ARCHIVED REPORTS_XR0012712 - Laserfiche WebLink

Home Browse Search

NO ti 2. ACTIVITIES APRIL THROUGH JUNE 19 91 Groundwater Sampling, 10 June 1991 The eight monitoring wells were gauged, and MW1, MW2,MW6,MW7, and MW8 (Figure 2)were sampled. MWd and MW5 were dry,and MW3 did not have enough water to sample. Samples hydrocarbons. sumitted under chain of custody to Pace Incorporated and were analyzed for petro Vapor Extraction A vapor extraction and treatment system is operating to remediate soils beneath the former tank field. 3, PLANNED ACTIVITIES JUNE THROUGH SEPTEMBER 1991 Groundwater will be sampled in September 1991, and samples will be analyzed for petroleum hydrocarbons to satisfy quarterly reporting requirements. 4, DEFINITION OF PETROLEUM: HYDROCARBONS IN THE SOIL F�= Tank Closure Samples 3 tank removal in - m the tank Soil samples were collected froCooncentrations, at the tme of e of Total PetroleumHydrocarbons as - February 1986 (S-1 to S-6, Figure 3). ere detected in soil samples collected from the gasoline (TPH-g) to 4,600 mg/kg (Table 1) w excavation. The reports of the early investigations completed by Groundwater Technologies,Inc. indicated that the amount of affected soil was "minor" and its distribution was "localized" (GTI report to Exxon, March 1986). F Soil Borings Soil samples have been collected from soil borings that were completed as monitoring wells or were drilled specifically for soil sampling (see Figure 3). The results of the analyses of these samples are shown in Table 1 (for MW3-MW5,drilled TPH-9 greater a Than 2 (mg7 and than have B obeen MW6 -MWS, drilled by EA). Na concentrations o g measured in soil samples from these borings. Soil Vapor Surveys Two soil vapor surveys have been conducted at this site,one by Eto 1 in 1987rand oo�otaY EVAX e in 1990. The EVAX soil beneath indicated teethe presence tank field.pThese9re�su0itswere used by EVAX hydrocarbons to the_soivapor to design a soil venting remedial plan. 2 w P51 f 71050(1)1 QT R A U'91 n X-4 - - -