ARCHIVED REPORTS XR0001188 - Laserfiche WebLink

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4.2 Groundwater Monitoring Well Installation ' Based on subsurface conditions using a PTD and field observations, borings B-IR was converted to groundwater monitoring well MW-1R The boring was drilled to 53 feet bgs The monitoring well was installed to evaluate the groundwater flow direction and whether ' hydrocarbons were present in groundwater beneath the site The monitoring well location is shown on Figure 2 Well construction information is presented in Appendix B ' 4.3 Vapor Extraction Well Installation ' Based on subsurface conditions using a PID and field observations, borings B-3R through B-5R were converted to dual-completion vapor extraction wells VW-1 through VW-3, respectively The dual completion wells consist of two 2-inch-diameter casing installed in ' the same boring to allow placement of two separate screen intervals Boring B-6R was converted to vapor extraction well VW-4 The borings were drilled to depths of 40 feet ' bgs Well completion information is presented in Appendix B 4.4 Well Development and Sampling ' On September 26, 1996, an EMCON technician measured depth to groundwater with an od/water interface probe in well MW-IR No floating product was observed, therefore, the well was developed Well development procedures are presented in Appendix A On September 30, 1996, an EMCON technician collected a groundwater sample for subjective and laboratory analyses of hydrocarbons EMCON's sampling and analysis procedures are presented in Appendix A ' The groundwater purged during development and sampling was stored in Department of Transportation 17H 55-gallon drums On October 24, 1996, the purge water was removed ' by IWM of Milpitas, California., and disposed of at an appropriate disposal facility 4.5 Laboratory Analyses ' Select soil samples collected from borings B-1 R through B-6R and the composite sample (SP-1) collected from the soil stockpile were submitted to Sparger Technology, Inc of Rancho Cordova, California, and analyzed for total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total xylene isomers (BTEX), and methyl ' tert-butyl ether (MTBE) using Modified U S Environmental Protection Agency (USEPA) Methods 8015 and 8020, respectively In addition, composite sample SP-1 was analyzed for total lead, using USEPA Method 7410 Samples collected from soil borings B-2R and B-6R were analyzed for total oil and grease (TOG) using USEPA Method 5520 D and F, 5ACN\P72\2613\2613100011313 9fib2 Rev 0 2/5/97 22613-100 001 4-2 r