SR0082695 - Laserfiche WebLink

Home Browse Search

Site Investigation Work Plan Carousel Cleaners, Sacramento, California Sampling and Analysis • For each SG sample location, a laboratory-supplied flow controller will be connected to a laboratory-supplied 1-liter canister. The flow controllers will be set for an air flow rate between 100 and 200 milliliters per minute. The canisters will be evacuated by the laboratory to more than 25 inches of mercury gauge pressure,before sampling. • The valve on the canister will be opened to begin sample collection. The initial vacuum pressure indicated by the canister pressure gauge will be recorded on the chain-of-custody form. • After approximately 4 to 9 minutes,when the vacuum gauge pressure is between 1 and 10 inches of mercury,the valve on the canister will be closed to end sample collection. The final vacuum pressure indicated by the canister pressure gauge will be recorded on the chain-of-custody form. • Duplicate soil gas samples will be collected at a rate of 10 percent. • All wells will be surveyed by a California-certified surveyor. 4.4.3 Laboratory Analysis SG samples will be analyzed for VOCs by USEPA Method TO-15, as shown in Table 2. 4.5 Permits Before mobilization, all necessary permits will be obtained from San Joaquin County before the start of field work. 4.6 Utility Clearance Before advancement of any tooling or subsurface work,Underground Service Alert(USA)will be called at least 48 hours in advance.After all utility members have responded and/or marked their utilities at the project site,URS will have a private utility locator conduct utility clearance at each intrusive location. During this utility clearance, a 10-foot by 10-foot area surrounding each intrusive location will be cleared. In addition, each location will be hand-augered to a depth of 5 feet bgs. 4.7 Decontamination Procedures All workers will wash their hands thoroughly with soap and water before eating and when exiting the work zone. They will clean-up the project site and all site equipment, and then will wash their hands and faces thoroughly when work activities are completed. Site personnel may become contaminated during the course of field activities by: • contacting airborne vapors,gases,mists, or particulates; • coming in contact with splashed materials or walking through puddles; • handling contaminated soils and equipment; • sitting or kneeling on contaminated soils or liquids; and/or • using contaminated instruments or equipment. 4-4