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W. <br />r - <br />I provided information aboutty�e domestic and irrigation wellsv"'A/nd mass estimates in an <br />email to you dated September 16, 2011. I also sent anemail to John Carrow,. PG, of PSC <br />Industrial Outsourcing, LP (PSC) asking him to provide estimates when site conditions <br />would return to water quality objectives. <br />John Carrow sent an email to me today in which he pointed out that water quality <br />objections were addressed in Section 4.1 and 4.2 of Feasibility Study/Remedial Evaluation <br />and Case Closure Request Report (report), dated 07 October 2009. <br />PSC did not provide trend analyses for groundwater from PZ -1 and PZ -2 (the two most <br />impacted wells) for reasons given in Section 4.1 of the report. <br />Simply put, benzene concentrations will be below the MCL in 35 years and TPH-g <br />concentrations will be below the ESL in 61 years for groundwater in MW -1; and benzene <br />concentrations will be below the MCL in 12.5 years and TPH-g concentrations will be below <br />the ESL in 30 years for groundwater in SP -2. <br />Based on the information provided, would you like to continue discussions about closure <br />consideration of this site at our next Unit IV meeting? <br />Vicki McCartney, Senior REHS <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: vmccartney@sjcehd.com <mailto:vmccartney@sjcehd.com> <br />From: Vicki McCartney [EH] <br />Sent: Friday, September 16, 2011 1:21 PM <br />To: 'Jim Barton' <br />Subject: Earthgrains Baking Companies, Inc. site at 2651 Airport Way, Stockton <br />Good afternoon Jim, <br />Concerning the Earthgrains Baking Companies' site at 2651 Airport Way in Stockton that we <br />discussed on Wednesday, September 14, 2011, during the Unit IV meeting, I was able to <br />verify that one of the domestic wells south of the site has been destroyed. The domestic <br />well at 2733 South Airport Way was destroyed in 2007. I also was able to verify that the <br />irrigation well and domestic well at 2607 South Airport Way are still in operation. <br />During the meeting, you also asked about mass estimates for this site. <br />The mass estimates were included in Feasibility Study/Remedial Evaluation and Case Closure <br />Request Report, dated 07 October 2009. PSC reported that 1.6 kilograms (kg) of residual <br />benzene and. 3,900 kg of residual TPH-g were estimated to be in soil; and 13.6 kg of <br />residual benzene and 498.4 kg of residual TPH-g were estimated to be in groundwater. Nuel <br />calculated the masses of benzene and TPH-g in groundwater to be 0.0136 kg and 4.984 kg, <br />respectively. <br />Today I sent an email to John Carrow, PG, of PSC Industrial Outsourcing, LP (PSC) asking <br />him to provide an estimate of the time it will take before the groundwater contaminant <br />concentrations at this site will return to water quality goals. Once I hear from John, I <br />will forward this information to you. <br />Vicki McCartney,. Senior REHS <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: vmccartney@sjcehd.com <mailto:vmccartney@sjcehd.com> <br />F1 <br />