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Working To Restore Nature of all soil samples collected at the subject site to date are summarized in Table 1 Laboratory reports of soil analytical results for samples collected in October 1993 are presented in Appendix D 1 6.3 Groundwater Gradient The new wells, MW-2, MW-3 and MW-4 were surveyed and tied into the existing well MW-1 Depth to water measurements were collected prior to development on October 18, and again on ' December 3 and December 10, 1993 The groundwater gradient was determined utilizing the December 10, 1993 data The hydraulic gradient was 0 002 ft/ft to the west Well MW-1 was ' not used in gradient calculation due to a bent casing 6,4 Laboratory Results - Groundwater Groundwater samples were collected after development and purging of newly installed monitoring wells MW-2, MW-3, MW-4, and purging of the previously existing well MW-1 ' Groundwater samples were analyzed for BTEX, TPHg and TPHd by Sequoia Analytical Total extractable petroleum hydrocarbons, reported as non-diesel mix and discrete peaks, were present ' above method detection limits in well MW-3 and MW-4 at 86 µglf and 330 µg/f, respectively. No gasoline petroleum hydrocarbon analytes were detected at or above method detection limits. 7.0 REMEDIAL INVESTIGATION ' On October 22, 1993, RESNA conducted a one-day soil vapor extraction test (VET) using newly installed vapor extraction wells VW-1, VW-2, and VW-3 The vapor extraction test was ' conducted to obtain data to determine the feasibility of vapor extraction at this site, to determine the effective radius of influence; to select the optimum off-gas abatement process, and to develop ' engineering design criteria for the construction of a soil remediation system at the subject site The scope of work included notification of the San Joaquin Valley Unified Air Pollution Control District prior to performing the test, performing a VET using three vapor extraction wells, 15004718-031594 FNL 8