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1 <br /> l i <br /> SIERRA <br /> Clint Rogers Page 3 <br /> March 25, 1991 <br /> borings and install 3 monitoring wells in them at the site.; The locations of the proposed soil <br /> borings/monitoring wells are shown on Figure 2 (Appendix A). The following outlines the proposed <br /> scope of work and procedures for this investigation. <br /> 1. Prepare a site safety plan specific to this investigation based on past and present site use. <br /> 2. Conduct an area business survey to identify other potential sources of hydrocarbons near <br /> the site. <br /> 3. Drill 3 soil borings at the site. The soil samples from the borings will be surveyed in the <br /> field with an organic vapor meter.(OVM1 to determine whether volatile hydrocarbons are <br /> present in the samples. OVM readings and field observations will be used to select soil <br /> samples from the monitoring well borings for analyses. The soil samples will be analyzed <br /> for total purgeable petroleum hydrocarbons TPPH (G),total petroleum hydrocarbons(TPH) <br /> as diesel (D), benzene, toluene, ethylbenzene,and xylenes(BTEX)-, and total lead (Pb): Soil <br /> cuttings will also be analyzed for organic lead for disposal purposes, <br /> 4. Install three 2-inch diameter monitoring wells in the borings. <br /> 5. Develop and sample the wells. Analyze water samples from the wells for TPPH (G),TPH(D),, <br /> i BTEX and.organic lead. n <br /> F,. Survey the top of casing elevations of the wells and measure depth to water and product <br /> thickness (if product is present). The survey and water level data will be used to determine <br /> the ground water flow direction and gradient beneath the site. <br /> 7. Arrange for disposal of the drill cuttings from the borings,the steam-cleaning rinseate and <br /> the monitoring well purge water. <br />�' 8. Report the results and make recommendations for additional work, if needed. <br />