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2101 Webster Street <br /> 12th Floor <br /> Oakland, CA 94612 - e-. 'y-{G9qtEeOMATRp�IX <br /> (510) 663-4100 • FAX C5101 663-4141 <br /> January 03, 2000 {}tucrAve.ItlitEl i k zl; <br /> Project 4780.001 ttTrkt n,'CA 3b2W! '0 <br /> M!DD <br /> F ;<.:,$)468-3420 <br /> �PP�wecG <br /> Mr. Michael J. Infurna, Jr. Remarks <br /> San Joaquin County Public Health Services <br /> D iV 27 u ziiur <br /> Environmental Health Division -- -- ---�---------- <br /> M.__._�.,_ <br /> P.O. Box 388 _. <br /> Stockton, CA 95201-0388 <br /> o t-l0 2ooc� i`yti( <br /> Subject: Monitoring Well Destruction Work Plane <br /> Surland Homes Property a".=Z(" val ri'"t it' r?^'?fi ate ;!? ;, only 4r,1ni <br /> Tracy, California r `t�r i ;fait <br /> Dear Mr. Infurna: <br /> Geomatrix Consultants, Inc. (Geomatrix)has prepared this workplan on behalf of Chevron <br /> Environmental Management Company (Chevron) for work to be conducted at the Surland <br /> Homes Property(Figure 1). This work plan was developed in response to a November 8, 1999 <br /> letter(attached)to Chevron from the Regional Water Quality Control Board (RWQCB) <br /> granting permission to destroy monitoring well TW-2 at the Surland Homes Property. The <br /> proposed scope of work is described below. <br /> Geomatrix will oversee the destruction of one groundwater monitoring well (TW-2) at the <br /> location shown on Figure 2. Prior to field activities, Geomatrix will obtain a well destruction <br /> permit from the San Joaquin County Public Health Services (SJCPHS) and schedule a fencing <br /> subcontractor to remove a portion of the fence enclosing the monitoring well to allow access <br /> for the drill rig. Upon receipt of the permit, the monitoring well will be destroyed using <br /> hollow-stem auger methods. Per a request from the SJCPHS,the monitoring well will be <br /> drilled out to one foot below the bottom of the well (total depth of 15 feet below ground <br /> surface) to ensure that all material associated with the well is removed from the ground. Once <br /> the well is removed, the borehole will be backfilled with grout to approximately 1.5 feet below <br /> grade to accommodate future landscaping activities; the upper 1.5 feet will be backfilled with <br /> native soil. Once the well destruction is complete,the fencing contractor will repair the <br /> removed portion of the fence. All material generated during the well destruction activities will <br /> be sealed in a 55-gallon drum and properly disposed of the same day. Documentation of the <br /> well destruction activities will be included in the next quarterly groundwater monitoring report <br /> (January-March 2000). <br /> Geomatrix Consultants, Inc. <br /> Engineers, Geologists, and Environmental Scientists <br />