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Page l of 1 <br />Vicki McCartney [EH] <br />To: Carrow, John (PSC); Nuel Henderson [EH] <br />Cc: Anderson, Paul (PSC) <br />Subject: RE: Earthgrains, 2651 South Airport Way, Stockton <br />John: <br />Nuel He is not in the office today so I have not discussed the proposals submitted in your e-mail <br />below with Nuel. <br />I do have concerns about using mud rotary drilling when collecting soil samples for lithological evaluation. The <br />problem with mud rotary is that the soil combines with the mud. As a result, soil lithology can not be determined. <br />You may want to reconsider this matter before submitting the work plan. <br />Vicki McCartney, Senior RE14S <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: vmccartnevrr�sjcehd.com <br />From: Carrow, John (PSC) [mailto:JCarrow@pscnow.com] <br />Sent: Monday, July 27, 2009 12:02 PM <br />To: Nuel Henderson [EH]; Vicki McCartney [EH] <br />Cc: Anderson, Paul (PSC) <br />Subject: Earthgrains, 2651 South Airport Way, Stockton <br />Vicki, <br />Thank you for taking the time to discuss the review of the above referenced project. As I mentioned on the phone, <br />PSC and Sara Lee are anxious to close the data gaps and finish the FS/RE at Airport Way. We believe the data gaps <br />(one deep well in the source area for vertical extent and an evaluation of the potential for soil vapor intrusion ) should <br />be assessed prior to completion of the FS/RE. Therefore, we would like to submit a brief work plan for well <br />installation and the evaluation for potential vapor intrusion within the next few weeks. <br />We have preliminary plans to install a well near CPT -M5 with a screen interval of 120 to 130 feet depending on <br />observed lithology. We will be using mud rotary drilling so that we can sample soil and check for lithology while <br />sealing off the permeable zone encountered between 48 and 70 feet bgs. We feel that this will provide best data on <br />deep lithology and will help to install a good well to provide the most discrete samples. Details of the drilling and <br />well installation as well as the evaluation on the need to collect soil gas samples for the soil vapor intrusion survey <br />will be presented in the work plan in the next couple of weeks. <br />In order to avoid comments and response to the work plan, we would appreciate your and Nuel's feedback on this <br />preliminary approach. If you have questions you may call me on my cell phone listed below. <br />Thank you again. <br />John R. Carrow, RG <br />PSC Remediation Services Group <br />cell 618-792-2468 <br />n <br />7/27/2009 <br />