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Wm. J. Hunter & Associates 2220 Loma vista Dr <br /> Registered Geologists Sacramento, CA 95825 <br /> *Petroieum & Mineral Appraisers DJ1,�� (916) 972-7941 <br /> !!!I GJJJ FAX (916) 972-1683 <br /> September 23, 1994 OCT Q 3 1994 <br /> Harlen Knoll, REHS ENVIRONMENTFaL HEALTH <br /> San Joaquin County PHS pRONM S ITAL HES <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref: FIFTH QUARTERLY GROUNDWATER MONITORING REPORT, 1876 Country <br /> Club Drive, Stockton, Site Code 1844 <br /> Dear Harlen; <br /> We are enclosing the results of the sixth groundwater measure- <br /> ments, sampling & laboratory results done on August 25, 1994, <br /> covering the above property. Included are copies of the field <br /> logs made by Del-Tech, a table summarizing sampling results, <br /> laboratory reports, a site map showing the pieziometric surface <br /> based on the 8/25/94 data, and a map showing directions of all of <br /> the hydraulic gradients measured to date. <br /> A review of the most recent work is discussed below: <br /> ' 1 . The water table was measured at an average depth of 21 . 88' <br /> bgl, (-17. 80' MSL, ) down about 1/2' since the April sampling_ <br /> The maximum change in elevation has been about 1 . 5' since mon- <br /> itoring began. <br /> 2. The hydraulic gradient continue, to be in a north--northeast- <br /> erly direction, which corresponds well with the regional gradient <br /> in this area. PLATE I shows the contours on top of the water <br /> table based upon the 8/25/1994 data. The slope appears to have <br /> steepened somewhat compared to prior measurements; the signifi- <br /> cance of that change is not known. The direction is almost <br /> identical to the 11/93 data, (see PLATE II. ) Only the 1/26/94 <br /> data showed a direction slightly to the east of due north, all <br /> the rest have been in the east. There have been no data indica- <br /> ting a westerly gradient. <br /> 3. A summary of all laboratory results of mater samples taken <br /> since monitoring began is shown on TABLE I . That data shows <br /> monitoring well #1 continues to have the highest levels of BTEX & <br /> TPH-G; MW-3 has the second highest, and MW-2 the lowest This <br /> relationship has remained constant since sampling began. <br /> 4 Laboratory analysis revealed that a minor amount of contami- <br /> nation was detected in the bailer blanks from the three wells A <br /> . thorough review of field protocol by Del-Tech dad not indicate <br /> 1 <br />