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4 1 5 Soil Vapor Extraction Tests RESNA performed an SVE test in June 1991 to evaluate remedial alternatives for the site (RESNA, September 12, 1991) RESNA conducted the SVE test for approximately 6 hours using vapor extraction wells VW-1, VW-2, and VW-3 Results of the SVE test ' are summarized in Section 5 5 (Evaluation of the Soil Vapor Extraction Test) 4.2 Assessment of Groundwater 4.21 Groundwater Monitoring Well Construction To evaluate if petroleum hydrocarbons had impacted groundwater, three groundwater ' monitoring wells (MW-1 through MW-3) were installed in borings B-21 through B-23, respectively Construction details of the wells are shown on the logs of borings (see Appendix B) and are presented in Table 3 Monitoring wells were developed and ' sampled according to the procedures presented in Appendix A The locations of the wells are shown on Figure 2 4.2.2 Groundwater Monitoring In response to the dissolved petroleum hydrocarbons detected in groundwater collected in March 1994, ARCO initiated a quarterly groundwater monitoring program The purpose of this work is to monitor the concentrations of dissolved petroleum hydrocarbons in L groundwater and to evaluate the direction of groundwater flow and the hydraulic gradient beneath the site Groundwater Technology, Inc , performed quarterly groundwater monitoring from June 1994 through December 1994 EMCON performed quarterly groundwater monitoring in 1995 and 1996 Work included measunng depths to water and L011eLting groundwater samples for subjective and laboratory analyses of petroleum hydrocarbon~ EMCON's field methods for groundwater monitoring are presented in ' Appendix A ' 4.3 Additional Site Assessment On June 7, 1995, an additional site assessment was completed The following activities were performed to evaluate the lateral extent of petroleum hydrocarbons north of the site and to prepare for possible remediation SA(W TEN0805\08051420 4RS-97yirc l Rev 0 3112/97 20805 142 004 4.3