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! Page 2 of 2 <br /> Regressions were not performed on wells MW2, MW5, MW7, MW8, MW9, or MW10. Well MW2, MW8, and MW9 <br /> have not had a reportable concentration above the laboratory reporting limit during the monitoring program. Well <br /> MW5 and MW7 has not had a reportable concentration of 1,2 DCA since March of 2008. Well MW10 had a <br /> reported concentration of 2.6 pg/L during the initial sampling event in August 2010, and has since not had <br /> reportable concentrations. <br /> David R. Daniels, PG 8737 <br /> Senior Staff Geologist <br /> Cardno ERI <br /> 601 North McDowell Blvd., Petaluma, CA 94954 <br /> Phone: 707 766 2000 Direct: 707 766 2024 Mobile: 707 338 6997 Fax: 707 789 0414 <br /> From: Vicki McCartney [EH] [ma i Ito: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 Analysis, and Request for <br /> Closure, dated 28 September 2011 for the Former Mobil Service Station 99AGA located at 25355 North Highway <br /> 99, Acampo, California. Missing from the report was an estimate of the time it will take before the groundwater <br /> contaminant concentrations of 1,2-dichloroethahe (1,2-DCA)will return to water quality goals. Please provide I <br /> trend graphs and time predictions, supported by calculations, for meeting water quality objectives for 1,2-DCA. <br /> This information can be sent to me in an email and I will forward this information to Jim Barton, PG, at the <br /> California Regional Water Quality Control Board'Central Valley-Region. 4 <br /> .i <br /> Vicki McCartney, Senior REHS i <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton,California 95202 <br /> Phone: (209)468-9852 <br /> Fax: (209)468-3433 <br /> Email. vmccartiley@,5jechd.com <br /> k <br /> 1 <br /> i <br /> I <br /> I <br /> 1/31/2012 <br />