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LStantec <br /> SECOND QUARTER 2008 GROUNDWATER MONITORING REPORT <br /> Discussion and Recommendations <br /> L July 7,2008 <br /> L 5.0 Discussion and Recommendations <br /> LGroundwater elevations in Site wells decreased an average of 4.36 feet between February 2008 <br /> and May 2008. The groundwater flow direction and gradient based on groundwater elevations <br /> Lmeasured in May 2008 is towards the south at a gradient of 0.0037 ft/ft. Based on data <br /> collected during the four groundwater monitoring events performed to date, groundwater flow <br /> direction beneath the Site is variable. Given the flat potentiometric gradient beneath the area of <br /> Linvestigation, small changes in groundwater elevation and measurement accuracy can <br /> significantly affect the interpreted flow direction. <br /> LDiesel- and gasoline-range petroleum hydrocarbons were initially reported in well MW-1 in May <br /> 2007 at a concentration of 850 pg/L and decreased to 150 pg/L in February 2008.. THPd and <br /> TPHg were not detected in well MW-1 above the reporting limit of 50 ug/L in May 2008. TPHd <br /> was reported at a concentration of 98 ug/L in well MW-2 in May 2008, representing the first time <br /> petroleum hydrocarbon constituents have been reported in well MW-2. Stantec recommends an <br /> additional quarterly groundwater monitoring event to evaluate chemical concentration trends in <br /> wells MW-1 and MW-2, and also to further evaluate groundwater flow patterns in the vicinity of <br /> the former ASTs. <br /> L <br /> C <br /> c <br /> is iApg&e\french camp\groundwater monitoring\may 2008 monitoring\gmr rpt_fnl.doc 5.1 <br />