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Monitoring Well Installation Report April 15, 2010 <br /> Former Nestle USA, Inc. Facility, Ripon, CA <br /> 1 INTRODUCTION <br /> Environmental Cost Management, Inc. (ECM) has prepared this Monitoring Well <br /> Installation Report for the Industrial and Stockton Avenue Extraction and Treatment <br /> Systems (Installation Report), on behalf of Nestle USA, Inc. (Nestle). The Installation <br /> Report documents the well installation activities completed in December 2009 and <br /> presents the results of soil and groundwater data from the new monitoring wells <br /> collected during and after the drilling activities. The focus area for this investigation is <br /> located in City of Ripon, approximately seven miles north of Modesto, California <br /> (Figure 1). <br /> ECM submitted a Work Plan' in June 2009, on behalf of Nestle, to the California <br /> Regional Water Quality Control Board (RWQCB) Central Valley Region, outlining the <br /> proposed activities for the 230 Industrial Avenue and 519 South Stockton Avenue <br /> locations. During an October 22, 2009, conference call between the RWQCB and ECM, <br /> the RWQCB requested modifications to the proposed well locations. In a Work Plan <br /> Addendum2 submitted on November 2, 2009, ECM addressed the changes requested by <br /> RWQCB. The RWQCB approved the proposed work on November 3, 2009. <br /> This Installation Report documents the drilling, sampling, and well installation activities <br /> completed in December 2009, and provides a detailed discussion of the analytical data <br /> collected during the field investigation. ECM completed the following scope of work in <br /> accordance with the RWQCB-approved Work Plan and Work Plan Addendum: <br /> • Two monitoring wells (M-50A and M-51A) were completed in the Upper <br /> Aquifer (A) Zone at 230 Industrial Avenue; <br /> • Two monitoring wells (M-5213 and M-5313) were completed in the Upper <br /> Aquifer (B) Zone at 519 South Stockton Avenue; <br /> • One monitoring well (M-54C) was completed in the Intermediate Aquifer (C) <br /> Zone south of the 519 South Stockton Avenue site in the Fifth Street right-of- <br /> way; and <br /> • Discrete groundwater samples were collected in selected, significant water- <br /> bearing zones from wells M-50A, M-51 A, M-52B, and M-53B. <br /> 2 TECHNICAL APPROACH FOR INVESTIGATION <br /> ECM completed installation of five monitoring wells at the locations depicted in Figure 2. <br /> The purpose for the installation of these five wells at the two locations is: <br /> 1) Installing two groundwater monitoring wells within the A Zone at the 230 <br /> Industrial Avenue site to evaluate the eastern and western extents of the capture <br /> zone of the Industrial Avenue Interim Remedial Action Plan (TRAP) Groundwater <br /> Treatment System wells EU-3 and EU-4 predicted with flow modeling; <br /> 2) Conducting a groundwater investigation within the B Zone beneath the <br /> Stockton Avenue location to determine if concentrations of trichloroethene (TCE) <br /> and its daughter product, collectively known as constituents of concern (CDCs) <br /> have been sufficiently reduced to justify shutdown of the Upper Aquifer Stockton <br /> Avenue Treatment System ( well E-2); and <br /> 1 <br />