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terraphase <br /> e n g i n e e r i n g <br /> May 8,2014 <br /> Mr.Todd Del Frate,P.G. <br /> Engineering Geologist <br /> WDR Compliance and Enforcement <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova,California <br /> Sent via:email <br /> Subject: Work Plan Addendum to Install Compliance Groundwater Monitoring Wells, Musco Family <br /> Olive Company,Tracy,California <br /> Dear Mr. Del Frate: <br /> Terraphase Engineering Inc. (Terraphase) has prepared this work plan addendum on behalf of Musco <br /> Family Olive Co. (Musco)to set forth the procedures for decommissioning recently installed monitoring <br /> well MW-35 and reinstalling the monitoring well (as MW-35R)further east of the proposed surface <br /> impoundments to be built for the Musco facility located in Tracy,California (Figure 1). In addition,this <br /> work plan addendum discusses the potential installation of two piezometers that can provide the flow <br /> direction and gradient of groundwater in the first water bearing zone expected to be encountered at <br /> MW-35R. <br /> Monitoring well MW-35(Figure 2)was originally installed at a location adjacent and down gradient of <br /> the proposed northern surface impoundment sump. However,due to a revision in the water balance <br /> prepared for the facility,the surface area of the proposed surface impoundments increased and the <br /> location of MW-35 is now within the revised footprint of the proposed surface impoundments. <br /> Therefore, MW-35 will be decommissioned and reinstalled as MW-35R at the approximate location <br /> illustrated on Figure 2.The monitoring well decommissioning and monitoring well/piezometer <br /> installation procedures are discussed below. <br /> Monitoring Well Decommissioning <br /> Pre-Field Activities <br /> The project Health and Safety Plan (HASP)will be amended to address the well decommissioning <br /> activities described in this Work Plan. In addition,the applicable county permits required for the work <br /> will be obtained. <br /> Monitoring Well Abandonment <br /> Monitoring Well MW-35 is located within the revised footprint of the proposed surface impoundments. <br /> Therefore,to seal a potential vertical conduit below the future surface impoundments,Monitoring Well <br /> Terraphase Engineering Inc. <br /> 1404 Franklin Street,Suite 600 <br /> Oakland,California 94612 <br /> w Jerraphase.corn <br />