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i 1 <br /> { <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone:(209)838-9888 <br /> { Facsimile: (209)838-9883 <br /> December 16 2009 <br /> Mr.Michael Infurna <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA .95202 . <br /> Subject: Addendum to Appendix A Site Closure:Requesti <br /> 1501 W. CharterWay, Stockton,.CA(Site Code 508175) <br /> Dear Mr..Infurna: <br /> In response to our phone conversation.on December 15, 2009, T Have.pre.pared a brief summary <br /> regarding an estimated time of MTBE concentrations'reachingpthe.water:quality objective (WQO) <br /> of 5 micrograms per liter (pg/L). I have Also included a graph'depicting the attenuation of MTBE <br /> i <br /> overtime in monitoring well MW3. . t <br /> The MTBE fate arid transport inodels discussed in Ground Zero's .4ppend x A Site Closure <br /> Request dated November 12, 2009 indicate MTBE. concentrations will not exceed 5 gg/L at a <br /> distance of up to 135 feet from the source area. This conclusion suggests MTBE will not migrate <br /> + :beyond the property boundaries of the Site. Based on the historical decline in MTBE <br /> concentrations as shown in the attached .graph, Ground Zero concludes that MTBE <br /> concentrations will reach the WQO in approximately,l5 year <br /> , <br /> `aNA! GFS <br /> Respectfully, C3 <br /> Gro ero Analysis,Inc. d� <br /> ERIC LEE PRICE <br /> ` . N0.8414 <br /> i Eric L.Price,PG 84.14 <br /> CA Registered Envi oiunental Assessor I No. 8242 9 <br /> OFA`y�0 <br /> cc: Mr. Nathan Crum, Valley Pacific Petroleum Services, Inc;. <br /> Ms. Karen Collins, Environmental Closures,..Inc: <br /> Mr. James L. L. Barton, RWQCB <br />