SUNDAY METROWEST DAILY NEWS COVERAGE: Read tomorrow's investigative report on pollution from a century of oil spills along a mile stretch of commercial and residential properties in Marlborough, Mass. Toxins from those spills rest uneasily in a pair of state-owned ponds, mingled in massive silt deposits that pose a threat to the nearby Sudbury Reservoir.
AGING INFRASTRUCTURE: There are two state-owned Department of Conservation and Recreation ponds in the tributary to the Sudbury Reservoir that runs along Maple Street. A concrete-and-earthen dam, which was built more than a half-century ago, has a main spill way and floodgate spillway. /Christopher Cheney photo
An oily ooze was recently observed leaking from the dam's floodgate spillway to the dry floor of the main spillway. /Christopher Cheney photo
CONTAMINATION CONDUIT: A concrete aqueduct connects the dam's main spillway to the Sudbury Reservoir, which is a quarter-mile downstream of the dam. /Christopher Cheney photo
An outflow pipe in the dam's main spillway aqueduct spews an oily substance. /Christopher Cheney photo
TERMINUS POINT: The dam's aqueduct discharges into the Sudbury Reservoir in Southborough. /Christopher Cheney photo
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