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• Page 1 of 2 <br /> Margaret Lagorio [EH] <br /> From: Margaret Lagorio [EH] <br /> Sent: Wednesday, September 23, 2009 4:22 PM <br /> To: 'rarjak'; acolavita@advgeoenv.com <br /> Cc: Vicki McCartney [EH]; Nuel Henderson [EH] <br /> Subject: RE: Lopez Property <br /> Janet&Judy, <br /> The work plan prepared by AGE is based on our letter to you dated April 2, 2009, in which we recommended a <br /> monitoring well be placed east to sourthest of B-6, a boring that was completed in September 2008, where a water <br /> sample collected at 63-66 feet had 14 parts per billion (ppb)of 1,2-DCA. That boring was on the eastern border <br /> of your property. Since contamination has to be defined, the investigation has to be to the east and that means the <br /> City right of way or private property. <br /> Consultants prefer private property for safety reasons(no traffic)during installation and sampling and we agree <br /> with that reasoning. Most property owner don't allow access. Unless we have data from right next to their property <br /> that shows there is contamination on their property, we don't have reason to insist on their cooperation. So in this <br /> case AGE will probably have to put the well on the City right of way. <br /> I don't know the history of the pri ate property, but generally there should not be contamination on the property. <br /> Data from the soil and groundwa er obtained from the new well will be limited to those contaminants on your <br /> property. We hope the well will t a clean and can be used to show the contaminant plume is defined and perhaps if <br /> needed can be used in any groundwater modeling that may be required. <br /> All wells are constructed to keep out surface contaminants so this should not be a concern. <br /> The most eastern monitoring wells on your property are MW 6 and MW11. There have been no detections of 1,2 <br /> DCA in MW6 samples but samples from MW11 have averaged about 80 ppb of 1,2-DCA. You can see all these <br /> data points on the map in the work plan as well as the proposed well location. <br /> I hope this answers your questior s. <br /> Margaret <br /> Margaret Lagorio, REHS <br /> Program Coordinator Unit IV <br /> San Joaquin County Environmen at Health Department <br /> 600 E. Main Street <br /> Stockton, CA 95202 <br /> Phone:(209)468-3449 Fax: (209)468-3433 <br /> E-mail: mlaaorio@sjcehd com <br /> From: rarjak [mailto:rarjak@cleanvire.net] <br /> Sent: Wednesday, September 23, 2009 1:51 PM <br /> To: acolavita@advgeoenv. om <br /> Cc: Margaret Lagorio [EH] <br /> Subject: Re: Lopez Property <br /> Ally, <br /> Our comments to your last -mail: <br /> 9/23/2009 <br />