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Y <br /> CONESTOGA-ROVERS <br /> &ASSOCIATES'.;- <br /> 82;.fbg did not,contain MTBE. Site investigation activities were documented in Cambria's <br /> June 5, 2005 Site Investigation Report and Updated'Sensitive Receptor Survey. <br /> PERIODIC GROUNDWATER EXTRACTION <br /> Periodic groundwater extraction from :wells MW-1 and MW-6 by vacuum truck has been <br /> conducted at the site August 2005. As of May 15, 2007 14,120 gallons of groundwater have <br /> been extracted equating to the removal of 0.054 pounds of TPHg and 0.109 pounds MTBE. - <br /> WORK PLAN <br /> Technical Rationale for Proposed Scope of Work <br /> • Groundwater flow direction beneath this site is consistently toward to the north-northwest. <br /> Groundwater flow direction information from the 7-Eleven site also indicates groundwater <br /> flow direction is consistently toward the north-northwest. Depth to groundwater beneath the <br /> site ranges from approximately 10 to 13.5 feet below grade (fbg). <br /> • `The vertical'extent of impacted groundwater,is defined by groundwater samples collected <br /> from boring:SB-1. :To confirm this data, Shell proposes to install one deep groundwater <br /> monitoring well. <br /> • Historical data shows the vertical and horizontal extent of impacted soil is defined. <br /> • The horizontal!extent of impacted groundwater is definedto the east by well-MW-3 and to <br /> the west by 7-Eleven well MW-8: <br /> • " The horizontal extent of impacted, groundwater is unknown do the northeast, north, and <br /> northwest. <br /> • Shell proposes::installing three groundwater monitoring wells to further assess the horizontal <br /> extent impacted groundwater to the northeast,north,and northwest. <br /> WORK PLAN <br /> Permit: CRA will obtain an appropriate drilling permit from SJCEHD and access agreements for <br /> the offsite well locations. <br /> 1661 3 <br /> Worldwide Engineering,Environmental,Construction,and IT Services <br />