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KL E/NFEL DER <br /> Bright Peopl,Right Solutions. <br /> WORK PLAN ADDENDUM <br /> Limited Groundwater Sampling and Analyses <br /> Proposed Land Application Area 7R <br /> Oakwood Lake Water District <br /> Wastewater Treatment Facility <br /> Manteca, California <br /> The RWQCB drafted a letter in response to Oakwood Lake Water District's (OLWD) <br /> work plan to install temporary well points in the area of 44 formerly proposed residential <br /> lots. These lots are currently proposed to be used as a set-back seepage berm area <br /> for levee improvements by Reclamation District 17 (RD 17). The work plan was titled <br /> "Work Plan, Limited Groundwater Sampling and Analyses, Proposed Land Application <br /> Area 7R, Oakwood Lake Water District, Wastewater Treatment Facility, Manteca, <br /> California," dated March 26, 2010 (File No. 48093.E01/ST01 R109). The RWQCB's <br /> response letter was addressed to Mr. Mike Gilton, District Engineer for OLWD and was <br /> titled "Conditional Approval, Groundwater Monitoring Workplan, Oakwood Lake Water <br /> District, Wastewater Treatment Plant, San Joaquin County," dated April 8, 2010. The <br /> conditional approval letter requested the OLWD to "..address the following items in a <br /> written addendum prior to implementing the Workplan." Action items and comments to <br /> address the board's numbered items are provided in italics: <br /> 1. Written project acceptance from a person of authority with the oversight <br /> agency, Reclamation District 17. The 44 lots in the set-back area are <br /> approximately 100 feet long, extending northward from the toe of the RD 17 <br /> Levee. The proposed set-back seepage berm area for the levee extends <br /> approximately 65 feet from the toe of the levee. Kleinfelder proposes installing <br /> the well points outside of this proposed set-back area and near the northern <br /> edge of the lot lines. <br /> 2. The work plan describes installation of four temporary wells. Please describe: <br /> a) How the wells will be secured to prevent access. The temporary wells <br /> will be capped firmly with a PVC slip cap and placed within a flush <br /> mounted and secured irrigation box with a bolted lid. <br /> b) How the bentonite grout will be placed (the bentonite must be <br /> hydrated and installed using a tremmie pipe or acceptable alternative). <br /> After the initial sampling event is completed, a 2-foot bentonite well seal <br /> using either chips or pellets will be placed above each sand pack using <br /> lift intervals of approximately 1 foot. Each lift interval will be hydrated <br /> with distilled water. It is estimated that the depth of the bentonite seal <br /> placement will be approximately 12 feet below ground surface and will <br /> 48093.E01/ST010R161 Page 1 of 2 April 19, 2010 <br /> Copyright 2010 Kleinfelder <br />