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Wm. J. Hunter & Associates 2220 Loma Vista Dr. Registered Geologists Sacramento, CA 95825 *petroleum & Mineral Appraisers (916) 972-7941 FAX (916) 972-1683 May 3 , 1995 , 1 , Steven Sasson, REHS San Joaquin County PHS I,iAY 1995 Environmental Health Division 445 No. San Joaquin Street ENVIRONMENTAL HEALTH Stockton, CA 95202 PERMIT/SERVICES Ref : Fourth Quarterly Groundwater Monitoring Report for 921 W. Fremont Street, Stockton. Dear Mr. Sasson; We have enclosed a copy of the field report, water analysis results, and a gradient map for the above property. The work was performed on March 28, 1995 by Dei-Tech Geotechnical Support Services as directed by our office . The attached PLATE I shows the direction of the groundwater gradient indicated by the five (5) measurements taken to date . The data continues to show the hydraulic gradient is to the north; the 3/28/95 gradient is essentially identical to that measured in December, 1994 . The results of the laboratory anayzes of water samples collected since monitoring began are shown on TABLE I . To date, neither BTEX or TPH-G have been detected in water samples from MW-1 or MW-3 . MW-2 , directly downgradient from the site of the removed UST, stall shows significant levels of BTEX & TPH-G. In fact, the levels have increased since the last measurement, probably due primarily to the rise in water level since that time . The water table has risen slightly over 6 feet since the December measurement . This is consistant with the general rise of water levels in the Stockton area, which is due to the extremely high rainfall this year. ONCLUSIONS : Based upon the data collected to date, the following conclusions appear valid: 1 . MW-1 & MW-3 indicate that the limits of the plume have been defined to the east, south, & west of the UST site . 2 . MW-2 , located in a downgradient position, confirms that the 1