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Page 1 of 3 <br /> Vicki McCartney [EH] <br /> From: Lofstrom, Dot@DTSC [Dot.Lofstrom@dtsc.ca.gov] <br /> Sent: Monday, March 11, 2013 3:25 PM <br /> To: Vicki McCartney [EH] <br /> Subject: RE: A question concerning soil gas sample collection <br /> Sure. And here is a more thorough response,from Theo: <br /> If the rotary hammer drill is being used in conjunction with a drill rod, like those used on direct push rigs, <br /> then the wait time is 2 hours. If the rotary hammer drill is used with an auger type attachment, the <br /> equilibration time is 48 hours. <br /> Dot <br /> From: Vicki McCartney [EH] [mailto:vmccartney@sjcehd.com] <br /> Sent: Monday, March 11, 2013 1:55 PM <br /> To: Lofstrom, Dot@DTSC <br /> Subject: RE: A question concerning soil gas sample collection <br /> Thanks, Dot. I appreciate your taking the time to investigate and respond to my question. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartney(&sicehd.com <br /> 'SLS•�� 4�:. _ <br /> From: Lofstrom, Dot@DTSC[mailto:Dot.Lofstrom@dtsc.ca.gov] <br /> Sent: Monday, March 11, 2013 1:49 PM <br /> To: Vicki McCartney[EH] <br /> Subject: RE: A question concerning soil gas sample collection <br /> I discussed it with Dan, and we decided that it can be considered a type of direct push, so <br /> equilibration time would be two hours. He has seen it done. <br /> I did the same, but used Wikipedia! <br /> Dot <br /> From: Vicki McCartney [EH] (mailto:vmccartney@sicehd.com] <br /> Sent: Monday, March 11, 2013 11:27 AM <br /> To: Lofstrom, Dot@DTSC <br /> Subject: RE: A question concerning soil gas sample collection <br /> 3/11/2013 <br />