendix A). .Wells MW-6 through MW-9 (newly installed) were eeveloped and sampled <br /> during the week of July 2, 1990. The groundwater samples were analyzed for BE <br /> TX and TPH <br /> using EPA Method 8015 with extraction by Method 5030. <br /> During purging in each well,field me:!surements of pH,electrical conductivity,and volume <br /> of water were recorded. Table 4-3 presents these recorded measurements. These parameters air. <br /> monitored to ensure that representative samples are collected from each well. <br /> The groundwater samples collected from MW-6 through MW-9 were inadvertently held <br /> approximately 4 days beyond the recommended holding time of 14 days prior to analysis by the <br /> laboratory. The samples were submitted to the laboratory within four days of collection, <br /> therefore the holding time expired when the samples were in a controlled laboratory environment. <br /> The recommended holding time for this type of analysis is 14 days if preserved with HCl <br />