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Page 2 of 3 <br /> remove the soil encircling the well box and wel seal; down to the end.of the well seal,^5-feet bgs. The original <br /> boring logs show each of the wells have.a, 5-foot long well seal:After removing the supporting soil,we are <br /> proposing to cut the casing at the base of-the well seal;and hoist the well box and well seal out of the ground as <br /> a complete unit,leaving the casing in place in each of the four wells. Trom that point,two different methods <br /> will be used to finish the destruction <br /> For the non-obstructed monitoring wells MW3 and-MW4,we are proposing to proceed as originally proposed <br /> and overdrill the remaining casing, screen and construction materials and-grout up the borehole. <br /> For the obstructed wells, MW1 and MW2 we are proposing to use an air knife to remove the soil and the sand. <br /> pack materials from around the remaining casing and screen to the excavation depth limitations ofthe air knife. <br /> Then we are proposing to attempt to remove.the`casirig and grout up the resulting voided space. If it.appears <br /> that the entire casing cannot be exposed due to,high groundwater, excessive soil sloughing or limits of the air <br /> knife, it has been suggested that perhaps.the casing/screen could perhaps function-as a tremmie. pipe,.by <br /> knocking out or cutting off the terminal cap and filling the void with grout, 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 GHG VERIFIER <br /> CARDNO ATC <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.corh <br /> This email and its attachments may contain confidential'and/or,privileged,information for the sole use of the intended recipient(s).All electronically <br /> supplied data must be checked against an applicable`hard copy version which shall be the only document which Cardno warrants accuracy.If you are <br /> not the intended recipient,any use,distribution or copying of the information contained in this email and its attachments is strictly prohibited.If you have <br /> received this email in error,please email the sender by replying to this'message and immediately delete and destroy any copies of this email and any <br /> attachments.The views or opinions expressed are the author's own and may not reflect the views or opinions of Cardno.. <br /> t <br /> ATC Associates Transitions to Cardno ATC <br /> For many years,ATC has been a valued partner,.focused on'helping our clientsachieve their project goals.This <br /> past March,ATC joined forces with global environmental and professional services leader, Cardno. Cardno <br /> delivers physical, social, and economic infrastructure services worldwide.With ATC, Cardno employs <br /> approximately 7,500 staff in over 270 offices worldwide. 4,500 of those staff are within the-U.S. <br /> 7/5/2013 <br />