Laserfiche WebLink
. 6 . 0 CONCLUSIONS AND RECOMMENDATIONS <br /> In general, the P&T system was minimally effective in groundwater <br /> remediation and proved to be very cost-ineffective This system operated <br /> as an interim system until the more effective AS/VE system became <br /> operational Due to the significant bio-fouling during the operation, the <br /> system became less effective with time and ASE does not recommend any <br /> further operation of this system <br /> The AS/VE system has been very effective in soil and groundwater <br /> remediation at the site During the period of operation of this system, a <br /> significant decrease in hydrocarbon concentrations was achieved, with <br /> free-floating hydrocarbons being present at the site when the system <br /> began operation to the present period where no BTEX or MTBE is present <br /> at the site at concentrations exceeding WQOs However, given the <br /> relatively low hydrocarbon concentrations remaining in groundwater at <br /> the site, as well as no TPH-G detected in the influent air samples during <br /> the last two months of operation, the system will no longer be efficient in <br /> remediation at the site For this reason, ASE recommends that the <br /> operation of this system be discontinued ASE recommends that quarterly <br /> groundwater monitoring continue at the site to monitor the ongoing <br /> natural attenuation processes <br /> ASE also recommends that the operation continue on the domestic <br /> wellhead treatment systems until such point that no MTBE as detected in <br /> the influent water samples <br /> Frank's One Stop Interim Effectiveness Report — November 2003 <br /> -7- <br />