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� v o .. 01 A S S O C I A T E S I N C detectable limits for samples collected from wells MWI, MW3, MW4, MW6, MW8, and MW10 Groundwater samples collected from MW1 and MW7 contained slightly increased concentrations of TPHg and BTEX with respect to the samples collected from these wells in June 2003 There are petroleum hydrocarbons remaining in the soil and groundwater The direction of groundwater flow and the magnitude of hydraulic gradient are generally consistent with the previous event Groundwater elevations have decreased slightly since June 2003 The vapor extraction system is operating at approximately 100 cfm and petroleum hydrocarbon vapor concentrations in vapor wells V W 1 through V W3 increased during the third quarter with respect to the second quarter 2003 The vapor extraction system is extracting approximately 24 gallons per hour from vapor wells V W 1, V W2, V W3, and V W4 The air sparge system appears to be operating within design parameters RECOMMENDATIONS Based on the results of the Third Quarter 2003 monitoring event, we recommend the following • Because of continuous high concentrations in well MW1, ATC recommends connecting MW1 to the extraction system network A stinger should be installed in well MW1 to M allow for extraction of vapor and groundwater from the well The current vapor and groundwater extraction system should accommodate the additional groundwater extracted from well MW 1 I ® Conduct the Fourth Quarter 2003 groundwater monitoring and sampling of wells MW1 through MW 10 and CW and analyze samples for TPHg and BTEX by EPA methods 8015B and 8021B, respectively, and MTBE, ETBE, TBA, TAME, and DIPE by EPA method 8260B • Continue monthly monitoring of the vapor extraction, groundwater treatment and discharge system, and air sparge system w lwordpro1625961quart1yl3gr-2003 doc 8