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I <br /> Ms Vicki McCartney Project 880-040 1 A/0107 <br /> 16 February 3, 2003 <br /> Page 2 <br /> h <br /> Remedial activities conducted on January 26, 2000, included removal of approximately <br /> 262 tons of impacted soil in the area below dispenser and product lines Excavation areas <br /> were selected based on the January 7, 2000 sampling results Excavation was restricted <br /> laterally by concrete canopy footings and asphalt surfacing Due to close proximity of <br /> groundwater, the maximum excavation depth was 10 feet bgs Results of soil sampling and <br />' excavation were reported in IT's, Product Line Upgrade and Soil Excavation Report, dated <br /> March 15, 2000 The San Joaquin County Environmental Health Department (SJCEHD) <br /> requested in a April 24, 2000 letter, further delineation of soil and groundwater impacts <br /> On August 15 and 16, 2000, a total of five Geoprobeo borings (GP-1 through GP-5) were <br /> completed using a direct push rig The borings were advanced to groundwater, at which <br /> time a discrete water sample was collected Following groundwater sample collection the <br /> borings were continued to a maximum depth of 30 feet bgs <br /> On September 6, 2000, three groundwater monitoring wells (MW-1 through MW-3) were <br /> installed The well locations were selected based on the Geoprobe0 investigation results <br /> Well locations are shown on Figure 1 Quarterly groundwater monitoring and sampling was <br />' Qinitiated in September 2000 <br /> In their letter dated October 31, 2001, the SJCEHD requested a work plan to define the <br /> vertical and lateral extent of soil and groundwater contamination and determine an interim <br /> remedial alternative to control the off-site migration of methyl tert-butyl ether (MtBE) A <br /> work plan dated December 12, 2001 was prepared describing the implementation of a 5-day <br /> dual phase extraction event, the installation of two down gradient wells, and one deep soil <br />' boring The work plan was approved by the SJCEHD on December 31, 2001 <br /> On May 22 and 23, 2002, Shaw observed the drilling of one deep soil boring and the <br /> installation of two monitoring wells (MW-4 and MW-5) The vertical extent of <br /> hydrocarbon impact appears to have been defined by the deep soil boring <br /> f <br /> Environmental,IncShaw F <br /> N IsaLDP120031Pg188018800401A 3aa do(- <br />