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Page 3 of 5 <br /> Just to clarify about the air sampling: <br /> 1) Now that the mitigation system is operational we are approved to collect indoor and <br /> ambient air samples every six months, meaning since the system went online in <br /> late June we should schedule indoor and ambient air sampling for late December <br /> 2012? And then 6 months later? <br /> 2) Approval for crawl space sampling, are you referring to an air sample collected from <br /> the mitigation system PVC riser or from the actual crawl space using Summa <br /> Canisters as we have done before? <br /> 3) 1 ask for clarification because I might have confused the situation by just stating we <br /> were going to install a sampling port in the PVC riser to evaluate the air extracted <br /> from the crawl space instead of requesting approval to do that. This was never <br /> proposed or discussed with you; I just thought it might be a good idea to collect one <br /> air sample to see what we are extracting. What do you think about this? Should we <br /> collect an air sample from the PVC riser or just wait and collected a sample from <br /> the crawl space in 6 months? <br /> Sorry if I caused any confusion. <br /> And thank you very much for the update regarding the other sites. <br /> Have a good day and talk to you soon. <br /> Sincerely, <br /> Brian W. Millman <br /> California Professional Geologist#8574 <br /> Advanced GeoEnvironmental, Inc. <br /> Stockton • Santa Rosa • Monterey • Brea • Spokane • Reno • Dallas <br /> 1-800-511-9300 <br /> bmillman@advgeoenv.com <br /> www.advgeoenv.com <br /> This email/fax message is for the sole use of the intended recipient(s)and may contain confidential and privileged <br /> information.Any unauthorized review, use,disclosure or distribution of this email/fax is prohibited. If you are not the intended <br /> recipient, please contact the sender by email/fax and destroy all paper and electronic copies of the original message <br /> From: Vicki McCartney [EH] rmailto:vmccartnek@sjcehd.coml <br /> Sent: Thursday, July 26, 2012 2:43 PM <br /> To: bm_illman(&advgeoenv.com <br /> Subject: RE: LOP Site Updates, Scheduling, and Inquiries <br /> Good afternoon Brian, <br /> I am pleased to learn that the soil vapor intrusion mitigation system is in operation at the Weldon <br /> Church site at 104 Beverly Place in Tracy. I considered driving by this site today but time <br /> constraints prevented me from doing so. <br /> You mentioned that the first application of injecting five percent RegenOx will take place the third <br /> week of August. You will need a boring permit for the 5 boreholes to be injected. I will be on <br /> vacation from August 9th through August 17th, returning to work on August 20th, so I hope you plan <br /> to do the injections the week of August 20th. <br /> I will plan to be at the site on August 2nd for the sampling event. What time will the field technician <br /> be there? <br /> Our department has approved collecting ambient and indoor air samples every six months after the <br /> 8/8/2012 <br />