This report is not available online. You may request a copy by emailing Mr. Terry Siviter at Americast or by calling (757) 652-9526.

Summary: Eight synthetic storm tests were performed in each of the two tanks provided by Americast. Two different mixture media consisting of coarse sand, fine organic sand and organic were packed into the two tanks. Two (2) inches hardwood mulch was added on top of and completely covered the mixed media filter. One Viburnum davidii was planted in each tank for the final five tests in order to study the effect of plants on pollutant removal. The media filter system shows good removal for all pollutants tested. The water quality results, averaged for each tank, are as follows:

• Total phosphorus: 46.5% for Tank 1 and 57.5% for Tank 2
• Orthophosphate: 48.1% for Tank 1 and 56.3% for Tank 2
• Total nitrogen: 51.4% for Tank 1 and 44.7% for Tank 2
• Total suspended solids: 72% for Tank 1 and 85.3% for Tank 2
• Copper: 76.4% for Tank 1 and 82.2% for Tank 2

The removal of total phosphorus decreases with the increase of the flow rate, which is consistent with the expectation in the field. The same trend was also observed for orthophosphate. However, no definitive correlation was observed for other pollutants.