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I <br /> rojeci\26 3-075\sa wk p1 <br /> One sample,taken from 18 feet(approximate maximum depth of former tank <br /> excavation) <br /> One sample, to be selected from the depth interval of 20 feet to the ground- <br /> water level (about 35 feet) <br /> One sample, to be selected from the depth interval of ground-water level to <br /> 10 feet below ground-water level. <br /> SoiI samples will be analyzed for Total Petroleum Hydrocarbons as diesel (TPH-d), <br /> prepared by sonnication extraction (Preparation No. 3550) with analysis by gas <br /> chromatograph/flame ionization detection(GCFID)--EPAanalytical Method 8015-modified, <br /> and for Benzene, Toluene,Total Xylenes and Ethyl Benzene (BTXE),prepared by purge <br /> extraction (Preparation No. 5030) and GCFID--EPA Method 8020. Soil samples will be <br /> submitted for analysis at aCalifornia-certified analytical laboratory under Chain-of Custody <br /> protocol. The contract laboratory will provide analysis results with detection limits of 1 <br /> milligram per kilogram (mg/kg, or parts per million -ppm)for TPH-d and 0.005 ppm for <br /> BTXE (Regional Board, 1989). <br /> Task 7. Develop Monitoring Wells-ESSE or the driller will develop each monitoring well <br /> by surging, bailing and/or pumping, not less than 48 hours ifter the well seals have been <br /> placed. For a description of well development procedures please refer to the ESE Standard <br /> Operations Procedures (Attachment B). ESE will supervise well development procedures, <br /> and record observations in a field log. Well development field logs will be reviewed by an <br /> ESE California Registered Geologist. <br /> Task 8. Survey Well Locations and Elevations-ESE will survey the location and elevation <br /> of the monitoring wells installed for this investigation. The survey height determinations <br /> 7 <br />