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Mr Lawrence H Beasley Project 22611-100 001 July 18, 1997 Page 3 ADDITIONAL SUBSURFACE INVESTIGATION From October 23 through 25, 1996, the following activities were performed to verify the presence of residual hydrocarbons remaining beneath the site An EMCON field geologist observed Westex Drilling of West Sacramento,California,drill two on-site soil borings(CB-I and CB-2),which were drilled to approximately 55 feet bgs Boring CB-1 was converted to a vapor extraction well (VEW-2) and boring CB-2 was grouted to surfaced using neat cement Groundwater was not encountered in the borings EMCON's field procedures are presented in Appendix B Continuous soil samples were collected using a core barrel sampler Samples were collected 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 Borings(see Appendix C) Drill cuttings were stockpiled on site and covered with plastic sheeting On October 25, 1996, an EMCON geologist collected soil samples (one composite of four samples) from the stockpiled soil for analyses to evaluate disposal options Drill cuttings were transported by Manley and Sons, Inc , of Sacramento, California, to the Forward Landfill in Manteca,California,for disposal Select soil samples collected from the borings and the composite sample from the stockpiled soil were analyzed for TPHG, and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using U S Environmental Protection Agency (USEPA) Methods 50301801518020 Two soil samples were analyzed for total organic carbon (TOC) In addition, the composite sample from the stockpiled soil samples were analyzed for total lead The soil samples were analyzed at Sparger Technology in Rancho Cordova, California Analytical results and chain-of-custody records are presented in Appendix D Residual hydrocarbons were detected in the soil samples collected from soil boring CB-1 TPHG concentrations ranged from below laboratory detection limits to 1,190 ppm Benzene concentrations ranged from below laboratory detection limits to 2 9 ppm Residual hydrocarbons were below laboratory detection limits for soil boring CB-2 with the exception of TOC, which was detected at 354 ppm Results of laboratory analyses are presented in Table 2 In addition,three distinct soil samples collected from soil boring CB-I at 20, 30 and 45 feet bgs were submitted to Raney Geotechnical Laboratory in West Sacramento, California,for assessment of geotechnical parameters Based on geotechnical data obtained from the soil samples, the soil beneath the site has a permeability ranging from 3 24 x 10-3 to 3 33819 SACK\2611CLOS URE-951dms 1