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with laboratory claned brass tubes. Augers and drill bits will be steam cleaned with potable water between borings. Once the split-spoon has been driven into the ground and re- trieved, the spoon will be opened and two of the tubes will be remov<�d. The ends of each tube will be covered with teflon sheeting and then capped with plastic end caps which will in turn be sealed to the tube by wrapping with an elastic tape such as electrical tape. The tubes will then be labeled, inserted into ziplock baggies and placed on ice in an insulated cooler for delivery to the laboratory within 24 hours of collection. soil from tubes not submitted for chemical analysis will be used to provide lithologic information. In addition to these Boil samples, one duplicate soil sample will be collected for quality assurance at the time the monitor well boreholes are drilled. The duplicate sample will be coded so as to be indistinguishable to the laboratory from the other samples and will. be taken from the brass tube adjacent to that of the primary sample. This procedure will serve as a check on consis- tency of laboratory methods. However, some variation of the analytical results should be expected due to the non-homogenous nature of soils. Al: soil samples submitted for chemical analysis will be labeled in the field with an indelible ink pen as they are collected. For each sample, the date and time of sample collection, the sampler's initials, the project name and the designated analyses will be recorded on the label and in the field log book. soil samples will be identified by a well number-depth combination, for example, a soil sample numbered MW?--5 would indicate a soil sample collected at monitor well Mw-1 from 5 feet BGS. It may be necessary to augment these soil samples with samples collected from soil borings placed closer to the excavated tank area. These borings, if requjrecc, would be sited from informa- tion obtained from earlier borings as well as the chemical, lithologic and hydrologic information acquired through implemen- tation of this work plan. Specific recommendations regarding additional boring; will be addressed in the report submitted fallowing completion of the current scope of work. 3.1 Soil Sample Analytical Protocol The soil samples submitted f,-r chemical analysis will be trans- ported under chain--of-custody to the WESTON Analytics' Stockton, CA. laboratory. The analytical suite will include benzene, toluene, xylene and ethylbenzene by EPA Method 8020 (aromatic volatile organics) and total petroleum hydrocarbons by. Method 8015. WESTON Analytics' Stockton Laboratory is a state certified laboratory. 3 -