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FILE COPY <br /> ENVIRONMENTAL HEALTHDEPARTMENT <br /> ...........c� SAN JOAQUIN COUNTY <br /> ?. Donna K.Heran,RE.H.S. Unit Supervisors <br /> WDirector 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,RE.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> c4tiFoaaPProgram Manager Telephone: (209)468-3420 Margaret L gorio,R.E.H.S. <br /> ulla, <br /> Program Man <br /> Laurie Co Man R.E.H.S. Telephone: <br /> (209)464-0138 Robert McClellon,R.E.H.S. <br /> Manager Mark Barcellos,R.E.H.S. <br /> Jeff Hopkins <br /> Western Oil & Spreading Inc. JUN 0 4 2002 <br /> PO Box 709 <br /> Martinez, CA 94553 <br /> Re: Western Oil and Spreading Site Code: 1927 <br /> 19256 N Hwy 99 <br /> Acampo, CA 95220 <br /> WORKPLAN: Workplan for Soil and Groundwater Characterization <br /> DATED: May 8, 2002 <br /> PREPARED BY: D.K. Barber P.E. &Associates <br /> APPROVED with Conditions (See comment below).K <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by : <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> Install at least 5 Geoprobe borings to collect soil and groundwater samples on and off site to <br /> evaluate the extent of the contamination. <br /> COMMENTS AND CONDITIONS: <br /> 1. Section 5.2 Potential Monitoring Well Location is not acceptable. Previous <br /> agreement with San Joaquin County District Attorney requires you to install at <br /> least 2 more monitoring wells on site to obtain groundwater flow gradient. <br /> Install the 2 monitoring wells on site no later than July 8,2002. Soil samples <br /> from vadose,capillary fringe,and total depth should be collected for analyses. <br /> Installation of the two monitoring wells on site is not an option. <br /> 2. Barber stated one of the objectives of the above-referenced work plan is to make <br /> risk-based decisions for remediation (Section 1.4). Note that Regional Water <br /> Quality Control Board does not accept risk-based closure. Decision for <br /> remediation of contamination should be based on the mass and size of the <br /> contamination,impact or potential impact to groundwater, and numerical <br /> standards such as Maximum Contaminant Levels of chemicals in groundwater <br /> established by the Department of Health. San Joaquin County Environmental <br /> Health Department(EHD) does not concur with risk-based objectives or related <br /> languages in the approval of a work plan for additional investigation to define <br /> the extent of the contamination as required under California Code of Regulations <br /> Title 23. <br />