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Vicki McCartney EH <br />From: Vicki McCartney [EH] <br />Sent: Tuesday, September 27, 2011 1:54 PM <br />To: 'Jim Barton' <br />Cc: Nuel Henderson [EH] <br />Subject: RE: FW: Update on LOC #s 19093 and 2371 <br />Jim, <br />I can see that there is a lot for us to talk about so I am putting this site on the agenda <br />for the Unit IV October meeting set for October 12, 2011. <br />Vicki McCartney, Senior REHS <br />San Joaquin County <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202 <br />Phone: (209) 468-9852 <br />Fax: (209) 468-3433 <br />Email: vmccartney@sjcehd.com <br />-----Original Message ----- <br />From: Jim. Barton[mailto:jbarton@waterboards..ca.gov] <br />Sent: Tuesday, September 27, 2011 12:58 PM <br />To: Vicki McCartney [EH] _ <br />Cc: Nuel Henderson (EH] <br />Subject: Re: FW: Update on LOC #s 19093and2371 <br />Thanks Vicki, <br />It is not uncommon ,for soil contamination to reach groundwater years after an initial <br />release, so PSC's argument the. PZ -1 and PZ -2 trend was invalid due to early low numbers <br />Producing an increasing trend is not valid. They even state percentages of reductions <br />(trends) in more recent PZ -1 and PZ -2 data. If the reductions are valid, then using the <br />more recent data thatshows a definite later declining trend could be justified for an <br />estimate for time to reach WQGs. Even with noise.in the data (small spikes), one could <br />justify when concentrations would remain below WQGs using the maximum concentrations as <br />the points for linear regression in a graph. We can discuss this more next month, or <br />after Nuel has had a chance to .respond to my question. Thanks. <br />Jim <br />James L.L. Barton; P.G. <br />Engineering Geologist <br />California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center <br />Drive, Suite 200, Rancho Cordova, CA 95670 office (916) 464-4615 <br />fax (916) 464-4704 <br />>>> "Vicki McCartney [EH]" <vmccartney@sjcehd.com> 9/27/2011 12:44 PM <br />This is the email from John Carrow. <br />Vicki McCartney, Senior REHS <br />San Joaquin County <br />Environmental Health Department . <br />600 East Main Street ' <br />Stockton, California 95202 <br />Phone: (209) 468-9852 <br />Fax: (209) 468-3433 <br />Email: vmccartney@sjcehd.com <mailto:vmccartney@sjcehd.com> <br />1 <br />