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Page 1 of 3 <br /> Vicki McCartney.[EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Wednesday, September 07, 2011 3:24 PM <br /> To: 'Kathleen Waldo' <br /> Cc: 'Jim Barton'; 'David Foley' <br /> Subject: RE: 3202 West Hammer Lane <br /> Attachments: MTBE and TPH-d Analytical Data.pdf <br /> Hi Kathleen, <br /> The laboratory analytical results for TPHas diesel(TPH-d)for soil samples TD-2, TD-3 and TPHI S-10, and for <br /> MTBE by method 8260 from soil samples collected at 15 feet belbw surface grade during the UST remaval are <br /> appended for you to review. Please recalculate the estimated residual mass of TPH-d_and MTBE using the data <br /> provided in the attachment. Thank 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: vinceartney n)sjcelid_c�.m <br /> f <br /> From: Kathleen Waldo [ma iIto:kwaldo@closuresolutions.com] <br /> Sent: Wednesday, September 07, ,20118:49 AM <br /> To: Vicki McCartney [EH] <br /> Cc: 'Jim Barton'; 'David Foley' <br /> k Subject: RE: 3202 West Hammer Lane <br />[ Hi.Vicki, <br />; <br /> i Unfortunately no table of historical soil sample results was available, therefore as stated in the <br /> Supplemental Calculations for Closure Review, we obtained soil data from historical Site investigation <br /> summaries. The summaries available indicate that-.soil samples TD-2 and TD-3 were non-detect for TPHd. <br /> The March 2005 Off-Site Monitoring Well Report by SECOR and many other'documents state `Laboratory <br /> analysis of soil samples TD-2 and TD-3 detected maximum concentrations of TPHg at 2,100 ppm (TD-2), <br /> toluene at 3.5 ppm (TD-3), ethylbenzene at 18 ppm (TD-3), bnd total xylenes at 110 ppm-(TD-3). TPHd, oil <br /> I range total petroleum hydrocarbons(TPH-0), and benzene were not detected-above laboratory detection <br /> limits". Therefore, only the data from sample,THP1S-10 was used in the calculation to estimate residual <br /> TPHd in soil. <br /> The investigation summaries available to us did not report MTBE soil results for sample 1E. Based on the <br /> available information, we assumed that sample 3E (MTBE at 80 mg/kg) was collected from the base of the <br /> UST excavation which is currently submerged and therefore the concentration was not used in the soil <br /> calculation. <br /> i <br /> If you have additional data that contradicts our information/assumptions or if you feel the interpretation <br /> I <br /> 9/7/2011 <br />