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T <br /> Angelica Sandoval Marin [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Wednesday, December 24, 2014 8:04 AM <br /> To: Angelica Sandoval Marin [EH] <br /> Subject: FW: Equipment blanks <br /> Angelica, <br /> See Dot's remarks about an equipment blank. <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(aa)sicehd com <br /> j <br /> t// <br /> -3 rp 4p N' <br /> From: Lofstrom, Dot@DTSC [mailto•Dot.Lofstrom@dtsc ca gov] <br /> Sent: Tuesday, December 23, 2014 4:42 PM <br /> To: Vicki McCartney [EH] <br /> Subject: RE: Another question <br /> Keep in mind the purpose of the equipment blank. It's to protect the sampler, not the environment. If the sampler <br /> chooses not to do an equipment blank, it's not really a concern to the regulator. However, if something shows up in the <br /> analysis that cannot be explained, and there is no equipment blank,then the site will have to be resampled. I'm thinking <br /> in particular about a site I had that had unexplained hits of 1,3 butadiene. Subsequently, I've learned that this is often a <br /> false positive that is associated with tubing. If we had done an equipment blank,we may have picked up this <br /> contaminant, and then we would have known it came from the tubing.As it was,the RP had to go back out to the site <br /> and resample. <br /> So, if you have someone who is protesting that they don't want or need to do an equipment blank, I would let it go. It <br /> protects the RP, nothing else. <br /> Dot <br /> From: Vicki McCartney [EH] [mailto:vmccartney(alsjcehd com] <br /> Sent: Tuesday, December 23, 2014 4:30 PM <br /> To: Lofstrom, Dot@DTSC <br /> Subject: Another question <br /> Hi Dot, <br /> This question is about equipment blanks for soil gas sampling. If the tubing and probe tip have been checked as a <br /> material blank, then is it necessary to collect an equipment blank on the day of the soil gas sampling event? The soil gas <br /> probes were installed last week. I don't believe there is any equipment being reused during the soil gas sampling. <br /> Thanks for your help. <br /> Vicki McCartney, Senior REHS <br /> 1 <br />