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SIERRA <br /> SEP 24 '931 M M., // !� <br /> Environmental Services <br /> September 15, 1993 <br /> Brett Hunter <br /> Chevron USA <br /> P O Box 5004 <br /> San Ramon, CA 94583 <br /> Re Monitoring Well Installation <br /> Chevron SS #9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> SES Project #1-146-02 <br /> Dear Mr Hunter <br /> This report presents the results of the monitoring well installation completed by Sierra <br /> Environmental Services (SES) at the above-referenced site (Figure 1, Appendix A) <br />. SUBSURFACE INVESTIGATION <br /> On August 18, 1993, Soils Exploration Services of Vacaville, California (C-57 3582696) <br /> installed one ground water monitoring well (MW-7) using a CME-55 hollow-stem auger dnll rig <br /> The monitoring well location is shown on Figure 2(Appendix A) The monitoring well was installed <br /> to further evaluate the extent of petroleum hydrocarbons in ground water and to verify the ground <br /> water flow direction <br /> Soil Boring <br /> Soil samples were collected, screened using an organic vapor meter (OVM), and logged in <br /> accordance with SES Standard Operating Procedures for Soil Sampling, OVM Readings, and <br /> Logging Method, respectively (Appendix C) <br /> Soils encountered during drilling generally consisted of low-permeability clay and silt and <br /> low-to moderate permeability silty sand <br /> P.O. Box 2546 e Martinez, California 94553 (510) 370 - 1280 <br />