4 16 25 WO PB Draft Minutes

3 delaying matters but it is all dependant on whether or not its regulated water. • Other concerns Llewellyn Park had was they felt that the elliptical concrete pipe was accelerating the flow of water. The applicant is going to remove the concrete pipe at their request and that Collier has designed a substitute that met with the agreement of Llewellyn Park’s engineers. • The agreement has been signed by the applicant and was submitted to the Planning Board Secretary. • The engineer, Jesse Cokeley, entered on the record, he was sworn under oath, and his credential were accepted by the board. He testified to the following: • Mr. Cokeley had discussions with Mr. Scott keeping him apprised of the developments as they were happening that they were approaching in agreement and would be sharing exhibits. • Ms. Triolo stated they weren’t withholding anything until the meeting this evening that the agreement and the terms and the engineering for the agreement were completed this afternoon and were submitted as quickly as they had them. • Mr. Cokeley presented the exhibit A1 that is the grading and drainage plan from their preliminary and final major site plan set that was previously submitted and reviewed but it has a colorized overlay with the proposed modification to the plan. • There is a blue rectangle in the middle that is overlaid on top of the proposed subsurface infiltration basin. The blue rectangle represents the revised limits of the system so it got smaller based on updated calculations that their office ran following the geotechnical testing that was requested by the board and was performed on February 17th. • It also reflects the calculations taking into account the land cover at the site in a pre 2004 condition when there was no impervious cover. • Another thing that was discussed was the intent to re-establish vegetation on the property. What they did with the colorized version of the map was indicate the driveway was going to be replaced with the pervious pavers that was previously testified to. • The manila part of the map is the previously installed landscape areas. The brighter yellow part of the map is proposed landscape area, some additional area around the perimeter of the building and the rear. • The lighter green part of the map is going to be lawn area, typical grass lawn will be maintained for the use by the applicant. • The darker green

around the perimeter of the building and the rear. • The lighter green part of the map is going to be lawn area, typical grass lawn will be maintained for the use by the applicant. • The darker green part of the map at the rear of the property in between the 2 tier walls in the corner and wrapping around the side and extending up is going to be a proposed groundcover mix of ¼ annual ryegrass seed, ¼ creeping red fescue seed, ¼ perennial ryegrass, and ¼ of white clover seed. • This mix was strategically placed at the rear and will be left in a groundcover state. It is a more robust vegetation and that is to provide additional stabilization in the lawn area to help prevent future erosion. • One of the main requests of Llewellyn Park is to remove the elliptical pipe that was installed as a replacement for the clay pipes. They have agreed to remove that and replace it with a rip rap line ditch that will also include stone check dams that will act as a storm water velocity reducing measure. • They have also agreed to double the size of the previously proposed scour hole at the end of the ditch before the water goes down the hillside. • They have agreed to increase the limits of the ground cover. They were showing some lawn below the second wall, not all the way up to the property line, but they increased the dark green groundcover in that area.