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2.3 Monitoring Well Installation and Sampling <br /> li <br /> Eight soil borings were drilled on April 27 and 28, 1994. Three of the borings were <br /> completed as 2-inch groundwater monitoring wells. A total of 14 soil samples were analyzed <br /> for total petroleum hydrocarbons (TPH as gasoline aild diesel) and volatile aromatics <br /> (BTE&X). TPH as gasoline was detected in ten of the samples at concentrations to 3,800 <br /> mg/kg (parts per million, 'ppm). TPH as diesel was detectedin twelve of the samples at <br /> concentrations to 9,000 ppm. Concentrations of benzene,�itoluene, ethylbenzene, and xylene <br /> were detected in the soil samples as well. ' <br /> I <br /> Groundwater samples have been collected in May,August[and November 1994.The samples <br /> were analyzed for TPH as gasoline, TPH as diesel and B IE&X. TPH as gasoline have been <br /> detected in all three monitoring wells at concentrations to 14,1000 ppm. TPH as diesel has <br /> been detected in all three wells at concentrations to 12,000 ppm. BTE&X have consistently <br /> been detected in MW-2. <br /> i' <br /> 2.4 Groundwater Depth and Gradient Direction <br /> I <br /> The depth to groundwater at the site is approximately 20 feet. The groundwater gradient <br /> has been very shallow, approximately 0.0004 ft/ft. The flow direction at the site fluctuates <br /> between northwest and southwest. <br /> 3.0 SCOPE OF NVORKi <br /> In a letter dated October 19, 1994, the PHS/EHD requested "a work plan to install <br /> additional monitoring wells and soil borings to deterinine the extent of the soil and <br /> groundwater contamination plumes". Therefore, GeoAudit proposes to install two additional <br /> monitoring wells and two or three soil borings at the sited One well will be located at the <br /> northwest corner of the property. A second well will be located immediately south of the <br /> former diesel tank pit near borings B7 and B8. <br /> If field screening of soil samples collected from the proposed monitoring well near the <br /> northwest corner of the RFS property does not indicate the presence of organic vapors, then <br /> an additional soil boring will be drilled approximately 30{feet west of MW-2 to determine <br /> the lateral extent of impacted soil in this area. <br /> Two soil borings will be drilled on the Jimco Truck Stop property. One of the borings will <br /> be drilled north of MW-2, near the southwest corner of the'Jimco building. A second boring <br /> will be placed north of MW-3, near Jimco's abovegroun, storage tanks. A groundwater <br /> sample will be collected from each boring using a hydro punc} (or similar method). The <br /> proposed locations of the wells and soil borings are .illust ated in Figure 2. <br /> i <br /> I <br /> cm6�Ca1 A.J-x,lk�N- <br /> RI2 �I <br /> PON FARM URNICe 1 WP(2-9$&r,91-R3-y13-OQ <br /> I <br />