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M_ t9~P~-o~Z- ~ LAFARGE NORTH AMERICA AGGREGATES, CONCRETE & ASPHALT ~ May 25, 2005 Doug llcenberry ' CDPHE-HWMWD 4300 Cherry Creek Drive South Denver, CO 80246-1530 MAY 2 b 2;05 Division c; P.~~ ::. ~ ~• Re: ~" Reported Diesel Spill of May 12, 2005 CDPHE Spill Response #2005-273, NRC #758483, DMG notified (no report # provided) Dear Mr. Ikenberry, This letter serves as a written summary within 30 days of the incident reported by telephone on May 12, 2005 to the State of Colorado Department of Public Health and Environment, the National Response Center, and the Colorado Division of Minerals & Geology. On May 11's, 2005 at approximately 4:35 pm, a front end loader had a hydraulic line break within our Cottonwood Aggregate facility, located at 2002 Weld County Road 20.5 in Longmont, releasing approximately 85 gallons of hydraulic oil. The material was contained on site by using approximately 102 tons of crusher fines to absorb the spilled material. The absorbent material was excavated, along with approximately 480 tons of soil that was also potentially affected by the spill. All of the excavated material was relocated to Lafazge's Stromquist Asphalt plant (located adjacent to the Cottonwood Pit) where it will be run through the plant to make hot mix asphalt. All spilled material was contained on site and no potential impacts to ground or surface water were observed. Oil-only booms were placed before the closest mine dewatering pump area as a precautionary measure but no sheen has been observed. The entire azea where the spill occurred will be mined within the next eight months for sand and gravel deposits. Soil samples were taken in the excavated area and the only detectable amount was 260 ppm for motor oil, which is below the Oil Inspector Section risk based analysis screening level for TPH less than 500 ppm (lab results enclosed for your review). There was no evidence that surrounding soils were negatively impacted as the excavations were more than adequate to capture potentially affected areas. The oil did not enter a waterway, ditch or storm sewer, and it did not contact any surface water bodies or ground water. Lafarge is aware of its responsibility to protect the environment and believes that an appropriate response was taken to minimize the impact of this incident. If you have any further questions regarding this incident, please call me at (303) 657-4148 at your earliest convenience. Si cerely, ^~ V 'Me Nulty Env' ental Manager CC: CR Herro -Lafarge Denny Ellsworth -Lafarge Tammy Stevens -Lafarge file Kevin Moore - Lafage Jo iar^h-Lafarge Kathleen Sullivan-DMG ~` LAFARGE NORTH AMERICA INC. 'Aggregate, Concrete, and Asphalt 10170 Church Ranch Way, Suite 200, Westminster, Colorado 80021 Telephone: (303) 657-4000 Facsimile: (303) 657-4037