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r <br /> LEEPSHI- LL-HERKENHOFF'INC. <br /> rocarbon sail residuals <br /> Therefore, to determine whether or not petroleum hyd <br /> exist at this site, LH proposes boring TB-7, to be located directly within <br /> n Fie 1. This <br /> the former tank excavation shown with dashed linetchqes1 to a depth <br /> boring will be drilled using hollow-stem augeringentiu <br /> of 40 feet, will have California modified split-spoon samples collected <br /> at five-foot intervals or at formation changes, and the cuttings will be <br /> logged continuously to provide geologic information. The other two borings <br /> (TB-6 and TB-8) will be located to the south and the northeast of T&-7 to <br /> n. These borings are <br /> determine the horizontal extent of contaminatio <br /> located around the perimeter of thenformer trilled <br /> -spoonite and sampleswill alsobcollected <br /> to a total depth of 30 feet each a p P <br /> at five-Foot internals or formation changes. <br /> An additional area of concern is the southern end of the site where two <br /> y located. Balbi and Chang investigated the area <br /> small tanks were formerl <br /> -3. The locations of these borings are <br /> with two soil borings, TB-2 and TB <br /> illustrated in Figure 1. Soil boring TB-2 was not sampled; however, the <br /> geologic lag shows no observation of gasoline odor. TB-3, which is located <br /> directly Within the former tank location, shows non-detect samples at 2, <br /> 15 and 20 feet. Water samples collected by LH from the nearby monitoring <br /> zene and xylene; however, the drilling <br /> well MW-3 showed trace amounts of ben <br /> log compiled by Balbi and Chang shows no indication of soil contamination <br /> at 50 feet was 4 and the soil samples collected frofom e etroleum co boring <br /> tam na is in MW-3dtern <br /> to be non-detect. The trace amountsp <br /> -site source and, therefore <br /> be attributable to an off , LH does not propose <br /> any further sail investigation in this area. <br /> The fourth proposed boring, TB-5, wi11 be located near Balbi & Chapg's 64 <br /> and MW-1 (see Figure 1}. The existing boring .B-4 showed no dete�:table <br /> contaminants in the soil samples collected and analyzed from depths of 5, ' <br /> 10, 15, and 20 feet, but the 9-4 drilling log did note a gasoline odor at <br /> 26 feet. The nearby monitoring wodor at a depth <br /> ell shows trace amounts of gasoline <br /> contamination in the groundwater as <br /> well <br /> Cesamountsnin the soilasample from <br /> of 26 and 31 feet on the MW-1 log and tea <br /> 25 feet. LH's proposed boring will be 40 feet deep located adjacent to <br /> MW-1 and B-4. Split-spoon samate theples ill be <br /> resenceco <br /> ected <br /> intervals. rlabsenceaaf petroleum <br /> This boring will valid A <br /> product contamination in this area. <br /> All drilling will be conducted dry with no fluids added to the borehole <br /> rilling equipment. A sampler attached to drilling <br /> or Fabrication to the d <br /> 5 <br />