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lead (Pb) utilizing EPA method 8240/8260 and DHS&EML 338 methods, respectively The samples were composited in a two to one manner, for a total of six composites Laboratory results are ' summarized in Table 3 4.1.2 Stockpiled Soil 1 On November 22, 1989, six samples composite soil les were collected from the the excavated material P p stockpiled on-site The samples were placed on ice, secured, and transported under chain-of- custody protocol to Argon Laboratories The samples were analyzed for TPHd, TPHg, and BTEX Laboratory results for composite samples collected from the excavated material did not ' indicate the presence of hydrocarbon contamination above method detection levels Hydrocarbons present in the material excavated on October 25, 1989 apparently volatilized prior to composite sampling on November 22, 1989 Based on analytical results, the former tank pit was backfilled with ' the excavated and remedrated material 1;_2 Assessment of Soil Contamination ' In August 1990, a WaterWork geologist supervised the drilling of three vertical soil borings to assess subsurface conditions at the project site The borings were completed as groundwater morutoring wells An experienced field geologist was present to continuously log all drill cuttings and soil samples Soil samples were collected at 5 foot intervals and were field screened with a photoronrzatron detector (PID) The samples were placed on ice, secured, and transported under chain-of-custody protocol to Argon Laboratories Selected samples were analyzed for TPHg and BTEX Samples contained no detectable concentrations of petroleum hydrocarbons Sample locations are shown on Figure 2 and analytical results are summarized in Table 3 In March 1992, RESNA Industries, Inc (RESNA) supervised the drilling of one soil boring, MW4, downgradrent from the excavated area The boring was completed as a groundwater monitoring well Soil samples were collected at 5 foot intervals and were field screened with a PID The sample was placed on ice, secured, and transported under chain-of-custody protocol to Argon Laboratories One sample was analyzed for TPHg, TPHd, and BTEX The sample contained no detectable concentrations of petroleum hydrocarbons Sample locations are shown on Figure 2 and analytical results are summarized in Table 3 4_3 Assessment of Groundwater Contamination In August 1990, WaterWork installed groundwater monitoring wells MW-1, MW-2, and MW-3 to an average depth of 35 feet using a hollow stem auger drill rig The wells were constructed with 2-inch diameter PVC casing and completed as shown on the well logs contained in Appendix C The wells ' were monitored, developed, and samples collected The samples were placed on ice, secured, transported under chain-of-custody protocol to Argon Laboratories, and analyzed for TPHg and BTEX TPHg and BTEX were detected in MW-I and toluene and xylenes were detected in MW-3 w 194339\dowredw 3 1 � SMTH 1