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URS Ms Vickie McCartney, REHS Page 5 . San Joaquin County Environmental Health Department ARCO 2186 On May 5, 2004, Stratus collected groundwater samples from the newly installed deep groundwater monitoring well and the new AS well Groundwater samples were analyzed for GRO, BTEX, and fuel oxygenates/additives by U S EPA Method 8260B Groundwater sampling field sheets are included in Attachment F Y On May 10, 2004, lateral positions and the tops of casing elevations for the wells were surveyed by Morrow Surveying of West Sacramento, California Survey data are included as Attachment G Soil Analytical Data GRO was detected in one soil sample, at a concentration of 0 73 milligrams per kilogram (mg/kg), at 50 r feet bgs in AW-1 BTEX compounds were not reported at or above laboratory detection limits in any 1 soil samples analyzed from the soil borings MtBE was detected in samples from 50 feet bgs in AW-1�8#� j and BH-3 at 0 86 mg/kg and 0 63 mg/kg, respectively'Tert-amyl methyl ether (TAME) also was detected in the samples from 50 Feet bgs in AW-1 and BH-3, at concentrations of 0 013 mg/kg and 0 0081 mg/kg,'respectively Tert-butyl alcohol (TBA) also was detected at concentrations of 0 26 and 0 18 mg/kg in samples collected from 50 feet bgs in 1314-2 (AW-1) and BH-3 '§oil analytical data are presented in Tables 2 and 3 Laboratory analytical reports and chain-of-custody documentation are included in Attachment H r- Groundwater Analytical Data . MtBE was reported in groundwater samples from MW-8 and AW-1 at concentrations of 2 3 µg/L and 150 µg/L, respectively All other analytes were reported at or below laboratory detection limits for the groundwater sample collected from MW-8 The water sample from well AW-1 was reported to have detectible concentrations of GRO, benzene, and total xylenes, at concentrations of 97 µg/L, 6 3 ttg/L, and 8 0 pg/L, respectively Groundwater analytical data are presented in Tables 4 and 5 Laboratory analytical reports and chain-of- custody documentation are included to Attachment H Soil and Wastewater Disposal Soil cuttings and wastewater generated during the drilling activities were placed in a labeled, DOT- approved, covered roll-off bin, and 55-gallon DOT-approved steel drums and stored on site, pending disposal A composite soil sample was collected from the soil cuttings and submitted to the Sequoia Analytical Laboratory in Petaluma, California, for analysis of GRO, BTEX, and total lead Dillard Environmental Services hauled the soil to the Republic Services Vasco Road landfill in Livermore, California, where it was disposed of as non-hazardous waste Stockpiled soil laboratory analytical reports are included in Attachment H Wastewater generated during drilling activities was hauled to InStrat, Incorporated, in Davis, California, for disposal Soil and water disposal documentation is included in Attachment I J K IWprocessW BP ARC010218612004 AssessmentV2eport 04 doc