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Page 1 of 1 <br /> Nuel Henderson [EH] <br /> From: Lori Duncan [EH] <br /> Sent: Friday, November 18, 2011 3:09 PM <br /> To: Nuel Henderson [EH] <br /> Subject: 102wilson4.doc <br /> November , 2011 <br /> Carl Knowles, Successor Trustee <br /> Knowles Family Trust Agreement <br /> P.O. Box 640 <br /> Woodbridge, CA 95258 <br /> Subject: Knowles-Roek <br /> 102 South Wilson Way <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Third Quarter 2011 <br /> Groundwater Monitoring Report (Report), dated October 24, 2011, submitted on your behalf by Stratus <br /> Environmental, Inc. (Stratus) and has the following comments. <br /> In the Report Stratus presents the results of a routine groundwater monitoring and sampling event, their <br /> evaluation of the effectiveness of the remediation by periodic hydrogen peroxide injections recently <br /> conducted at the site, and their recommendations for implementing additional remedial activities to move <br /> this site towards closure. <br /> The hydrogen peroxide injection was initiated in November 2010 and continued for a series of 13 <br /> injections through June 2011. In their analysis Stratus considers the positive impact on the petroleum <br /> hydrocarbon contamination to be localized around the injection points, and proposes injecting into <br /> different points across the plume. <br /> The EHD agrees with the recommendation to review and modify the remedial approach at this site. The <br /> EHD also agrees that until active remediation by oxidant injection resumes, the routine groundwater <br /> monitoring and sampling regimen revert to the pre-injection schedule. Please prepare a modified <br /> Remedial Action Plan and submit it to the EHD no later than December 23, 2011. <br /> Vapor well VW-6 has been reported as being collapsed, or obstructed, at the last two monitoring events. <br /> Please evaluate this well and determine if it can be repaired or if it needs to be replaced, and submit a <br /> work plan to do what is necessary to get this point back on schedule prior to the next monitoring and <br /> sampling event. The work plan is due no later than December 2, 2011. <br /> If you have any questions please contact Lori Duncan at (209) 468-0337 or by email at <br /> ]duncan(a,)sj cehd.co m. <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> cc: Jim Barton, CVRWQCB, 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 <br /> Scott Bittinger, Stratus, 3330 Cameron Park Drive #550, Cameron Park, CA 95682 <br /> 11/21/2011 <br />