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Ms. Vera Fischer, P.G., RWQCB April 24, 2017 Work Plan for Additional Site Assessment Project No. 2154-1817-01 1817 South Fresno Avenue, Stockton, CA Page 7 A minimum of 24 hours after the groundwater monitoring wells are developed, the monitoring wells will be purged and groundwater samples will be collected. The samples will be collected using a disposable bailer, transferred to laboratory-supplied glass vials, and placed in an ice-chilled cooler. The groundwater samples will be transported under strict chain-of-custody protocol to a California-certified analytical laboratory for analysis. The newly installed groundwater monitoring wells will be incorporated into the existing groundwater monitoring program. Soil Gas Probe Well Installation A licensed driller will install the soil gas probes within a borehole advanced to approximately five feet bgs using hand tools. Upon reaching the base of the borehole, a polyethylene soil vapor implant (Environmental Service Products Part No. SVPT-91, or similar) attached to 0.25-inch diameter Teflon tubing, or similar, will be installed near the base of the borehole. A filter pack of graded sand will be placed around the soil vapor implant, and granular bentonite will be placed on top of the filter pack sand and used to backfill the borehole up to surface grade. A protective cover will then be installed over the top of each soil gas probe. Soil Gas Sampling Stratus will return to the Site during the summer or fall 2017 (during dry weather conditions) to collect samples from SG-1 through SG-3. Prior to sampling, the approximate air volume situated inside of the Teflon tubing and the filter pack sand surrounding each soil vapor implant will be calculated. Stratus will use expendable Summa Canister(s) to purge this ambient air. Following purging of the ambient air, a separate Summa Canister will be used to collect each soil gas sample. During filling of the canisters, the flowrate will be regulated to fill at a rate between 100 and 200 milliliters per minute (ml/min). A tracer gas leak check using iso-propyl alcohol will be performed in order to assess potential leakage during sampling. Once the samples are collected, the Summa Canisters will be stored at ambient air temperature before delivery to the laboratory for chemical analysis. Waste Management Drill cuttings and wastewater generated during the drilling and well development activities will be contained in DOT-approved 55-gallon steel drums. The drums will be appropriately labeled and stored at the Site pending proper disposal. A licensed contractor will transport the soil and wastewater to an appropriate facility for disposal. KABarnes Trucking\Work Plans\bames trucking work plan 2017.doc STRATUS