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Wm. J. Hunter & Associates w !; t`,3-I i 2220 Loma Vista Dr. R Registered Geologists �`_ Sacramento, CA 95825 Petroleum& Mineral Appraisers (916) 972-7941 1: 04 FAX (916) 972-1683 July 8, 1994 Linda Turkatte, REBS San Joaquin Co. PHS Environmental Health Division 445 No. San Joaquin Street Stockton, CA 95202 Ref: 2969 Loomis Road (Site Code 2015; ) Quarterly Report, monitoring well data Dear Ms. Turkatte; We have enclosed a copy of the field log, chain of custody form, and laboratory analyzes of water samples taken from all three monitoring wells on May 17, 1994. The last time that all three wells were sampled was in May, 1992, although water level measurements have been taken monthly since May, 1993. Because there has been a constant decrease in the levels of contaminants detected in MW 01, we decided to test all three wells again to confirm that fact. As you can see from the attached laboratory reports, all wells were below detection limits for BTEX & TPH-G. The results of all analyzes are summarized on TABS I for your information_ A review of water level measurements since the last sampling in January, 1994, reveals a constant rise in the water table since that time - an average of 1.72' . This is the highest level recorded since measurements began in April, 1992. We have also included a map showing the directions of hydraulic gradients measured since monitoring began. They are labeled on the attached EXHIBIT A, The data continues to show a variable gradient with no consistent direction of flow. CONCLUSIONS: Based upon the results of the data obtained to date, the following conclusions appear to be warranted: 1. The 20 water table measurements taken over a period of 2 years shows that there is no consistent hydraulic gradient at this location. 2. All three wells have been in down-gradient positions at various times during the past two years. 3. Levels of contamination measured beneath the property have 1