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03 July 1997 <br /> AGE-NC Project No 95-0130 <br />' Page 8 of 9 <br />' utilizing five feet of screen from 55 to 60 feet bsg A#3 Lonestar Lapis Luster sand will be <br /> poured down the annulus between the well casing and the inner wall of the hollow stem <br /> auger The filter pack will be placed adjacent to the screen (0 020 inch screen size) from the <br />' bottom of the baring to a point approximately 2 feet above the top of the screen A five foot <br /> interval of bentonite will be placed above the filter pack and will serve as an annular seal <br /> Portland Type II cement will be utilized to grout from the annular seal to surface grade <br />' 42 <br /> INSTALLATION OF VAPOR EXTRACTION SYSTEM <br />' 1 Two-inch diameter blank PVC piping (schedule 40) will be installed horizontally from the <br /> SVE well head locations to a vapor dropout drum and routed to the thermal oxidizer The <br />' PVC piping will be installed approximately one-foot beneath the ground surface within a one- <br /> foot wide trenching system <br /> 2 One-inch diameter blank PVC piping (schedule 40) will be installed horizontally from the <br /> sparging points to an air compressorlblower unit The PVC piping will be installed <br /> approximately one-foot beneath the ground surface within a one-foot wide trenching system <br /> 43 PROGRESS/CONFIRMATION SOIL SAMPLING <br />' The following procedures will be performed for the collection of soil samples <br /> I 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 Pi otection 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 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 approximately three soil borings to a total depth of approximately 50 feet bsg <br /> utilizing a van-mounted Geoprobe equipped with 1 125-inch probe rods <br /> 5 Decontaminate all sampling equipment in an alconox solution and rinse twice with water prior <br /> to each sampling run Stearn-clean auger flights before advancement of each boring <br /> 6 Soil samples will be collected at five-foot intervals beginning at 10 feet below site grade (bsg) <br /> using a Geoprobe soil assembly and associated 1 125-inch diameter brass sleeves The middle <br /> brass sleeve will be removed and the ends covered with Teflon tape or aluminum sheets, <br />