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• . Page 1 oft <br /> Lori Duncan [EH] <br /> From: Chevlen, Benjamin [Benjamin.Chevlen@stantec.com] <br /> Sent: Friday, April 02, 2010 9:50 AM <br /> To: Lori Duncan [EH] <br /> Subject: RE: 4707 Pacific <br /> Lori - I've sent an email to TRC requesting clarification on their groundwater purging and sampling procedures; I'll <br /> let you know what I hear. I also requested that during the next sampling event, that they measure DTW in the <br /> wells surrounding what they identify as "VW-2". I instructed them that if what they believe to be"VW-5" has a <br /> total depth significantly greater than 30 feet, then "VW-5" is actually"VW-2." Hopefully we will be able to clarify <br /> this issue. <br /> I also reviewed the historical soil data and agree with you; it is unfortunate soil samples were not collected during <br /> the installation of the sparge wells. I feel a confirmation soil boring in the vicinity of VW-2/5/7 is completely <br /> appropriate. It sounds like a new letter is going to be issued regarding the site; if you would like to discuss the <br /> site status some more before issuing the letter, please call me at your convenience. <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.chevien@stantec.com <br /> stantec.com <br /> The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted,or used for <br /> any purpose except with Stantec's written authorization. If you are not the intended recipient,please delete all copies and <br /> notify us immediately. <br /> Please consider the environment before printing this email. <br /> From: Lori Duncan [EH] [mailto:lduncan@sjcehd.com] _ <br /> Sent: Thursday, April 01, 2010 3:03 PM <br /> To: Chevlen, Benjamin <br /> Subject: 4707 Pacific <br /> Good Afternoon Ben, <br /> I am again trying to sort out this site!A couple of things about monitoring and sampling... <br /> I see that vapor well VW-2 is routinely listed as being 'dry'. This makes no sense, it was built with a screen interval <br /> from 25-50 feet bsg. Unless the well is damaged, there should be plenty of water in it to sample. Vapor well VW-5 <br /> was built with a screen interval from 6-31 feet bsg, and I see it is not even listed in the groundwater analytical <br /> tables (which makes sense). The maps indicate these three wells, VW-2, VW-5 and VW-7, are located very close <br /> together; perhaps VW-2 and VW-5 have been mis-labeled? The few times there was data provided for VW-2 the <br /> concentrations were fairly high. VW-2 should be sampled routinely, it would provide important data on the water <br /> quality of the shallow water above VW-7, which has a totally submerged screen only 5-feet in length. It would also <br /> help'connect'the groundwater data from the VW-2/5/7 area to the VW-4 area, as all the wells near the east side <br /> of the site have such different screen intervals from VW-7. I cannot tell from the groundwater sampling field notes <br /> how they purge VW-7, all it says is 'sub',which I presume means submersible pump, but there is no indication <br /> where they set the pump. Is it at the bottom in the screen interval, or do they evacuate the whole water column? <br /> 4/2/2010 <br />