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41 C-0-SN <br /> CONDOR EARTH !s "CHNOLOGIES INC <br /> 188 Fraro- ,^last Circle Suite I <br /> Stockton CA 95206 <br /> Phone 209.234.0518 <br /> FAX 209.234.0538 <br /> CONDOR www.condorearth.corri " <br /> June 29,2005 <br /> Mr.Timothy O'Brien <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive,#200 <br /> Rancho Cordova, CA 95670-6114 <br /> RE: Addendum Letter <br /> Additional Monitoring Wells Installation Work Plan <br /> Pilkington North America,Lathrop, California <br /> Condor Project 3 15 1N <br /> Dear Mr. O'Brien: <br /> This Addendum Letter is prepared in response to the Conditional Approval received for'the subject Work <br /> Plan dated June 7, 2005. .This Addendum Letter is submitted on behalf of, and at the direction of, Roger <br /> Bishop at Pilkington North America. The following responses are provided for the comments in your <br /> Conditional Approval. <br /> 1. In conformance with the previous well survey, the additional wells will be surveyed relative to <br /> the location and elevation of the well collars of the City of Lathrop benchmark (brass cap) located in the <br /> southeast curb return at the intersection of Louise Avenue and Harlan Road at an elevation of 14.77 feet. <br /> The well collars will be surveyed with a vertical accuracy of 0.01 foot and horizontal accuracy of 1.0 foot. <br /> The measuring point for water-level measurements will be marked on each well collar. For quality <br /> control, at least one of the previous wells.will be'resurveyed to confirm that the relative elevation of the <br /> City of Lathrop benchmark has not changed. The survey will meet requirements of Geotracker, the State <br /> groundwater database. <br /> 2. We propose to defer definition of the monitoring network until the new wells have been installed <br /> and groundwater elevations for all eight monitoring wells have been measured. This will allow for a <br /> more definitive determination of groundwater gradient(s). We intend to define the monitoring network, <br /> prior to the third quarter sampling event. <br /> 3. We inadvertently used the Standard Minerals list from the wastewater monitoring. We do not <br /> intend to analyze the groundwater for more than the required constituents. <br /> 4. We have enclosed a Figure 2A (revised Figure 2) with the lawn area monitoring well moved <br /> closer to the main lawn and an additional well proposed immediately south of Area C. <br />