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i • <br /> LEEDSHILL•HERKENHOFF, INC. <br /> 303 Second Street, Suite 880 North \a <br /> San Francisco, California 94107 ,y,p,,• L ""' <br /> 41512439980 <br /> August 14, 1989 <br /> Ms. Laurie Cotulla G� °1 J���S a GEPjH <br /> Public Health Services, San Joaquin County <br /> C. <br /> 1601 East Hazelton Avenue <br /> P.O. Box 2009 <br /> Stockton, CA 95205 <br /> Re: Lincoln Village Center, Phase II Workplan, Stockton <br /> Dear Ms. Cotulla: <br /> LEEDSHILL-HERKENHOFF, INC. (LH) is pleased to submit for your review and approval <br /> our Phase II Workplan for the Lincoln Village Center groundwater contamination <br /> site assessment. This Phase II investigation is planned to further define the <br /> lateral extent of PCE groundwater contamination and to further examine the <br /> suspected soil contamination around the on-site sewer lines. Any additional <br /> work which may be deemed necessary pending results from this proposed Phase II <br /> work will be completed as mutually agreed upon in subsequent phases. As <br /> previously agreed upon with the Regional Water Quality Control Board (RWQCB), <br /> only PCE contamination will be investigated. <br /> Enclosed is a copy of the review memorandum from the RWQCB. The memorandum <br /> states that LH's Phase II Workplan appears sufficient to meet the stated <br /> objectives of the investigation. The RWQCB did request two minor clarifications <br /> regarding monitoring well construction and installation. In response to these <br /> requests, LH has contacted the RWQCB and clarified that it will continuously <br /> monitor drill cuttings during well installation, taking discrete split-spoon soil <br /> samples every five feet or at formation changes. The bentonite seal placed above <br /> the sand pack during well construction will be one foot thick, followed by a <br /> cement grout seal to the surface. <br /> Enclosed is the fee of $35 to cover the costs of your review. Please notify <br /> either Mike Tognolini or me at 415/243-9980 if you have any questions or require <br /> additional information. <br /> Very truly yours, <br /> Gerry S. Nakano <br /> Project Manager <br /> Enclosures <br /> cc: Jeanne Zolezzi <br /> Wil Smith <br /> 9811 .hd/293 <br /> SAN FRANCISCO • SAN DIEGO • DENVER ALBUQUERQUE SANTA FE • PHOENIX <br />