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K <br /> Mr. Joel Weiss <br /> November 9, 1995 <br /> Page 2 <br /> Floor samples were composited from five locations evenly spaced over the individual floor <br /> areas. A single confirmation sample for soluble lead was composited from each excavation <br /> area. The soluble lead samples were composited from one location along each sidewall and <br /> one location from the floor of each excavation. All soil confirmation samples were <br /> transported under chain-of-custody protocol to a state certified laboratory (Quanterra <br /> Environmental Services in West Sacramento, California) for analysis. <br /> Analytical results for soil confirmation samples from excavation areas A, B, C, and D are <br /> listed in the attached table. Total lead concentration in two or more of the confirmation <br /> samples from excavation areas A, B, and C exceed the established cleanup level of <br /> 220 mg/kg. Reported concentrations of total lead range from 147 mg/kg to 608 mg/kg. <br /> Confirmation sample results for total lead from excavation area D were all less than <br /> 220 mg/kg. The reported concentration of soluble lead in the confirmation sample from <br /> excavation area A is 0.045 mg/L. Soluble lead was not detected (<0.005 mg/L) in the <br /> confirmation samples from excavation areas B, C, and D. <br /> Although confirmation results indicate that excavation should be continued at areas A, B, <br /> and C, additional excavation is not feasible in these areas due to the proximity to 6th Street <br /> and the railroad tracks and the existence of underlying utilities. The identified utilities <br /> include a fiber optic cable and a high pressure natural gas transmission line. In addition to <br /> the physical limitations to further excavation, it is noted that the narrow strip of land <br /> containing excavation areas A, B, C, and D will remain the property of SPTCo and will not <br /> be a portion of the sale parcel and thus not subject to residential development; the use of this <br /> land will remain industrial. All of these factors. combined with the fact that no confirmation <br /> sample results greatly exceeded the agreed upon soil cleanup levels, support the position of <br /> SPTCo that additional soil excavation from areas A, B, C, and D is not necessary. <br /> It is our understanding that you will relay this request to terminate soil excavation in areas <br /> A, B, C and D to Mr. Eric Garcia of the DTSC and seek his concurrence. SPTCo/IC would <br /> appreciate a written response to this request by November 17, 1995 in order to be able to <br /> incorporate backfilling of these areas into the current phase of site work and thus avoid a <br /> need for separate mobilization of equipment. <br /> 469-015.Itr/11-09-95/u/kwrigh/keydata/oldtracy/letters <br />