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•1 •t <br /> Additional Investigation to Define the Extent of Groundwater Contamination <br /> Quik Stop Market No 121 <br /> Page 8 <br /> that the groundwater data can be incorporated into the October 2001 quarterly sample data, <br /> 2 CCI proposes to prepare a Feasibility Study for the subject site to determine the most cost <br /> effective remediation program for the conditions which currently impact the site The Feasibility <br /> Study will incorporate and review all Dual Phase Mobil Treatment System(MTS) events conducted <br /> at the site to date The study will also review several remedial options and costs associated with each <br /> option Upon completion of the Feasibility Study and review by the County, a Corrective Action <br /> Plan will be prepared for the site, <br /> 3 It is assumed that groundwater pumping will be a viable part of the final remediation plan <br /> for the site CCI recommends that extraction well RW-1 be over-drilled and extended to the bottom <br /> of the A-aquifer (approximately 41 feet) This action will allow a higher pumping rate to be <br /> achieved without dewatering the pumping well and will help to control the shallow contaminant <br /> plume, <br /> 4 Dual-Phase Extraction events will continue to be performed on recovery well RW-1, and <br /> monitoring well MW-3 on a monthly basis The Dual-Phase Extraction events have been conducted <br /> for an 8-hour period over the last 4 months On average, these events have been removing <br /> approximately 9 to 1 I gallons of equivalent product for each 8-hour event, <br /> 5 The next quarterly sample round is scheduled for October 2001 <br /> A copy of this report should be forwarded to the following agency in a timely manner <br /> San Joaquin County <br /> Public Health Services, Environmental Health Division <br /> 304 E Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Attention Ms Lori Duncan <br /> Limitations <br /> The discussions presented in this report are based upon the following <br /> I Exploratory test borings drilled at and around the site, <br /> 2 Observations by the field personnel, <br /> 3 Results of laboratory analyses performed by a state-certified <br /> laboratory, <br />