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iv�l <br /> V k„ Mn" <br /> M. <br /> .. Y.. ', .. <br /> .✓ 4F kJt tY U ^i <br /> 8720033A-COT-6 <br /> Water Sam lin Procedure <br /> - Water samples were collected from all the monitoring wells on September 14, <br /> 1987. Our field observations are summarized on Table 1. The wells were <br /> _ sampled with a clear glass bailer, and the sample was visually inspected <br /> for product layer and sheen. No product layer or sheen was observed on any <br /> samples. The wells were then developed with the drill rig's air compressor <br /> and allowed to recharge at least 24 hours after development. Prior to <br /> sampling, water level measurements were obtained, the wells were then <br /> pumped of approximately four submerged casing volumes. Groundwater samples <br /> were collected with a Teflon bailer. The samples immediately placed in 40- <br /> milliliter capacity VOA vials, sealed and stored in a refrigerated <br /> container for transport to the analytical laboratory. The water samples <br /> r were then delivered to WCC's environmental laboratory along with a Chain- <br /> Of-Custody form, a copy of which is attached. Portions of the water <br /> w_ samples were submitted under Chain of Custody control to California <br /> Analytical Laboratory by the WCC laboratory for organic lead analyses. <br /> -" 5.0 ANALYTICAL RESULTS <br /> Soil samples from the borings were analyzed for benzene, toluene, <br /> ethylbenzene, total xylenes, chlorobenzene, ethylene dibromide, total <br /> petroleum hydrocarbons and total organic lead. Groundwater samples were <br /> analyzed for benzene, toluene, ethyl-benzene, xylenes, total petroleum <br /> hydrocarbons and total organic lead. Table 2 presents the analytical <br /> results for soil samples; Table 3 contains the analytical results for <br /> water. <br /> As shown on Table 2, concentrations of benzene, toluene, ethylbenzene, and <br /> total xylenes exceeding the threshold of detection (generally 0,2 mg/kg) <br /> were identified by the analytical laboratory in most soil samples from <br /> borings S-1 through S-4. Samples from boring S-4 generally showed no <br /> detection or low levels of these parameters, while samples from boring S-3 <br />