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07 January 2000 <br /> AGE-NC Project No 95-0130 <br /> IPage 4 of 5 <br />' • Between the June 1999 and the October 1999 sampling events, a substantial increase in <br /> dissolved MTBE was quantified at VW-3A <br />' • TBA was detected in a water samples collected from well MW-3 and MW-5 at <br /> concentrations as high as 80 ,ug/l Due to historical TBA detection at MW-2 and due to <br /> abnormally high laboratory reporting limits at VW-1 C, VW-2A and VW-3A, TBA may also <br /> be present in the areas of MW-2, VW-1C, VW-2A and VW-3C at concentrations below the <br /> laboratory determined detection limits <br /> • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br />' wells VW-1 C, VW-2A and VW-3A indicate that these wells are within or near the dissolved <br /> petroleum hydrocarbon "core area" of the plume <br /> • The vertical/horizontal extent of impacted soil and ground water has not been delineated <br /> towards the northeast <br /> • The dissolved TPH-g, BTEX and MTBE plume is at least 37 feet thick in the area of wells <br /> MWA, MW-2, MW-3 (screened 60 to 80 feet bsg), MW-5 (screened 50 to 70 feet bsg), VW- <br /> 1C (screened 48 to 63 feet bsg), VW-2A and VW-3A (screened 43 to 63 feet bsg), with <br /> increasing depth, the dissolved petroleum plume grades from higher concentrations to lower <br /> concentrations <br /> 5.0. RECOMMENDATIONS <br /> IBased upon the results of this investigation, AGE recommends <br /> • Continued quarterly ground water monitoring The next quarterly monitoring and sampling <br /> event Is tentatively scheduled for 21 January 2000 <br /> • Continued utilization of wells VW-1, VW-2 and VW-3 for characterization of ground water <br /> conditions in the "core area" <br /> • Proceed with drilling activities upon UST Cleanup pre-approval as outlined in the Wo?k Plan <br />' Addendum -June 1998, dated 23 June 1998 and approved by the PHS-EHD by letter dated <br /> 18 August 1999 Drilling activities are tentatively scheduled for 21 January 2000 <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 /> Adtianced Geo Eniron mental,Inc <br />