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Page 1 of 2 <br />Natalia Subbotnikova [EH] <br />From: Robert McClellon [EH] <br />Sent: Monday, August 03, 2009 2:27 PM <br />To: Michael Kith [EH]; Natalia Subbotnikova [EH]; Benjamin Escotto [EH] <br />Subject: FW: What -ifs in advance <br />FYI <br />From: Robert McClellon [EH] <br />Sent: Monday, August 03, 2009 11:26 AM <br />To: 'Michael Carroll'; Kevin Jorgensen II <br />Cc: 'Peter Holland'; Joyesh Chandra <br />Subject: RE: What -ifs in advance <br />Please keep in mind that this does not mean that you don 't need to get an approval from EHD. It is fine to have a <br />script, but the changes should flow through the communication chanels that have been set up. Robert <br />From: Michael Carroll [mailto:mcarroll@sjgov.org] <br />Sent: Monday, August 03, 2009 9:48 AM <br />To: Kevin Jorgensen II <br />Cc: Robert McClellon [EH]; 'Peter Holland'; Joyesh Chandra <br />Subject: What -ifs in advance <br />Good morning Kevin, <br />I thought it would be useful to know EHDs position on two points that could come up in the LFG <br />perimeter migration monitoring well project. If the questions come up from the Contractor, you <br />will know what the answer from EHD will be. <br />1 am doing what I can to ensure that contractor issues get taken care of quickly, trying to foresee <br />what may come up, get them answered in advance. Robert McClellon was kind enough to help <br />with this. <br />The first question was related to the thickness of sand lenses lens or equivalent high -permeability <br />stratum (if encountered) and the movement of the bentonite plug to avoid them. If a sand stratum <br />is 20 feet thick or less then we will move the plug. If the sand lenses is greater than 20 feet <br />thick, we will leave it at the design depth. <br />The second question related to construction of the wells in an open hole, which might be the case <br />with an the air -rotary rig. Of concern to EHD was the potential for sloughing of soil into the hole <br />overnight. Robert said that an acceptable way to address this concern would be to measure <br />distance at the end of the day to whatever is left in the hole, and re -measure at the start of the <br />next day. EHD is not requiring that the well be completed once construction starts. <br />I hope this is useful. <br />And of course, our friends from Vector know that "n or directive to the contractor <br />8/3/2009 <br />