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groundwater samples will be analyzed by a CAL�EPA certified analytical <br /> laboratory for TPH-G, BTEX, and MTBE. <br /> Results of these tests, as well as all data collected during this test, will be <br /> presented in a report. <br /> TASK 13 — COATDUCT A VAPOR EXTRACTION TEST FOR THE SITE <br /> Vapors will be extracted from the extraction well using a regenerative <br /> blower. The hydrocarbon-laden vapors will be abated by vapor phase <br /> activated carbon. The radius of vacuum influence in the vadose zone will <br /> be determined by measuring negative pressure in surrounding wells. The <br /> flow from the blower in cubic feet per minute (cfm) and negative <br /> pressure in the surrounding wells will be logged every 15 minutes for the <br /> duration of the test. <br /> Vapor samples will be collected from the extraction well in Tedlar bags at <br /> the beginning and at the end of the test. These samples will be analyzed <br /> for TPH-G, BTEX and oxygenates by EPA Method 8260. In addition, the <br /> influent vapor stream will be measured using a hand-held OVM at periodic <br /> intervals during the test. <br /> TASK 14 - CONDUCT AN AIR SPARGING TEST <br /> An air sparging test will be conducted to determine whether air sparging <br /> may be an effective method of remediation for the site. The air sparging <br /> test will be conducted by injecting compressed air into the air sparging <br /> well at a rate of approximately 20 to 30 cubic feet per minute (cfm). <br /> Pressure and water levels in the surrounding wells will be monitored to <br /> determine whether there is any pressure increase in the vadose zone or <br /> mounding of the water table. <br /> TASK 15 - PREPAREA SUBSURFACE ASSESSMENT REPORT <br /> Based on the results of the tests outlined above, ASE will prepare a <br /> corrective action plan (CAP) for the site. This report will include a <br /> summary of the results, the site background and history, description of <br /> the well construction, development and sampling, tabulated soil and <br /> groundwater analytical results, isoconcentrations maps, conclusions and <br /> recommendations. This CAP will also present several possible remediation <br /> strategies for the site including pump and treat, air sparge/vapor <br /> extraction, dual phase extraction, in-situ bioremediation and others. Pros <br /> and cons or each method will be discussed, costs compared, and a <br /> 574 West Grand Line Road, Tracy, CA Workplan — April 2001 <br /> -12- <br />