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The proposed new drainage ditch on the south side of Murray Drive to be constructed by the City of Chesapeake should have little to no impact on the ability of the drainage ditch on the south of the golf course to accept contaminants from the site.
Once a plume of contaminants develops in the groundwater, drought conditions must be severe and prolonged to alter the flow of groundwater in a manner sufficient to impact the ability of the drainage ditch to accept contaminants moving south of the ditch.
The report says that it used the construction drawings to determine the location of the fly ash on the site. The construction drawings do not show the actual location of the fly ash. This has led to some confusion about the reliability of the conclusions in the report.
The most important data regarding the fly ash is the amount (approximately 1.5 million tons) and the general distribution. Since we used a distribution pattern which covered the width of the golf club, the model should be accurate and scientifically reliable without knowing the exact locations. The anomaly found in data results from the southwest corner of the site may be explained by the hills on that corner which may contain fly ash.
At this time we have no data indicating the ditch is contaminated. As a plume develops under the golf club, it is likely contaminants will drain into the ditch which will become contaminated. However, it is difficult to determine at this time whether contaminants will reach a detectable level in the ditch.
CDM examined the golf club site and the neighborhoods directly south and east because of the general direction of groundwater flow in the area and because the ditch to the south should act as a barrier to contaminants moving away from the site via groundwater flow.
Public Works' project schedule: