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i .. uuUGERS GESwRERS LCNSULiANE .,, <br /> 2.0 ME MODOLOGY <br /> 2.1 SOIL BORING AND SAMPLING <br /> f I <br /> Four soil borings were completed for the investigation(Figs' re 2). Borings were located through <br /> the former UST location (SB-1), down-gradient of the former UST location (SB-2), up-gradient <br /> -4 Soil borings were originally <br /> of the former UST (SB-3), and adjacent to the former US T%(SB-4). g + <br /> going to be,completed using direct push means. However, during the completion of the first <br /> L <br /> boring (SB-3) the sampler could not be pushed beyond Ii30 feet below ground surface (bgs) <br /> because of tight soil conditions. Borings were completed using hollow stem augers. Borings <br /> SB-1, SB-2,,and SB-3 were drilled to where water was first encountered at 65 feet bgs. Boring <br /> SB-4 was drilled to 45 feet bgs. <br /> All down-hole drilling equipment, including hollow stemaugers, drilling rods, and split spoon <br /> iI <br /> samplers, were decontaminated prior to use with a steam cleaner. All soil borings were <br /> backfilled with cement grout. <br /> Soil samples were collected eve 5 feet using a 2-inch di��meter split spoon sampler lined with i <br /> P every g <br /> three 6-inch brass rings. Soil samples were lithologically described on WESTON's borehole <br /> logging forms and screened with an HNU photoionizatioln detector (PID) for volatile organic <br /> vapors (see' boring logs in Appendix A). Soil samples were chosen for analysis based on <br /> SJCPHS's requirement to have two consecutive non-detect samples for determining the extent <br /> of soil contamination. <br /> Soil samples chosen for analysis were capped with plastic end caps placed over Teflon sheeting. <br /> The samples" were then laced in individual plastic sealable bas and laced in an insulated <br /> C p ' p P g P <br /> cooler on ice. Samples were delivered by the field geologist to American Environmental <br /> r <br /> Network inPleasant Hill, California for analysis. <br /> L <br /> 2.2 GROUNDWATER SAMPLING <br /> Two groundwater samples, one at 45 feet bgs and one at'I65 ft bgs, were planned at each soil <br /> boring location. However, only one groundwater sample was collected from each boring <br /> ! it <br /> because grondwater was lower than expected. A groundwater sample was not collected from <br /> SB-4 because of its close proximity to SB-1. <br /> II <br /> L:\....\PEPBOYS\WMLN.REP 5 Nov.IM <br />