pf_02890 - Laserfiche WebLink

Home

JJJ .NSP PROPOSAl. 3.1 NSP proposes to operate the portable grinder on the site up to six times per year to grind wood/vegetation into wood chips for re-use by residents. The wood comes from NSP utility trimming operations. The wood trimmings would be stockpiled between grinder visits. 3.2 The grinder would be on the tree site for 8-12 hours per time. 3.3 NSP estimates the decibel level at 82 when the grinder is in operation. A front-end loader is used to load the grinder. Two employees are on site at all times. 3.4 Provision is being made for city or resident use of the site. 3.5 The nearest NSP grinder site to Roseville is at the St. Paul Campus of the university. 3.6 The estimated production per grinder hour is 45 tons - up to 500 tons per day. 3.7 Ramsey County loaders and trucks would move the material to distribution sites away from the grinder operations site. Up to ten NSP contractor trucks could be temporarily parked on the site. Worker's personal vehicles could also be parked on the site. 4Jl STAFF COMMENT 4.1 Review the video and background information regarding the machinery. 4.2 Stockpiling of materials should be closely monitored or be closed to the public to reduce possible injury or fires. Gates or fencing may be an acceptable solution. 4.3 The grinder machinery noise is high (82 decibels). The applicant must assure the MnPCA standards for daytime use can be met. For comparison, a jet airplan is 110- 120 decibels, a rock concert is 105 to 110 decibels, background interstate traffic noise is 62 to 65 decibels. 4.4 As is the case during snow removal periods, the moving, feeding and removal of the final product (chips) may also cause noise due to county loading and hauling equipment and back-up warning systems. 2