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a depth of approximately 30 feet below grade and subsequently converted to groundwater momtonng wells Monitoring well locations are shown on Figure 2 Laboratory analysis of soil samples collected from the three borings determined that petroleum 1 hydrocarbon constituents were detected in the soil within 4 to 5 feet of the static water levels beneath the site Laboratory analysis of groundwater samples collected from the wells subsequent ' to development indicated that gasoline constituents were present above laboratory method detection limits in the groundwater samples collected from each site monitoring well Initial 1 groundwater monitoring data (March 1992) determined the groundwater flow direction to the south A detailed discussion of the initial subsurface investigation can be found in RESNA's 1 "Interim Problem Assessment Report, Soil and Groundwater Contamination," dated June 8, 1992 In July 1994, a RESNA field geologist observed the drilling of four additional groundwater monitoring wells (MW4, MW5, MW6, and MW7) at the site to further characterize subsurface conditions Groundwater samples collected from these additional wells contained no detectable 1 petroleum hydrocarbons A detailed discussion of the Phase 2 Subsurface Investigation can be found in RESNA's "Summary Report, July 1994 Investigation," dated August 26, 1994 1 ' The lateral extent of groundwater contamination within the uppermost water bearing zone at the subject site has been defined as a result of subsurface investigations conducted to date Analytical results of soil collected from site borings are summarized in Table 1 In a letter received from the PHS/EHD dated March 1995, permission was given to sample wells ' MW3 and MW4 and wells MW5, MW6 and MW7 on an alternating semi-annual basis Wells MW 1 and MW2 were to be sampled every quarter, conditions permitting • w 194334Vepotis`sumr tdoc 2 • 1 SN�I'H