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Wm. J. Hunter & Associates 2220 Loma Vista Dr <br /> Registered Geologists Sacramento, CA 95825 <br /> eetroleum & Mineral Appraisers I (916) 972-7941 <br /> FAX (916) 972-1683 <br /> April 18, 1995 APR 2 0 1995 <br /> Marc Paschini, District Manager ENVIRONMENTAL HEALTH <br /> Canteen Corp PERMITJSERVICES <br /> 1500 Shaw Road <br /> Stockton, CA 95215 <br /> Ref Monitoring well water depth measurements taken 3/29/1995 <br /> Dear Marc , <br /> I was waiting to give a report covering the above work until I <br /> received the latest lab results, but decided not to wait <br /> On March 29, 1995, Don Light, (Del-Tech Geotechnical Services , ) <br /> determined the depth to groundwater in the four wells on U S <br /> Chemical property and the seven wells on the Canteen site He <br /> used a two-phase interface probe to check levels , measurements <br /> were made at least twice to verify accuracy. Eamon Moriarity of <br /> Harding Lawson Associates verified the measurements, and recorded <br /> the data I also was present to make sure the field procedures <br /> were satisfactory After determining water levels in all of the <br /> wells, Don Light purged and sampled the Canteen wells as needed <br /> for quarterly monitoring requirements <br /> After converting the data to mean sea level (MSL) elevations, I <br /> constructed maps showing lines of equal elevations using that <br /> data PLATES A & B are small scale maps showing both sites, <br /> with two different interpretions of the data PLATES C & D are <br /> of the Canteen site, showing the two interpretations on a larger <br /> scale <br /> Based on the results of this work, the following observations can <br /> be made <br /> 1 The hydraulic gradient measured in all eleven wells is <br /> indicated to be to the south/southeast This agrees very closely <br /> with prior gradient data obtained from the Canteen. Corp wells <br /> 2 Although the data shows the gradient to be steeper on the <br /> Canteen site, there is no apparent disconformity between the two <br /> sets of wells There is no evidence to indicate that the Canteen <br /> wells are separated from those at U S Chemical <br /> 3 Monitoring well #1 in the northwest corner of the U S <br /> Chemical property appears to be in a direct downgradient position <br /> from the site of the removed UST' s MW-2 , to the northeast, is <br /> also downgradient, but not in a direct line <br />• <br /> 1 <br />