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Paul Banks and Associates, LLC Exhibit L-Reclamation Costs Reclamation costs for this mining permit were based on the maximum disturbed acreage (80 acres) at any given time; not including plant and stockpile areas, backfilled, graded or reseeded areas. The DRMS approved the current reclamation bond of $410,693 on June 4,2004. As discussed in Exhibit E - Reclamation Plan, a slurry wall of approximately 13,094 feet in length is requred for Mine Area 1. A planning number for the cost of slurry wall construction is $3.00 per square foot. Thus, 13,094 feet bng x 35 feet deep equals 458,290 square feet. Constructing this slurry wall would therefore cost approximately $1,375,000. Mine Area 2 rnpounds approximately 353 acre-feet of water. This requires a slurry wall approximately 6,565 feet long. Thus, 6,565 feet x 35 feet deep equals 229,775 square feet. Constructing the slurry wall would therefore cost approximately $689,000. The Pierre Shale directly underlies the sand and gravel deposit on the property. This geologic unit is well known for its relative impermeability and is a very suitable bedrock for impounding water. Itis recogneed that the DRMS has a policy whereby a financial warranty for a slurry wall can be submitted at 20% of the value of the slurry wall provided that detailed engineering design plans are submitted. The applicant currently does not have such plans and won't until an end-user of the reservoir is known.At that time,the plans will be developed. It is proposed that the financial warranty be increased by $412,800 (which is 20% of the cost of constructing the slurry wall) and that a Technical Revision be submitted when an end user is known and they have designed the slurry wall. The applicant commas to a slurry wall design that meets or exceeds the specifications of the DRMS and the State Engineer's Office. St.Barbara Sand and Gravel Mine 10031 Pete Lien&Sons.Inc. May 16,2024