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' 1e601cal2'echmcs int Page 2 <br /> Site Characterization Report <br /> Valentine(Castle Motors) <br />' Project No 7212 <br /> October 4, 1999 <br />' Soil cuttings and drilling decontamination water were placed in DOT-17 approved 55 gallon <br /> drums and moved to the back of the site until their disposal can be arranged <br />' 2.1.1 Soil Sampling Procedure <br /> Soil samples were collected for geological evaluation continuously starting at 50 feet bgs in <br /> MW-101 Samples were collected continuously in SB-201 starting at 100 feet bgs A boring <br />' log providing sediment description using the USCS and field observations was maintained by <br /> a professional geologist working under the supervision of a registered geologist Soil <br /> samples were collected in 6 0-inch brass liners using a 2 0 inch modified California split <br /> spoon sampler All soil samples were sealed with Teflon sheets, capped with plastic end <br /> caps, labeled, and placed in a cooler at 4' Celsius for transport to the laboratory following <br /> Chain of Custody protocol The OVM was used to screen the soil samples <br />' Attempts were made to use the SimulProbe Maxitool to collect soil and soil-porewater <br /> samples at three intervals in each borehole <br /> MW-101 <br />' • 68 feet <br /> • 90 feet <br /> • 97 feet <br /> SB-201 <br />' • 80 feet <br /> • 95 feet <br /> 0 111 feet <br />'• However due to the geology at the site (clays and loose sands), it was difficult to obtain both <br /> a soil and a soil-porewater sample at each interval Either the soil was clayey enough to stay <br /> in the sampler but not allow water to enter the canister or it was sandy enough to allow for <br />' the collection of a good water sample but the soil sample slid out of the tool Both a soil and <br /> soil-porewater sample were only collected at 68 feet in MW-101 and at 111 feet in SB-201 <br /> Also there is some question as to the relibilty to the analytical values obtained for these <br />' samples This will be discussed in the "Results" section <br /> SimulProbe Operation <br />' The SimulProbe Maxi Tool construction reflects that of a Split Spoon sampler with <br /> modification to allow for its specialized sample collection methods Prior to lowering the <br /> tool into the borehole a rubber sleeve is rolled over the SimulProbe to prevent groundwater <br /> and/or soil from the borehole walls entering the sampler When the sampler is driven the <br />' rubber sleeve tears away allowing soil to enter the sampler Three, six inch long by three <br /> inch diameter stainless steel sleeves contained inside the SimulProbe are filled with the soil <br /> as the tool is driven These sleeves are removed from the tool and one is taken out, the ends <br />' are covered with Teflon sheets and Teflon caps are then placed over the ends This sample is <br /> then placed on ice for shipment to the laboratory The other two sleeves are used for <br /> geologic evaluation <br />' After the SimulProbe sampling tool is advanced into the saturated zone the tool is retracted to <br /> expose the screen The sample collection chamber is allowed to fill under ambient <br /> hydrostatic pressure Once full the chamber is sealed with an pneumatically actuated (N2 <br />' gas) solenoid valve and the apparatus is brought to the surface The sample chamber is <br /> carefully emptied using a bottom-emptying device thus reducing the possibility of sample <br /> agitation and volatilization Once the sample container (40-m1 VOA) was filled and capped, <br />' the bottle was inverted, tapped, and checked for headspace bubbles The sample container <br /> 1 <br />