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�T <br /> June 29, 2023 <br /> Mr. Jeff Wong <br /> San Joaquin County Environmental Health Department <br /> 1868 E. Hazelton Avenue <br /> Stockton, California 95205 <br /> Subject: Subsurface Investigation Work Plan Addendum, Former Stockton <br /> City Taxi Cab Company, 2085 East Fremont Street, Stockton, <br /> California <br /> Dear Mr. Wong: <br /> Pursuant to your request on June 23, 2023, ATC Group Services LLC doing business as Atlas <br /> Technical LLC (Atlas) has prepared this work plan addendum on behalf of the Ernest R. Foppiano <br /> Family Trust describing proposed methodology to abandon two soil borings and two soil vapor <br /> points that will be advanced and installed, respectively, at the subject site (Figures 1 and 2). You <br /> requested the work plan addendum as a condition for issuance of a drilling permit to advance the <br /> soil borings and install the soil vapor points at the subject site. <br /> SOIL BORING ABANDONMENT AND SOIL VAPOR SAMPLING PROBE DESTRUCTION <br /> Per Atlas' Subsurface Investigation Work Plan (Work Plan), dated December 21, 2023, two soil <br /> borings are proposed to be advanced to 11 feet below ground surface (bgs) at the approximate <br /> locations shown on Figure 3. Following collection of soil samples from these borings, the borings <br /> will be abandoned by pouring a cement grout slurry into the boreholes and bringing the grout <br /> slurry up to the level of the surrounding grade. <br /> Per the Work Plan, two additional shallow soil borings are proposed to be advanced to depths of <br /> six feet bgs and completed as permanent soil vapor sampling probes (Figure 3). Upon completion <br /> of the project or when it is determined that the soil vapor sampling probes are no longer needed, <br /> the soil vapor sampling probes will be destroyed by removing the materials installed in each <br /> borehole by overdrilling with an auger to six feet bgs. The auger will be removed from the <br /> boreholes and the boreholes will be filled with a cement grout slurry up to the level of the <br /> surrounding grade. <br /> If you have questions or require additional information regarding this work plan, please contact <br /> us at (209) 579-2221. <br /> �pP1AL G <br /> Respectfully submitted, Fo�o <br /> Atlas Technical LLC <br /> a TODD C.HAMER <br /> N0.8090 <br /> Todd Hafner, P.G. OF cA0F�� <br /> CA Professional Geologist No. 8090 <br /> 1117 Lone Palm Avenue, Suite 201 B, Modesto, CA 95351 <br /> 209.579.2221 1 oneatlas.com <br />