In geological or hydrological terms, the brackish Petaluma is actually a tidal slough, an arm of San Pablo Bay that extends approximately 14 miles up to the city of 55,000 people. How did such a potential liability, tucked away behind a row of undistinguished office and light-industrial buildings, get turned into a magnet for walkers, joggers, bicyclists, and avian enthusiasts? The story could begin with a bit of river history, except that there isn’t one. Not bad for a park that started life as a dredge spoils site, and continues to be the receptacle for tons of mud dug up from the bottom of the nearby Petaluma River. History buffs can learn about this southern Sonoma County city’s commerce-driven past, and everyone can see a landscape that has been in transition, from better to worse and back again, for over 200 years. Joggers, dog walkers, parents pushing strollers, and bicyclists make their way along the main path, while bird-watchers raise their binoculars to catch a glimpse of a pied-billed grebe diving in search of its breakfast, or to watch a pair of avocets tending their nest. Jack-up pontoons that use their legs for positioning are often designed as modular units which allows them to be transported in standard shipping containers.Even on a weekday morning, Petaluma’s Shollenberger Park is a busy place. Using a centrally controlled hoisting system, the pontoon can also be raised to clear the water level. Their heavy structure allows the full weight of the pontoon and the equipment mounted on it to be carried on the legs. Elevating jack-up pontoons are constructed as a sturdy monohull with strong legs and hoisting systems. Jack-up pontoons have three or more legs that used to either aid positioning or transmit the forces generated by the item of equipment to the ground. placement of windmill foundations at sea.near-shore marine operations including geotechnical site investigation,. In recent years, a wide range of sizes of these jack-up platforms have been built to fulfil a variety of different roles from working close to shore to working in waters of 50 metres depth.įrom smaller jack-ups, which are modular self-elevating platforms, to powerful vessels with 1200 to 2750 tonne pre-load per leg capacity and a crane capacity of 600 tonnes, jack-ups are there for a variety of operations such as:
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