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F <br /> �I <br />' The flow direction of the groundwater beneath the facility is to the northwest with an average <br /> hydraulic gradient of approximately 0 0013 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 17, 1996 are depicted as Figure 1 <br /> BRE personnel collected groundwater samples from eight monitonng 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 three of the monitoring wells <br /> Concentrations of TPH ranged from below detection limits ( 4W-3, MW-4, MW-6 through <br /> MW-8) to 6800 gg/L in wells sampled, and concentrations of TVOA ranged from below <br /> detection limits (MW-3, MW-4, MW-6 through MW-8) to 1630 µg/L (MW-5) in wells sampled <br /> Table 2 presents the analytical testing data The analytical data is depicted on a site plan as <br /> Figure 2 The complete analytical laboratory reports including chains of custody is included as <br /> Appendix C <br /> RECOMMENDATIONS/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 /> I <br /> I I r lI <br /> Enclosures <br /> I I <br /> Distribution (1) Addressee <br /> (1) Ms Linda Turkatte <br /> I I San Joaquin Public Health Services Department <br /> Department of Environmental Resources I r <br /> 1` I 304 E Weber ; <br /> I' Stockton; ICA' 95202 ' <br /> r,i r <br /> I <br /> I' 1 <br /> r I I Ill f" YID II SII I I I I,, 1 1 II 11 ,'l Il d1111 II r EII r ''l1,� r'I "II r f4 III l'' Vl,, 'Ir ,II I�I III I'I' I Y I 1 0 q <br />