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Michael Kith <br />December 20, 2017 <br />If debris is present in a well, it will be removed by the driller. A hole 1-foot larger in diameter than the well <br />diameter will be cleared to a minimum 3-feet below ground surface (bgs) using an air-knife. The well <br />casing will then be cutoff at 2.5-feet bgs. INJ-14 will be cleared to 6-feet bgs and the casing will be cutoff <br />at 5.5-feet bgs to accommodate the planned development. The blasting cord with booster charges will be <br />installed in the wells and a cement slurry will be pumped into the well casing via a tremie pipe placed near <br />the bottom of the well and raised to the surface as the grouting progresses. The volume of grout placed <br />will be calculated to confirm it exceeds the casing volume of the well being destroyed. The explosives will <br />be detonated. Additional grout will then be pumped into the well as necessary. The grout will be allowed <br />to mushroom over the top of the casing and into the excavated borehole around the casing to 1-foot <br />above the base of the excavated borehole. The remainder of the borehole will be filled with native soil to <br />grade to match existing conditions. Well destruction activities will be recorded on a Well Destruction Log <br />(Attachment C). <br />Following monitoring well destruction activities, Water Well Completion Reports will be filed with the <br />California Department of Water Resources (DWR) and with the City of Lathrop. <br />Sincerely, <br />Arcadis U.S., Inc. <br />0/44 beer <br />Jenifer Beatty, PG-CA (6650) <br />Project Manager <br />Copies: <br />Roger Smith (GSH) <br />Cybil Bryant (Buzz Oates) <br />Enclosures: <br />Tables <br />1 Well Construction Details <br />Figures <br />1 Site Location Map <br />2 Site Plan <br />3 Site Plan Parcel 198-120-090 <br />Attachments <br />A Monitoring Well Blast Plans and Well Service Blasting License <br />B Boring Logs <br />C Well Destruction Log <br />arcadis.com <br />a \Projectslathrop \Deliverables \2017-07 Well Destruction Work Plan \Addendum\Well blasting addendum.docx <br />Page: <br />2/2