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GROUNDWATER MONITORING REPORT <br /> USA PETROLEUM- STOCKTON#110 <br /> JULY, 1995 <br /> ' Total lead was detected at a concentration of 12 ppb in MW-3-P Groundwater laboratory <br /> results for September, 1992, September, 1993, March, August, and December, 1994, and March, <br /> 1995 are summarized to Table 3, certified laboratory reports and COC documents for the most <br /> ' recent sampling event are included in Appendix B Only MW-3-P had any detectable levels of <br /> total xylenes The reported concentration in MW-3-P was 0 66 ppb <br /> ' 3.2 Groundwater Conditions <br /> Recent groundwater data collected at the site mdicate groundwater occumng at depths ranging <br /> ' from 70 91-feet to 71 58-feet below ground surface (bgs) The groundwater elevation ranges <br /> from a high of 45 52 -feet below MSL to a low of 46 13-feet below MSL Groundwater is <br /> flowing to the north-northeast with a hydraulic gradient of approximately 0 0056Graphic <br /> ' presentations of the flow beneath the site are presented on Figure 3 <br /> The field data and subsequent flow direction calculations suggests that the groundwater generally <br /> ' flows to the east but has fluctuated slightly north and south several times during the year <br /> 1 <br /> r <br />