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City's Dredging History City's Dredging History 1965-67 - First rrejor ma;ntenance dredging performed at City's cost - Main access channel (Channel 1 ) was dredged to a depth of .9 MLLW - Mechanically dredged by clamshell excavation - Material used to create a mud dike to protect the harbor entrance _ Channel 2 was dredged to -9 MLLW and the marina basin west area to -12 MLLW - Hydraulically dredged _ Material disposed on land and in shallow aquatic area 1,500 feet south of the head of the main channel, thereby creating a srrell mud island _ Concurrent with this maintenance was lhe construction of the small boat lagoon for sailboats Immediately south of the marina - The ClllpS studied the feasibility of federal participation in developmg harbors for tlght-draft vessels under the authority of the Rivers and Harbors Act of 1950 during the late 1950s and 19605 - In September 1964, the Clly of San Leandro submitted a resolution (Reso. 64.234) requesting federal maintenance of our iocally-buill access channels to San Leandro Marina 1970.71 _ Congressional Authorization of the Federal Channel via House Document No. 91-428 in December 1970 (1s1 Congress, 2nd Session) that provided for the rreintenance of four channels In San Leandro " " City's Dredging History City's Dredging History . Main channel (Channel 1 ), 2.1 mile long, 2OO-foot wide main access channel to eight feet deep . Interior access channel (Channel 3), 0.4 mile long, 140 feet Wide, eighl feet deep. whICh serves the main berthing areas . North auxiliary access channel (Channel 2), 0.5 mile long, 100 feet wide, six feet deep, branching from the main channel just outside of and paralleling the north breakwater and ending in a 450 x 150-foot tuming basin, six feel deep . An auxiliary access channel (Channel 41. 0.2 mile long, 150 feel wide, eight feet deep branching to the east from the interior channel just beyond the harbor entrance and following the south side of the south dike 1973 - Congressional authorl~lion for funding the San Leandro channel maintenance dredging mandated that the City provide a disposal site for the Corps's use~ cost to operate and malnteln the disposal site bome by the Ctty _ Clly created the 'Upland Disposal SlIe' (UPS), later to become the Dredge Material Maintenance Site - Channels 1, 2, 3 and 4 dredged loa depth of -6 MLLW at City cosl - First Corps-administered maintenance dredging at City cost It he channel authorization came too late to allow federal fund;ng or the 1973 fiscal yeer) _ Berthing area dredged to a depth of -6 MLLW _ Material pumped to the UPS and later trucked for use at other locations 15 16 City's Dredging History City's Dredging History 1979 _ First federal funding for San Leandro maintenance dredging _ Channels 1, 2, 3 and 4 were dredged to a depth of -6 MLLW at federal cost _ City funds used to fund deepening the southern halves of Channels 1 and 4 to -a MLLW to allow construction access by Easl Bay Dischargers Authority for sanitary sewer outfall pipe _ Malerial pumped to the UPS and laler trucked for use at other locations 1984 _ Channels 1, 3 and 4 were dredged to a depth of -a MLLW at federal cost _ City funded deepening of Channels 1. 3 and 4 from -6 MLlW to- 7 MllW _ Due 10 excessive sedimentation at the first launching ramp and turning basin, the flrsllaunch ramp and Channel 2 were abandoned In lieu of a new (second) launching ramp and channel (ChanneI4a) _ Channel4a was constructed at Clly cost to a depth of.7 MLLW (channel 4A was no! authorized for federal funding 001111992) _ Berthing area dredged to a depth of.7 MlLW at Clly cost _ The salting lagoon was partially dredged to a depth of -7 MLlW at City cosl _ Material pumped to the UPS and later trucked for use at other locations 17 18