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Page 2 of 3 <br /> From: DelFrate,Todd@Waterboards rmailto: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 <br /> annular space. 2-inch diameter usually calls for 8-inch borehole and if you are stuffing another 1-inch <br /> diameter tube into it,the boring will be very cramped. Please check and let me know. I assume no more <br /> than 20-feet of screen. Correct. <br /> From: Michael Carroll rmailto:mcarroll@sj oq v.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 rmailto:Todd.Del Fratecawaterboards.ca.gov] <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 <br /> a question about screen length and your detail shows a 1-inch diameter well casing within the same <br /> boring as the 2-inch diameter well casing. The borehole diameter is only 6-inches? Can you clarify <br /> please. <br /> Sure, <br /> We use that smaller riser for sounding the water level. We had problems at one well because the <br /> sounder got caught on the several tubes and wires that are part of the pump power and discharge. It <br /> isn't a frequent problem, but the time to set up to prevent it in the future is in the construction of the <br /> 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 rmailto:mcarroll@sigov.org] <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 /> 5/20/2013 <br />