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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ®� <br /> ENVIRONMENTAL HEALTH DIVISION mi <br /> Karen Furst, M.D., M.P.H. , Health Officer • �... <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> ��jtiRa�Y . <br /> 209/468-3420 <br /> ED RALSTON <br /> TOSCO MARKETING COMPANY <br /> 2000 CROW CANYON PLACE, SUITE 400 <br /> SAN RAMON CA 94583 <br /> WORK PLAN: Work Plan for Additional Site Assessment, Well Survey, and Site Conceptual Model <br /> DATED: May 23, 2001 <br /> PREPARED BY: Secor <br /> APPROVED: <br /> ISA "R VED: <br /> ADDENDUM NEEDED: submitbv: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [1-186 25299.37,subd(c) (3)1: <br /> 1. Tosco will install three additional monitoring wells and one continuous core to define the vertical and lateral <br /> extent of gasoline and MTBE contamination in soil and groundwater. <br /> 2. Tosco will conduct a well receptor survey with a 2000 foot radius. <br /> 3. Tosco will began to develop a Site Conceptual Model which will be used to investigate and assess the impacts <br /> of the release. <br /> 4. All samples must be analyzed for TPH g, BTEX and fuel oxygenates. <br /> COMMENTS AND CONDITIONS: <br /> The "Tri-Regional Board Staff Recommendations For Preliminary Evaluation and Investigation of Underground Tank <br /> Sites" along with its "Appendix t1 and "Appendix B" should be used as guidance documents. All work and report - <br /> which require geological or engineering evaluation must be performed under the direction of an appropriate California <br /> registered or certified professional. <br /> DATED r ��oi BY <br /> Harlin Knoll, Senior REHS 209) 468-3442 <br /> CC: RWQCB, Central Valley Region-Marty Hartzell <br /> Secor-Benkosky <br /> A Division of San Joaquin County Health Care Services <br />