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Page 2 of 3 <br /> Due to the relatively short,5-foot longwell seals in the affected wells,we are proposing to use an air <br /> knife to remove the soil encircling the well box and well seal,'down to the end of the well seal,—5-feet <br /> bgs. The original boring logs show each of the wells have a 5-foot long well seal.After removing the <br /> supporting soil,we are proposing to cut the casing at the base of the well seal, and hoist the well box and <br /> well seal out of the ground as a complete unit, leaving the casing in place in each of the four wells. From <br /> that point,two different methods will be used to finish the destruction. <br /> For the non-obstructed monitoring wells.MW3 and MW4,we are proposing to proceed as originally <br /> proposed and overdrill the remaining casing, screen and construction materials and grout up the <br /> borehole. <br /> For the obstructed wells, MW1 and MW2 we are proposing to use an air knife to remove the soil and the <br /> sand pack materials from around the remaining casing and screen to the excavation depth limitations of <br /> the air knife.Then we are proposing to attempt to remove the casing and grout up the resulting voided <br /> space. If it appears that the entire casing cannot be exposed due to high groundwater, excessive soil <br /> sloughing or limits of the air knife,it has been suggested that perhaps the casing/screen could perhaps <br /> function as a tremmie pipe, by knocking out.or cutting off the terminal cap and filling the void with grout, <br /> as the casing/well screen is extracted. <br /> Does this sound acceptable? <br /> If so, do you need me to amend the workplan to reflect this? <br /> Please call me if you have questions or concerns. <br /> Thanks! <br /> Michael D. Sonke <br /> PROJECT MANAGER I BUSINESS DEVELOPMENT I GHG VERIFIER <br /> CARDNO ATC <br /> 1Ind <br /> ' <br /> ATC <br /> Phone(+1)209-579-2221 Fax(+1)209-579-2225 <br /> Address 1117 Lone Palm Avenue,Suite 2018,Modesto;CA 95351 <br /> Email mike.sonke@cardno.com web www.cardnoatc.com-www.cardno.com <br /> This email and its attachments may contain confidential and/or privileged information for the sole use of the intended recipient(s).All <br /> electronically supplied data must be checked against an applicable hardcopy version which shall be the only document which Cardno warrants <br /> accuracy.If you are not the intended recipient,any use,distribution or copying of the information contained in this email and its attachments is <br /> strictly prohibited.If you have received this email in error,please email the sender by replying to this message and immediately delete and <br /> destroy any copies of this email and any attachments.The-views or opinions expressed are the author's own and may not reflect the views or <br /> opinions of Cardno. <br /> ATC Associates Transitions to Cardno ATC <br /> For many years,ATC has been a valued partner,focused on helping our clients achieve their project goals. <br /> 7/9/2013 <br />