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HALEY&ALDRICH, INC. <br /> 'CH 426 17th Street <br /> Suite 700 <br /> '%EK Oakland,CA 94612 <br /> 510.879.4544 <br /> June 30, 2025 <br /> File No. 0130215-015 <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> Attention: Amber Ginorio, P.G. <br /> Subject: Piezometer and Monitoring Well Installation Work Plan <br /> Former Nestle USA, Inc. Facility <br /> Ripon, California <br /> Dear Ms. Ginorio: <br /> On behalf of Nestle USA, Inc. (Nestle), Haley&Aldrich, Inc. (Haley&Aldrich) prepared this Piezometer <br /> and Monitoring Well Installation Work Plan (Work Plan) describing the proposed installation of two <br /> piezometers and one monitoring well to support remedial actions and groundwater monitoring efforts <br /> associated with the former Nestle facility located at 230 Industrial Avenue in Ripon, California (Site; <br /> Figure 1). <br /> Background <br /> Pursuant to the Cleanup and Abatement Order No. R5-2006-0720 (CAO), Nestle prepared and submitted <br /> a Final Remedial Action Plan (RAP)to the Central Valley Regional Water Quality Control Board (Water <br /> Board)to document the current remedial actions completed and ongoing and to develop, evaluate, and <br /> recommend remedial actions to address areas of the Site that warrant remediation (Haley&Aldrich, <br /> 2025b). One of the key components of the RAP is the continued operations, maintenance, and <br /> optimization of the two groundwater extraction,treatment, and reinjection systems for the Site, <br /> including the Walnut Avenue System and the North Area Treatment System (NATS).To support <br /> monitoring and optimization of the treatment systems,the RAP proposes the installation of two <br /> piezometers for the NATS and one downgradient monitoring well for the Walnut Avenue System.These <br /> installations are further summarized in the following sections. <br /> NORTH AREA TREATMENT SYSTEM PIEZOMETERS <br /> The NATS is a groundwater extraction and treatment system that targets COCs in Intermediate Aquifer <br /> groundwater. Nestle constructed the NATS in 2022 and 2023 at the Ripon Public Schools property to <br /> capture COCs in the Intermediate Aquifer and expedite groundwater cleanup.The NATS extracts <br /> groundwater from two extraction wells, RPS-1 and RPS-3 (screened in the C1 and C2 Zones, <br /> respectively). Extracted groundwater is conveyed to the treatment system located at the northern end <br /> of the Ripon Public Schools property and treated by adsorption in two 10,000-pound granular activated <br /> www.haleyaldrich.com <br />