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Central Valley Regional Water Quality Control Board 6375.4.002.01 <br /> Yosemite Avenue Properties January 27,2005 <br /> RESPONSE TO CONDITIONAL WORK PLAN APPROVAL Page 2 <br /> FOR GROUNDWATER STUDIES <br /> surge blocks to maximize the hydraulic connection between the well and the surrounding aquifer <br /> material. Wells will be purged of a minimum of three casing volumes using a using a 12-volt <br /> pump while monitoring stabilization of groundwater parameters (temperature, pH and electrical <br /> conductivity). Purging will continue during well development until sediments are minimized. <br /> Purge water will be discharged to land onsite. <br /> Soil samples will be collected using a California Split Spoon Sampler containing 2'/z inch- <br /> diameter by 6-inch-long brass tubes. The brass tubes will be sealed using tight-fitting plastic <br /> caps. The soil samples will be on ice in a cooler during transportation using a chain-of custody <br /> record and immediately submitted to the laboratory for analysis. <br /> GROUNDWATER SAMPLING <br /> Sampling procedures and analytical test methods are summarized in the Groundwater Sampling <br /> and Analysis Plan included in Appendix A. The sampling analysis suite has been expanded to <br /> include chloride (instead of chlorine), and total and dissolved magnesium. Electrical <br /> conductivity, boron, sodium, iron, manganese, calcium, and potassium were included in the <br /> original workplan. <br /> If you have any questions on any portion of this work plan, please call and we will be glad to <br /> discuss them with you. <br /> Very truly yours, <br /> ENGEO INCORPORATED Reviewed by: <br /> Christopher A. Goddard, EIT Dennis B. Nakamoto, CEG, CHG, REA II <br /> Attachments: <br /> Proposed Well Construction Diagram <br /> Groundwater Sampling and Analysis Plan <br /> cc: Mr. John Scherer, TCN Properties, L.P. <br /> Mr. Timothy R. O'Brien, CVRWQCB,Waste Discharge to Land Unit <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br />