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' Ripona Market October 28,2004 Corrective Action Plan ' Bioscreen4 modeling predicts the MTBE plume to attenuate to less than 10 ug/l at approximately 100 feet within 18 years with a residual groundwater ' contamination in the source area of 380 ug/1 The lack of a significant contaminant reduction in the source area is consistent with the assumed lack of biodegradation of the MTBE 4.2 Oxygen Releasing Compound/Enhanced Natural Attenuation I The use of Oxygen releasing compound (ORC) to provide an oxygenated environment that would stimulate the growth of aerobic bacteria that would biologically reduce the MTBE contamination was evaluated using the Regenesis, Inc "ORC Design Software for Grid Applications Using Slurry Infections" US Version 3 1 A printout of the evaluation is attached in Appendix 4 The oxygen demand for the MTBE contamination is calculated and an appropriate volume of ORC necessary to establish and maintain an oxygenated environment estimated The appropriate number and density of slurry filled borings is also calculated IThe soft ware estimates that 180 pounds of ORC placed in 6 soil bonngs placed on 10 foot centers in the source area (3 rows of 2 borings per row) would establish and maintain an oxygenated environment The estimated cost for the material and ' the drilling using a GeoProbe type machine is approximately $4,000 00 This does not include project management, documentation, and ongoing groundwater monitoring The use of a passive oxidation system does not generate contaminates 10 vapor or water which require treatment and disposal or require continuing onsite monitoring, equipment maintenance or power supply 4.3 Dual Phase Vapor Extraction ,} Dual phase vapor/ water extraction is the use of an applied vacuum to remove air and water from an extraction well The extraction air / water mixture is piped through an setting chamber where the water is collected at the bottom and the air containing petroleum vapors is piped to a scrubber and discharged to the atmosphere Usually a discharge permit from the local Air Pollution Control Boar is required for the discharge Contaminated water is treated usually with carbon filters and either disposal to a sewer system, contained on site and transported to waste recycling center, or discharged to a spray field in areas where sewer service is not available Permits from the Publicly Owned Treatment Works (POTW) are I required for to disposal sewer system for of to the separated Offsite disposal of the extracted water is not cost effective except limited quantities generated during short duration pilot tests The preferred disposal option would involve treatment and disposal to a Publicly Owned Treatment Works (POTW) Pilot test costs including work plans, permitting, and documentation range from I $15,000 to $25,000 for a 5 day test depending on the contamination treatment and disposal costs Installation of a soil vapor extraction system in source area would involve the installation of a vapor extraction well to focus the vacuum at the water 10 I