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J <br /> Mr. Thomas Hendrix <br /> Page Two <br /> November 25, 1991 <br /> In general, the results of soil and groundwater sampling and chemical testing <br /> from the Kleinfelder boring and monitoring well indicate the presence of Total <br /> Petroleum Hydrocarbons, Benzene, Toluene, Ethylbenzene and Xylene at varying <br /> concentrations.Tests on soil samples revealed hydrocarbon detections as deep as 40 feet <br /> in the test boring. In general, soils exhibited lower hydrocarbon concentrations with <br /> greater depth. Benzene concentrations in groundwater range from an initial level of <br /> 0.382 mg/l (April 1986), to 0.350 mg/l in May/June 1988, and "Not Detected" (less than <br /> 0.0(05 mgA) in July 1991. Toluene was present in all three tests of groundwater at <br /> concentrations of 0.115 mg11, 0.012 mg/l and 0.0043 mg/l, respectively. <br /> Groundwater in the Site area is reported to flow towards the southwest according <br /> to local water district information (Fall, 1989), Several wells exist in the Site area as <br /> observed in a brief reconnaissance of the Munford Avenue area. Some wells were <br /> fo,ind and plotted on the sketch map in Figure 2. No details regarding well depth, <br /> construction or other data were available on the welly at this time. <br /> RECO"V'1%'_ENDED WORK PLAN <br /> This letter report and recommendations for additional work is prepared in <br /> acrordancr with the County's letter request to Thomas E. Hendrix dated September 11, <br /> Rccause of the low concentrations of fuel-related components in the tests results, <br /> ,additional groundwater sampling and analysis on a quarterly basis fox Oric year is <br /> recommended. At the same time, a more detailed survey of graundwajer cCtT'd ions in <br /> the "etc area will be completed. Sampling and chemical testing of water fr,�m it <br /> wells near clected <br /> the: site will be performed in the first quarter. Currently, the tank arra <br /> mo nrtrirnng 13,01, the "house" well and the neighbors well to the west nrr prc)p()ticd for <br /> `amPfinw and analysts (Vigure 2). Groundwater information atiariahlu fjr)m the local <br /> /ate, cy and local well owners will be collected and reviewed fc)r pt)�sjs,�, ;�e rn <br /> ouna' r gradient and water quality determinations, <br /> Other potential sources of hydrocarbon contaminataar, exist in <br /> `these will he examined and an evaluation of their potential as Off-site <br /> site ,;,rc i <br /> groundwater contaminarion will be made. rte sou.%CS of <br /> 011cv the four quarters of sampling and analysis and the other data are gathered <br /> and evaluated, a report of our findings will be prepared. In that report, addito <br /> ional r <br /> data may be needed to accurately define the site groundwater quality condrtisite <br /> ns. <br /> n <br />