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qbv <br /> Page 1 of 3 <br /> Mike Infurna [EH] <br /> From: Mike Infurna,[EH] <br /> Sent: Monday, March 17, 2008 10:23 AM <br /> To: 'Brian Stringari' 1 <br /> Cc: 'kelly.bay@delmonte.com'; 'brenda.crawford@patc-usa.com' <br /> Subject: RE: MW-5 and MW-6 abandonment a_ <br /> Thank you Brian for the proposal. <br /> l <br /> Since this latest change is acting like a work plan revision, per your advise, I will comment on it like it IS the <br /> final draft of a work plan. <br /> The proposal to 'pressure grout' these two wells is approved with the following <br /> conditions/clarifications: 1! <br /> 1-prior to any excavation at the well head or any addition , EHD is to be present to 'tag' the total depth of the <br /> well to verify it is unobstructed to total depth constructed. Casings with obstructions greater than or equal to 1 <br /> foot must be cleared or removed prior to 'pressure grouted' or OVER BORED as an alternative destruction <br /> method. Only unobstructed can be pressure grouted. EHD personnel will verify this first thing at the <br /> appointment time requested by Kleinfelder. <br /> 2- If unobstructed, each well casing is to be tremied filled from the bottom with cement grout and then <br /> 'pressure grouted' PRIOR to any excavation to avoid debris entering and possibly obstructing the casing. <br /> 3- after the well casing.has been properly filled with grout and the effluent/purged water collected (this water is <br /> to be characterized or added to MW sampling purge water barrels onsite for proper disposal), LIQUID pressure <br /> (air pressure NOT recommended) is to be applied to the well casing until NO drop of the grout level is detected. <br /> Be sure to provide a 'system' / 'method' that will allow a positive connection of the well casing head to the <br /> device delivering the pressure so that no unsafe 'uncoupling' of this device occurs as pressure is provided. Check <br /> with the driller/C-57 to see what method they plan on using). <br /> 4- after it has been determined that NO drop in the grout level inside the casing is occurring, the well head <br /> excavation may begin. <br /> 5- the excavation at each well head is to be NO LESS than 20-inches in diameter from the casing center( 22- <br /> inches for 4-inch PVC casings) and shall extend to a depth of 36-inches bgs. The PVC casing is then to be cut <br /> off 6-inches above the bottom ( at 30-inches bgs). Additional grout shall be added to the casing and allowed to <br /> overflow into the 36-inch deep excavation up to 18-inches bgs, thus forming the "mushroom cap". After the <br /> grout sets, ok to backfill to the surface with any material to match exisiting. The cement grout MAY continue <br /> to .5 or 1-foot bgs if OK with the landowner and act as a base for surface patching. <br /> To avoid EHD charges during the excavation process, after the pressure grouting is complete and the grout level <br /> is NOT dropping anymore, you MAY dig the 36-inch hole without EHD present. If so, then recall me/EHD so <br /> that I can witness the final step of adding the grout forming the mushroom cap. <br /> In my experience, the digging of this 36-inch hole is labor intensive and can take up to an hour for each well <br /> when done correctly. By correctly I mean, the BOTTOM of the 36-inch hole is ALSO NLT 20-inches wide, or 22- <br /> inches for 4-inch casings. Tappering holes will not be accepted. This gap in EHD presence could save you <br /> multliple hours at$98/hour. Your choice. Just let me know. <br /> Please respond to let me know you understand and agree. <br /> 3/17/2008 <br />