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Mr Chuck Carmel March 10, 1994 Page 2 The wells were drilled and constructed between October 11 and October 19, 1993 BC personnel were on site to oversee the drilling, sampling, and construction of the wells The wells were installed by Wayne Drilling Company of Lincoln, Cahfortua, using a truck- mounted hallow-stem auger ng equipped with 12-inch-diameter bits and drill stems (8-inch- diameter bits and drill sterns were used for drilling the sparge well boreholes) The borehole logs are presented as Appendix B of,this report The groundwater monitoring well boreholes were drilled to a depth of 30 feet below ground surface The soil vapor extraction and air sparge well boreholes were drilled to a depth of approximately 25 feet below ground surface Well construction details for all wells are presented in Table 1 Groundwater was encountered in the boreholes between 15 and 21 feet below ground surface during drilling The groundwater stabilized at between 15 and 18 feet below ground surface after the wells were installed Lithology of the boreholes was classified by collecting soil samples every 5 feet from selected soil boreholes using a 2-inch-diameter by 18-inch-long modified-drive sampler The boreholes of MW-1 and V-7 were continuously cored The general lnthology consisted of clay in the upper 4 to 8 feet Below 4 to 8 feet to the total depth of the boreholes, the lxthology consists primarily of sand and silty sand with significant (up to 6-feet thick) silt and clay lenses Soil samples were collected every 5 feet above groundwater in the borehole for lxtholognc identification and laboratory analysis The sampling methods used are described in Attachment A of the work plan Drill cuttings generated during drilling were temporarily stockpiled on plastic sheeting A composite soil sample of the stockpile was collected for laboratory analysis The borehole soil samples were analyzed for benzene, toluene, ethylbenzene, and xylene (BTEX), and for total petroleum hydrocarbon as gasoline (TPH-G) by U S Environmental Protection Agency (EPA) Methods 8020 and modified 8015 with extraction by EPA Method 5030 The composite soil s*ple from the stockpiled soil was also analyzed for these constituents, as well as, STLC lead as per Title 22 The stockpiled soil was removed from the site by Dullard Trucking Company The groundwater monitoring and vapor extraction wells were developed by BC personnel on October 19 and 20, 1993, by surging, bailing, and pumping until clean, relatively sediment- free water was generated Approximately 440 gallons of water were generated during the development The development water was temporarily stored in 55-gallon drams on site The water and drums were removed from the site by Integrated Wastestream Management r Use or disclosure of data contained on this sheet is subject to the rest?utton specified at the beginning of this document 03110/94\769ciu-PORTS\WELLSNSTAPT