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1 <br /> . FIRST QUARTER,2000 <br /> GROUNDWATER MONITORING REPORT <br /> ' USA STATION#110-STOCKTON <br /> MAY,2000 <br /> Groundwater elevation data from the January 13, 2000 measurements indicate groundwater was <br /> flowmg to the east-southeast at a hydraulic gradient of approximately 0 0016-feet/feet at the tune <br /> of this gauging event A review of the historical field data suggests that the groundwater <br /> generally flows to the east with minor fluctuations to the north and south, as shown on Figure 5 <br /> 3.2 Results of Groundwater Laboratory Analysis <br /> 1 All petroleum compounds were non-detect (ND) at the method detection limit m MW 1-P, MW- <br /> 5-P, MW-6-P and MW-2 for this sampling event. TPH G was reported in monitoring wells MW- <br /> 1, MW-2-P, MW-3-P, and MW-4-P at 160, 560, 150, and 100 micrograms per liter ( µg/l), <br /> respectively Benzene was detected in only one well this quarter,M W 2-P at 4 0,ug/1 Toluene <br /> was reported in MW-1, MW-2-P,MW-3-P, and MW-4-P at 7 4, 6 2, 5 9, and 0 56µg/1, <br /> respectively Ethylbenzene and xylenes were both ND in all wells this quarter, except MW-4-P <br /> where they were detected at 0 60 and 0 99,ug/l,respectively. MTBE was also ND in all wells, <br /> 1 except MW-3-P where it was detected at 25 µg/1. The groundwater analytical results for this <br /> sampling event are summarized in Table 2, and shown on Figure 6 Copies of laboratory reports <br /> with COC documentation are included in Appendix B <br /> 3.3 Schedule <br /> 1 The second quarter sampling event for 2000 was conducted the week of April 17, 2000 and the <br /> monitoring report will be submitted by July 15, 2000 <br /> 1 <br />' 3 <br />