2007-11-27_INSPECTION - M1982015

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(Page 2) MINE ID # OR PROSPECTING ID # M-1982-015 INSPECTION DATE 11/02/07 OBSBRVATION3 INSPECTOR'S INITIALS ESC This was surety reduction request (SR-O1) inspection of the St. Vrain Lakes Site conducted by Erica Crosby of the Colorado Division of Reclamation, Mining and Safety. Brad Davis of Carma Bayshore LLC was present during the inspection. The site is located less than one mile north of Firestone in Weld County, Colorado. The site is immediately north of the St. Vrain River and immediately east of Interstate 25. The surety reduction request was received by the Division on October 16, 2007. The approved postmining land use is developed water resources. The site has been lined with a bentonite slurry wall to prevent the migration of ground water into the pit. Carma Bayshore provided the Division with a letter from the Office of the State Engineer documenting that the slurry wall has passed the design standard for the States lining criteria referenced in the August 1999 State Engineer Guidelines for Lining Criteria for Gravel Pits. In addition to the completion of the slurry wall, the operator has also backfilled and graded the site, replaced topsoil, installed the required rock armored spillways, armored adjacent to the St. Vrain River and installed a perimeter drain. The remaining task includes retaining a portion of reclamation bond for the perimeter drain and revegetation of the site. The operator estimates $115,545.00 shall be held by the State for future reclamation liabilities. Based on the site inspection and review of the file, the Division will approve the acreage reduction request. Notice of approval will be submitted under separate cover. The Division made note of the following items during the inspection, some of which require action by the operator; o Carma Bayshore stated that QaQc specifications will be submitted to the Division prior to construction (7/31/06 letter). During the inspection, Carma Bayshore provided the Division with "as-built" drawings of the slurry wall and the letter from the State Engineer documenting that the slurry wall has passed the design standard for the States lining criteria referenced in the August 1999 State Engineer Guidelines for Lining Criteria for Gravel Pits. o Carma Bayshore committed to submitting an "as-built" certification prepared and sealed by a professional engineer within 60-days of completion of the embankment stabilization indicating that the work has been performed with the approved designs. The operator provided this certification to the Division on November 20, 2007. o During construction of the slurry wall, a pipeline was damaged that resulted in the release of 46,200 gallons of gasoline. The incident was reported to the EPA and the CDPHE (Colorado Spill Incident No. 2006-1029). Emergency response activities conducted by Rocky Mountain Pipeline (RMP). RMP excavated and disposed of 468 cubic yards of petroleum-impacted soils and disposed of the material in approved landfills. Approximately 1,200 gallons of petroleum-impacted groundwater was pumped from the excavation and treated on site in frac tanks for disposal at the Arvada Treatment Center. A groundwater monitoring plan is currently in place (as required by the CDPHE) to remediate petroleum impacts in groundwater and a final closure if remediation is successful. Rule 3.1.13 of the Construction Materials Rules and Regulations require that the operator notify the DRMS within 24 hours of the time the spill is reported to any other agencies with jurisdiction of the spill and include information regarding the spill. The operator provided the Division with the Integrated Corrective Action Plan and its Addendum on November 20, 2007. Rule 3.1.6 states that disturbances to the prevailing hydrologic balance of the affected land and of the surrounding area and to the quality of water be minimized. The operator will need to incorporate the spill remediation plan and the groundwater monitoring plan into the DRMS permit as a revision to the permit. See page 4 for corrective action due dates. o Carma Bayshore relocated the Kerr-McGee pipeline as a result of the lining of the slurry wall. A Surface Uae Agreement between Kerr-McGee and Carma Bayshore LLC was executed and a copy was provided to the Division on November 20, 2007.