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ti <br /> September 16, 1991 <br /> ARCO Service Station No. 2076, Lodi, California <br /> PREVIOUS'WORK <br /> Soil Borings and Soil Sam lin <br /> On October 3 and 4, <br /> Drilling was conducted at the site in October 1990 and July 1991. <br /> 1990, we observed Wayne Drilling Company of Lincoln. California, drill soil borings B-1 <br /> through B-S near the existing and proposed gasoline tank cavities (Plate 2). The purpose <br /> of the work was to evaluate soil for possible residual hydrocarbons before the existing <br /> underground tanks are removed (Applied GeoSystems. Inc.. December 17, 1990). On July <br /> 12, 1991, we observed Exceltech of Fremont, California, drill three 8-inch-diameter soil <br /> borings (B-6 through B-8) anti construct three vapor-extraction wells (VW-1, VW-2. and <br /> pose of the <br /> VW-3) in the borings. Boring and well locations are�jloo� of 1�vdrocarbons pnrnat ie still <br /> additional work was to evaluate whether remedi <br /> underlying the site is feasible by vapor extraction if remediation of soil is warranted at the <br /> ate' <br /> site in the future. <br /> Field work for both drilling events was conducted according to Applied GeoSystems Work <br /> 19941, and 30008-4W (\fay 24, 1991). These work plans <br /> Plans 30008-1W (September 5, <br /> were approved by the SJCPHS-EHD. <br /> ately 3-foot intervals and were <br /> During drilling, soil samples were collected at approxim <br /> classified according to the Unified Soil Classification System (Plate Al. Appendix A). <br /> Descriptions of materials encountered are presented in the Logs of Borings (ol..Ites 2 <br /> through A17. Appendix' A). The materials consisted predominately of fin <br /> grained sand and silt. <br /> The geologist used a photoionization detector (PID) to evaluate the soil samples for <br /> hvdrocarbor.vapors. PID readings are also included on the Logs of Borings. <br /> 3OM8.3W <br />