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GROUND ZERO <br /> ANALYSIS,INC. <br /> 1172 Kansas Avenue,Suite A <br /> Modesto,CA 95351 <br /> 209.522.4119-PH <br /> 209-522.4227-FAX <br /> groundzeroanalysis.com <br /> April 29,2024 <br /> Mr.Jeffery Wong <br /> San Joaquin County Environmental Health Department <br /> 1868 E.Hazelton Ave. <br /> Stockton,California 95205 <br /> Subject: Well Destruction Work Plan Former Skip's Service Station <br /> 300 S.California Street, Stockton,CA <br /> Geotracker Global ID#T0607700605 <br /> Dear Mr.Wong: <br /> We are submitting the following well destruction permit application package on behalf of Ms. <br /> Sharon Olivarez. Well Destruction Permit application forms by parcel along with the appropriate <br /> initial fees are included in Attachment A. The November 15, 2023, Central Valley Regional Water <br /> Quality Control Board(RWQCB)letter requesting monitoring well destruction and waste removal is <br /> included in Attachment B. The location of the Site is shown on Figure 1, and the locations of the <br /> wells are shown on Figure 2 of Attachment C. <br /> Construction details of the wells proposed for destruction are listed in Table 1 and Table 2 of <br /> Attachment D. <br /> Blasting and Grouting Groundwater Monitoring and Extraction Wells <br /> Fourteen groundwater monitoring wells and one extraction well (EW-1) will be destroyed by the <br /> blasting and grouting method. Each well will be tagged for total depth to ensure there are no <br /> obstructions within the well casing. Any obstructions will be removed. Detonator cord will be <br /> placed from the bottom of the well to a depth of ten feet below the casing collar. A neat cement <br /> grout will be pumped through a tremie pipe from the bottom of the well in one continuous <br /> operation. After the groundwater has been displaced and the grout has been filled to the top of <br /> the well casing, the detonator cord will be fired. If the grout settles, additional grout will be <br /> pumped into the well casing. <br /> The wellbox will be removed and the top three to five feet of the well will be excavated at least <br /> one (1) foot larger in diameter than the auger originally used to install the well. Grout sealant will <br /> be allowed to spill out of the top of the well casing to form a mushroom cap seal approximately <br /> one foot in thickness. The remaining hole will be filled with soil and the surface restored. Any <br /> excess soil and well debris will be properly containerized for disposal. Any groundwater <br /> displaced to the surface during grout installation containerized for proper disposal. <br /> Well Destruction Workplan <br />