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Former American Forest F- ,ducts Page 2 of 2 <br /> 2801 West Lane, Stockton CA October 23, 2008 <br /> concentrations in samples from DMW-6 and DM -9 appear to be reasonably predictive <br /> as demonstrated by subsequent monitoring date. Before concurring with your closure <br /> request, the EHD must be assured that the initial data from the recently installed <br /> monitoring wells is representative of site conclitions and the EHD believes that only a few <br /> additional monitoring events are needed to demo strate the down-gradient extent of the <br /> plume and that the contaminant concentration trends shown by URS are predictive and <br /> reliable. Therefore the EHD cannot concur with your closure request at this time. This <br /> decision is subject to appeal to State Water Resource Control Board (State Water <br /> Board), pursuant to HC&SC Section 25296.40{a (1), (Thompson-Richter Water Board <br /> Underground Storage Tank Program Reform Act Senate Bill 562). Please Contact the <br /> State Water Board Underground Storage Tank Program at (916) 341-5752 or visit the <br /> State Water Board internet website at <br /> ht!p.:://www.waterboards.ca.gov/ust/cleanur)/petitioris.html for information regarding the <br /> appeals process. <br /> The EHD will carefully review the monitoring data to minimize the number of quarterly <br /> monitoring events necessary to establish the con entration trend. At this point the EHD <br /> interest-is on sampling only-those wells commonly impacted--by 1;2-DCA and you may <br /> suspend sampling of upgradient, cross-gradient and deep wells that are not impacted by <br /> 1,2-DCA pending the results of the additional ry onitoring of the impacted wells and <br /> further closure consideration of the EHD. <br /> If you have any questions, please contact Frank Girardi, Senior Registered Environmental <br /> Health Specialist at (209) 953-7868. <br /> Frank Girardi, Senior REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> C: James Barton, RWQCB, 11020 Sun Center Dr. 200, Rancho Cordova, CA 95670. <br /> Tony Mindling, URS, 2870 Gateway Oaks Drive, Suite 300, Sacramento, CA 95833. <br /> H:IWORD-Site Specific Letters and Docslwest Lane 28011081023dire tive <br />