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Quality Assurance/Quality Control Plan Page 10 Soil samples will be collected at five foot intervals, at significant changes in lithology and intervals of obvious contamination in order to develop a complete profile of soil contamination. 11.2 SAMPLE COLLECTION DURING TANK REMOVAL Soil samples will be collected as soon as possible after removal of the tank. Where feasible, all preparations for soil sampling will be made prior to tank removal. Soil samples collected from a backhoe bucket or directly from the excavation floor will be collected in a thin-walled stainless steel or brass cylinder at least three inches long by one inch in diameter. From 3 to 24 inches of soil will be removed from the immediate surface area where the sample is to be taken and the cylinder then pounded into the soil with a wooden mallet, bulk density driver, or other decontaminated driving device. No head space will be present in the cylinder once the sample is collected. Care will be taken to avoid contamination of both the inside and outside of the cylinder as well as its contents. During sampling, latex gloves will be worn to prevent cross contamination with other samples. One pair of disposable gloves will be dedicated to each sample collected. One the sample is collected, each end of the cylinder will be sealed with aluminum foil or teflon tape and then capped with a polyethylene lid, taped, and labeled. The sample will then be individually sealed in a ziplock bag and immediately placed in an ice chest containing dry ice or frozen chemical ice for delivery to a state certified laboratory. Sample identification, storage and transportation will be conducted as outlined in the previous section. 11.3 SAMPLING FROM SOIL PILES OR SHALLOW SOIL PITS Soil samples will be collected and transported from excavated material in the manner described in the previous section, however, a backhoe will not be utilized. If composite samples are collected, four brass cylinders will be collected for every 50 cubic yards of material to be sampled unless otherwise specified by the lead regulatory agency. The samples will be composited by the state certified analytical laboratory personnel prior to testing.