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Page 2 of 2 <br />Sent: Monday, May 20, 2013 7:30 AM <br />To: Michael Carroll <br />Cc: Joyesh Chandra; Wyels, Wendy@Waterboards <br />Subject: RE: Replacing groundwater wells at several San Joaquin County Landfills <br />Mike, I reviewed this plan. Replacing GW that are going dry is the correct thing to do. Thank you. I have a <br />question about screen length and your detail shows a 1 -inch diameter well casing within the same boring as the <br />2 -inch diameter well casing. The borehole diameter is only 6 -inches? Can you clarify please. <br />Sure, <br />We use that smaller riser for sounding the water level. We had problems at one well because the sounder got <br />caught on the several tubes and wires that are part of the pump power and discharge. It isn't a frequent <br />problem, but the time to set up to prevent it in the future is in the construction of the well. <br />The 6 -inch bore isn't big enough for a production well, but is appropriate for groundwater sampling per <br />recommendations by our friends at CB&I (previously Shaw). <br />See you <br />Mike. <br />Phone (Direct): 209-468-8504 <br />From: Michael Carroll fmailto:mcarroll@siaov.ora] <br />Sent: Wednesday, May 15, 2013 4:00 PM <br />To: DelFrate, Todd@Waterboards <br />Cc: Joyesh Chandra <br />Subject: Replacing groundwater wells at several San Joaquin County Landfills <br />Hi Todd, <br />I thought I would send this letter by email as well as hardcopy by landmail. <br />Best regards, <br />Mike <br />W. Michael Carroll, PE <br />Senior Civil Engineer, Public Works/Solid Waste <br />Phone (Direct): 209-468-8504 <br />5/22/2013 <br />