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0 0 Page 1 of I <br />Mike Infurna [EH] <br />From: Mary Walden [mwalden@greggdrilling.com] <br />Sent: Wednesday, August 29, 2007 8:56 AM <br />To: Mike Infurna [EH] <br />Subject: VAPOR SAMPLE QUESTIONS <br />HI MIKE <br />THE DIAMETER OF THE CPT RODS ARE APPROX 1.5" — 1 7/8" <br />AFTER THE VAPOR SAMPLE IS COMPLETE THE EQUIPMENT WILL BE REMOVED <br />FROM THE HOLE AND THEN THE HYDROPUNCH RODS WILL BE DRIVEN DOWN <br />AND GROUT WILL BE TRIMIED THROUGH THE RODS. WE USE 95% PORTLAND 5% <br />BENTONITE. ONCE THE GROUTING IS COMPLETE WE WILL PATCH THE HOLE <br />WITH THE SAME AS THE EXSITING MATERIAL (CONCRETE/ASPHALT/DIRT) WITH <br />THE SAME THICKNESS. I HOPE THIS HELPS, LET ME KNOW <br />HAVE A GREAT DAY <br />MARY <br />Mary Walden <br />Operations Manager <br />Gregg Drilling & Testing, Inc. <br />950 Howe Road <br />Martinez, CA 94553 <br />Phone: 925-313-5800 <br />Fax: 925-313-0302 <br />mwalden@greggdrilling.com <br />www.greggdrilling.com <br />8/29/2007 <br />