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presence of organic vapors, using a PID, and the readings were <br /> recorded on the boring Jogs. The soil was then described in <br /> accordance with the Unified Soil Classification System (see Boring <br /> ILogs) . <br /> 3.3 Well Completion <br /> Borings #1 through #3 were completed as 2-inch groundwater <br /> monitoring wells (MW-1 through MW-3) . Each well was completed using <br /> 0. 020 screen from 23 to 38 feet. The filter pack (#3 sand) was <br />' installed from 21 to 38 feet. Bentonite pellets were used from 19 <br /> to 21 feet and the well was grouted to the surface with Portland <br /> Cement. Boring B-4 was grouted from total depth (28 feet) to the <br /> surface with cement. <br /> 3.4 Well Surveying and sampling <br />' On April 14 , 1993 , monitoring well casing elevations were surveyed <br /> relative to the domestic well on the property. This well was <br /> arbitrarily assumed to have a casing elevation of 100 feet. <br />' After surveying, the water level in each well was measured relative <br /> to the top of the casing. The relative piezometric levels and <br /> hydraulic gradient were determined from these data. <br /> After water levels were measured, a three-stage purge pump was used <br /> to surge and purge each well. Approximately 8 to 9 gallons of water <br />' (3 to 5 well volumes) were removed from each well to stabilize <br /> temperature, pH and conductivity (see Table 2) . The purge water was <br /> stored in 55-gallon drums on-site. Water samples were collected <br /> using disposable plastic bailers. The samples were collected in 40 <br /> ml EPA vials. <br /> 3.5 Laboratory Analysis <br /> Selected soil samples were analyzed for total petroleum <br /> hydrocarbons (TPH as gasoline) , purgeable aromatics (BTE&X) and <br /> total lead in accordance with EPA methods 8015m, 8020 and 7421, <br /> respectively. Water samples were analyzed for TPH as gasoline and <br /> BTE&X in accordance with EPA methods 8015m and 602 , respectively. <br /> Laboratory results and chains of custody for the soil samples are <br /> presented in Appendix A. Laboratory results and chains of custody <br /> for the water samples are presented in Appendix B. <br />' 4.0 FINDINGS <br />' 4.1 Stratigraphy <br /> The borings penetrated silty sand to sandy silt from the surface to <br />' a depth of approximately 30 feet. A thin layer of grey-brown silty <br /> clay was encountered at a depth of approximately 30-34 feet. <br />' 3 <br />