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STATE OF CALIFORNIA-Environmental Protech .,gency PETE WILSON Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRALVALLEY REGION or <br /> 3443 Routter Road,Sufte A <br /> Sacramento,CA 95827-3098 <br /> PHONE:(918)255-3000 �►�d� <br /> FAX(918)255-3015 <br /> o Cat . . <br /> 10 April 1995 <br /> Mr. Ernest Lee <br /> Pacific Gas and Electric Company <br /> 375 North Wiget Lane, Suite 250 APR 1 1 1�5 <br /> Walnut Creek, CA 94598-2412 <br /> Fni\'I�r`^1�471\T, uEALTH <br /> REQUEST FOR REVISED WORK PLAN, PACIFIC GAS AND ELECTRIC COMPANY, <br /> LATHROP GAS DEHYDRATOR STATION, SAN JOA QUIN COUNTY <br /> We have reviewed the 10 March 1995 work plan entitled Work Plan for Ground Water Investigation, <br /> Lathrop Gas Dehydrator Station, San Joaquin County, California, prepared by Technical and <br /> Ecological Services (TES) for the next phase of remedial investigation(Phase III) 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, include the need for the following changes to the work plan: <br /> 1. Revision/clarification 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 necessary to adequately define the full lateral and vertical extent of soil 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 needs may be deferred to the next phase of <br /> investigation. In addition, we recommend that you now proceed with efforts to gain access to the <br /> property adjacent to the site so that installation of the proposed offsite 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 work plan, which <br /> adequately addresses our comments, and a time schedule for implementing the current phase of <br /> remedial investigation at the Lathrop facility. <br /> If you have any questions, please call John Moody at (916) 255-3141. <br /> pj� /a7 i-L, <br /> WENDY L. COHEN <br /> Senior Engineer <br /> JDM:jdm/Isb <br /> Enclosure <br /> cc: Ms. Linda Turkette, San Joaquin County Department of Public Health Services. Stockton <br />