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KLEINFELDER Reviewing the disposition of the PCE/TCE contamination plume at the ARL, requires a formal request be made to the State of California Regional Water Quality Control Board (RWQCB) to review existing files for the most recent remedial activities, and status of clean-up efforts. Additionally, a file review will also be conducted from the San Joaquin County Environmental Health Department (EHD). TASK 2 — MONITORING WELL INSTALLATION The Task 2 goal is to establish current shallow groundwater conditions prior to actual on-site work beginning. The data describing the "baseline" condition will be for supporting the pending environmental impact report (EIR), along with facilitating our assessment of the shallow aquifer as a receiving "unit' for potential groundwater recharge on-site. One operational component of on-site operations is the water features (i.e. lakes), which will require re-filling on a regular basis. Our understanding is that the City of Stockton (City) will be far more receptive to a plan that encompasses a "dual use' for the lakes, specifically using the lakes for groundwater recharge, along with the irrigation use for the development. We will be establishing shallow groundwater elevations, along with the basic chemical composition. We can then describe the potential beneficial impacts, and associated artificial recharge, such as improved water quality in this shallowest aquifer. Installation Kleinfelder proposes installing up to nine shallow groundwater-Mqr, utuing, wp s within the cite xa ndaries. The groundwater monitoring wells will be installed to collect groundwater samples and measure groundwater levels throughout the site area. The data gathered from the monitoring wells will be utilized to establish the baseline or existing shallow groundwater conditions prior to the development activities. The locations of the monitoring wells will be selected based upon recent site plans and to assess and monitor groundwater conditions at the site. We will attempt to locate the monitoring wells outside of operational areas, developed areas, roadways, etc., to reduce the risk that they might be damaged during construction activities. Stantec Consulting, Inc. will assist Kleinfelder on this task. The EHD requires completion of a well/boring permit, and payment of fees prior to installation of monitoring wells. Once contracted to conduct the work, Kleinfelder will prepare drilling permit applications for submittal to EHD along with the required fees. The permits must be approved prior to drilling activities. EHD usually requires up to two weeks to issue the permits. The drilling subcontractor will contact Underground Service Alert 48 hours prior to conducting fieldwork to notify local utilities of our proposed subsurface assessment. 02001 PROP.ENV/ST05P346R/JDZ:Iv Page 2 of 12 ©2005 Kleinfelder, Inc. December 2, 2005