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Ms Carol Oz Project 880-040 IA December 5, 2000 Page 5 of 6 Well installation soil analytical data is summarized in Table 3 and on Figure 6 Laboratory reports with COC documentation is included in Attachment D Groundwater Analytical Results Groundwater samples were collected from GP-1 through GP-5 at approximately 14 feet bgs TPH-g and benzene were not reported in GP-1, GP-3, GP-4, and GP-5 TPH-g and benzene were reported in GP-2 at concentrations of 8,240 parts per billion (ppb) and 1,940 ppb, respectively MtBE was reported by EPA Method 8260 in all Geoprobe1' groundwater samples at concentrations ranging from 281 ppb in GP-5 to 47,000 ppb in GP-2 TAME was reported in GP-1 through GP-4 at concentrations of 18 4 ppb, 188 ppb, 268 ppb and 83 ppb, respectively TBA was reported in GP-2 through GP-4 at concentrations of 4,300 ppb, 7,030 ppb and 4,260 ppb, respectively ETBE was reported in GP-2 at 5 18 ppb Geoprobe groundwater analytical data is summarized in Table 2 and on Figure 7 Laboratory reports with COC documentation are included in Attachment D TPH-g was reported in MW-1 through MW-3 at concentrations of 25,700 ppb, 52 9 ppb and 5,900 ppb, respectively Benzene was reported in MW-1 and MW-3 at concentrations of S1,820 ppb and 41 3 ppb, respectively MtBE was reported in MW-1 through MW-3 at concentrations of 28,300 ppb, 5,830 ppb and 346 ppb, respectively TAME was reported in MW-1 through MW-3 at concentrations of 108 ppb, 45 ppb, and 2 08 ppb, respectively TBA was reported in MW-1 and MW-2 at concentrations of 3,710 ppb and 1,150 ppb, respectively Groundwater monitoring well analytical data is summarized in Table 4 and on Figure 7 Laboratory reports with COC documentation are included in Attachment D CONCLUSIONS With the exception of the area north and east of the product dispenser islands (near GP-1, GP-2, and MW-1)the lateral and vertical extent of soil impacted by TPH-g and BTEX has been generally defined by this investigation The lateral extent of petroleum hydrocarbons in the area of GP-1, GP-2, and MW-1 is still undefined above 25 feet bgs Groundwater samples collected during both phases of work indicate significant concentrations of petroleum hydrocarbons, including MTBE, in the groundwater The lateral extent of dissolved petroleum hydrocarbons has not been determined by this investigation The absence of water supply wells within 2000 feet of the subject site suggests that the groundwater impacts do not represent a threat to human health by groundwater ingestion and there is a low potential for SaCDP iLVICRFPIICOMMOMCw»islfujgUaeaShme"miecl,lmiscl88"40!A w dac IT CORPORA TION