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Sunland Gasoline May 28,2000 <br /> 2085 Fremont Street,Stockton, California Page 4 <br /> Work Plan for the Lateral and Vertical Extent <br /> of Soil and Groundwater Contamination <br /> stem flight auger no less than 3 114-inch i.d. and 8 7/8 o.d. The deep vertical <br /> boring in the vicinity of B-1 will be completed using the cone penetrometry <br /> method. <br /> All drilling equipment will be thoroughly steam cleaned before drilling begins, to <br /> prevent the introduction of contamination from off site, and between borings to <br /> prevent cross contamination. <br /> The borings will logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System (Appendix A). The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil <br /> or bedrock characteristics, and any evidence of contamination will be noted. All <br /> water-bearing zones and the depths at which they were encountered will be noted <br /> on these logs (Appendix B). <br /> All borings will be drilled in such a manner as to prevent cross contamination <br /> between strata. The borings will then be terminated with a cement and three <br /> percent(3%)Bentonite mixture. <br /> 3.2 Soil Sampling <br /> All soil sampling equipment will be thoroughly steam cleaned before and between <br /> sampling to prevent cross contamination. Relatively undisturbed soil samples will <br /> be taken at intervals of not more than five feet (5') in order to evaluate the <br /> subsurface materials. <br /> The soil samples will be taken using a California Modified Split Spoon sampler <br /> with brass liners. The sampler will be driven continuously by a wire line hammer. <br /> The laboratory samples will not have head space and will be immediately sealed in <br /> their liners using Teflon® lined plastic caps. The remaining sample will be <br /> removed from its liner to be used as an aide to the on-site professional in logging <br /> the material at that depth. <br /> Soil samples collected for analysis will be analyzed using EPA method 8015 for <br /> gasoline petroleum hydrocarbons, EPA method 8020 for BTEX compounds, and <br /> EPA method 8260B for oxygenates (MTBE, 1,2 DCA., EDB, Ethanol, Methanol, <br /> TAME, TBA, ETBE, DIPE). Analyses are to be conducted by GeoAnalytical <br /> Laboratories, Inc. a State certified laboratory. All samples will be recorded on a <br /> Chain of Custody and placed in an ice Chest with Blue Ice® for transport to the <br /> lab. <br /> k <br />