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Page 1 of 4 <br /> Mike Infurna [EH] <br /> From: Phillips, Hollis [Hollis.Phillips@arcadis-us.com] <br /> Sent: Wednesday, July 16, 2008 10:01 AM <br /> To: Mike Infurna [EH] <br /> Subject: RE: UPRR Tracy WP -APPROVAL by DTSC <br /> Bentonite it is — <br /> Hopefully we'll be in enough GW so we don't have to leave them. <br /> Hollis E. Phillips, PG <br /> Sr. Geologist <br /> ARCADIS-US, Inc. <br /> 155 Montgomery St., Ste. 1500 <br /> San Francisco, CA 94104 <br /> 415.374.2744 X13 <br /> 510.219.7764 (cell) <br /> 415.374.2745 (fax) <br /> hollis.phillips@arcadis-us.com <br /> APlease consider the environment before printing this email <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Wednesday, July 16, 2008 9:59 AM <br /> To: Phillips, Hollis <br /> Subject: RE: UPRR Tracy WP - APPROVAL by DTSC <br /> any longer in the ground than the times you are actually working on/with them shall <br /> have an impermeable seal placed from the top of your filter pack to the surface so <br /> that no preferential pathway is provided. <br /> recommend a bentonite seal if you'd rather not use neat cement on the GPWs left <br /> overnight. <br /> From: Phillips, Hollis [ma ilto:Hollis.Phil lips@arcadis-us.com] <br /> Sent: Wednesday, July 16, 2008 9:10 AM <br /> To: Mike Infurna [EH] <br /> Subject: RE: UPRR Tracy WP - APPROVAL by DTSC <br /> We are planning on sampling the GPS the same day as installation (Thursday). If they do not <br /> recharge by the end of the day we'll place (not grouted) Christy boxes over them and return on <br /> Friday (and Saturday, if necessary). The site is surrounded with construction fencing so they will <br /> not be accessible. Let me know if the County will require a different method of well head <br /> protection. <br /> As far as destruction they'll be grouted (free fall) with neat cement grout after the temporary wells <br /> have been destroyed. <br /> 7/16/2008 <br />