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'64/17 '95 11:00 ID:PC-&E _ Sciences FAX:510-866-� PAGE 2 <br /> 03/17/96 09:68 Cr610 748 4232 (.Ir&s We Q002 <br /> NATE OF CALIFORNIA-ErMMWrw)taj PfZt9 gn±jpwY PETE W1t.90N.GOwmol <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION EFL M9 17% <br /> 3443 Roue►Road,fruits A <br /> 8iQWni=,CA OWT-1098 <br /> PHONE'(916)235.000 <br /> FAX(9i 9)255---o 5 <br /> 10 April 1995 <br /> Mr. Ernest Lee <br /> Pad&Gas and FI=tric Company <br /> 375 North Wiget Lane, Suite 250 <br /> Walnut Crean, CA 94598-2112 <br /> REQUEST FOR RE[WISED WORK PLAN, FA C rRC GAS AND EI.ECTPJC COMPANY, <br /> LATHROP GAS DFIYYDRATOR STATION,.SAN JOAQUIN COUNTY <br /> We have ravitwed the 10 March 1995 work plan entitled Work PLwi for Oroumi Walerinvewigaliur; <br /> Lathrop Gas Dehydator S=r^ Save Joaquin County, California,propared by Technical and <br /> Ecological Services(TES)for the next phase of remedial investigation(phase IIl) at PG&E's Lathrop <br /> Gas Dehydrator Station. The work plan was prepared in response to our 5 December 1994 request for <br /> additional remedial investigation of the soil and ground water at the Lathrop facility, Our comments, as <br /> summarized in the enclosed memorandum inc4udc file need for tha following cluwges to the work plan: <br /> 1. Revision/clarif=tion of the coring and sampling program protocols. <br /> 2. Analysis of the soil and ground water for glycol and semi-volatile organic compounds. <br /> 3. Use of gradient information, in addition to soil boring results, in the selection of well locations. <br /> In addition to our comments in the attached memorandum we anticipate that additional soil borings <br /> and monitoring wells will be rneccaswy to adequately&Xwle the full lateral and vertical extent of snit and <br /> ground water contamination, both onsite and offsite. However,in order to expedite the current phase <br /> of the remedial investigation,these additional data nccde may be deferred to the next phase of <br /> investigation. In addition, we recommend that you now proceed with efforts to Scut access to tho <br /> property adjacent to the site so that installation of the proposed offsito monitoring wells will not delay <br /> completion of the proposed remedial investigation. <br /> By 2 May.1995 please submit a revised work plan or a supplement to the existing wark plan, which <br /> adequately addresses our comments, and a time schedule for implementing the currcat phase of <br /> remedial investigation at the Lathrop$ciliry. <br /> If you have any questions, pleasz call John Moody at(916)255-3141. <br /> pw / ,n, <br /> WENDY L. COHEN <br /> Senior Engineer <br /> IDM:jdm/Isb <br /> Enclosure <br /> cc: Ms. Linda Turkcttc, San Joaquin County Department of Public Health Service*. Stockton <br />