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Mr. James B. O'Connor s1 2 April 23 , 1987 <br /> characterize soil contamination. The floor-wall joint <br /> next to the old copper-sulfate solution tank location <br /> has been caulked. When did this occur? <br /> 4 . In light of the use of dredged materials as fill, <br /> further upgradient sampling is advised to establish a <br /> range of background metals concentrations. <br /> 5. Information on wells within a one mile radius of the <br /> site must be presented to supplement page 4-8 . Wells <br /> in addition to 4J1 should be reviewed. Water quality <br /> and well drilling ,logs are available from the Central <br /> District of the California Department of Water <br /> Resources 3251 "S" Street, in Sacramento. The San <br /> Joaquin County Department of Health also has water <br /> quality data. ii <br /> Attached is a signed request form you must present to <br /> obtain access to these records. In particular, some <br /> comparison of soil/rock horizons, depths-to-groundwater <br /> (including first w',Lter) , and water quality should be <br /> made between wells. <br /> 6. Further elaboration is needed to meet the requirements <br /> of Section 25356. 1 of the H & S Code. Specifically, <br /> items 2 and 3 of subpart C discussing beneficial uses <br /> of surface and groundwaters need to be addressed. <br /> Attached is a copy of the Basin Plan for the site. Mr. <br /> Dave Brent, Area Engineer for the Regional Water <br /> Quality Control Board can be contacted at (916) <br /> 361-5667 for further information. <br /> 7 . Confirmation samples must be analyzed for metals in <br /> addition to copper. Nickel, lead, tin, and chromium <br /> (VI) are not strictly subordinate to copper as <br /> indicated on page 6-1. <br /> 8 . The results from screening samples must be submitted. <br /> Their presentation will help in defining the lateral <br /> and vertical extent of contamination. <br /> 9 . The final transportation plan must be transmitted per <br /> page 6-2 . <br /> i <br /> Thank you for your cooperation to date. If you should have any <br /> questions on these comments, please call me at (916) 739-3860. <br /> sincerely, <br /> Lee Taubeneck <br /> Waste Management Engineer <br />