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San Joaquin County Environmental Health Department <br />October 27, 2017 <br />Page 2 <br />The following activities will be performed. <br />Prefield Activities <br />Obtain drilling permit from San Joaquin County Environmental Health Department. <br />Notify Underground Service Alert (USA). <br />Exploratory Drilling <br />Mobilize drill rig and support equipment. <br />Drill the exploratory borehole using the following procedures: <br />Advance a 7-inch diameter bit with 6 3/4-inch diameter casing using a sonic drill <br />rig to the total borehole depth of 125 feet. <br />Collect soil sample(s) for physical properties testing or laboratory analysis for <br />volatile organic compounds. <br />Abandon borehole by installing neat cement through drill casing. Cement will be <br />tremmied in the borehole from the bottom up while simultaneously removing <br />drill casing. <br />The investigation-derived waste (IDW) materials generated during exploratory <br />drilling, which will include soil cuttings, groundwater, and decontamination water, <br />will be containerized and characterized for proper disposal. <br />SCHEDULE <br />The City has scheduled to complete the exploratory drilling activities described in this work plan <br />during November 2017, pending approval of the drilling permit from San Joaquin County <br />Environmental Health Department. <br />Please contact Varinder Oberoi at (925) 425-5626 or voberoi@westyost.com with any questions <br />regarding this work plan. <br />Sincerely, <br />WEST YOST ASSOCIATES <br />Varinder Oberoi, PE <br />Principal Hydrologist <br />RCE #p69037 <br />VO:BJL:lh <br />Attachment <br />Benjamin J. Lechler, PG <br />Senior Hydrogeologist <br />PG #8229 <br />WEST YOST ASSOCIATES 0\013 \17-17-42\wp\EW-7R Exploratory Boring Work Plan