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0 <br /> Q <br /> ante6group <br /> Antea USA, Inc. <br /> 11010 White Rock Road,Suite 140 <br /> Rancho Cordova, CA 95670 USA <br /> July 27,2022 <br /> Jeff Wong <br /> San Joaquin County Environmental Health Department <br /> Site Mitigation Program <br /> 1868 E. Hazelton Avenue <br /> Stockton,California 95205 <br /> Subject:Revision to May 5,2022, Well Destruction Work Plan for 2085 E. Main Street,Stockton,CA <br /> Dear Mr.Wong: <br /> In response to your communications on June 9,2022,Antea®Group presents,on behalf of BP Products North <br /> America, Inc. (BP),this letter to revise the scope of work outlined in the Well Destruction Work Plan,dated <br /> May 5, 2022 for the planned well destructions at the former ARCO Station 559, located at 2085 E. Main Street in <br /> Stockton,California. <br /> Destruction of wells by pressure grouting is not allowed by the San Joaquin County Well Standard when the well <br /> is in an area containing or suspected to contain contamination.Wells MW-1, MW-2,and MW-4 through MW-6, <br /> were installed to delineate groundwater impact from petroleum hydrocarbons,and as such they are required to <br /> be destroyed by over-drilling to total depth(see Table 1 for well construction details). Each of the wells was <br /> installed using 8.25-inch (nominal) hollow-stem augers,and augers of the same size will be used to remove the <br /> well casing,screen,filter pack, and annular seal to total depth. Each of the wells were installed to 45 feet below <br /> ground surface(bgs). <br /> Following the removal of all well materials from the original boreholes,each will be sealed with neat Portland <br /> cement grout mixed in a ratio of 3.5 gallons of water per 47-pound bag of cement.As presented in Table 2,each <br /> borehole is calculated to require approximately 125 gallons of grout. Following the over-drilling and backfilling of <br /> each well location,the top will be capped with concrete flush to the surrounding surface. <br /> All other tasks included in the May 2022 Well Destruction Work Plan will be followed as outlined in that <br /> document. <br /> I NOGEN® us.anteagroup.Com <br /> ALLIANCE The logo and ANTEA are registration trademarks of Antea USA, Inc. <br /> 1 <br />