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E <br /> The flow direction of the groundwater beneath the facility is to the southwest with an average <br /> hydraulic gradient of approximately 00014 feet per foot (ft/ft) The flow direction and gradient <br /> have only slightly changed from the first quarter monitoring event Water table elevations and a <br /> groundwater contour map for June 15, 1996 are depicted as Figure 1 <br /> BRE personnel collected groundwater samples from eight monitoring wells during this field <br /> event Groundwater samples were transported to Centrum Analytical Laboratories, Inc , in <br /> Redlands CA, and analyzed for Total Petroleum Hydrocarbons (TPH) (EPA Method 8015) and <br /> total volatile organic aromatics (TVOA)(EPA Method 8020), including methyl tertiary butyl <br /> ether (MTBE) <br /> Laboratory analysis of the groundwater samples indicated the presence of dissolved phase <br /> gasoline above laboratory method detection limits (MDLs) in seven of the monitoring wells <br /> Concentrations of TPH ranged from below detection limits (MW 1, MW-2, MW-4 through MW- <br /> 8) to 2500 µg/L in wells sampled, and concentrations of TVOA ranged from below detection <br /> limits (MW-8) to 541 µg/L (MW-3) in wells sampled Table 2 presents the analytical testing <br /> data The analytical data is depicted on a site plan as Figure 2 The complete analytical <br /> laboratory reports including chains of custody is included as Appendix C <br /> REC0MMENDATIONS/CONCLUSIONS <br /> BRE recommends that the results of the quarterly sampling event be forwarded to the San <br /> Joaquin Public Health Services for review and comment Based upon the monitoring data <br /> collected during the second quarter, the monitoring events should continue on a quarterly basis <br /> If you have any questions or comments pertaining to this correspondence, please contact the <br /> undersigned at (954) 570-5885 <br /> Sincerely, <br /> BROWN & ROOT ENVIRONMENTAL <br /> Colleen Dalton <br /> Enclosures <br /> Distribution (1) Addressee <br /> (1) Ms Linda Turkatte <br /> San Joaquin Public Health Services Department <br /> Department of Environmental Resources <br /> 304 E Weber <br /> 0 Stockton, CA 95202 <br />