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Thomas W. Butler II, PG,CHG,CEG <br /> Senior Hydrogeologist/Geochemist <br /> Stantec <br /> Ph: (925)296-2126 <br /> Fx: (925)296-2105 <br /> Thomas.Butler aestantec.com <br /> stantec.com <br /> The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any <br /> purpose except with Stanteds written authorization. If you are not the intended recipient, please delete all copies and notify us <br /> immediately. <br /> Please consider the environment before printing this email. <br /> From: Butler, Thomas (Walnut Creek) <br /> Sent: Tuesday, January 15, 2013 1:38 PM <br /> To: 'jyoakum@sjcehd.com' <br /> Subject: Lathrop Borings <br /> Importance: High <br /> Johnny, attached is a map the shows the existing temporary piezometers(yellow) and the locations where we would like <br /> to do our coring work identified in black sharpie. Our workplan involves taking a small remote access drilling rig and drill <br /> with continuous core at 5 to 6 locations. The intent of the borings are to characterize lithology down to a depth between <br /> 20 to 30 feet below ground surface. Following drilling, all but one of boreholes will be abandoned with grout. One of the <br /> borings will however be converted to a temporary piezometer using approximately 10 feet of 0.01-inch slot, %-inch PVC <br /> screen and%inch blank PVC casing. The filter pack will consist of a#2/12 or similar sand with bentonite grout sealing <br /> the annulus. <br /> Please let me know if this is sufficient information to proceed. We would like, if possible, to drill tomorrow, beginning at <br /> 7am. If you have any questions, please call me on my cell at(925)699-8012. Thank you very much for your assistance! <br /> Thomas W. Butler <br /> Senior Hydrogeologist/Geochemist <br /> 2 <br />