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GeoStrategies Inc. <br /> WORK PLAN FOR A LIMITED <br /> SUBSURFACE INVESTIGATION <br /> at <br /> Former Unocal Station No 0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Report No 4827 04-1 <br /> INTRODUCTION <br /> This Work Plan for Limited Subsurface Investigation proposes to further evaluate the extent <br /> of hydrocarbon impact to the soil and groundwater beneath the subject site The proposed <br /> • scope of work includes. obtaining the necessary soil boring permits from the San Joaquin <br /> County Environmental Health Department (SJCEHD) and encroachment permits from the <br /> City of Stockton Public Works Department (SPWD), performing a limited Phase I site <br /> assessment, drilling three soil borings to groundwater, installing three onsite and two offsite <br /> groundwater monitoring wells, surveying the newly installed monitoring wells to a vertical <br /> datum; developing and sampling the newly installed monitoring wells, and preparing a <br /> report which presents the findings of the investigation This Work Plan for Limited <br /> Subsurface Investigation was prepared by GeoStrategies (GSI) at the request of Unocal <br /> Corporation (Unocal) in response to a letter from the SJCEHD dated December 23, 1994, <br /> requesting continued on and off site soil and groundwater investigation <br /> The scope of work described in this report is intended to comply with the State of California <br /> Water Resources Control Board's Leaking Underground Fuel Tanks (LUFT) Manual, the <br /> Regional Water Quality Control Board (RWQCB) Tri-Regional Board Staff`' <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites, <br /> and SJCEHD guidelines GSI Field Methods and Procedures are included in Appendix A <br /> The Site Safety Plan for this phase of the investigation in included in Appendix B <br /> 482704-1 <br /> 6747 Sierra Court, Suite G • Dublin, CA 94568• (510) 551-8777• Fax (510) 551-7888 <br /> 3035 Prospect Park Drive, Suite 80• Rancho Cordova, CA 95670 • (916) 631-1314• Fax (916)631-1317 <br />