1300 W MARINE VIEW DR 2018-01-19

SECTION 7-093 OF THE STANDARD SPECIFICATIONS IS SUPPLEMENTED BY THE FOLLOWING: 7-09.3 Construction Requirements A minimum of 5 feet horizontal and 12 inches vertical separation shall be maintained between potable and non-potable conveyance systems- 7-09.3(7) Trench Excavation All material removed to construct trenches, including asphalt concrete, support surfacing, and trench material shall be considered as unsuitable for reuse. Unsuitable material shall be removed from the project and disposed of at locations secured by the Contractor at his expense. Disposal of unsuitable materials shall not result in erosion or pollution of wetlands, mud flats, or waterways. 7-09.3(7)A Dewatering of Trench Dewatering shall consist of the design, furnishing, installation, operation, maintenance and removal of a dewatering system to achieve completion of all work performed under this Contract without damage to adjacent facilities, improvement and materials. Historical geotechnical information is available for inspection at the Engineer's office. Actual field conditions may vary and the information should be used as a starting point for designing dewatering approaches. Three (3) copies of the Contractor's proposed dewatering system shall be submitted to the Engineer for review at least 14 days prior to starting the work. The Contractor shall furnish, install, operate and remove any and all additional machinery, appliances and equipment necessary to keep excavation free from water during construction. The Contractor shall dewater and dispose of the water so as not to cause injury to public or private property, or to cause a nuisance or a menace to the public. The Contractor shall, at all times, have on hand sufficient pumping equipment and machinery in good working conditions for all ordinary emergencies, including power outage and flooding, and shall have available, at all times, competent workers for the continuous and successful operation of the dewatering and monitoring systems. The Contractor shall be responsible for and shall repair any damage to work in place, Contractor's equipment, and the excavation. Damage to the excavation includes damage to the bottom due to heave and removal of material caused by pumping out of the excavated area. This may result from negligence, inadequate or improper installation, or inadequate maintenance and operation of the dewatering system, or may result from any mechanical or electrical failure of the dewatering system. Where applicable, the dewatering systems shall not be shut down between shifts, on holidays, weekends, or during work stoppage without written permission from the Engineer. The control of groundwater shall be such that softening of the bottom of excavations, or formation of "quick" conditions or "boils" during excavation shall be prevented. Dewatering systems shall be designed and operated so as to prevent softening of the bottom of excavation, quick conditions, or boils at all times ' and under all conditions. Excavations shall be kept practically free of water during excavation, construction of structures, installation j of piping, placement of gravel working base, and structure and trench backfill. Surface runoff shall be controlled so as to prevent entry or collection of water in excavations or in other isolated areas of the site. The dewatering system shall be designed using accepted and professional methods of design and engineering consistent with the best modern practice. The dewatering system shall include any deep wells, wellpoints, sumps and other equipment, and related earthwork necessary to perform the function. Acceptance of the submitted dewatering system shall not relieve the Contractor from the responsibility for adequate design and performance of the system in controlling the water level in the excavated areas. The Contractor shall be solely responsible for the proper design, installation, operation, maintenance and any UP3220-Div_7 Page SP 7-2 / June 15,2005