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•.. N../ <br /> City of Stockton, Fire Station No. 12 A68105.01 <br /> August 7, 1995 Page 5 <br /> soil boring B-2 were selected for laboratory analysis. In soil borings B-3 and B-4, samples <br /> collected at 10, 20, and 30 feet BSG were selected for laboratory analysis. <br /> After completion of the soil sampling, the soil borings were backfilled with a sand/cement <br /> slurry. The slurry was pumped through the annulus in the hollow-stem augers. Backfill was <br /> placed in one continuous operation from the bottom to the top of the borehole. When the <br /> annulus filled with the slurry, auger flights were removed (no more than 15 feet at a time) <br /> from the borehole, allowing the slurry to uniformly fill the borehole to the surface. <br /> •� Soil cuttings and decontamination rinsate generated during drilling were stored on site <br /> within the fenced parking area in Department of Transportation-approved, sealed,55-gallon <br /> drums. Disposal of this material is addressed in Section 8.0 Recommendations. Final <br /> �- disposal/treatment of these materials is the responsibility of the client. <br /> 4.2 Laboratory Testing Program: Benzene, toluene, ethylbenzene, and Xylenes (BTEX) <br /> and total petroleum hydrocarbons for both gasoline and diesel ranges (TPH-G and TPH-D) <br /> were used in the laboratory testing program as indicator parameters. Preparation and <br /> analytical methods for the laboratory analyses are summarized in Table 2. <br /> .. <br /> cAsts:z .::... <br /> .. .;. <br /> PREPARATION:AND ANAGYTICAI MEIIIODS <br /> ... ................. ............ ..I...... _....... . :.:.. .. <br /> Detection limit for <br /> Type of Analysis Preparation Method Analytical Method Reporting Purposes <br /> mg/kg <br /> V <br /> Benzene,Toluene,Ethylbenzene,and 50301 80201 0.005 <br /> Xylenes <br /> Total Petroleum Hydrocarbons- 5030 GC/FID2 1.0 <br /> r Gasoline Range <br /> Total Petroleum Hydrocarbons-Diesel 35401 GC/FID2 2 <br /> Range <br /> r <br /> GC/FID = Gas Chromatography/Flame Ionization Detection <br /> r <br /> 1 United States Environmental Protection Agency,1983 <br /> 2 California State of,Leaking Underground Fuel Tank Task Force,October 1989 <br /> Twining is a California Department of Health Services certified hazardous waste laboratory <br /> (Certificate No. 1371) for the analyses outlined herein. A description of laboratory quality <br /> assurance/quality control procedures used in this assessment are described in the SOPS <br /> presented in Appendix A. <br /> .r <br />