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ENVIRONMENTAL HEALTH bEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran RE.H.S. Unit Supervisors <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,RE.H.S. Stockton, California 95202-2708 <br /> p <br /> Program Manager Douglas W.Wilson,R.E.H.S. <br /> 4�iFOR`'� Laurie A.Cotulla,RE.H.S. Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> Jeff Hopkins APR 0 2 2002 <br /> Western Oil & Spreading Inc. <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 /> San Joaquin County Environmental Health Department(EHD)has received and reviewed Interim <br /> Summary of Findings(the report)dated April 30,2001 with February 28, 2002 Addendum <br /> prepared by Dan Barber. Analytical results of the soil samples collected from soil boring C-2 at <br /> the northeast comer of the property were 9,900 milligrams per kilogram mg/kg of Total Petroleum <br /> Hydrocarbons extractable (TPH-e)at 35 feet below surface grade(bsg)and 15,500 mg/kg of <br /> TPH-e at 40 feet bsg. The results of soil samples from C-4 located at the eastern edge of the <br /> property were 2,930 mg/kg of TPH-e at 25 feet bsg,and 1,240 mg/kg of TPH-e at 30 feet bsg. <br /> Analytical results of the groundwater samples collected from monitoring well#1 (MW-1)in <br /> January 2002 were 1,200 micrograms per liter(gg/l)of TPH-diesel. The report referenced the <br /> presence of private wells on the north and east neighboring properties. <br /> The report states that groundwater gradient and flow direction was determined using two off-site <br /> irrigation wells and one on site well. Please be advised that groundwater gradients must be <br /> determined by information from properly constructed monitoring wells not irrigation or other wells. <br /> The extent of the contamination in both soil and groundwater has not been defined. Submit a <br /> work plan to EHD that will define the extent of the contamination immediately to comply with San <br /> Joaquin County District Attorney Office requirements. Currently MW-1 is the only monitoring well <br /> on site. EHD directs you to install at least two additional monitoring wells on site to confirm the <br /> on-site groundwater contamination and to provide data to calculate groundwater gradient flow <br /> direction. <br /> EHD directs you to conduct a 2000-foot well survey and submit the results including properly <br /> scaled and labeled map, site addresses,any known pumping rates, and any known construction <br /> details of the wells. A work plan for a well survey is not required. <br /> If you have any questions contact Jeffrey Wong at(209)468-0335. <br /> Donna Heran, RENS, Director <br /> Envi onmental Health Department <br /> A <br /> `��� <br /> Jeffre�ong, ior REHS Margare agorio, RENS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWOCB, Central Valley Region—Marty Hartzell <br /> c: SJCADA- David Irey <br />