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�" a3 <br /> Page 1 of 3 <br /> � n <br /> I <br /> II <br /> 1 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Tuesday, January 31, 2012 10:02 AM <br /> To: 'David R. Daniels' <br /> Subject: RE: Former Mobil Service Station located at 25355 North Highway 99, Acampo, CA <br /> Good morning David, <br /> Please correct the 1,2-DCA Regression for MW-1; the concentrations indicate TPH9, not 1,2-DCA. <br /> r <br /> Once you resubmit the revised 1,2-DCA Regression for MW-1, I will forward this information to the Regional ; <br /> Board for their review. <br /> Thank you, David. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> IE Stockton, California 95202 <br /> Phone: (209)468-9852 ; <br /> Fax: (209)468-3433 <br /> Email: vmccartney�7a sjc_ehd-_coni <br /> l From: David R. Daniels [mailto:david.daniels@cardno.com] <br /> Sent: Tuesday, January 31, 2012 8:16 AM - <br /> To:,Vicki McCartney [EH] <br /> Subject: RE:. Former Mobil Service Station located at 25355 North Highway 99, Acampo, CA <br /> Vicki, <br /> y <br /> The 1,2 DCA trend evaluation for 25355 North Highway 99 in Acampo is provided below and in <br /> the attached graphs. Please contact me with any comments or questions. <br /> ESTIMATE OF TIME REQUIRED TO MEET WATER QUALITY NUMERICAL LIMITS <br /> Cardno ERI compared the dissolved-phase concentrations at the site with Water Quality Numerical Limits I <br /> (WQNLs) established by the California Regional Water Quality Control Board, Central Valley Region <br /> (CRWQCB-CVR 2004). <br /> Wells in which 1,2 DCA concentrations exceed WQNLs were graphed versus time and a first-order <br /> exponential decay trendline was added to show when WQNLs will be achieved. <br /> I <br /> I <br /> I Well MW1 <br /> 1,2 DCA concentration in well MW1 increased by approximately one order of magnitude during 2004 and <br /> have since declined. Cardno ERI prepared a regression based on the analytical data following,the 2004 <br /> increase. Based on the regression, the 1,2 DCA WQNL will be achieved in well MW1 in approximately <br /> 1/31/2012 <br />