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ENVIRd-r MENTAL HEALT I)EPARTMENT1- <br /> °��" SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Q, Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> . , Director D.I. <br /> R. <br /> ,Mike Huggins,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R..S.,R. S. <br /> meq:. �P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S: <br /> i F o a Laurie A.Cotulla,R.E.H.S. <br /> Program Manager <br /> Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> DALE BOYETT <br /> BOYETT PETROLEUM <br /> P O BOX 576277 <br /> MODESTO CA 95357-6277` <br /> Re: BOYETT PETROLEUM Site Code: 1433 <br /> 419 S. MAIN ST. <br /> MANTECA CA 95336 <br /> WORKPLAN: Interim Remediation Work Plan DATED: June 25,2003 <br /> PREPARED BY: Condor Earth Technologies,Inc.- <br /> APPROVED iK - with Conditions/See Below . <br /> ADEQUATE AND NECESSARY ELEMENTS.OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> 1. Destroy the.two damaged monitoring wells MW-4 and MW-5 by over-drilling to <br /> approximately 25 feet bsg and removing all well construction material. <br /> 2. Installation of a 2-inch monitoring well to replace MW4. <br /> 3. Installation of a groundwater pump and treat system in anticipation of interim <br /> remediation. Coconut shell granulated activated carbon canisters will be used to treat <br /> groundwater before discharge to City of Manteca sanitary system (upon approval). <br /> 4. Installation of a 4-inch extraction well EW-1 to 40 feet bsg with 25 feet of screen <br /> section near MW-7. <br /> 5. Conduct a 72-hour constant rate pump test using EW-1 to determine the radius of <br /> influence and optimum extraction rate for groundwater remediation. Modification of <br /> the pump rate is optional over the length of the test based on field data. <br /> 6. Collect 4 water samples for laboratory analyses over the duration of the pump test. <br /> COMMENTS_ AND CONDITIONS: _ <br /> 1. Over-drilling of MW-5 must continue to 30 feet bsg. <br /> 2. Implement installation of the proposed wells by October 26,2003. <br /> 3. Implement pump test by November 26,2003: <br /> 4. EHD recommends you begin the application process for a permission to discharge <br /> treated groundwater to the sanitary system from City of Manteca immediately to avoid <br /> potential delay to the proposed pump test. <br /> DATED August25,2003 BY <br /> Cc: CRWQCB,Central Valley Region—James L.L.Barton,RG <br /> Cc. Condor Earth Technologies,Inc.—Lee H.Morse <br /> il . <br />