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Page 3 of 3 <br /> 1./ <br /> Ms McCartney, <br /> Please find attached calculations for groundwater to reach water quality objectives(WQOs) <br /> for the subject site. <br /> CRA prepared time to reach WQO calculations for wells S-1,S-1-85, S-3-84, S-4, S-4-83, <br /> and S-6. If a constituent of concern(COC) in a well was below its respective WQO for at <br /> least the last four consecutive sampling events then CRA did not prepare time to reach WQO <br /> calculations for it. The exception was for 1,2-DCA in wells S-2 and S-5,and benzene in S-6, <br /> where the COCl during the last four sampling events were overall lower than WQOs. <br /> Please let me know if I can start to prepare the public notification letter. <br /> Regards, <br /> Larry J. Silva <br /> Conestoga-Rovers & Associates (CRA) <br /> 10969 Trade Center Drive, Suite 107 <br /> Rancho Cordova, CA 95670 <br /> Phone: 916.889.8914 <br /> Fax: 916.889.8999 <br /> Email: lsilva@craworld.com <br /> www.CRAworld.com <br /> From: Vicki McCartney [EH] rmailto:vmccartnev(asicehd.com] <br /> Sent: Monday, May 12, 2014 9:36 AM <br /> To: Silva, Larry <br /> Subject: 2494 Fremont <br /> Good morning Larry, <br /> I received notification from the Regional Board that no additional sampling will be required at <br /> Fremont Shell Station at 2494 East Fremont Street in Stockton since it appears that no <br /> chemicals of concern were detected from soil samples collected during both waste oil tank <br /> removals. <br /> The only thing that I need now is for CRA to provide the time required for groundwater to <br /> return to water quality objectives. Once I receive this information, I will begin preparing the <br /> Case Closure Summary to send to the Regional Board. <br /> Larry, when do you estimate that I will receive this information? <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartnev(&sicehd.com <br /> ! kW 1' <br /> 7/14/2014 <br />