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16 April 1997 <br />AGE -NC Project No 95-0121 <br />Page 7 of 9 <br />serve to approximate remaining petroleum hydrocarbon Ievels 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 1 INSTALLATION OF SOIL VAPOR EXTRACTION WELLS <br />The following procedures will be performed for the installation of soil vapor extraction 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 Environmental Public Health Services - Environmental Health <br />Division (PHS-EHD) 48 hours prior to commencement of any work, while securing proper <br />city/county soil boring permits <br />3 Boring locations will be marked at least 48 hours in advance for an Underground Service <br />Alert (USA) check of underground utilities or pipes <br />4 Advance five soil borings to a total depth of approximately 20 feet bsg utilizing a truck- <br />mounted drill rig, and 8 25 -inch diameter hollow stem augers Soil boring locations are <br />depicted on Figure 4 <br />5 Steam -clean hollow stem augers before advancing into boring <br />6 Complete each soil boring as a soil vapor extraction well The boring will be completed using <br />2 -inch diameter slotted PVC screen from an approximate depth of 5 to 20 feet bsg Blank <br />PVC screen will be used from 1 -foot to a depth of 5 feet bsg A filter pack will be installed <br />utilizing a # 3 sand from depths of 4 -feet to a depth of 20 feet bsg, while a bentonite plug will <br />be placed from depths of 2 -feet to a depth of 4 feet bsg Each well will then be backfilled to <br />approximately 1 foot bsg with Portland cement SVE well construction diagrams are depicted <br />in Figure 5 <br />7 Cuttings and rinseate generated during drilling activities will be containerized in properly <br />labeled D 0 T model 17H 55 -gallon drums, and stored on-site in an area inaccessible to the <br />general public Disposal alternatives will be evaluated based on results of laboratory analyses <br />C7 <br />