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ENVIRONMENTAL HEALTH EPARTMENT <br /> �a"{ry•.c SAN JOAQUIN COUNTY Unit Supervisors <br /> o. <br /> s.• �,�' •Po Carl Borgman,R.E. <br /> Donna K.Reran,R.E.x.s. 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> Director California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> :. Al Olsen,R.E.H.S. Stockton, <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> • QgCf F O'R�` S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: 209 464-0138 Robert M rcell s,R.E.H.S.. <br /> program Manager <br /> ( � Mark Barcellos,R.E.H.S. <br /> APR 1 2004 <br /> KEN HILLIARD <br /> 7-ELEVEN INC <br /> PO BOX 711 <br /> DALLAS TX 75221-0711 <br /> RE: 7-Eleven Store#32262 <br /> Site Code: #1505 <br /> 2360 Grant Line Road <br /> Tracy CA 95376 <br /> WORKPLAN: `Work Pian for Additional Assessment and Interim Remediation' <br /> DA fED. March 19,2004 <br /> PREPARED BY: SECOR International Incorporated <br /> APPROVED: with conditions,see below <br /> DISAPPROVED: ] <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299.37,subd(c)(3)1: <br /> 1. Installation of three shallow groundwater monitoring wells for lateral assessment of the shallow contaminant plume. <br /> The borings for these wells are proposed to be continuously cored from 10-17 feet bsg. <br /> 2. Installation of two cone penetrometor test(CPT)borings for assessment of the vertical extent of the contaminant <br /> plume. Proposed depth of the CPT borings is 80 feet bsg. Discrete soil and groundwater samples will be collected <br /> and submitted for analysis. <br /> tion well to perform <br /> 3. Installation of one groundwater extracrm a groundwater extraction feasibility study,and installation <br /> of one oxygen infusion sparge point to perform an oxygen infusion feasibility study. These studies are being done to <br /> determine the most appropriate method of interim temediation. Methods of each test are outlined in the work plan. <br /> C MMENTS AND CONDITIONS: <br /> 1. Hydropunch groundwater samples from the CPT borings should be collected from all appropriate permeable <br /> intervals,not just at total depth. <br /> 2. additional deep,discretely screened monitoring wells must be installed to define the lateral extent of the groundwater <br /> contamination at depth. Data obtained from the CPT investigation can be used to site these wells. <br /> I Biological data must be collected to support the idea that oxygen infusion will stimulate microbes to break down the <br /> MtBE contamination. <br /> 4. A San Joaquin County well permit application,and required$89.00 permit fee,must be submitted for each parcel of <br /> land on which drilling will be done;City of Tracy encroachment permits and/or access agreements from offsite <br /> property owners must be submitted to SJC/EHD with the permit applications. <br /> 3. A Report of findings must be submitted to SJC/EHD within 60 days following completion of all fieldwork.A Site <br /> Conceptual Model and work plan for installation of deep monitoring wells are due for submittal at the same time. <br /> Lori Duncan,Senior REHS Nuel C.Hend son,Jr_,R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton,CVRWQCB <br /> Brian Carey,SECOR <br />