WP0040203 - Laserfiche WebLink

Home Browse Search

Notification #1600-2018-0342-R3 Streambed Alteration Agreement October 28, 2019 Page 5 of 24 installed at the south end of the fixed wall on Dad's Point and at the north end of the fixed wall at the Stockton Golf and Country Club. The gate will be 8 feet high and will prevent public access to the fixed wall and gate structure. Access to the gate structure through the security gate will be limited to San Joaquin Area Flood Control Agency (SJAFCA) and authorized maintenance personnel. Once construction of the fixed wall is complete, thirty-six 36 -inch steel pipe dolphin piles will be installed on the San Joaquin River side of the wall to protect it from boats, and two fender piles will be installed on both the San Joaquin River and Smith Canal sides of the gate structure. The pipes will be driven using a barge -mounted vibratory hammer or impact hammer, with piles being vibrated to a maximum depth prior to use of an impact hammer. The dolphin piles will be spaced every 16 feet on each side of the gate structure and will be placed approximately 55 feet away from the centerline of the fixed wall. The fender piles will have a floating fender that will move up and down the pile with the tide, and all four fender piles will have a top -mounted solar powered light -emitting diode navigation light. Planter boxes will be installed along the top edge of the Atherton Cove/Smith Canal side of the fixed wall and will be designed to allow vegetation to hang over the top half of the wall. Construction of the fixed wall will be staggered over 2 years. The southern portion of the fixed wall will be installed during the first year of construction and the northern portion during the second year. Construction of the northern side of the fixed wall will not take place until after the gate structure has been tested to confirm operability. Construction of the fixed wall will be done using barge -mounted equipment. The granular material will be delivered to the construction site by truck or barge using a crane equipped with a clamshell bucket. The Permittee and their contractor will incorporate the use of a pile driving analyzer system during pile driving, which monitors the energy of the hammer blows into the piles, essentially conducting dynamic load testing during pile driving. A single compression pile load test would be conducted once the piles are installed, which does not require additional impact hammer strikes. Prior to driving any pile, the Permittee or their contractor shall submit a pile Wave Equation Analysis, performed by an engineer, for each size pile and distinct subsurface profile condition to CDFW. These analyses shall take into account the proposed hammer assembly, pile cap block and cushion characteristics, the pile properties and estimated lengths and the soil properties anticipated to be encountered throughout the installed pile length based on static capacity analysis with consideration of driving gain/loss factors. Only one specific model of pile hammer may be used for each pile type and capacity. The Wave Equation Analysis shall demonstrate that the piles would not be damaged during driving, shall indicate that the driving stresses would be maintained within the limits below and indicate the blow count necessary to achieve the required ultimate static pile capacities. Riprap Placement Once the fixed wall is constructed, approximately 3,400 tons of riprap will be placed where the wall ties into the banks, and an additional 800 tons will be placed around the edge of the gate structure, for a total of 4,200 tons. The wall tie-ins are designed to be stable, but the riprap will be needed for scour protection during flood events. At the tie-in with the Stockton Golf and Country Club, the riprap will extend along the bank from both the Smith Canal and San Joaquin River sides of the wall (Exhibit A). At the opposite end, riprap will be placed along the whole tip of Dad's Point (Exhibit A). The riprap will be placed using either an