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Wm. J. Hunter & Associates M NTA L IIE4l.Tf1 2220 Loma Vista Dr <br /> Registered Geologists :J VICE Sacramento, CA 95825 <br /> Wetroleum & Mineral Appraisers �� (916) 972-7941 <br /> J` " h � PM 2= 49 FAX (916) 972-1683 <br /> January 7, 1995 <br /> Steven Sasson, Sr. REBS <br /> San Joaquin County Health Department <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> Stockton, Ca 95202 <br /> Ref: Seventh Quarterly Groundwater Monitoring Eeport for $14 E. <br /> Charter Way, Stockton' Site Code 1061 <br /> Dear Mr. Sasson; <br /> We am enclosing a copy of the field report, water analysis, and <br /> gradient map for the above property_ The work was performed on <br /> December 7, 1994 by Del--Tech Geotechnical Support Services as <br /> directed by our office. <br /> The attached EXHIBIT A, shows the contours on the top of the <br /> groundwater during the latest sampling event; EXHIBIT _B <br /> summarizes the eight hydraulic gradients measured to date on the <br /> property. All of the data indicate a rather stable hydraulic <br /> • gradient to the northeast. This is consistent with both regional <br /> data and that measured at the Darpetro site to the northwest of <br /> the Morita property. <br /> EXHIBIT C shows the approximate contours on levels of TPH-G based <br /> on the December 7, 1994 sampling event. We do not have recent <br /> data from the Darpetro project to allow a more thorough mapping <br /> of that constituent. <br /> A summary of all of the laboratory analyzes of water samples <br /> taken since monitoring began in October, 1992, is included as <br /> TABLE I. <br /> Based on the gradient data obtained to date, monitoring well #2 <br /> is downgradxent from both the site of the removed UST' s and the <br /> Pump island_ Wells #1 & #3 are on strike with, (parallel to, ) <br /> the gradient, and a considerable distance from those sites MW-1 <br /> has consistently recorded low levels of BTEX & TPH-G since moni- <br /> toring began, although there have been variations in the amounts <br /> measured. MW-3, which is the farthest from the tank site, has <br /> recorded varying amounts of BTEX and TPH-G, with no consistent <br /> pattern. MW-2, which is in a downgradxent position, has also <br /> recorded varying levels of BTEX & TPH-G Although these readings <br /> are fairly consistent with gradient data, the ongoing activities <br /> associated with the Darpetro investigation nearby may be <br /> .influencing the movement of the groundwater in this area_ <br />• <br />