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Page 1 of 2 <br />v <br />Natalia Subbotnikova [EH] <br />From: <br />Robert McClellon [EH] <br />Sent: <br />Wednesday, May 22, 2013 2:38 PM <br />To: <br />Natalia Subbotnikova [EH] <br />Subject: FW: Bore diameter for replacement groundwater wells at several San Joaquin County Landfills <br />FYI <br />From: Michael Carroll [mailto:mcarroll@sjgov.org] <br />Sent: Tuesday, May 21, 2013 7:45 AM <br />To: DelFrate, Todd @Waterboa rds; Robert McClellon [EH] <br />Cc: Joyesh Chandra; Wyels, Wendy@Waterboards; Isham, Julian <br />Subject: Bore diameter for replacement groundwater wells at several San Joaquin County Landfills <br />Good morning gentlemen, <br />It seems we have caused some concern by calling out "6 -inch minimum" bore diameter in our figures. These are <br />the figures we used to bid this work, but the actual bore diameter will be 10 inches, which will provide the <br />minimum clearance between risers and wall of the bore hole. We will show this dimension on our as -built <br />drawings. <br />I hope this allays all concerns. <br />Best regards as always, <br />Mike Carroll <br />W. Michael Carroll, PE <br />Senior Civil Engineer, Public Works/Solid Waste <br />Phone (Direct): 209-468-8504 <br />From: DelFrate, Todd@Waterboards [ma ilto:Todd. Del Frate@waterboards.ca.gov] <br />Sent: Monday, May 20, 2013 10:00 AM <br />To: Michael Carroll <br />Cc: Joyesh Chandra; Wyels, Wendy@Waterboards; Isham, Julian <br />Subject: RE: Replacing groundwater wells at several San Joaquin County Landfills <br />Mike, I would check with EHD concerning the borehole diameter. My experience tells me not enough annular <br />space. 2 -inch diameter usually calls for 8 -inch borehole and if you are stuffing another 1 -inch diameter tube into <br />it, the boring will be very cramped. Please check and let me know. I assume no more than 20 -feet of screen. <br />Correct. <br />From: Michael Carroll [mailto:mcarroll@sjgov.org] <br />Sent: Monday, May 20, 2013 9:39 AM <br />To: DelFrate, Todd@Waterboards <br />Cc: Joyesh Chandra; Wyels, Wendy@Waterboards; Isham, Julian <br />Subject: RE: Replacing groundwater wells at several San Joaquin County Landfills <br />From: DelFrate, Todd@Waterboards [mailto:Todd.DelFrateCa)waterboards.ca.govI <br />5/22/2013 <br />