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XERXESA <br /> CORPORATION <br /> October 6, 2008 <br /> To: San Joaquin County Environmental Health Department <br /> Attn: Muniappa Naidu E-mail: mnaidu@sjcehd.com <br /> Re: 10-ft., 12,000 gallon, DWII double wall tank <br /> Circle K/Tosco SS#27-01205 <br /> 16470 Cambridge <br /> Lathrop, CA 95330 <br /> Dear Sir, <br /> The use of PVC or CPVC piping for the purpose of monitoring Xerxes brine filled <br /> reservoirs is acceptable. Xerxes uses 30% Calcium Chloride to fill the annular <br /> spaces of our tanks. The following two pages were printed from Harrington <br /> Plastics On-Line Chemical Guide. At 100% concentration PVC is good up to 140 <br /> degrees F and CPVC up to 180 degrees F. <br /> If you have any questions or require any additional information, please contact <br /> me at your convenience. <br /> Regards, <br /> Del Hinkle <br /> Field Service Coordinator, ext. 228 <br /> cc: Jim Anderson <br /> Pete Sokoloff <br /> L. C. Services <br /> 1210 N. TUSTIN AVE., ANAHEIM, CA 92807* PH 714-630-0012 ' FAX 714-632-7133 <br />