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f <br /> Page 2 of 4 <br /> R <br /> From: Magee, Amanda [mailto:Amanda.Magee@stantec.com] <br /> Sent: Thursday, March 27, 2014 9:21 AM <br /> To: Vicki McCartney [EH] <br /> Cc: Manning, Danielle; Lichtenberger, Deborah <br /> Subject: RE: 7-11 #20632, 4627 DaVinci Drive, Stockton <br /> Hi Vicki, <br /> We've run into another problem at 7-11 #20632 on DaVinci Drive. At least two feet of pea gravel <br /> was encountered during the clearing of the top five feet of MW-4R. Unfortunately, the boring log <br /> for MW-4R does not have lithology information and does not indicate the total depth of the pea <br /> gravel. Using the air knife and vacuum to clear to the required five feet bgs, along with <br /> overdrilling with the hollow-stem auger,will likely create a large void under the surrounding <br /> concrete as the pea gravel flows into the newly created space. I've attached photos that show <br /> what was encountered yesterday. <br /> In order to avoid undercutting and compromising the stability of the surrounding concrete, <br /> Stantec requests a variance to pressure grout MW-4R using the same specifications as for MW-2 <br /> and SPV-2. In addition, since the area has already been cleared to approximately 2 feet`bgs, <br /> Stantec proposes to create a mushroom cap by overfilling the casing to create a seal in the <br /> surrounding excavated area. The top will then be sealed with concrete to match the surrounding. <br /> Your prompt attention to this matter is appreciated, and please let me know if you have any <br /> questions. <br /> Thank you, <br /> Amanda <br /> Amanda Magee, P.G. <br /> Associate Geologist <br /> Stantec <br /> Phone: (916) 384-0743 <br /> Cell: (916) 747-3181 <br /> amanda.magee@stantec.com <br /> ' t1wt'C <br /> The content of this email is the confidential property of Stantec and should not be copied,modified,retransmitted,or used for any purpose <br /> except with Stantec's written authorization.If you are not the intended recipient,please delete all copies and notify us immediately. <br /> Please consider the environment before printing this email. <br /> From: Vicki McCartney [EH] [ma iIto:vmccartney@sjcehd.com] <br /> Sent: Tuesday, March 25, 2014 3:24 PM <br /> To: Magee, Amanda <br /> Cc: John Yoakum [EH] <br /> Subject: RE: 7-11 #20632, 4627 DaVinci Drive, Stockton <br /> Hi Amanda, <br /> Yes, I meant 25 psi, not 125 psi applied pressure. Sorry about that. <br /> Vicki McCartney, Senior REHS <br /> 3/27/2014 <br />