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Vapor Intrusion Assessment Work Plan Project number:60653972 • For each soil gas sample location, samples will be collected in laboratory supplied, individually certified 1-liter SUlVIlVIA canisters.New tubing will be utilized at each sampling point to avoid cross- contamination. • Duplicate soil gas samples will be collected at a rate of at least 1 per sample event or 10 percent, whichever is greater. • The SUMMA canister will be shipped to a qualified environmental laboratory for analysis of project- specific VOCs using USEPA Method TO-15. 4.5.2 Borehole Abandonment Upon completion of vapor intrusion investigation, each borehole will be properly abandoned by backfilling with soils cuttings and the surface will be restored to as close to pre-construction conditions as reasonable. 4.5.3 Laboratory Analysis Samples will be analyzed for helium and VOCs by ASTM Modified Method D-1946 and USEPA Methods TO-15 in accordance with Table 2. 4.6 Decontamination Procedures Workers will wash their hands thoroughly with soap and water before eating and when exiting the work zone. They will clean-up the site and equipment and then thoroughly wash their hands and faces when work activities are completed. Site personnel may become contaminated during the course of field activities.Following are possible avenues: • Contacting airborne vapors,gases,mists,or particulates; • Contacting splashed materials or walking through puddles; • Handling contaminated soils and equipment, • Sitting or kneeling on contaminated soils or liquids; and • Using contaminated instruments or equipment. Although PPE and good work practices protect field personnel from direct contact and reduce the contamination of PPE, instruments,and equipment, contamination cannot be avoided completely. Contaminants can be transferred to clean areas and offsite,potentially exposing unprotected field personnel and the public.To prevent such occurrences,general and site-specific safety rules,training, and decontamination procedures will be implemented at the Site. General cleaning requirements for field instruments(tapes,meters, etc.)include, at a minimum,wiping down equipment body,probes and cables with detergent solution and rinsing thoroughly with tap water. Reusable equipment will be decontaminated either by steam cleaning or by washing, or by a series of washings,using an industrial detergent and water solution, followed by a series of rinsing using generous amounts of water.To avoid cross-contaminating reusable sampling equipment, it may be necessary to employ a decontamination solution rinse followed by a series of potable water rinses and a final de- ionized water rinse.The rinse water will be collected in clean containers for appropriate disposal. Prepared for: California Regional Water Quality Control Board,Central Valley Region AECOM