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Wm. J. Hunter & Associates2220 Loma Vista Dr <br /> Registered Geologists �`- �"/iC E Sacramento, CA 95825 <br /> Petroleum& Mineral Appraisers , ,- (916) 972-7941 <br /> 3 Q FAX (916) 972-1683 <br /> i March 25, 1994 <br /> Michael Collins, RENS <br /> .' San Joaquin County Health Department <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> Stockton, Ca 95202 <br /> Ref Fogg& _Quarterly Groundwater MonitorIng Report for 814 E <br /> Ch er Way, Stockton. Site Code 1061 <br /> Dear Michael, <br /> I am enclosing a copy of the field report, water analysis, and <br /> gradient map for the above property The work was performed on <br /> February 12 , 1994 by Dei.-Tech Geotechnical Support Services as <br /> directed by my office <br /> The attached map shows the gradients as measured in October, <br /> 1992, (the first one taken after the monitoring wells were <br /> placed, ) plus the four taken in March, June, & October, 1993, and <br /> February, 1994 All five measurements indicate a rather consis- <br /> tent northeasterly gradient. <br /> J <br /> It is interesting to note the changes in levels of contamination <br /> measured in the 3 wells since monitoring began in October, 1992 <br /> That data is summarized below for your information <br /> MN-1 MW-2 MN-3 <br /> Results of all tests are in ug/1. <br /> 14192 3/93 6193 10193 2194 10192 3193 6/93 10/93 2/94 10/92 ;193 6/93 10193 2194 <br /> B NO NO ND ND 0.4 7 0 3.0 NO 38 19 19 0 17.0 13.0 15 8.6 <br /> T NO NO 0.9 2.3 4.8 1.6 1.9 0.7 17 5 4 NO 7.4 7.0 6.2 5 9 <br /> E NO NO NO 0.6 0.5 NO 0.3 NO 11 3.9 NO 0.7 0.7 3.0 2.7 <br /> x NO NO 0.4 1.2 0.3 ND 1.0 0.4 19 3.1 NO 1.3 1.3 2.B 3.3 <br /> TPH6 60 200 ND BL 150 470 500 NO 531 225 550 1200 110 390 700 <br /> The hydraulic gradient has remained quite stable since first mea- <br /> surements were taken in October, 1992 As shown on EXHIBIT A it <br /> is to the east/northeast Based on the data, monitoring well #2 <br /> is downgradient from both the site of the removed UST' s and the <br /> i 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 recorded the lowest levels of BTEX & TPH-G in each of the 5 <br /> sampling periods to date, although it is the closest to the site <br /> of the removed tanks MW-3, which is the farthest from the tank <br /> site, has recorded varying amounts of BTEX, and the highest <br /> levels of TPH-G MW-2, which is more nearly in a downgradient <br /> Position, should be consistently recording the highest levels <br /> However, a review of the above table reveals that is not the <br /> 1 <br />