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w , 17 March 1997 S AGE-NC Project No. 95-0144 Page 6 of 7 photo-ionization detector (PID) to ensure optimal destruction of recovered hydrocarbon vapors; soil vacuum measurements; document all findings and observation in a field log. Monitor the SVE system weekly using (PID) and manhelic gauges to monitor the cleanup progress after the initial two weeks. 4. Air samples will be collected on a monthly basis. The samples will be collected in Tedlar bags and transported to a state certified laboratory for analysis of total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X) and methyl-tertiary butyl ether(MTBE), in accordance with EPA approved methods. The analytical results will assist in correlating PID readings and determining when to advance confirmation soil borings. 5.2. CONFIRMATION SOIL PROBE BORINGS For the advancement of confirmation soil probe borings,the following procedures will be performed: 1. Prepare a Site Health and Safety Plan in accordance with the Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for Occupational Safety and Health, Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, October 1985. 2. Notify the San Joaquin County Environmental Public Health Services - Environinental Health Division(PHS-EHD)48 hours prior to commencement of any work, while securing proper city/county boring permits. 3. Boring locations will be marked at least 48 hours in advance for an Underground Service. Alert (USA) check of underground utilities or pipes. 4. Advance approximately a soil probe boring.to a maximum depth of 35 feet bsg utilizing a van-mounted Geoprobe equipped with 1.125-inch probe rods. 5. Decontaminate all sampling equipment in an alconox solution and rinse twice with water prior to each sampling run. 6. Soil samples will be collected at five-foot intervals beginning at 5 feet below site grade(bsg) using a Geoprobe soil assembly.and associated 1.125-inch diameter brass sleeves. The middle,brass sleeve will-be.removed,and-the ends 2 covered with Teflon tape or.-aluminum sheets, sealed with plastic end caps, secured with tape, and-immediately placed in a chilled container. Each sample sleeve will be labeled with the following: boring location, depth, time, date, sampler initials, and transported to a state certified laboratory for analysis of . TPH-g, BTE&X-and MTBE.