12/04/2002 Env Bd Packet - Laserfiche WebLink

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ENVIRONMENTAL BOARD MEETING OCTOBER 30, 2002 This plastic technology reduces the compaction of the soil when cars drive or are parked on it, as noted in the pink areas on the map. The swales were set at one half foot and would go into the infiltration system. He indicated that people were trying to move away from the ponds because it naturally reduces the mosquito breeding areas. Grundhofer inquired about the location of the example Mr. McCully used. Mr. McCully responded that the site was north of Highway 694, East of the railroad tracks, on Berkeley Road. Asleson stated that the question that could not be answered was the seasonally high water level and groundwater elevations on the west side. Mr. McCully answered that the borings were done by Braun Engineering and found that the elevation was 897 feet, with the groundwater at 890 feet and 894 feet. There were no borings on the West side, however. Chair Kukonen commended him on the innovative techniques he was proposing, but he expressed concern about aquifer contamination. Mr. McCully responded that the runoff would go through filters and swales. Grundhofer stated that the summer storms this year produced a lot at once. Mr. McCully indicated that the system could absorb 6 inches to 14 inches in an hour. Asleson inquired about the movement of water during the high water level. Donlin asked for clarification concerning the contents of the gravel. Mr. McCully answered by pointing out the black lines on the map. He stated that it was not a swale, but a slope that would reduce the impervious. The area would be used for overflow parking or driveway. In the winter months, snow would be stored there. Donlin indicated that the Board had been supportive of innovations, but expressed concern over the aesthetics. The area would quickly be exposed to cottonwoods and other seeds attempting to take root. She questioned how they would deal with the issue. Mr. McCully answered that they find the cleanest rock available, and it would be a gray color. He believed the details of the plan he had submitted should dispel all concerns. Donlin asked about the use of herbicides, and questioned the ability of the bacteria to inhibit weed growth. She discouraged the use of pesticides. McCully clarified the two systems. The Netlawn would be used in the grass surface in the swale. The areas of the map depicted in pink would have Flexpave 50 and did not have the organic layer, which would greatly reduce the ability of the weeds to take root. He believed the two systems qualified for public value credits, because they met every requirement on the list. DRAFT MINUTES