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Mr. Andy Alexander - 2 - 13 June 2001 <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 well casing diameter is two-inch inside diameter. <br /> • The workplan does not clearly state what the annular seal material will be. Please describe this <br /> material; it must be consistent with SJCEHD Well Standards Section 13.12.3. Bentonite is generally <br /> not an acceptable annular seal material for land application monitoring systems because of its high <br /> cation exchange capacity. If concrete is used it must be placed using a tremie pipe to avoid <br /> separation of aggregate during placement. cat cement is anaecepta a annu arse ma enal. <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 correspondence. California Concentrates shall submit the <br /> groundwater well installation report by 29 June 2001. <br /> Please address the comments in this conditional approval by 19 June 2001. If you have any questions <br /> 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 /> cw.n)mt ra rsi��ali nia ancrnna "061301.wc <br />