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4.2 Vapor Extraction Well Installation <br />! Based on subsurface conditions using a FID and field observations, soil boring B-1 was <br /> converted to vapor extraction well VW-1 The boring was drilled to a depth of <br /> 26 feet bgs Well construction information is presented in Appendix B <br /> I <br /> 4.3 Groundwater Monitoring Well Installation <br /> Based on subsurface conditions using a FID and field observations, soil bonngs B-2 and <br /> B-3 were converted to groundwater monitoring wells MW-1 and MW-2, respectively The <br /> borings were drilled to 38 5 feet and 40 feet bgs, respectively The monitoring wells were <br /> installed to evaluate whether hydrocarbons were present in groundwater beneath the site <br /> The monitoring well locations are shown on Figure 2 Well construction information is <br /> presented in Appendix B <br />! 4.4 Well Development and Sampling <br /> On March 4, 1997, an EMCON technician measured depth to groundwater with an <br />! oil/water interface probe in wells MW-1 and MW-2 No floating product was observed, <br /> therefore, the wells were developed Well development procedures are presented in <br /> Appendix A <br /> On March 6, 1997, an EMCON technician collected groundwater samples for subjective <br /> and laboratory analyses of hydrocarbons EMCON's sampling and analysis procedures are <br />' presented in Appendix A <br /> The groundwater purged during development and sampling was stored in Department of <br />! Transportation 17H 55-gallon drums On April 5, 1997, the purge water was removed by <br /> IWM of Milpitas, California, and disposed of at an appropriate disposal facility <br />! 4.5 Laboratory Analyses <br />! Select soil samples collected from borings B-1 through B-3, and the composite sample <br /> S-0225-IAB collected from the soil stockpile, were submitted to Excelchem <br /> Environmental Labs of Roseville, California, and analyzed for TPHG, benzene, toluene, <br />! ethylbenzene, and total xylene isomers (BTEX), methyl tert-butyl ether (MTBE) using <br /> Modified U S Environmental Protection Agency (USEPA) Methods 8015 and 8020, <br /> respectively, and total lead using USEPA Method 7420 One soil sample collected from <br /> boring B-2 was analyzed for permeability, moisture content, bulk density, and total <br /> organic carbon (TOC) <br /> i <br /> S A(\N\PJZ\2605\2605 1010 1 B 97\cjb 2 Emcon <br /> 22605-101 001 4-2 Rev 0 8/4/97 <br />