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On April 18, 2005 Environmental Health Department reviewed Advanced Geological <br /> Engineering work Plan and recommended utilizing an inline filter to collect for <br /> manganese and ferrous iron analysis, the work plan and Addendum approved. <br /> Year ending 2005 Procedures included: <br /> Ground water treatment operation and monitoring <br /> Low flow well monitoring and water sample collection. <br /> Well monitoring, purging, and ground water sample collection and analysis. <br /> In 2006 well monitoring and evacuation continuing <br /> Collection and analysis of ground water samples <br /> Operation of the existing on site ground water extraction (GWE) system <br /> On December 15th. 2006. Advanced Geological Engineering submitted Ground water <br /> Extraction —Work Plan Addendum: The objective of this work plan was to enhance the <br /> limited ground water extraction network currently on the site and produce an adequate <br /> draw down for the dissolved plume capture. <br /> March 4th and 15`h 2007 three ground water extraction wells, EW4, EW5, <br /> EW6 were installed at the site for performance of a ground water extraction. Approved <br /> by Environmental Health Department by letter dated February 23, 2007. It should be <br /> noted the ground water remediation system was inoperable between May 2005 and late <br /> September 2007. The ground water extraction system ceased operation May 10, 2005. <br /> Between September 24, 2007 and December 31, 2007 groundwaters pump and treat <br /> system was in operation at this site. <br /> August 20th 2007, Advanced Geological Engineering submitted Work Plan —Treatment <br /> System. Scope of work included the installation of a new ground water extraction <br /> pumps in the recently installed ground water extraction wells to enhance the ground <br /> water extraction network currently on the northern portion of the site. <br /> March 25th. 2008 Advanced Geological Engineering submitted a position paper for <br /> Consideration for Site Closure (NFARRR) Advanced Geological Engineering supports <br /> site closure for the facility based upon general site conditions and the overall <br /> technological difficulty of additional mass removal (the remaining 5 %) is unlikely to be <br /> cost-effective. <br /> April 25th 2008 State Water Resources Control Board (SWRCB) LETTER Preliminary <br /> 5-year review summary under the name of Robert Trommer recommends that the San <br /> Joaquin County LOP direct the Responsible Party (Chapin Bros, Inc) to reassess the <br /> efficiency of the current treatment system and to implement additional treatment <br /> technology as necessary to achieve Water Quality Objectives in a timely manner. <br />