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ti <br /> 27 October 2004 <br /> AGE-NC Project No 96-0254 <br /> ' Page 10 of 10 <br /> drinking water, however the lateral extent of dissolved MTBE is currently defined by the <br /> ' well network <br /> • MTBE concentrations in the most impacted wells MW-1 and MW-2 have declined <br /> noticeably since Initiation of ground water momtonng Trend analysis suggests that at the <br /> current decay rate, MTBE concentrations in well MW-1 will achieve the state's secondary <br /> maximum contaminant level for drinking water of 5 pg/l by the year 2008 <br /> i • AGE calculated the mass of dissolved MTBE remaining in ground water at 1 7289 lbs or <br /> 0 27 gallons <br /> • An area reconnaissance was conducted by an AGE representative in April 2000 Identified <br /> domestic, municipal, and commercial wells were located greater than 1,700 feet from the <br /> ' site, well beyond the extent of the contaminant plume <br /> • The nearest surface water feature to the site is the Stanislaus River approximately five miles <br /> south of the site It is very unlikely that impacted ground water at the site represents a <br /> significant pollution threat to water in the Stanislaus River, based upon the distance and <br /> direction of the Stanislaus River from the site <br /> Ir <br /> 9 0. RECOMMENDATIONS <br /> ' Based upon petroleum hydrocarbon distribution patterns and migration pathways identified in the <br /> site conceptual model, AGE recommends <br /> ' Preparation of site closure reports,based on the lateral definition of the MTBE plume, the <br /> small mass of dissolved MTBE remaining in ground water,and the possibility achieving the <br /> state MCL for dnnkmg water by year 2008 or sooner on the basis of trend analysis <br /> ' 100. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> ' environmental consultants practicing in this or similar localities The findings were based on <br /> analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points(i a monitoring wells,soil borings and samples)and subsurface conditions may <br /> vary away from these data points No other warranty, expressed or implied, is made as to the <br /> ' professional interpretations, opinions and recommendations contained in this report <br /> ' Advanced GeoEnviron mental,Inc <br />