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Groundwater samples were collected from the five monitor wells on November 19, 1992 and submitted for laboratory analysis The analytical results indicated that no detectable concentrations of TPH were present in the groundwater samples collected from the five monitor wells at the site Concentrations of benzene were detected in groundwater samples collected from monitor wells MW2, MW3 and MW4 at 0.58 micrograms per liter (µg11), 7 7 µg/1 and 18 µg11, respectively Toluene and ethylbenzene were detected only in the groundwater sample collected from well MW4 at a concentration of 1.2 µg/l, respectively Xylenes were detected in groundwater samples collected from MW3 and MW4 at concentrations of 1 2 µg11 and 13 5 µg11, respectively Groundwater samples were collected from the five monitor wells on June 4, 1993 and submitted for laboratory analysis The analytical results indicated that detectable concentrations of TPH as gasoline were present in the groundwater samples collected from monitor well MW 1 and MW4 at concentrations of 0 69 All and 0 84 µll, respectively Concentrations of benzene were detected in groundwater samples collected from monitor wells MW2, MW3 and MW4 at concentrations of 9 5 All, 78 All and 430 All, respectively Toluene and ethylbenzene were ! detected in groundwater sample collected from MW 1 at 6.0 All and 1 1 All, respectively, and ethylbenzene was detected in MW2 and MW4 at concentrations of 0 92 All and 20 µl1, respectively Xylenes were detected in groundwater samples collected from MWl, MW2 and MW4 at concentrations of 1 1 All, 6 9 All and 91 All, respectively. This report presents the results of the September 1993 quarterly groundwater monitoring event conducted at the property, the second groundwater sampling event performed at the property This work was conducted in accordance with the State Water Resources Control Board Leaking Underground Fuel Tank (LUFT) and Regional Water Quality Control Board (RWQCB) guidelines for the preliminary evaluation and investigation of underground tank sites Groundwater samples were not collected following the November 1992 sampling event until June 1993 Quarterly sampling has continued at three month intervals (i e , September, December) since June 1993 2.0 WATER LEVEL MEASUREMENTS Water surface elevation data were obtained from the monitoring wells at the subject site on September 3, 1993 Water surface elevation data are presented in Table 1 Contours of equal water surface elevation developed from the data are presented in the Potentiometnc Surface Map included as Figure 2 Sample event data sheets are included as Appendix I Groundwater elevations measured September 3, 1993 were approximately three to five tenths of a foot lower than when last measured on June 4, 1993 Groundwater at the site on September 3, 1993 was determined to flow to the northeast 09201cd1 3