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iSunland Gasoline . March 10,2004 <br /> 2085 Fremont Street,Stockton, California Page 4 <br /> Work Plan for the Lateral and Vertical Extent <br /> Ile Of Soil and Groundwater Contamination- Continued <br /> IQuarterly Groundwater Monitorin : Groundwater samples will be collected from <br /> each monitoring well on a quarterly basis for one (1) year. This data will be used to <br /> Idetermine the levels of contamination present in the groundwater and to track the <br /> change in contamination over time. Based on this information, a determination of the <br /> most efficient and economical method of remediation can be proposed. <br />' 3.1 Drilling <br /> Permits will be obtained, as necessary, for the borings before drilling begins. The <br />' borings for the monitoring wells and four (4) of the soil borings will be <br /> accomplished using a mobile mounted drilling rig employing the use of a hollow <br /> stein flight auger no less than 3 1/4-inch i.d. and 8 718 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 <br /> soil or bedrock characteristics, and any evidence of contamination will be noted. <br /> All water-bearing zones and the depths at which they were encountered will be <br /> noted 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 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 (Y) 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 /> 1 <br /> I <br />