Laserfiche WebLink
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/1 in May/June 1988, and "Not Detected" (less than <br /> 0:0005 mg/I) in-July"1991:'Toluene"was present in all"thred�tests of-groundwater at­– <br /> concentrations <br /> t—concentrations of 0.115 mg/l, 0.012 mg/l and 0.0043 mg/1, 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 /> found and plotted on the sketch map in Figure 2. No details regarding well depth, <br /> i <br /> construction or other data were available on the wells at this time.. <br /> RECOMMENDED WORK PLAN <br /> This letter report and recommendations for additional work is prepared in <br /> accordance with the County's letter request to Thomas E. Hendrix dated September 11, j <br /> 1991. <br /> i <br /> Because of the low concentrations of fuel-related components in the tests results, <br /> additional groundwater sampling and analysis on a quarterly basis for one year is <br /> recommended. At the same time, a more detailed survey of groundwater conditions in <br /> the site area will be completed. Sampling and chemical testing of water from selected <br />_ . wells near=the site-will,be performed-in the-first-quarter. Currently, ,the .tank-area <br /> monitoring well, the "house" well and the neighbors well to the west are proposed forW, <br /> sampling and analysis (Figure 2). Groundwater information available from the local <br /> water agency and local well owners will be collected and reviewed for possible use in <br /> groundwater gradient and water quality determinations. f <br /> i <br /> Other potential sources of hydrocarbon contamination exist in the site area. <br /> These will be examined and an evaluation of their potential as off-site sources of <br /> groundwater contamination will be made. <br /> Once 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, additional site <br /> data may be needed to accurately define the site groundwater quality conditions. 1 <br /> E <br />