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r <br /> 20 June 1996 <br /> AGE-NC Protect No 95-0137 <br /> Page 2 of 4 <br /> ' were detected in samples collected during the investigation On 14 August 1995, five additional soil <br /> borings were drilled at the site under the direction of AGE Two of the borings were completed as <br /> ground water monitoring wells Petroleum hydrocarbons were detected in soil samples collected <br /> ' during the investigation at concentrations as high as 1,900 parts per million (ppm, reported as <br /> milligrams per kilogram), hydrocarbons were detected in ground water samples at concentrations <br /> as high as 450,000 parts per billion(ppb, reported as micrograms per Mer) <br /> r <br /> 3.0. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 18 April 1996, a Solinst water level meter was used to measure the depth to ground water in <br /> wells MW-1 through MW-5 The relative groundwater elevation in each well and hydraulic gradient <br /> ' were calculated from these data (Table 1) Each monitoring well was purged of approximately 10 <br /> gallons of water (a minimum of three well volumes) using a pre-cleaned, two-stage, submersible <br /> pump Temperature, pH, and conductivity were measured at approximately one-gallon intervals <br /> using an ICM Water Analyzer Model No 52200 Purge water stabilization data and field data sheets <br /> are included in Appendix A Purged water was stored on-site in 55-gallon drums <br /> r3 2 GROUND WATER SAMPLE COLLECTION <br /> After stabilization,water samples were collected from each well using new, clean, disposable plastic <br /> bailers The samples were transferred into 40-m1 EPA vials and 1-liter amber bottles Samples were <br /> stored in a chilled container and transported under chain-of-custody to Alpha Analytical Laboratories <br />' (AAL) in Ukiah, California Each sample was analyzed for TPH-g, TPH-d, methyl-tert-butyl ether <br /> (MTBE) and 13TE&X in accordance with EPA methods 5030/8015, 5030/8015m, 602 and 602, <br /> 1 respectively <br /> 4.0. FINDINGS <br /> 1 <br /> 4 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' Figure 3 illustrates the relative ground water elevation on 18 April 1996 Depth to ground water at <br /> the site ranged from 18 70 to 19 02 feet bsg The data indicates an average increase in ground water <br /> elevation at the site of 0 6 feet since January 1996 <br /> Historically, ground water flow direction at the site has vaned from northwest to southeast with a <br /> 1 <br /> r <br />