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Notification #1600-2018-0342-R3 Streambed Alteration Agreement October 28, 2019 Page 2 of 24 2. Construction of an approximately 800 -foot long gated fixed cellular sheet pile wall over the course of two years to isolate Atherton Cove and Smith Canal from the San Joaquin River during high flow and tide events. 3. Installation of approximately 1,660 linear feet of single -sheet sheet pile wall embedded within Dad's Point, where a concrete cap will be installed on top of wall in areas where it is exposed; 4. Placement of fill materials in areas to raise the elevation of Dad's Point; 5. Grading the crown of Dad's Point and construction of an 8 -foot -wide all-purpose road and a 12 -foot -wide concrete paver trail. 6. Construction of a temporary cofferdam and dewatering of the area where the gated fixed cellular sheet pile wall will be installed; 7. Dredging of up to 8,650 cubic yards in the footprint of the fixed cellular sheet pile wall; 8. Installation of sixty-four concrete -filled steel pipe piles, approximately 36 inches in diameter for gate construction, 9. Forming and pouring of an approximately 69 -foot wide, 69 -foot long, and 6 -foot thick reinforced concrete floor and two approximately 71.25 -foot long, 22 -foot high, and 6 - foot thick gate structure walls; 10. Installation of thirty-six 36 -inch steel pipe dolphin piles on the San Joaquin River side of the wall for protection from boats and two fender piles on both the San Joaquin River and Smith Canal sides of the gate structure to provide support for the concrete floor and walls fitted with solar -powered light -emitting diode navigation lights; 11. Placement of approximately 4,200 tons of riprap along the banks where the wall ties into the banks and around the edge of the gate structure; 12. Installation of two fishing/wildlife viewing platforms on the river -side of Dad's Point approximately 36 feet wide by 12 feet deep placed on 24 -inch diameter steel piles; 13. Removal of invasive plant species and replanting with native plants on the banks of Dad's Point. Site Access, Mobilization, and Staging Access to the northern side of the project area will be through a short access easement at the end of Virginia Lane. A permanent access road will be constructed along the alignment of an existing golf cart path between the end of Virginia Lane and the northern end of the fixed wall. Access to the southern side of the project area will be from Monte Diablo Avenue. Materials may also be transported to the site by boat or barge via the San Joaquin River. The Louis Park parking area near the boat launch at the base of Dad's Point is the only identified area that will be used to house construction equipment and mobilize construction activities for the project. 2019 Test Pile Program A test pile program will occur over a period of three days during the 2019 in -water work window. These activities will involve vibratory and impact driving a single 20 -inch steel flat web sheet pile and "H" pile in three separate locations along the alignment of the cellular sheet pile wall across the mouth of Atherton Cove. Driving and removal of each test pile will require the use of up to two barges, and up to 1,000 strikes with an impact hammer on each of the three days. Each test pile would first be vibrated to the maximum depth possible, and then would be driven to its design depth using an impact hammer, if needed. The piles would be monitored for structural stresses during installation, and then each pile would be removed