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Y Page 2 of 3 <br /> Dot, <br /> 'Googled' rotohammer and it is a hand drill but subslab samples are not being collected. The work plan <br /> proposes this drilling technique to be used in places where truck-mounted direct-push technology access is <br /> not possible. <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: vmccartneya-sicehd.com <br /> y <br /> From: Lofstrom, Dot@DTSC [maiIto:Dot.Lofstrom @dtsc.ca.gov] <br /> Sent: Monday, March 11, 2013 11:16 AM <br /> To: Vicki McCartney [EH] <br /> Subject: RE: A question concerning soil gas sample collection <br /> Vicki, <br /> Is this like a hand drill? Are you talking about subslab samples? I'll ask Theo, because I'm not <br /> familiar with this technique. <br /> Dot <br /> From: Vicki McCartney [EH] fmailto:vmccartnev@sicehd.com] <br /> Sent: Monday, March 11, 2013 10:33 AM <br /> To: Lofstrom, Dot@DTSC <br /> Subject: A question concerning soil gas sample collection <br /> Hi Dot, <br /> Hope you are doing well. <br /> I have a question concerning the duration of equilibration time after the soil gas probe has been <br /> installed using a rotohammer. The Advisory-Active Soil Gas Investigation, dated April 2012, does <br /> not cover using this drilling method to install temporary soil gas wells. Any information you can <br /> provide will be greatly appreciated. <br /> Thank you. <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: vmccartnev(@sicehd.com <br /> 3/11/2013 <br />