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352514yland Avenue,�uu 200 <br /> Costa <br /> Main (71416622759 Fax:17 4;662,2758 <br /> October 12, 2010 y� n <br /> Mr. Mike Infurna � k d <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street OCT 1 $ 2010 <br /> Stockton, CA 95202-3029 <br /> SANjo,, U?�r;pN , <br /> HEA_r, - ENT <br /> RE: Three Former Vapor Extraction Wells <br /> Former Nestle USA, Inc. Facility <br /> 230 Industrial Avenue <br /> City of Ripon, San Joaquin County V <br /> Dear Mr. Infuma: <br /> Per your discussion with Mr. Binayak Acharya of Environmental Cost Management, Inc. (ECM) on <br /> Monday, October 4, 2010, ECM has prepared the following history and proposal for <br /> decommissioning of the three former vapor extraction (VE) wells located at the above-referenced <br /> site (Figure 1). As previously discussed witp you and Ms. Adrienne Ellsaesser, ECM has <br /> completed several unsuccessful efforts in the past to locate these wells. Per your request, ECM <br /> has prepared this summary of information, which includes efforts completed to date, to assist the <br /> San Joaquin County Environmental Health Department (SJC-EHD) in making a decision regarding <br /> closure of these wells. <br /> HISTORY OF VE-4, VE-11, AND VE-12 <br /> Date Total Well Screened Filter Pack <br /> Well Drilled Depth Depth to Water Diameter Interval Interval <br /> (feet) (inches) (feet) (feet) <br /> VE-4 10/19/87 39.0 Unknown 4 7.0-37.0 5.0-39.0 <br /> VE-11 11/01/97 26.5 Terminated Above Water Table 4 10.0-25.0 8.0-26.5 <br /> VE-12 11/01/97 26.5 Terminated Above Water Table 4 10.0-25.0 8.0-26.5 <br /> • 1994-1998: VE-4 became untraceable as a result of site building demolition activities in 1994. <br /> The area where VE-4 and VE-12 were formerly located was graded and paved in asphalt in the <br /> late 1990s by the current property owner. <br /> 2005: ECM attempted to locate VE-4, VE-11, and VE-12 with metal detectors using coordinates <br /> triangulated from a historic map. No wells were located during the search. <br /> 1 <br />