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1" 14 i t HFET,r, ',,F E=I HL I`7 TEL t d0:4157 . ,r �-!ST F'�� <br /> � �, <br /> t ' <br /> SAFETY SPECIALISTS, Inc. P.0 8ox 4420 Santa Clara, GA X5054 <br /> l hrF ;i Srrv+cC 6nYlrJnnlCAln1 nca+i'+d Salu+v vCrLOi ai+nn <br /> Telephone (408) 988-1111 <br /> Contvactor's LiCensR No 4601905 <br /> April 27, 1990 <br /> Mr. Ken Vanderglift <br /> Precision Industries <br /> 1041 Pershing Avenue <br /> Stockton, CA 95206 <br /> Reference: Safety Specialists, Inc. , Project Number 510330 <br /> Dear Ken: <br /> We were glad to be of assistance on the caustic tank removal at San Joaquin <br /> Delta College in Stockton, California. Our services entailed removing all <br /> liquid caustic and storing in holding tanks. Steaming the underground tank <br /> to liquefy any crystalline caustic and flushing the tank with water were <br /> the next steps before removing this effluent into holding tanks. <br /> Final <br /> stage of services was to neutralize tank and all piping t <br /> bisulfate solution thereby making the tank pH balanced. Test results <br /> confirmed this pH level at 10.5 (see enclosed analysis results) by Chroma <br /> Labs of San Ramon, California. <br /> As expressed earlier, caution needs to be exercised in all handling of this <br /> tank as it has a badly torn lining. Because of this condition, caustic <br /> will continue to weep from behind the lining. To offset this problem <br /> during handling and shipping, we retained a one-gallon pH5 solution in the <br /> tank to react with this caustic as it may possibly be released. Please <br /> advise the recycling site that will be handling the tank of these necessary <br /> precautions. We trust this will accommodate you in your project. <br /> Sincerely yours, <br /> SAFETY SPECIALISTS, INC. <br /> Cornell H. Unzner <br /> Field Supervisor <br /> CHU:fd <br />