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STC <br />February 25, 2022 <br />Mr. Jeff Wong <br />San Joaquin County <br />Environmental Health Department <br />1868 E Hazelton Avenue <br />Stockton, California 95205 <br />1117 Lone Palm Avenue, Suite 201 B <br />Modesto, California 95351 <br />Telephone 209-579-2221 <br />Subject: Monitoring Well Destruction Workplan Addendum, Jamar Service Station, 4075 East <br />Main Street, Stockton, California. LUST Case: 391042 <br />Dear Mr. Buehler: <br />ATC Group Services LLC (ATC) doing business as Atlas Technical (Atlas) has prepared this <br />addendum to Atlas's Monitoring Well Destruction Workplan (Workplan) dated August 9, 2021 and <br />the Monitoring Well Destruction Workplan Addendum dated January 4, 2022. This addendum was <br />requested by San Joaquin County Environmental Health Department (SJC) via e-mail on January <br />20, 2022 and subsequent phone conversations. The change in the scope of work is described in <br />detail in the following paragraphs. <br />Well Destruction Activities <br />In the Workplan and Addendum, Atlas proposed to destroy all wells associated with the project site <br />by overdrilling the total length of the well. Atlas now proposes to destroy these wells, utilizing the <br />services of Tylor McMillian's Well Service, LLC to provide blasting services alongside C-57 drilling <br />contractor MR Drilling. A blasting charge will be introduced into the well and the casing be backfilled <br />with neat cement grout, via tremmie pipe. The blasting will be designed to destroy the screen interval <br />of the well. After the screen interval is destroyed, the top five feet will be overdrilled via auger drilling <br />and the resulting borehole be backfilled to approximately one foot below grade with neat cement <br />grout. The well casing to the surface will be grouted to approximately one foot of the surface. The <br />top five feet will be overdrilled and the resultant borehole will be backfilled with neat cement grout to <br />within one foot of the surface. The surface will be completed to match surrounding conditions. <br />If you have questions or comments regarding this project, please contact our office at (209) 579- <br />2221. <br />Respectfully submitted, <br />Atlas Technical <br />�� a4� <br />JQVn Sellman <br />Staff Geologist <br />cc: Ms. Lori Toccoli <br />Jeanne Homsey, P.E. <br />CA Professional Engineer No. 47410 <br />