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Former Manna Pro Site Page 7 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 207 2 <br /> . 12 November 1999 <br />' 4.0 DISCUSSION <br />' 4.1 Discussion of Data <br /> Field and analytical data results are summarized in Summary Table 1 and <br /> illustrated in Figures 3 through 5 <br />' The map of groundwater gradient (Figure 3) suggests that the flow of <br /> groundwater is to the northeast The water table has fallen over three feet since <br /> the monitoring event in June of this year The groundwater surface in the <br />' vicinity of MW-3 and MW-5 is substantially depressed relative to other nearby <br /> wells There are several possible explanations as to the cause of the depression, <br /> but at this time, the cause is not known <br />' The analytic data suggest that contaminant levels are generally consistent with <br />' what has been observed in past monitoring events Two anomalies of note <br /> concern the analytical results of samples from MW-9 and MW-10 The MW-9 <br /> sample contained low levels of gasoline range hydrocarbons and BTEX <br />�. compounds The TPH level of 379 ppb is greater than has ever been observed in <br /> the past The sample from MW- 10 contained 316 ppb of gasoline range <br /> hydrocarbons The laboratory noted that the chromatogram for this sample did <br /> not conform to a normal gasoline pattern, however, and no BTEX compounds <br /> were detected We suggest this reading is anomalous and is not related to the <br /> gasoline release <br /> The samples were tested for the presence of 5 oxygenated gasoline additives <br /> including MTBE No detectable levels of these oxygenates were found in the <br /> samples The chlorinated organic compound, DCA was detected in the sample <br /> from MW-1 <br />' 4.2 Future Work Schedule <br />' Based on the data collected during the course of this investigation, Geo-Phase <br /> Environmental Inc anticipates the following work will be completed in the <br /> future <br /> Quarterly groundwater monitoring and sampling should continue The San <br /> Joaquin County PHS/EHD has approved a Work Plan to conduct additional site <br /> characterization of the deeper groundwater and to complete pilot level testing of <br /> several remedial technologies The estimated costs associated with this work <br />' 2937 Venernan Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />