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r - .Ahy Cal Tech-T&T.pdf [ Page 1 of 2 <br /> v U <br /> Mike Infurna [EH] <br /> From: Mike Infurna [EH] <br /> Sent: Friday, July 18, 2008 3:59 PM <br /> i4 To: 'acolavita@advgeoenv.com' <br /> Cc: 'rmarty@advgeoenv.com' <br /> Subject: RE: TBT <br /> I'll look at this, but typically we like/request that prior to system changes on <br /> SVE/thermo to GAC for instance, you allow this down time to act as a <br /> 'pulse'.....either resample again to see if there is a substantial rebound and how long <br /> it lasts. <br /> If the data suggests that thermo-destruction is no longer cost-effective, then by all <br /> means adjust to a more cost-effective means. <br /> trust me, changing out GAC can be just as costly/problematic. <br /> From: Ally Colavita [mailto:acolavita@advgeoenv.com] <br /> Sent: Friday, July 18, 2008 3:44 PM <br /> To: Mike Infurna [EH] <br /> Cc: rmarty@advgeoenv.com; 'Art Deicke' <br /> Subject: T&T <br /> Hi Mike— <br /> Regarding T&T Trucking, <br /> The latest vapor results from last Friday the 11th (attached) were non-detect. The Brown and <br /> Caldwell-prepared and EHD-approved RAP states on Table 4-1 on page 4-8 of the RAP. the <br /> SVE unit would be switched to a GAC system when concentrations dropped below 200 ppm. <br /> r This has been achieved, so we'd like to do that. <br /> Coincidentally and problematically, the excessive cost of propane (approximately $7500/month) <br /> has caused the client a bit of grief and we have not refilled the propane tank. The SVE unit shut <br /> off(ran out of fuel) late Tuesday or early Wednesday. <br /> We are now in the process of making the switch to a carbon filter-based remedial system as per <br /> the RAP. There are a few hoops to jump through including modifying the air permit. <br /> So, with your concurrence of our interpretation of the RAP, we will proceed. <br /> Thanks Mike. Have a great weekend, and I hope to see you soon, <br /> Ally Colavita <br /> t W <br /> Staff Scientist <br /> Advancerl GeoEnvirontnental, Inc. <br /> 837 Shaw Road, Stockton, CA 95215 <br /> Phone: (209) 467-1006 <br /> Fax: (209) 467-1118 <br /> 7/18/2008 <br /> i <br />