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n A jr <br /> t !r ASJU <br /> [ <br /> 117 1ji, <br /> Wm- I Hunter & Associates 2220 Loma Vista Dr <br /> Registered Geologists ''" j ��_ P <br /> P 3 9 Sacramento, CA 95825 <br /> etroleum 8 Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> March 3, 1995 <br /> Michael Infurna, Sr. REHS <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> 445 No. San Joaquin Street <br /> Stockton, CA 95202 <br /> Ref= FIFTH -Q-U_ARTERLY GROUNDWATER MONITORING REPORT- <br /> 1500 Shaw Road, Stockton, CA, (Site Code 1727) <br /> Dear Michael; <br /> We are enclosing the results of the fifth quarterly report <br /> covering groundwater monitoring activities at the above site, <br /> which were performed on December 13, 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 I <br /> for Your convenience. - <br /> This is the sixth sampling and testing since completion of the <br /> four monitoring wells in May, 1993, and the second sampling of <br /> the three new wells placed in August, 1994. Details of the newly <br /> completed wells were covered in the report titled "INTERUM <br /> ASSESSMENT REPORT AND RESULTS OF GROUNDWATER INVESTIGATION" dated <br /> October 2, 1994. <br /> The following observations concerning the monitoring activities <br /> to date are offered for your information. <br /> I . The water table table has dropped an average of 2. 55' since <br /> the August measurements, to an average depth of 68. 91 ' bgl ; <br /> (-42. 27' msl datum. ) <br /> 2. The hydraulic gradient as measured in the seven 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. 6W-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 /> 1 <br />