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URS <br /> ' Mr. James Barton Page 7 of 8 <br /> California Regional Water Quality Control Board, Central Valley Region <br /> April 29, 2010 <br /> RECOMMENDATIONS <br /> • The approved work plan for the installation of off-site groundwater monitoring wells should be <br /> implemented, upon appropriate approval.MTBE was detected this quarter at 17821 Airport Way <br /> at 17 gg/L, and previous quarters reported MTBE up to 80 µg/L.This domestic well is located <br /> approximately 1,000 feet to the north of the site.The lack of MTBE detected in neighboring <br /> domestic wells near 17821 Airport Way emphasizes the need for further assessment.The <br /> installation of additional off-site monitoring wells will assist in determining the relationship <br /> between the MTBE plume and the hydrogeology of the drinking water aquifer in the <br /> neighborhood. <br /> • A plan should be put into place to address possible future MTBE impacts to neighboring <br /> domestic wells which are currently without treatment systems. <br /> • Following installation and sampling of the new groundwater monitoring wells, a problem <br /> assessment report, feasibility study, and remediation plan should be prepared for the site. <br /> • A groundwater remediation system should be installed and operated to treat the petroleum- <br /> impacted groundwater, which is impacting off-site domestic wells. <br /> • Quarterly groundwater monitoring should continue. <br /> If you have any questions or require additional information,please contact Mr. Vern Elarth at <br /> (916)679-2299. <br /> ' Sincerely, ED GE�� <br /> URS Corporation Americas ���' N?AU( � OC <br /> l/ <br /> NO. 7120 <br /> M cie Redmond Vernon P. Elarth,RG * Exp. 3 <br /> ' Task Manager Proj ect Manager <br /> MAR/VPE:rrd 9TF OF CPLY <br /> Attachment A Groundwater Sampling Field Data Sheets <br /> Attachment B Laboratory Analytical Report and Chain-of-Custody Documents <br /> Attachment C Geotracker Upload Confirmation <br /> Table 1 Well Construction <br /> Table 2 Groundwater Elevation Data <br /> Table 3 Groundwater Analytical Data <br /> Table 4 Groundwater Flow and Gradient Data <br /> H:\Wprocess\RESD\Franks One Stop\QTR 10\I QMR 10 Report.doc <br />