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Mr Kyle Christie Project 0805-152 02 August 4, 1995 Page 3 Installed to a total depth of 80 feet bgs On July 5 and 6, 1995, a geologist from EMCON observed All Terrain Drilling drill two soil borings and Install two vapor extraction wells (VW- 19 and VW-20) Vapor extraction wells were installed to depths of 93 and 83 feet bgs, respectively Well VW-18 is screened from 43 5 to 72 7 feet bgs, well VW-19 is screened from 58 to 88 feet bgs, and well VW-20 is screened from 48 5 to 78 5 feet bgs Locations of the vapor extraction wells are shown on Figure 2 Groundwater was not encountered during drilling activities.EMCON field procedures are described in Attachment A The geologist collected soil samples from the bonngs at approximately 5-foot intervals for possible laboratory analyses and to characterize the geology beneath the site Samples were logged using visual and manual methods and classified according to the Unified Soil Classification System Sediments encountered are shown on the logs of exploratory borings presented in Attachment B Drill cuttings were stockpiled on site and covered with plastic sheeting On July 6, 1995, a geologist from EMCON collected two soil samples from the stockpiled soil to be composited at the laboratory for analyses to evaluate disposal options. At ARCO's request, drill cuttings were transported by Dillard Trucking of Byron, California, to Browning-Ferns Industries in Livermore, California, for disposal Laboratory Methods and Results Select soil samples from the bonngs and the composite sample from the stockpile were analyzed for total purgeable hydrocarbons (equivalent to TPHG) with benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) distinction using Environmental Protection Agency (EPA) Methods 5030/DHS LUFT/8020 In addition, the soil sample collected from the stockpile was analyzed for total lead, using EPA Method 305017421, reactivity, corrosivity and ignitabihty Samples were analyzed at Columbia Analytical Services, Inc , (CAS) in San Jose, California(California Department of Health Services Hazardous Waste Testing Laboratory Certification 1426) Copies of the chain-of-custody records and laboratory analysis reports are presented in Attachment C Results of laboratory analyses of soil samples collected from the borings indicated that TPHG concentrations ranged from below laboratory detection hmits to 16 ppm and benzene concentrations ranged from below laboratory detection limits to 0 26 ppm Results of analyses are shown in Table 1 i SALIN 1P1010805108051520 2BS-951pas i