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i 1 i • 1 t t May 24, 1974 i Hoard of Appeals Town Office Building Lexington, Massachusetts 02173 Re: 115 Kendall Corporation Hartwell Avenue & Bedford Street Gentlemen: I We have reviewed the site plans for the subject project and • offer the following comments for your review and consideration in this matter. 1. This revision still shows proposed sewer and water ser- vices for lot I coming from proposed sewer and water main exten- sions in Hartwell Avenue. Since this involves expansion of the Towns' sewer and water utility network in the amount of approxi- mately $50,000, it would seem logical that the overall develop- ment picture should be presented in order that the Board of Public' Works (Selectmen) may make sound and rational decisions as to how their system can best be expanded. Once this is accomplished, the logistics of financing and constructing these utilities can be discussed between the developer and the Board. 2. The plans indicate that the public footpath on Hartwell Avenue that leads to Hinchey Road, will be altered to the point where there will be a 33% grade dropping from Hinchey Road to the driveway then climbing back to existing ground on the other side of the drive, also at 33% grade. We believe this gradient to be objectionable. 3. The slope on the 12" R.C. drain leading from the catch basin on the southwest side of the parking lot is too flat. Ab- solute minimum slope for 12" pipe should be .005 in order to maintain self cleaning velocities. 4. The special manhole leading to the retention pond shows 4—I8" pipes in plan view yet the details for both the manhole and the headwall show 4 - 22" x 13" metal arch pipes. This should be clarified. ers • -� is A JOHN'J. McSWEENEV. Dirremr. Public Warts IF.Sineeeiny i 1625 MASSACHUSETTS AVENUE 0 LE%YN OTO N, MASSACHUSETTS 02173 • TELEPHONE (617) 962-0500 NG'c o�