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APR 08 '94 08: 17 S7 18 ;: r.�{T� ." '-P.Z t; <br /> t <br /> RIEDEL ENVIRONMENTAL <br /> 4 <br /> � SERVICES INC <br /> 3,0 EXCAVATION OF SOIIS AND REMOVAL OF TANKS <br /> 3.1 Excavation, Transportation, and Disposal of BackPl] Material <br /> On 8 November 1993 RES <br /> personnel arrived on site to supervise the excavation and loading <br /> of the tank pit backfill material that had been profiled for disposal at the Forward Inc. landfill <br /> located at 9999 South Austin Road, in Manteca, California. A total of approximately 320 cubic <br /> yards of backfill soil was transported on 8 and 9 November 1993 in 16 truckloads by Valley <br /> Material Transportation of Lodi, California Copies of the Non-Hazardous Waste Manifest for <br /> the transportation and disposal of the backfill soils are provided in appendix A. <br /> 3.2 Removal of Tbree 25,000-Gallon Diesel USTs <br /> On 10 November 1993, RES personnel supervised the removal of three (3) 25,000-gallon, <br /> single-walled steel, diesel USTs from the subject site and obtained a total of nine (9) samples <br /> from the native soils below the tanks. The tank removal and sampling activities were witnessed <br /> by Ms L T. Briggs, Senior Registered Environmental Health Speciajist (RENS) of the Public <br /> Health Services of San Joaquin County <br /> Prior to removal, each tank was lnerted with 850 pounds of dry ice by Aronson Engineering <br /> (Aronson) personnel, the Pacific Bell tank contractor. RES personnel tested the tank atmosphere <br /> and verified the percent of the Iower explosive limits (LEL)_) and oxygen content by utilizing a <br /> Gastek 1314 LEL/02 meter Once fully inerted, the USTs were removed from the excavation <br /> by Aronson Engineering. No leaks or holes were detected dunn visual inspection of the <br /> exterior of the tanks. The tanks were loaded onto flatbed trailers and transport by Erickson <br /> Inc. to their tank disposal/recycling facility in Richmond, California A copy of the Uniform <br /> Hazardous Waste Manifest for the transportation and disposal of the tanks are included in <br /> Appendix A. The certificates of destruction for each tank are also provided. <br /> 4.0 P4TTAL CONFIRMATORY SOIL SAMPLING AND ANALYSIS <br /> 4.1 Soil Sampling <br /> Upon removal of the tanks on 10 November 1993, confirmatory samples of the native soils were <br /> retrieved at three locations under each tan ata depth of fift eet below grade, where <br /> concrete tie-downs/saddles were encountered. The nine soil samples were obtained from the <br /> excavation floor utilizing a manually operated slide hammer sampling device The soil samples, <br /> which were obtained within brass tubes and capped with teflon film and plastic end caps, were <br /> relinquished to Argon for on-site analysis The confirmatory sample locations were determined <br /> by Ms. L.T. Bnggs. The confirmatory rank excavation sample locations and the stockpile <br /> composites are shown on Figure 3. <br /> 035 9315\XM?8-STOIW RM21MAR94 <br />