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• • J <br /> Mr. Andy Alexander -2 - 29 May 2001 <br /> — All wells shall be surveyed for position and elevation to the nearest 0.01 foot accuracy. The existing <br /> wells shall be included in the survey. The survey shall be performed by a California licensed Civil <br /> Engineer or Land Surveyor. The survey report shall be included as an Appendix to the Groundwater <br /> Monitoring Well Installation Report. <br /> — The groundwater sample collection description includes a measurement of the groundwater <br /> elevation. The workplan should state that the groundwater level will be allowed to equilibrate prior <br /> to recording the depth to groundwater. <br /> — Provide a table that presents the analytes, analytical method, container size, container material, <br /> preservatives, and analytical method hold times. Groundwater analytes that are required in the <br /> revised monitoring program are listed below: <br /> Elevation <br /> Nitrate as Nitrogen, <br /> • Total Dissolved Solids, <br /> • Volatile Dissolved Solids, <br /> pH, <br /> • Standard Minerals (Calcium,Magnesium, Sodium, Chloride, Sulfate, Alkalinity Series, <br /> Hardness). <br /> — Use of a two-inch outside diameter well casing will prevent use of standard sized pumps and <br /> sampling equipment. The minimum acceptable inside diameter well casing is two-inches. <br /> — The workplan does not state what the annular seal material will be. Please describe this material; it <br /> must be consistent with SJCEHD Well Standards Section 13.12.3. Bentonite is generally not an <br /> acceptable annular seal material for land application monitoring systems because of its high cation <br /> exchange capacity. <br /> — If a slip cap is used on the bottom of the well casing, it must be secured using stainless steel screws. <br /> — The project schedule presented in the workplan is not consistent with the Regional Board schedule <br /> presented in the 14 February 2001 Regional Board request for reports correspondence. California <br /> Concentrates shall submit the groundwater well installation report by 29 June 2001. <br /> Please resubmit the Groundwater Monitoring Workplan by 8 June 2001. It is recommended that <br /> California Concentrates begin scheduling contractors for implementation of the workplan. If you have <br /> any questions on this conditional approval, please telephone me at (916)255-3116. <br /> TIMOTHY R. O'BRIEN <br /> Waste Discharge to Land Unit <br /> San Joaquin River Watershed <br /> cc: Mr. Mike Huggins, San Joaquin County Environmental Health Department, Stockton <br /> Patrick Dunn, Jacobson Helgoth, Folsom <br /> Dan Hinrichs, DJH Engineering, Placerville <br /> c:wm)eci FnevilwC domza CoMm. ]nm 52WLDOC <br />