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• • Remediation Well Installation Work Plan New West Flag City Facility ' August 7 2008 6437 W Banner Street, Lodi, California ' Granular Activated Carbon (VGAC) vessels and three 1,000-1b Liquid Granular Activated Carbon(LGAC) vessels were installed at the Site and began operation on September 9, 2006. ' For the purpose of further delineating the lateral and vertical extent of the contaminant plume, as well as to install sentry wells near CSA-31-1 and CSA-31-2, monitoring wells MW-3 C, MW-4C, ' MW-7A, MW-713, MW-8A, MW-8B, MW-913, MW-9C and MW-91) were installed by APEX in July 2006. ' On May 1, 2007, the New West facility was issued Cleanup and Abatement Order No. R5-2007- 0709. On May 8, 2007, Closure Solutions, Inc. became the Environmental Consultant of ' Record for the Site. From May 24, through May 29, 2007, Closure Solutions modified the existing groundwater extraction system treatment train to remove the air stripper and replace the ' VGAC and LGAC vessels with two 2,000-1b and one 1,000-1b LGAC vessels. On November 15, 2007, Closure Solutions submitted a Preliminary Investigation and Evaluation ' Report (PIER) for the installation of 8 newly installed groundwater monitoring wells (MW-IOA through MW-IOD, MW-IIB, MW-12A, MW-13A and MW-13B) and collection of four soil ' vapor samples (SV-1 through SV-4). On November 30, 2007, Closure Solutions oversaw the reinstallation of monitoring well MW-IOD due to an obstruction in the well at approximately 15 feet below ground surface (bgs). ' On November 30, 2007, Closure Solutions submitted a Risk Assessment Report evaluating the human health and environmental risk associated with impact at the Site. Modeling indicated that ' the concentrations of contaminant vapors both currently present in soil beneath the Site and vapors emanating from underlying contaminated groundwater will not create a condition of significant health risk. ' Under the direction of the Regional Board, on January 29, 2008, Closure Solutions submitted a Preliminary Assessment Report (PAR). In accordance with the Tri-Regional Guidelines, this report included: ' • The depth and extent of free product found, including an estimate of volume removed and volume remaining. ' • Figures delineating lateral and vertical extent of soil contamination, groundwater degradation plume(s), and vapor plumes as appropriate. ' Page 3 of 9