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11 August 1997 <br /> AGE-NC Project No. 95-0118 <br /> Page 7 of 9 <br /> "down time"for the unit. One to two times each month(assuming 24-hour operation),the unit will <br /> be shut down for routine maintenance procedures such as lubrication, oil changing, and: system <br /> adjustments. <br /> 3.5. CONFIRMATION SOIL SAMPLING <br /> After approximately six months of operation or efficiency of the unit has declined, confirmation soil <br /> sampling should be performed withing the area of impacted soil.The confirmation soil borings will <br /> serve to approximate remaining petroleum hydrocarbon levels.and determine if continuing remedial <br /> operation is necessary. Samples should be collected using direct push technology,hollow-stem auger <br /> drilling, or equivalent. <br /> 4.0. PROCEDURES <br /> 4.l. INSTALLATION OF SOIL VAPOR EXTRACTION AND AIR SPARGING WELLS <br /> t = = The following procedures will be performed for the installation of remediation wells: <br /> 1. Prepare a Site Health and Safety Plan in accordance with the Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for <br /> Occupational Safety and Health, Occupational Safety and Health Administration,U.S. Coast <br /> Guard and U.S. Environmental Protection Agency, October 1985. <br /> 2. Notify the San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD) 48 hours prior to commencement of any work, while securing proper <br /> city/county soil boring permits. <br /> 3. Mark boring location at least 48 hours in advance for an Underground Service Alert(USA) <br /> check of underground utilities or pipes. <br /> 4. Advance one soil boring to a total depth of approximately 35 feet bsg utilizing a truck- <br /> mounted drill rig and 8.25-inch diameter hollow stem augers. Also advance four additional <br /> .soil boring to'a depth of 45 feet bsg. Soil boring locations are depicted on Figure 2. <br /> 5. Stearn-clean hollow stem augers before advancing each boring. <br /> 6. Collect soil samples at 5-foot intervals in each boring beginning at a depth of 5-feet bsg. <br /> Samples will be collected using a California split-spoon sampler loaded with three 2-inch by <br /> 6-inch brass sleeves. The sampler will bQ driven by dropping a 140-pound weight from a <br /> height of 30 inches. The number of blow required to advance the sampler in 6-inch <br /> Advanced GeoEnvironmental,Inc. <br />