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Closure Report� May 21, 1993 Southland Site No 20680, 9110 Thornton Road, Stockton, CA 7 The water generated during steam cleaningwas stored in 55 lion drums labeled with t 55-gallon abe ed he borehole ' number After reviewing analytical results of samples collected from the soil borings, Larry Williams, Senior Environmental Control Officer of the Municipal Utilities Department of Environmental Control, City of Stockton authorized disposing of the water through the sanitary sewer located in the ' treatment compound ' 3.3 Soil Sampling Sod samples were typically collected from bonngs A through G, 1, and J at approximately 5-foot ' intervals to the bottoms of the barings However, sad samples were collected starting at 2 feet ' below grade in Sod Borings A, D. E, and 1, and at 5 feet below grade in Sod Bonngs B, C, F. G, and H because the representation of the vertical soil profile was more complete by staggering the sad sample collection points The samples were collected using a 2-inch-outside-diameter split-spoon ' sampler lined with three 2-inch-diameter by 6-inch-long brass sample tubes At each sample point, the sampler was advanced 18 inches ahead of the augers into undisturbed soil Soil samples were field screened for volatile hydrocarbons using a photo-ionization detector (PID) One soil sample collected at every 5-foot interval was sealed with aluminum foil, capped, taped, labeled, placed on ' ice in an insulated container, and delivered to a California-certfied laboratory Four composite sod samples were collected for disposal classification (SP-1, SP-2, and SP-3 were collected from January 12 through 14, 1993, and SPA was collected on February 18, 1993) Sod sampling was performed according to Groundwater Technology Standard Operating Procedures (Appendix E) Fourteen soil samples (3 composite sod samples from the drill cuttings and 11 samples from the sod borings) Iwere selected for analyses IFourteen soil samples were analyzed for BTEX and TPH-G concentrations using Environmental Protection Agency (EPA) Methods 5030/8020 and modified EPA Method 8015 Eleven sal samples were analyzed for 1,2-dibromoethane using EPA Method 504, and ten soil samples were analyzed for total lead using EPA Method 7421 IBecause of the number of soil samples collected, the procedures for selecting sod samples for analyses was based on PID readings (parts per million by volume [ppmv]) If four or more sad Isamples from one boring had PID readings over 10 ppmv, the soil sample with the highest PID reading was analyzed for TPH-G and BTEX If the PID reading for this sample was over 10 ppm, 1211RO13 _ GROUNDWA'T'ER _' ��TECHNOLOGY, INC