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I ' 20 August 2003 AGE-NC Project No 95-0173 ' Page 8 of 8 • Due to a malfunction in the SVE electric control panel, the SVE unit was non-operational ' for repairs and maintenance between 20 March and 01 April 2003 6.0. RECOMMENDATIONS ' Based upon first quarter 2003 data collected from the site, AGE recommends • Continued quarterly ground water monitoring and sampling ofwells MW-I through MW-13, AW-lA, AW-1B, AW-2A and AW-2B, ground water sampling results will be used to monitor progress of the SVE and IAS remediation system • Continued operation of the on-site SVE and IAS remediation system, however, AGE will reduce IAS and influent SVE air flow to reduce the potential for ground water mounding, SVE and IAS remediation progress will be reevaluated on a quarterly basis To address deeper petroleum hydrocarbon-impacted ground water at the site, AGE previously . proposed that at least one additional remediation alternative be evaluated due to the modest clean-up ' effectiveness being encountered utilizing IAS The well-defined, laterally continuous, sandy nature of Hydrologic Unit 2 (38 feet to 65 feet bsg) is suitable for a ground water extraction system screened solely through Hydrologic Unit 2, Implementation of a ground water pump-and-treat technology would augment the IAS clean-up efforts in Hydrologic Unit 1 A revision to Work Plan Addendum (dated 06 November 2002) was approved by the SJCEHD by letter dated 18 November 2002 for installation of one ground water extraction well and performance of ground water pump testing The ground water extraction well was installed at the site in January ' 2003,well development activities were performed on the well in February 2003 During July 2003, AGE performed an 8-hour`step' and a 12-hour`constant'rate ground water pumping test to evaluate ground water extraction(i a pump-and-treat) as a remediation alternative AGE is in the process of evaluating the pump test data and a report of findings is forthcoming 7.0. LIMITATIONS Our professional services were performed using the degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based mainly upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions at the site for the purpose of this investigation is made from a limited number of available data points(e g ground water and SVE air flow samples),and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report IAdvanced GeoEnvironmental,Inc I