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i <br /> i U L 10 1992 <br /> Ultramar kNV1R0rAMLN;TAL HEALTH <br /> Ultra-mar Inc. Telecopy: 209-584-6113 Credit&Wholesale <br /> P.O.Box 466 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford. CA 93232-0466 209-583-3358 Accounting <br /> (209)582-0241 <br /> July 7, 1992 <br /> Ms. Harlin Knoll <br /> San Joaquin County Local Health District <br /> Environmental Health Division <br /> P.O. Sox 2009 <br /> Stockton, California 95201 <br /> SUBJECT: QUARTERLY GROUND-WATER MONITORING REPORT FOR THE SECOND <br /> QUARTER 1992, BEACON STATION NO. 502, LODI . CALIFORNIA <br /> Dear Mr. Knoll : <br /> This report presents the results of the quarterly ground-water monitoring <br /> for the second quarter 1992 at the above-referenced site. The site is <br /> located at 35 North Cherokee Lane, Lodi , California (Figure 1) . The <br /> . quarterly monitoring program included depth-to-water measurements, <br /> subjective evaluation for the presence of hydrocarbons, and ground-water <br /> sampling in (3) three ground-water monitoring wells (MW-3 through MW-5) at <br /> the site (Figure 2) . MW-1 and MW-2 were dry and were not sampled. After <br /> purging, samples were collected from all three wells and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPH-g) and benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) . These activities were performed <br /> on May 20, 1992, following the attached field protocol (Appendix) . <br /> RESULTS <br /> The most recent ground-water data along with past data are included in <br /> Table 1 . Data in Table 1 indicates that the ground-water surface <br /> elevation dropped an average of 4.25 feet between March 19, 1990 and May <br /> 20, 1992. The ground-water contours were evaluated from the <br /> depth-to-water measurements and wellhead elevation data. The ground-water <br /> flow direction is interpreted from the contours to be toward the southeast <br /> on May 20, 1992 with an approximate gradient of 0.012 ft/ft (Figure 3) . <br /> Subjective analyses of water in the wells indicated that no wells <br /> exhibited any free floating hydrocarbons or hydrocarbon odor. Cumulative <br /> subjective analyses are also presented in Table 1. Field notes from this <br /> latest monitoring event are included in the appendix to this report. <br /> BEACON <br /> #1 Quality and serNicc <br /> A Member of the Ultramar Group of Companies <br />