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30 January 1998 <br /> i AGE-NC Project No 95-0104 <br /> Page 4 of 4 <br /> distribution of dissolved benzene in wells MW-1, MW-5, MW-6 and VW-1 is depicted in <br /> Figure 5 Well screen intervals are listed in Table 1 <br /> • Concentrations of toluene and xylenes detected in VW-1 exceed the MCLs for drinking <br /> water of 150 ppb and 1,750 ppb, respectively <br /> • Utilizing EPA methods 8020 and 8260, concentrations of MTBE were not detected above <br /> the laboratory reporting limits <br /> • Utilizing EPA methods 8260, concentrations of DIPE, TAME, and ETI3E were not detected <br /> above the laboratory reporting limits <br /> 50. RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE recommends the following <br /> • Preparation of a Remedial Action Work Plan should commence upon PHS-EHD approval <br /> P PP <br /> • of the Revised Corrective Action Plan(RCAP) submitted to the PHS-EHD on 18 February <br /> t1997 <br /> • Continuation of quarterly monitoring and sampling should next be scheduled for March <br /> 1998 It is recommended that quarterly sampling be performed only from monitoring wells <br /> with proper screened intervals across the top of the ground water table <br /> 5.0. 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 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) and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is [Wade as to the professional <br /> recommendations contained in this report <br /> Advanced GeoEmironmental,Inc <br />