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v _ _ <br /> RM I <br /> s n <br /> MO WN-MI SIMON <br /> �. ` <br /> 6�! <br /> .4,vp11ed GeoSysdPms 4191-E Power Inn Read,Sacramento, CA 95826 19161452-2901 <br /> •FREMONT •COSTA MESA • SACRAMENTO •HOUSTON <br /> August 19, 1988 <br /> 0803SEPP <br /> AGS Job No. 86091-6 <br /> 41r. Steve Epperson <br /> Beacon Oil Company <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> r Subject: Letter report of quarterly ground--water monitoring at <br /> Beacon Station No. 1-502, 35 North Cherokee Lane, Lodi, <br /> California, <br /> Mr. Epperson: <br /> A geologist from our office v--sited the site referenced above on <br /> June 7, 1988, to purge and sample five grcund-water monitoring <br /> wells. The work was implemented at the request of Beacon Oil <br /> Company as part of our ongoing environmental investigation. <br /> The site is located on the southwest corner of the intersection <br /> of North CherokeeLaneand Elm Street in Lodi, California. The <br /> location of -the station is shown on the Generalized Site Plan, <br /> Plate P-1. Applied GeoSystems previously installed two 2-inch- <br /> diameter and three 4-inch-diameter ground-water monitoring wells <br /> (AGS Report No. 8691-6, dated April 22, 1987) . The locations of <br /> the wells relative to site facilities are depicted on the <br /> Generalized Site Plan, Plate P--2. Previous work, summarized in <br /> our Work Plan (AGS Report No. 8691-6, dazed May 26, 1987) , <br /> indicated that the soil in the area immediately adjacent to and <br /> below the tank cavity, is contaminated with hydrecarbons. Work <br /> conducted at the site-during this -phase included resurveying the <br /> relative elevations of all well casings to allow topographic <br /> torr__?ctions, and installing a new utility box an monitoring well <br /> MW-3 to allow access to the well. <br /> Depth-to-ground-water measurements were taken in the monitoring <br /> wells prior to purging and sampling. Water-level data, <br /> summarized in Table 1, indicate that 1) at the time of <br /> measurement, the ground-water surface in the monitoring wells had <br /> dropped an average of 1.00 foot since the previous sampling event <br /> and 2) the ground-water gradient had retained a southwesterly <br /> orientation (south 19 degrees west) and magnitude (0.33 vertical <br /> --_-_.feet_:per 100-horizontal-fe.et)--:similar--to those-observed-in <br /> -- - - --- - - - ,, - <br /> previous sampling events (Plate P-2) . The data from well MW-5 . <br /> ;l <br />