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Wm. J. Hunter & Associates2220Loma Vista Dr <br /> Y591:111EU <br /> Registered Geologists Sacramento, CA 95825 <br /> Petroleum& Mineral Appraisers (916) 972-7941 <br /> JAN 1 A 191;5 FAX (916) 972-1683 <br /> January 6, 1995 <br /> ENVIRONMENTAL HEALTH <br /> Linda Turkatte, RENS PERMITISERVICES <br /> rt San Joaquin Co. PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> ' Stockton, CA 95202 <br /> Ref= QUARTERLY GROUNDWATER MONITORING REPORT and REQUEST FOR SITE <br /> CLOSURE: 2969 Loomis Road (Site Code 2015) <br /> Dear Ms. Turkatte, <br /> We have enclosed a copy of the field log, chain of custody form, <br /> and laboratory analyzes of water samples taken from all three <br /> monitoring wells on November 21, 1994. The work was done by Del- <br /> Tech Geotechnical Services as instructed by our office. There <br /> have been a total of 13 sampling events since initiation of the <br /> project in April, 1992; a total of 25 water level measurements <br /> have been made during the same period_ The results of laboratory <br /> analyzes of all water samples taken are summarized on TABLE 1 . <br /> That table reveals that monitoring wells #2 & #3 have never shown <br /> any BTEX or TPH-D since sampling began. Benzene has only been <br /> measured in MW-1 in the June & September, 1993, & the January <br /> 1994 event; xylene was detected in that well only in the June, <br /> 1993 sampling. Toluene & Ethylbenzene have never been detected <br /> in MW-1 since sampling began. <br /> The hydraulic gradient as measured on November 21, 1994 is shown <br /> on EXHIBIT A; it is to the north-northwest EXHIBIT B shows the <br /> directions of all of the 25 water level measurements taken since <br /> the beginning of the project. 13 show a gradient in a southerly <br /> direction; 8 are to the north, 2 are to the east, and 2 are to <br /> the west. <br /> The average depth to groundwater as measured in 1994 is 70. 86' <br /> bgl; -with a maximum change in levels of 2. 98' occurring between <br /> the 5/17/94 & 10/26/94 samplings. Since monitoring began, there <br /> has been a maximum average difference in groundwater elevations <br /> of 4 62' . <br /> C CONCLUSIONS: <br /> r <br /> Based upon all of the data collected to date, the following <br /> conclusions appear to be valid: <br /> 1 The 25 groundwater level measurements taken to date continue <br /> to show a divergent gradient, with no definite pattern. This is <br /> ;0 <br /> 1 <br />