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' 13 August 2003 <br /> AGE-NC Project No 99-0624 <br />' Page 4 of 5 <br /> • Utilizing EPA Method 8260B, MTBE was detected from wells MW-1, MW-2 and MW-3 <br />' at concentrations as high as 9,200,ug/l (MW-2) The MTBE concentrations were above the <br /> Primary MCL of 13 yg/1 in drinking water <br />' • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> well MW-2 Indicate that this well is within or near the dissolved petroleum hydrocarbon <br /> "core area" of the plume, as detected from the current well network on-site (Figure 4) <br />' • Albeit MTBE concentrations decreased between the November 2002 and the March 2003 <br /> ground water monitoring events, the significant MTBE-impacted ground water and the <br /> laboratory notations that all chromatograms from MW-2 ground water samples have <br />' contained significant, unmodified or weakly modified gasoline, should be Interpreted as <br /> Indications of a relatively new release <br /> 5 0. RECOMMENDATIONS <br />' Based upon data collected during March 2003, AGE recommends <br /> lie <br /> Continued quarterly ground water monitoring and sampling, the next quarterly monitoring <br /> event is scheduled for June 2003 <br /> • Performance of a receptor survey to locate potential receptors within 2,000 feet of the site <br />' a Preparation of a feasibility studies report to evaluate soil and ground water remediation <br /> alternatives at the site <br />' A work plan for installation of one ori-site shallow monitoring well one on-site deep well, and one <br />' off-site shallow well was submitted to the SJCEHD on 03 September 2002 and approved by the <br /> SJCEHD by letter on 13 May 2003 Installation of these momtonng well may delineate the lateral <br /> and vertical extent of the dissolved hydrocarbons and fuel additives <br /> 6.0. 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 upon <br />' analytical results provided by an independent laboratory Evaluations of the 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 ground water samples) and subsurface conditions may vary away from <br />' Advanced GeoEnvironmental,Inc <br /> I <br />