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In response to recent public inquiries into the County’s surface-water management practices at the Newland Park Landfill on Brick Kiln Road, the County asked Geosyntec Consultants (Geosyntec) to perform an audit of the surface-water quality monitoring program at the landfill site. Geosyntec, located in Columbia, Maryland, is an earth sciences consulting firm that specializes in landfill engineering and environmental quality assessments. Geosyntec has provided such services at over 20 different landfills in Maryland over the past 18 years, including the Newland Park Landfill, where Geosyntec has been implementing groundwater and landfill gas monitoring programs at the landfill for many years.
Surface-water quality at the landfill site is being monitored by the County in accordance with the requirements of the National Pollutant Discharge Elimination System (NPDES) permit program, which is administered under the Federal Clean Water Act. The Newland Park Landfill currently holds two separate NPDES permits. One addresses surface-water quality in relation to landfill activities and the other addresses surface-water quality in relation to the landfill’s on-site borrow source. As required by these permits, water discharged from the landfill and the borrow source to surface-water features is sampled monthly by landfill employees for the parameters defined in the State-issued NPDES Permit. Geosyntec reviewed the laboratory test results of surface-water samples collected by landfill personnel dating back to 2003 and evaluated the results for compliance with the requirements of the NPDES permits. The data show that surface water leaving the landfill site has a nearly neutral pH, is free of suspended soils, and has a temperature similar to that of the water in the receiving stream. These sample results indicate that the facility is currently in compliance with the requirements of the NPDES permit, although over the years a few results have been slightly outside of the required range (but within about one percent of the normal value). Geosyntec’s finding is consistent with the findings of the Maryland Department of the Environment’s (MDE’s) surface-water evaluation of the site in March 2008, which confirmed that the site is in compliance with the requirements of the permit.
Based on the review of the surface-water quality data that Geosyntec was provided, Geosyntec concludes that surface-water quality complies with the requirements of the NPDES permits.