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Well Destruction Work Plan Pago 2 of 3 C&R International Sales Inc. November 24, 2014 2403 Navy Drive Stockton, CA 95205 The EHD approves the well destruction methods proposed in the work plan with the following conditions: a Use only potable water to mix the cement grout; groundwater displaced from the wells or borings may not be used in grout or for any other purpose and must be properly containerized, labeled, stored and disposed; • Wells proposed to be over-drilled must be drilled out to their total depths; • Over-drilled wells' resulting boreholes shall be filled with neat cement, pumped from the bottom of the borehole up to 3 feet below surface grade (bsg) through a trernie pipe, extending to within 5 feet of the borehole's total depth; o For the well proposed to be pressure grouted, apply at least 25 psi pressure on the grout for 10 minutes; destroy the well by over-drilling if the well casing is unable to withstand this pressure for this length of time; o Following pressure grouting, enlarge the diameter of the top 3 feet of the borehole at least 1 foot larger than the auger originally utilized to install the well; cut off and remove the casing 6 inches above the bottom of the excavation before inserting the grout into the excavation for a thickness of 1 foot; o All Investigation Derived Waste(IDW), including all soil cuttings, groundwater, and water generated from well destruction activities, is required to be properly containerized, labeled, stored and disposed; • A well destruction report describing all well destruction field activities and including the signed manifests for the disposed IDW must be submitted to EHD. The EHD will issue a °No Further Action' closure letter once all wells have been properly destroyed, the signed waste manifests have been submitted, and all invoices have been paid; a Notify the EHD at least 2 weeks prior to implementing fieldwork so that an inspector can schedule to be present for the well destructions; and © The EHD requires that work may begin no sooner than 5 working days after the EHD permits have been issued. During the public participation period, which ended on 16 March 2014, EHD received no comments or concerns from interested individuals and agencies regarding the pending closure of this site. You may proceed with the well destructions if in compliance with the conditions noted above. To proceed with obtaining the destruction permit for these wells, the following must be submitted to the EFID to the attention of Gabriel Gonzalez: • El-ID Well and Goring Permit Application form; o Master File Record form; • Licensed Contractor's Declaration (LCD); and • A fee of$1,300 (7 x $130 + 1 x $390). The permit fee for the destruction of each well is $130, along with a $390 Inspection Activity fee.