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22 Soil Borings and Groundwater Monitoring Wells On January 5 and 6, 1999, V&W Drilling (C-57 #720904) drilled five soil borings at the site, three of which were converted to groundwater monitoring wells The locations of the soil borings and monitoring wells are shown on Figure 2 2 2 1 Soil Borings, Soil Sampling and Analysis All five of the soil g borings were drilled with a truck-mounted ri equipped with 8-inch outside- diameter hollow-stern augers The first three soil borings were drilled to a total depth of 5 feet bgs and converted to groundwater monitoring wells The fourth soil boring (designateas continuously cored and drilled to a total depth of 55 feet bgs The fifth soil boring (designated B- 3) was drilled to a total depth of 50 feet bgs and was not continuously cored During the drilling of the continuously cored soil boring (B-2), soil samples were collected at least every five feet and at observable changes in soil type The soil samples were collected directly from the core using a rubber mallet and 2-inch diameter by 6-inch long brass sleeves In the other four soil borings, soil samples were collected at five-foot intervals using a modified California split- spoon sampler lined with 2-inch diameter by 6-inch long brass sleeves In the field, a geologist logged each of the soil samples for geologic and hydrogeologic characteristics and screened each sample for organic vapors using an organic vapor monitor, equipped with a photoionization detector(PID) The soil boring logs including PID measurements are included in Appendix C Based on field observations and PID measurements, three soil samples from each of the five soil borings were transported in an iced cooler under chain-of-custody documentation to Kiff Analytical, LLC (Kiff), a state of California certified hazardous waste testing laboratory (DOHS Certification #2236) Kiff analyzed each of the fifteen soil samples for TPH-as-gasoline, BTEX, Methyl tertiary butyl ether (MTBE), Di-isopropyl ether (DIPE), Ethyl tertiary butyl ether (ETBE), Tertiary amyl methyl ether (TAME) and Tertiary butanol (TBA) by EPA Method 82608 The soil sample with the highest PID measurement from each of the five soil borings was also analyzed for total lead by EPA Method 6010 22 2 Monitorin Well Construction Develo meat and Elevation Surve As indicated, the first three soil borings were drilled to a total depth of 50 feet bgs and converted to groundwater monitoring wells Each of the wells was constructed with 20 feet of two-inch diameter, Schedule 40, flush-threaded and machine-slatted (0 020-inch) polyvinyl chloride (PVC) 7