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ENVIRONMENTAL HEALTHDEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bor man,R.E.H.S. <br /> Director <br /> N 304 East Weber Avenue, Third Floor Borg <br /> man, <br /> Olsen,R.E.H.S. Stockton, California 9$202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> " Douglas W.Wilson,R.E.H.S. <br /> c aw Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 9� F°R Laurie A.Corolla,R.E.H.S. <br /> ana er ram M <br /> Pro Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program g Mark Barcellos,R.E.H.S. <br /> Diggler and Wad LLC JUN 0 7 2006 <br /> Attn: Scott Damouny <br /> 2707 E. Fremont St., Suite 14 <br /> Stockton, CA 95205 <br /> RE: Diggler and Wad LLC Site Code: 0001781 <br /> 2478 E. Fremont Street APN: 14124023 <br /> Stockton, CA 95205 <br /> WORKPLAN: Additional Site Assessment Work Plan <br /> DATED: May 26, 2006 <br /> PREPARED BY: Advanced GeoEnvironmental Inc. — R. Marty <br /> STATUS: APPROVED with conditions noted below. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health & <br /> Safety Code (H&S) Section 25296.10(c)(3)1: <br /> • install first set of monitoring wells onsite (3 shallow, 1 deep) to <br /> investigate lateral and vertical extent of petroleum contamination from <br /> former USTs and, <br /> • collect and analyze "selected" soil samples for TPHg (8015m), BTEX <br /> (8260), EDB and 1,2-DCA (8260m), and total lead (6000) and, <br /> • Develop, survey, and quarterly sample and monitor wells and, <br /> • Submit a report of findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> • Proposed locations for the new monitoring wells do not provide for an <br /> investigation to the southwest to evaluate grab ground water <br /> contamination noted in soil boring SB-18 (Shell Oil). An additional <br /> shallow monitoring well is required to be installed during this phase in <br /> the immediate area of the other "former fuel dispenser islands" area <br /> noted in Figure 2 of the work plan. <br /> • Proposed "MW-1 B" (deep) is shown with a 20-foot screened interval. <br /> This length is excessive for a second saturated zone well. EHD will <br /> only permit a 5-foot screen interval for this deep well in the <br /> sands/gravely sands shown on the CPT log for Shell's boring, "SB-26" <br /> recently installed at this location. <br />