ARCHIVED REPORTS XR0009910 - Laserfiche WebLink

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1 � AMR February 14, 1992 ARCO Service Station No 2130, Stockton, California 1 near the site There are no municipal, domestic, or irrigation water wells within 500 feet of the site Data obtained from the California Department of Water Resources indicates water-supply wells are within 1/2 mile of the site The wells are listed in Table 1 and depicted on Plate 1 Some of the wells are probably inactive, and other wells may exist near the site but do not appear in the records SUBSURFACE INVESTIGATION Details of the drilling operations, soil sampling, well construction and development, and water sampling are presented below Field work performed by RESNA on behalf of ARCO at the project site was conducted in accordance with RESNA's Work Plan (May 17, 1991), RESNA's Addendum to Work Plan (November 18, 1991), and Site Safety Plans No 30003- 1S (May 1, 1991) and 30003-4S (December-13, 1991) Our field methods and chain-of- custody protocol are described in Appendix A Copies of the Chain of Custody records and laboratory reports for soil and water samples are included in Appendix B Soil Borings and Soil Sampling In June 1991, RESNA observed Woodward Drilling of Rio Vista, California, drill one soil boring (131) near the fillport ends of the existing tank cavity to evaluate the soil for possible residual hydrocarbons Hydrocarbons were detected through soil sample field screening using a photoionization detector (PID), therefore, further drilling at the site was postponed until the site was added to the SJCPHS-EHD pilot program RESNA continued the subsurface investigation during December 1991 We observed Woodward Drilling drill four soil borings (B3, B4, B5, and B7) to approximately 65 feet below grade (approximately 1 foot below ground water) and three soil borings (B2, B6, and BS) to approximately 75 feet below grade The locations of the borings are shown on Plate 2 3"3-aw 3