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1 v Page 5 of 14 <br /> Jl ` <br /> if not, I have to go with MW-1 or MW-9... <br /> From: Chevlen, Benjamin [mailto:Benjamin.Chevlen@stantec.com] <br /> Sent: Monday,January 10, 20113:26 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE: 76 #5886 <br /> Mike—After reviewing the historical data, it appears that the full extent of impacted soil <br /> observed during the excavation of the canopy footings was not removed. The <br /> elevated TPHd concentration detected in P-1-SW-9 (240 mg/kg) on 7/27/95 was <br /> confirmed by a higher TPHd concentration detected in CP-1-SW (1,100 mg/kg)on <br /> 9/22/95. J <br /> I <br /> It appears, however, that the canopy footing replacement activities did remove a j <br /> significant portion of the impact observed in dispenser samples D-24, D-3-3.5, and D- <br /> 7-3.5 and trench sample T-6-4 (highest concentrations in T-6-4) collected on 7/27/95. <br /> If you compare the sample locations for the impacted dispenser and trench locations <br /> to the locations of canopy footing samples collected on 9/22/95 (see Figures 3 and 4 <br /> of Delta's 1996 report), you will notice that CP-1 B and CP-2B were either non-or <br /> trace-detect for TPHg, TPHd, and BTEX. It should be noted that these confirmation <br /> samples while these samples were collected at deeper depths, the excavation <br /> associated with removing the older canopy footings required excavating soil from the <br /> areas of the dispenser and trench locations showing the elevated soil contaminant <br /> concentrations. <br /> i <br /> As for your concern regarding MTBE concentrations being highest in HA-3, <br /> unfortunately, MTBE analysis was not performed prior to the 1997 assessment. The <br /> TPHg, TPHd, and BTEX concentrations can be compared, however, to data collected <br /> from dispenser samples D-6-4, D-7-3.5, and D-8-4, trench sample T-6-4, and canopy <br /> footing samples from July 1995 (P-1NW, P-1-NE, P-1-SW, P-1-SE, and P-1-C) and <br /> September 1995 (CP1-B, CPI-SW, CP1-NW, CPI-WW, and CP1-EW). <br /> i <br /> As for soil data collected during the 2002 AS well installations, you are correct, ERI did I <br /> not have any of the soil boring samples analyzed, <br /> I hope this helps with your understanding of soil conditions at the site. If there are any <br /> questions you have, please let me know. <br /> Benjamin Chevlen,P.G. <br /> Senior Geologist <br /> Stantec - - <br /> Ph: (805)230-1266 Ext.293 <br /> Fx: (805)230-1277 - <br /> Cell: (916)425-4849 <br /> beniamin.chevlen@stantec.com - <br /> stantec.com <br /> t <br /> The content of this email is the confidential property of Stantec and should not be copied, <br /> modified, retransmitted,or used for any purpose except with Stantec's written authorization. If <br /> you are not the intended recipient, please delete all copies and notify us immediately. {f <br /> Please consider the environment before printing this email. <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Friday, January 07, 20114:07 PM <br /> To: Chevlen, Benjamin <br /> 3/14/2011 <br />