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II . April 2001 AGE-NC Project No 95-0143 Page 6 of 6 effectiveness of the vertical vapor extraction wells • Considering the escalating cost of natural gas needed to operate the catalytic system, reinitiation of the SVE system should be postponed until conditions at the site warrant the expense Work has begun on improving the efficiency of the SVE system. • During the quarter the SVE operation removed approximately 25 2 gallons of gasoline • Dissolved oxygen levels have dropped significantly due to the shut-down of the air spargung system. 5.0. RECOMMENDATIONS Based upon data collected during the November 2000 and previous sampling events and SVE system monitoring results, AGE recommends • Continued quarterly monitoring of the group. Water monitoring well system on the site The E . next quarterly monitoring was performed in February 2001, concurrent with monitoring at the Madison site • Completion ofthe scope ofwork proposed mAGE's RemedialAction WorkPlan Addendum February 2001, dated 26 February 2001 • Lmuting ground water analysis to TPH-g and BTEX Fuel additives (DIPE and TBA) have been detected only sporadically at very low concentrations(less than 7 µg/1)since monitoring began in 1997 6.0. LIMITATIONS Our professional services were performed using that 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 mdependent laboratory Evaluations of the soil and ground water conditions at the site have been made from a lurnted number of available data points (i e ground water samples and measurements and SVE system monitoring points), and subsurface conditions may vary through time and with distance from these data points No other warranty, expressed or implied, is made as to the professional reconnmendatzons contained in this report Advanced GeoEnvire=c 4 Inc