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February 13, 1988 AGS Job No. 2005-P Delta Truck Sales, Stockton, California o The excavation must be isolated from rain water until cleanup is completed, particularly if excavation is completed during the wet season. 0 A sampling plan must be submitted which addresses the number of planned samples, sample collection and preservation methods, and holding times. Plans for duplicate samples, sample splits, and trip blanks should be delineated. o Background uncontaminated concentrations should be established as a base from which samples containing naturally occurring compound concentrations can be distinguished from contaminated samples. o Analyses should include total petroleum hydrocarbons using a fused capillary column-equipped gas chromatograph and flame ionization detector. All compounds detected in method 8240 should be reported, including chlorinated hydrocarbons, benzene, toluene, ethylbenzene, and xylenes. Concentration of metals should be evaluated using Waste Extraction Test (WET) procedures if and only if the total concentration of the metal of concern is less than its Total Threshold Limit Concentration (TTLC) and more than 10 times the STLC. The chosen methods of analysis should be identified. Major ions should be analyzed in all samples. Disposal in other than a Class I waste facility may require evaluation using the WET procedures. Ground-water samples should be analyzed for the same constituents as the waste. o Soil samples must be collected from the base and side walls of the excavation to verify cleanup. o A ground-water monitoring well must be installed within the areal limits of the excavation. Each soil zone should be sampled and chemically characterized. Plans for well construction,• development, and sampling should be delineated. o A time schedule for the operations should be specified. 3