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Wm. J. Hunter & Associates I-T{1 2220 Loma Vista Dr <br /> Registered Geologists Sacramento, CA 95825 <br /> Petroleum& Mineral Appraisers (916) 972-7941 <br /> 2; 2 8 FAX (916) 972-1683 <br /> September 21 , 1994 <br /> Michael Collins, REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref : FOURTH QUARTERLY. GROUNDWATER MONITORING REPORT- <br /> 1500 Shaw Road, Stockton, CA, (Site Code 1727) <br /> Dear Michael ; <br /> We are enclosing the results of the fourth quarterly report <br /> covering groundwater monitoring activities at the above site, <br /> which were performed on August 1 , 1994. Copies of the field <br /> logs, water measurement data, chain of custody and laboratory <br /> reports are included. The results of all of the laboratory <br /> results taken since monitoring began are summarized on TABLE 1 <br /> for your convenience. <br /> This is the fifth sampling and testing since completion of the <br /> four monitoring wells in May, 1993. The results of the newly <br /> completed wells will be discussed in the report covering that <br /> activity; it will be forwarded to your office when completed. <br /> The following observations concerning the monitoring activities <br /> to date are offered for your information. <br /> 1 . The water table table has risen an average of 3 85' since the <br /> June measurement, and is at the highest level recorded since <br /> monitoring began in June, 1993. It has risen over 8 feet since <br /> the lowest levels recorded in January, 1994 . <br /> 2 The hydraulic gradient as measured in the four wells is to <br /> the south at about 7. 5'/mile. The direction has not changed <br /> significantly since the first readings in June, 1993. EXHIBIT A <br /> shows the contours on the current pieziometric surface, together <br /> with the gradients as indicated by previous data. <br /> 3 Laboratory results of all samplings done since the start of <br /> monitoring operations are tabulated on TABLE I . 15L-3, directly <br /> downgradient from the site of the removed UST, has consistently <br /> recorded the highest levels of BTEX & TPH-G. MW-4 is the closest <br /> to, and on strike with, the tank site. Levels of contamination <br /> have generally decreased with time. MW-2, which is slightly <br /> downgradient from the tank site, has also had a general decrease <br /> in levels since monitoring began. <br /> MW-1 , which is in an upgradient position, should be recording the <br /> 1 <br />