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GEOTECHNICAL <br /> ENVIRONMENTAL <br /> � . EO <br /> WATER RESOURCES <br /> I N C O R P O R A T E D <br /> CONSTRUCTION SERVICES <br /> Project No. <br /> 4943.4.640.01 <br /> July 23, 2007 <br /> Mr. Chris Johnson <br /> Shea Mountain House, LLC <br /> 2580 Shea Center Drive <br /> Livermore, CA 94551 <br /> Subject: Mountain House Water Treatment Plant Expansion Project <br /> San Joaquin County, California <br /> RESPONSE TO CONDITIONAL APPROVAL, GROUNDWATER <br /> MONITORING WORKPLAN <br /> References: 1. Regional Water Quality Control rd, tral Valley Region, Conditional <br /> Approval, Groundwater Monit I g Work , Mountain House CSD and <br /> Trimark Communities, San Jo in, Runty, Ji y 17, 2007. <br /> 2. ENGEO Incorporated, G at onitoring Workplan, Mountain House <br /> Water Treatment Plant E ' n ` ject, San Joaquin County, California; <br /> Project No. 4943.4 1, 1 007. <br /> Dear Mr. Johnson: <br /> ENGEO Incorporated has ". epare is� tter in response to the Conditional Approval letter <br /> (Reference 1) received from Reg,a al Water Quality Control Board, Central Valley Region <br /> (Board), for the ENGEO Work :`' ted April 17, 2007 (Reference 2). ENGEO is proceeding <br /> to execute the Workplan in accor ce with the Boards conditions as detailed herein. <br /> Condition No. La <br /> ENGEO will construct the groundwater monitoring wells with 10-foot-long screens at a depth <br /> interval consistent with the first encountered groundwater. While we anticipate the depth to <br /> groundwater to be approximately 8 to 12 feet below the ground surface (bgs) in the vicinity of <br /> the site, this can not be currently verified, as groundwater wells do not exist at the site. During <br /> the drilling process for the well installations, we will note saturation of the subsurface soils and <br /> determine the depth interval of the well screens. It is anticipated that the wells will be installed <br /> in late July or early August at a time with groundwater levels are seasonally low. Therefore, we <br /> will place the approximate midpoint of the well screens at the groundwater levels observed <br /> during well installation to help provide that the screens span the water table and that there is <br /> sufficient water in the wells to collect representative samples. <br /> 580 N.Wilma•Suite A•Ripon,CA 95366•(209)835-0610•Fax(888)279-2698 <br /> www.engeo.com <br />