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Formei Manna Pro Site Page 8 Quarteily Groundwater Monitoting Repoit ' &Monitoiing Well Construction Piolect No 207 2 June 2, 2000 ' 3540/8015m The soil analytical data are summarized in the table below, The three deepest samples (MW-55, MW-69, & MW-96) were also tested for the ' presence of 1,2 DCA and MTBE by EPA method 8260 These chemicals were not present in any of the samples at a detection limit of 5 ppb ' Sanple I D Benzene Toluene Ethyl Xylene TPH- TPH- Benzene Gasoline Diesel MW 11-35' 37,8000 232,000 71,500 298,000 5,420 ND ' MW11-45' 32,900 164,000 42,500 176,000 4,030 ND MW1150' 2,130 1 9,000 1,900 7,720 217 ND MW1155' ND ND ND ND ND ND MW 11-69' ND ND ND ND ND ND ' MW11-96' ND 4 ND 4 ND ND Drilling Mud 36 106 33 103 5 ND MDL 3 3 3 3 1 5 ' Units i IK /K /K ti/Kg mg/Kgmg[Kg m /K After drilling was completed, a sample of the drilling mud was collected for ' analysis This was done for the purpose of evaluating the possibility of the mud cross contaminating what would otherwise be uncontaminated sample materiel Groundwater Analysis During drilling, the SimulProbe tool was used three times for the purpose of obtaining soil and groundwater samples As discussed above, the sample points ' were located at the 55, 69, and 96 foot levels No water sample was obtained at the 55 foot sample due to the low permeability of the clay at that interval and ' the subsequent lack of water entry Suitable groundwater samples were, however, obtained at the 69 and 96 foot sample points The samples were submitted for analysis under chain-of-custody protocol to a mobile laboratory located on the site The lab was owned and operated by TEG, a State Certified analytic laboratory The samples were tested for the presence of benzene, toluene, ethylbenzene, and xylene (BTEX) using EPA method 602, and Total Petroleum Hydrocarbon as gasoline (TPH-G) by EPA method 5030/8015m As directed by the San Joaquin County PHS/EHD, the samples were also screened for the presence of MTBE by Method 602 Several soil samples were also subjected to laboratorytesting to document certain geo-technical characteristics of the soil This testing was performed in ' anticipation of possible future vapor extraction based remedial action, as well as "fate and transport" modeling which may be needed if a Risk Based Corrective Action (RBCA) approach is used as a part of the final remedial action These results will be more fully described in the forthcoming report documenting the pilot testing and feasibility study which is currently under way 2937 Veneman Ave ,#13240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293