Laserfiche WebLink
Mr. Joe Lamanna <br /> November 11, 2016 <br /> Page 4 <br /> • In the transmission trench portion of the underdrain system, geofabric material shall be <br /> installed before the addition of any gravel material to allow for the installation of the <br /> geofabric material around the gravel pack. <br /> • Backfill trench with gravel material to approximately 1 foot below the ground surface. <br /> • Install geofabric on top of collection and transmission trench areas. <br /> • Backfill remainder of trench with compacted native overburden and clay material to the <br /> original ground surface elevation. <br /> • At the upgradient portion of the underdrain system,a clean out access port shall be installed <br /> that terminates at the ground surface which will be covered with a manhole access. <br /> -Discharge Outlet Installation <br /> • Install a discharge structure at the outlet of the underdrain structure to protect the McCann <br /> Ditch from erosion and the structure from tampering. <br /> We hope that this letter provides you with the information you need to direct your contractor in <br /> the construction of the designed Spier Property underdrain system. If you have any questions, <br /> comments or need any additional information,please do not hesitate to call. We are also available <br /> to communicate directly with your contractor to address any informational needs associated with <br /> the project. <br /> Very truly yours, <br /> BISHOP-BROGDEN ASSOCIATES, INC. <br /> -7 a <br /> Timothy A. Crawford, P.G. <br /> Senior Project Manager/Hydrogeologist <br /> TAC/jeb <br /> Enclosures <br /> 0430.09 <br /> II <br />