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ICL ry Ii Hpr 9::, 10 U3 NO . Uzi r . U� <br /> STATE OF CALIFORNIA—EN9u+ONMENTAL PROTE(. N AGENCY * PETE WILSON,Govsnvr t <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION gg <br /> 3443 ROUTIER ROAD,SUITE A i p <br /> SACRAMENTO.CA 95827-3098 <br /> PHONE: (918)255-3000 <br /> FAX (918)255-3015 <br /> 19 April 1995 <br /> Mr. Terre Bonham, P.E. <br /> ENiCON <br /> 1433 North Market boulevard <br /> Sacramento, CA 95834-1943 <br /> STOCKTON TERMINAL TEC'HNIC'AL COMMITTEE FACILITIES: WORKPLAN <br /> FOR PIF,ZOMETER AND WELL DECOMMISSIONING AND REPAC.'EMENT OF <br /> SPECIFIED MONITORING WELLS, STOCKTON (SAN JOAQUIN COUNTY) <br /> Staff has reviewed the subject workplan and concurs with the proposed actions. This letter <br /> confirms our telephone conversation on 19 April 1995. As stated in that conversation, please <br /> inform us at least three working days in advance of scheduled field activities so that we may be <br /> present if desired. When the work is completed, please submit as-built records of replacement <br /> wells and a summary/discussion of any problems encountered during the decommissioning and <br /> replacement work. Hydrocarbon analyses performed on the cuttings shall be, as we discussed, <br /> consistent with methods presently used during routine monitoring work at (his facility and in <br /> conformance with the Tri-Regional Board Stuff Recommendations for Prehrninary Investigation <br /> and Evahunion of Underground Tank Sites((he "Tri-Regional Guidelirres"). We recommend that <br /> TPH•g and TP11-d be characterized by GCFID - fused capillary colunut methods and extracted by, <br /> respectively,purge-and-trap techniques(for volatile components. i.e.,gasoline) or sonication <br /> techniques (,for extractibles, i.e., diesel). <br /> Please inform us of the manner of disposal of the cuttings after the analytical results are reviewed. <br /> It you have any questions,please call me at (916)-255-3119. <br /> GAIL WIGGLTT, C.F.G. <br /> Associate Engineering Geologist <br /> Waste Discharge to Ljnd Unit <br /> Land Dischwge Section <br /> (AW: gw <br />