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LEEDSHILL•HERKENHOFF, INC. <br /> ' 303 Second Street,Suite 880 North <br /> San Francisco,California 94107 <br /> 41512439980 <br /> ' August 17, 1988stp�G <br /> gTanst <br /> 6 1988 <br /> Jeanne M. Zol ezzi 2 �LTH <br /> 509NeumW11WeberBAve. , Fifth Floor 0,q R Mee T�S_RV ES <br /> ' Stockton, CA 95201-9978 V <br /> 06 <br /> Re: Lincoln Properties Ltd./Groundwater File No. 52640-13360 <br /> ' Dear Ms. Zolezzi : <br /> Enclosed are copies of Leedshill-Herkenhoff's (LH) Groundwater Investigation <br /> at Lincoln Village Center, Stockton, CA, including Appendices. This inves- <br /> tigation was performed per the work plan approved by the Regional Water <br /> Quality Control Board and San Joaquin County Local Health Department. <br /> The results of this investigation indicate that the upper water bearing zone <br /> ' is contaminated with PCE and TCE, which appears to have leaked through <br /> joints in the existing sewer line and migrated to the water table. The <br /> Tocation of this contamination is probably centered near MW #4 and LVMD #1 . <br /> The direction of flow in the upper water bearing zone is generally easterly <br /> ' to northeasterly, and there are no downgradient domestic wells within one <br /> mile of the site. Monitoring wells #1, #2 and #3 did not have detectable <br /> PCE or TCE contamination. A sample collected by the RWQCB in January 1987 <br /> from the Chevron monitoring well located 900 feet downgradient from LVMD #1, <br /> showed no detectable concentrations of PCE or TICE. Based on relatively <br /> limited data, the contamination also appears to be isolated in the upper <br /> water bearing zone, which appears hydraulically separate from the deeper <br /> ' aquifer. <br /> Samples collected from beneath the concrete floor slabs and from the sewers <br /> ' serving the three dry cleaning establishments showed detectable PCE and/or <br /> TCE concentrations. <br /> It has been a please working with you on this project. If you require <br /> additional information please do no to contact Cynthia Wetmore or <br /> me. QRO S/p� <br /> v10 S• N9�l F2 <br /> ' Very truly yours, 4, <br /> � = <v 2 a <br /> U 0 4kk TYo.�29524y�� <br /> ' Gerry S. Nakano / <br /> Project Engineer sT ��. <br /> 4 OF CA01* <br /> cc: Mr. Wilbur H. Smith, II, Lincoln Properties Ltd. <br /> ' SAN FRANCISCO • SAN DIEGO • DENVER • ALBUQUERQUE SANTA FE PHOENIX <br />