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Mr.James L.L.Barton • Former Countryside Market ' <br /> October 24,2012 Stockton,California <br /> Page 2 of 2 <br /> head treatment samples should be collected during routine groundwater sampling events to <br /> determine when replacement of the carbon is necessary and ensure the treatment system is <br /> reducing 1,2-DCA to concentrations below the MCL. SGI estimates the carbon in the lead bed <br /> will need to be replaced every 3,400 days. Final well head treatment design may be modified <br /> based on input from the property owner. <br /> Well Head Treatment Cost <br /> The current contract between SGI and DGS includes $5,244 for contingent well head treatment <br /> cost. The estimated cost for the installation of the proposed well head treatment system is <br /> $4,500, which includes equipment and subcontractor costs of$2,500. <br /> Schedule <br /> The work scope presented here is scheduled to be implemented following the approval of the <br /> RWQCB and should take approximately 30 days to complete. <br /> SGI appreciates the opportunity to conduct this work for you. Should you have any questions <br /> about the scope of work or any other issues with respect to this project, please call Greg McIver <br /> at (530) 272-4200. <br /> Sincerely, <br /> The Source Group, Inc. <br /> Greg McIver <br /> Project Manager <br />