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Mr. Joel Weiss <br /> August 25, 1994 <br /> Page 3 <br /> Confirmation samples will be collected from the excavated areas <br /> at a rate of one discrete sample for every 2,500 feet2 (50'x 50') <br /> of exposed soil surface. Soil lead concentration averages will <br /> then be calculated for three adjacent samples, resulting in a <br /> calculated mean lead concentration representative of soils from <br /> areas of approximately 7,500 feet2. Confirmation sample means <br /> exceeding 500 mg/kg will require additional soil excavation. <br /> Excavated soils will be temporarily stockpiled on the adjacent <br /> SPTCo property, west of the subject site, pending final <br /> arrangements for offsite disposal. SPTCo intends to transport <br /> excavated soil by rail car to an approved non-RCRA hazardous <br /> waste landfill in Utah. <br /> Item 3 A minimum detection limit of 15 micrograms per liter (µg/L) <br /> for soluble lead will be used, provided the laboratory can reach <br /> this level. <br /> Item 4 Figure 3 of the workplan has been revised to show the location <br /> for the new monitoring well MW-3. <br /> In regards to sampling of existing monitoring wells (MW-1 and MW-2) located on site, and <br /> addressed in the July 27, 1994 meeting: <br /> IC, on behalf of SPTCo, anticipates sampling these wells within 3 weeks of the date of this <br /> letter, and analyzed for the following: Volatile organic compounds (VOCs) by EPA Methods <br /> 601 and 602, total petroleum hydrocarbons (TPI by EPA Method 8015 Modified; 17 CAM <br /> metals (dissolved) by EPA 6010/7000 series; semi-volatile organic compounds by EPA <br /> Method 8270; and general minerals. <br /> Upon final approval of this workplan addendum by the Regional Board, IC will initiate <br /> workplan implementation within 2 weeks of approval. <br /> tracy274.1[r/08-25-94/u/cwilWtracy/letters <br />