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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> :{ Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> ` Al Olsen,R.E.U.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • c. _�_ P Program,Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> RLi r o'R�' Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-01.38 Robert McClellon,R.E.H.S. <br /> Prograni Manager Mark Barecilos,R.E.H.S. <br /> ULTRAMAR INC <br /> 685 WEST THIRD STREET <br /> HANDFORD CA 93230 <br /> SAYED & ZAKIA ABDELWAHED <br /> 740 WEST OAK ST <br /> STOCKTON CA 95203 <br /> Re: ZE AUTO REPAIR(ABDELWAHED FACILITY/ULTRAMAR NO. 13792) <br /> 2255 SOUTH AIRPORT WAY <br /> STOCKTON, CA 95206 <br /> WORKPLAN: Work Plan for Additional Site Investiggtion and Feasibili Testin <br /> DATED: November 9 2004 PREPARED BY: Horizon Environmental Inc. <br /> SL APPROVED with Conditions (See Below). <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN <br /> (H&S 25296.10, (c)(3).): <br /> 1. Install 4 monitoring wells M%V-5 to MW-8 with screen interval 35 to 55 feet bsg(similar <br /> to existing M\V-1 to MWA) to define the lateral extent of the groundwater <br /> contamination plume. <br /> 2. Install two vapor wells VW-1 and VW-2 with screen interval 37 to 52 feet bsg. <br /> 3. Install one air sparge well SW-1 with screen interval 60 to 65 feet bsg. <br /> 4. Conduct feasibility tests for soil vapor extraction and air sparge system evaluate <br /> potential interim remediation. <br /> COMMENTS AND CONDITIONS: <br /> 1. Although oxygenates were not detected in previous investigation, the detection limits of <br /> the analyses of MW-1 samples Guly 2003)were too high. Therefore,all 5 oxygenates <br /> should be analyzed in this investigation to confirm the presence/absence of oxygenates. <br /> 2. The deepest boring proposed in this work plan is to 65 feet bsg. It is unlikely that the <br /> scope of the work plan would be able to define the vertical extent of the contamination. <br /> In a telephone conversation with Horizon on November 9, 2004,EHD stated that a <br /> separate proposal with deeper borings using technologies such as cone penetrometer <br /> should be submitted to EHD to identify the lithology and define the vertical extent of <br /> the contamination of the site. However,EHD does not require the submission of this <br /> additional proposal before implementation of the above-referenced work plan. <br /> 3. Include cross-sections of the lithology and concentration contour in the report. <br /> 4. Begin implementation of the proposed work by December 15,2004. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25296.10 (c)(3).): <br /> None C <br /> DATED November 9.2004BY4 } (/v <br /> C: RWQCB,Central Valley Region—James L. L.Barton,RG <br /> C: Horizon Environmental,Inc.—Gary D. Barker <br />