The Carlisle Mosquito Online

Friday, July 16, 2010

Conservation Commission shorts, July 8

Greystone pathway. The Conservation Commission (ConsCom) approved a request from Stamski and McNary engineer George Dimakarakos to change the surface on the Greystone Crossing pathway under construction along Cross Street to “bituminous concrete” (asphalt).

The Greystone project is a 15-lot conservation cluster on 47.3 acres. The pathway begins near the junction of Cross and South Streets, winds in and out of the woods, includes several boardwalks over wetlands, and ends at Trillium Way near Bingham Road.

Conservation Administrator Sylvia Willard said there had been difficulty finding a contractor willing to apply the originally proposed “crushed aggregate” permeable surface, in part because it is a proprietary material. Commissioner Tom Brownrigg noted that he had found the aggregate surface uncomfortable to walk on. Willard recalled that one reason the aggregate was proposed was that it would be easier to repair.

Hanover Hill wetland restoration. David Crossman of B & C Associates discussed revegetation of a damaged wetland in the 35-lot subdivision off Westford Street. Over four inches of rain from a storm in early September 2008 led to the collapse of a partially constructed detention basin on the west side of Hanover Road. A large quantity of silt was washed from the unfinished dirt roadway and drainage structure and deposited over 100 feet away in the wetland. Over half an acre was estimated to be covered in places with six to eight inches of silt. (See “Wetlands damaged when storm pummels Hanover Hill,” Mosquito, October 3, 2008).

The silt was removed and a restoration plan developed. There was agreement to wait a year to see if the wetland naturally revegetated without replanting. Crossman said: “Unfortunately, it didn’t come back very well at all.” The area was then replanted last fall and those plants have done well. Some of the herbaceous vegetation has also re-established.

Willard indicated that much of the area is now well vegetated, though one portion along a cart path is bare, “baked mud.” The board agreed with Willard’s recommendation of sowing a wetland “conservation mix” of seeds this fall and that they would then consider the restoration complete.

125 South Street. The ConsCom approved a permit for continued cleanup of 150 gallons of home heating oil that leaked from a broken pipe running from a basement tank to a swimming pool heater. The spill was discovered in April.

Paul McManus of EcoTec, representing homeowner George Lohrer, indicated that the excavation of contaminated soil has been completed. This was allowed under a “friendly” Enforcement Order after a time-limited Emergency Certificate expired.

McManus said there are both human health and ecological standards to be met before the cleanup is complete. Though no one’s well water has been contaminated, ground water must meet state Drinking Water Standards. McManus said that the Licensed Site Professional on the project, Cosmo Gallinaro from Common Sense Environmental, obtained agreement from three abutters on Fifty Acre Way to do any necessary remediation on their property. Affected areas will be treated to remove remaining dispersed oil and ground water will be monitored for a year.

879 Concord Street. Homeowner Linda Taylor met with the ConsCom to discuss the Enforcement Order that had been issued relative to unpermitted removal of vegetation in a wetland resource area and its 100-foot buffer zone. The clearing took place along Buttrick Pond to create access to a four-acre portion of the property that Taylor has put on the market. At Taylor’s request the ConsCom planned a site visit prior to proceeding. The matter was continued to July 22 at 8:30 pm.

98 Wolf Rock Road. A Certificate of Compliance was issued for a project to upgrade a sewage disposal system on the former Hofsteader property. This closes out the project.

Other business. Peter Burn was elected Vice Chair of the Commission. Kelly Guarino had become Chair on July 1. Liz Carpenter and Debbie Geltner were re-appointed to the Land Stewardship Committee for three-year terms. ∆

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