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' 1,2 DCA concentration in well MW3 increased do a maximum concentration of 350 Ag/L <br /> in December 2004 and have since declined. <br /> Cardno ERI prepared a regression based = the analytical data following the .December 2004 <br /> sampling event. Based on the regression., the 1,2 DCA WQNL will be achieved in well MW3 in <br /> approximately 2028. <br /> Well MW4 <br /> Well MW4 was first sampled in June of 2005 and does not show the increase- observed <br /> in wells MW1 and MW3 during 2004. Cardno -ERI prepared. a regression based on the all of <br /> the analytical data collected from well MW4 . Based on the regression, the 1,2 DCA WQNL <br /> will be achieved in well <br /> MW4 in approximately 2014. <br /> I <br /> Remaining Wells <br /> Regressions were not performed on wells MW2,. MW5, MW7, MW8, MW9, or MW10. Well MW2, <br /> MWS, and MW9 have not had a reportable concentration above the laboratory reporting limit <br /> during the monitoring program. <br /> Well MW5 and MW7 has not had a reportable concentration of 1,2 DCA since- March of 2008. - <br /> Well MW10 had a reported concentration of 2.6 µg/L during the initial sampling event in <br /> August 2010, and has since not had reportable concentrations. <br /> David R. Daniels, PG 8137 <br /> Senior Staff Geologist <br /> Cardno ERI <br /> I 601 North McDowell Blvd.., Petaluma,- CA 94954 <br /> 4 <br />! Phone: 707 766 2000 Direct: 707 766 2024 Mobile: ' 707 338 <br /> 6997 Fax: 707 789 0414 <br /> From: Vicki McCartney [EH] [mailto:vmccartney@sjcehd.com] <br /> Sent: Tuesday, January 24, 2012 9:55 AM <br /> To: David R. Daniels <br /> Subject: Former Mobil Service Station located at 25355 North. Highway 99, Acampo, CA <br /> Good morning David, <br /> Nuel Henderson, PG, and I discussed the data submitted in Mass Calculations, Trend <br /> Analysis, and Request for Closure, dated 28 September 2011 for the Former Mobil Service <br /> Station 99ACA located at <br /> 25355 North Highway 99, Acampo, California. Missing from the report was an estimate of <br /> the time it will take before the groundwater contaminant concentrations of 1,2- <br /> it dichloroethane (1, 2-DCA) will return to water quality goals_ Please provide trend graphs <br /> 4 <br />