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Former Moore Petroleum Bulk Plant Page 2 of 3 5491 F Street December 26, 2012 Banta, California 95304 Over-drill monitoring wells MW-1, MW-2, MW-3, MW-4A, MW-5, MW-7NEW-4, MW-8NEW-3, MW-9, MW-10, MW-12, MW-15, and MW-18; ozone spare wells OS-1, OS-2, OS-3, OS-6, OS-7, 0", and OS-10; vapor extraction wells VEW-1 and VEW-2; and recovery well RW-2. y • Pressure grout monitoring wells MW-6, MW-11, MW-13, MW-14, MW-16, and MW-17; and ozone sparge wells OS-4, OS-5 and OS-9. When pressure grouting each well, apply 25 psi of liquid pressure for at least ten minutes, then drill out the top three feet or more of the well with an auger that is at least one foot larger in diameter than the auger originally used to install the well. The well casing should be cut off six inches above the bottom of the three-foot hole, allowing the grout sealant to spill out of the top of the well casing and form a "mushroom cap" seal with at least twelve inches of neat cement grout poured six inches above and six inches below the top of the cut-off casing. Monitoring well MW-18 was constructed with a steel conductor casing from approximately fifty feet below surface grade (bsg) to surface- The conductor casing may remain in place; however, the two-inch diameter Schedule 40 polyvinyl chloride (PVC) casing, filter pack, and grout between the PVC casing and metal conductor casing must be removed and the borehole filled under pressure from total depth of approximately 80 feet bsg to surface with 10.3 Sack sand/cement grout, forming a "mushroom cap"at approximately three feet bsg. All groundwater displaced to the surface during grout installation must be pumped out of the excavation to allow for the EHD inspection and verification that the well has been properly destroyed. Contaminated groundwater pumped out of the excavation must be containerized for proper disposal. This site has seven wells located off-site in the San Joaquin County right-of-way and at least one well on the Union Pacific Railroad Company property. Please submit a copy of the valid encroachment permit issued by the County and a copy of the access agreement from the Union Pacific Railroad Company when submitting the EHD Well and Boring Permit Application form for these wells. The EHD approves the work plan with these conditions. Please submit the EHD Well and Boring Permit Application form for each parcel, Master File Record (MFR) form, Encroachment Permit issued by the County of San Joaquin Department of Public Works, and the appropriate fees for each parcel. The permit fee for the destruction of each well is $125.00, along with a $375.00 Inspection Activity fee per parcel. A review of the site records indicates that 31 wells currently are installed. A fee of $5,000.00 (31 wells x $125.00 + $375.00 x 3) will be required for the well destruction permits. r Please provide the EHD certification in writing that all record owners of fee title to the above- referenced site have been notified of your request for closure. This is in accordance with Section 25297.15 of the California Health and Safety Code. Submit a complete list of record owners of fee title and their mailing addresses to the EHD. If you are the sole landowner, provide a statement to this effect to the EHD. A form has been enclosed for this purpose. r v V