Ground Freezing Sample Clauses

Ground Freezing a. Freeze pipe installation records. b. Ground and groundwater temperature measurements from all installed thermocouples (to commence at least one week prior to start of freezing operations). c. Refrigeration plant operation data during freezing. Include the following: 1) Number of units operating. 2) Coolant temperatures at supply and return lines. 3) Energy consumption. d. Measurements of return coolant temperature from each pipe or grouped series of pipes. e. Coolant manifold pressure and flow monitoring data. f. Brine tank level monitoring data. g. Consumption rate of liquid nitrogen, where used. h. Groundwater monitoring data. i. Ammonia concentration monitoring data. j. Distribution system pressure testing results.
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Ground Freezing. 1. The Contractor is solely responsible for evaluating subsurface conditions that may affect design, construction, and operation of a frozen ground support system, by performing additional drilling, sampling, laboratory testing, and groundwater monitoring. Subsurface conditions that cannot be reliably established from the subsurface investigation performed for this project include, but are not limited to: a. Thickness and lateral extent of gravel layers that may provide a conduit for high velocity groundwater flow. b. Groundwater flow gradients and flow velocities. c. Size and frequency of boulders capable of deflecting or impeding installation of freeze pipes. d. Thermal properties of soil. e. Chemical properties of groundwater in soil. f. Water content of partially saturated soils 2. Design shall incorporate the following criteria: a. Temperature measurement thermocouple devices located throughout the frozen ground mass at a minimum of one device every 350 cubic feet of frozen soil and at all critical locations where relative spacing of the freeze pipes is greatest. b. The freezing system shall be designed to establish a structurally stable excavation, and groundwater cut-off until the permanent structural liner is completed. 3. Structural Liner design shall incorporate the following: a. The design shall specify the factor of safety provided by the structural liner in both fully frozen and fully thawed ground. The structural liner shall be capable of withstanding all earth and groundwater pressures applied in addition to construction loads in both fully frozen and thawed ground conditions.
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Ground Freezing a. Detailed design of the freeze plant system, freeze pipe geometry, distribution manifold, refrigeration plant size and specifications. Include the following: 1) Type of coolant. 2) Size, type, and power capacity of the compressor. 3) Size, type and temperature drop of the chiller/evaporator. 4) Type and expected temperature range of the coolant. 5) Volume capacity of coolant circulation pump. 6) Projected maximum and average operating ranges. b. Manufacturer’s literature for all equipment including shop drawings. Equipment shall include piping as well as refrigeration units, drilling assemblies and other ancillary equipment. c. Plans for monitoring instrumentation placement to assess growth of freeze, temperatures, and state of closure. d. Plans for monitoring impacts on overlying or adjacent utilities, existing structures, completed work and any other property from effects such as ground heave, frost expansion pressure, and freezing temperatures. e. Plans for insulating the frozen soil mass to maintain its integrity during excavation and structural lining installation operations. f. Plans for dismantling and removing the ground freezing system including freeze pipe decommissioning. g. Plans for disposal of refrigeration gas and circulating coolant in accordance with all applicable local, state and federal regulations including the United States Environmental Protection Agency (USEPA) and Washington State Department of Ecology. h. Detailed ground freezing calculations performed by the Designer shall include the following: 1) Detailed numerical analysis indicating the capability of the refrigeration system and manifold to provide flow rates that are sufficient to maintain frozen ground which is safe to excavate to the shaft design depth. 2) Detailed numerical analysis defining design thicknesses for mass of frozen ground required for safe excavation, taking into account both thermal and structural complications, and setting forth volumetric extent of frozen ground that is expected to be required. 3) Estimates of energy required for initial freezing and freeze maintenance phases. 4) Time estimates for freezing and minimum frozen ground thickness required prior to excavating. 5) Heave estimates and control measures. 6) Calculations for frozen soil mass temperature-strength correlation at the shaft site. 7) Calculations demonstrating ground freezing meets strength design requirements for safe excavation including the expected factor of safety. i. Plan for a ...
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Related to Ground Freezing

  • Underground Storage Tanks In accordance with the requirements of Section 3(g) of the D.C. Underground Storage Tank Management Act of 1990, as amended by the District of Columbia Underground Storage Tank Management Act of 1990 Amendment Act of 1992 (D.C. Code § 8-113.01, et seq.) (collectively, the “UST Act”) and the applicable D.C. Underground Storage Tank Regulations, 20 DCMR Chapter 56 (the “UST Regulations”), District hereby informs the Developer that it has no knowledge of the existence or removal during its ownership of the Property of any “underground storage tanks” (as defined in the UST Act). Information pertaining to underground storage tanks and underground storage tank removals of which the D.C. Government has received notification is on file with the District Department of the Environment, Underground Storage Tank Branch, ▇▇ ▇ ▇▇▇▇▇▇, ▇.▇., ▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇, ▇.▇., ▇▇▇▇▇, telephone (▇▇▇) ▇▇▇-▇▇▇▇. District’s knowledge for purposes of this Section shall mean and be limited to the actual knowledge of ▇▇▇▇▇▇ ▇▇▇▇▇, Property Acquisition and Disposition Division of the Department of Housing and Community Development, telephone no. (▇▇▇) ▇▇▇-▇▇▇▇. The foregoing is set forth pursuant to requirements contained in the UST Act and UST Regulations and does not constitute a representation or warranty by District.

  • Underground Tanks If underground or other storage tanks storing Hazardous Materials located on the Premises or the Project are used by Tenant or are hereafter placed on the Premises or the Project by Tenant, Tenant shall install, use, monitor, operate, maintain, upgrade and manage such storage tanks, maintain appropriate records, obtain and maintain appropriate insurance, implement reporting procedures, properly close any underground storage tanks, and take or cause to be taken all other actions necessary or required under applicable state and federal Legal Requirements, as such now exists or may hereafter be adopted or amended in connection with the installation, use, maintenance, management, operation, upgrading and closure of such storage tanks.

  • Underground Facilities All underground pipelines, conduits, ducts, cables, wires, manholes, vaults, tanks, tunnels, or other such facilities or attachments, and any encasements containing such facilities, including without limitation those that convey electricity, gases, steam, liquid petroleum products, telephone or other communications, cable television, water, wastewater, storm water, other liquids or chemicals, or traffic or other control systems.

  • Storage Tanks If storage tanks storing Hazardous Materials located on the Premises or the Project are used by Tenant or are hereafter placed on the Premises or the Project by Tenant, Tenant shall install, use, monitor, operate, maintain, upgrade and manage such storage tanks, maintain appropriate records, obtain and maintain appropriate insurance, implement reporting procedures, properly close any storage tanks, and take or cause to be taken all other actions necessary or required under applicable state and federal Legal Requirements, as such now exists or may hereafter be adopted or amended in connection with the installation, use, maintenance, management, operation, upgrading and closure of such storage tanks. Notwithstanding anything to the contrary contained herein, Tenant shall have no right to use or install any underground storage tanks at the Project.

  • Irrigation An irrigation reduced pressure zone (hereinafter referred to as “RPZ”) is required for any irrigation systems and must be installed by the Developer and/or eventual lot owner and tested in accordance with the Minnesota Department of Health Guidelines for Designing Backflow Prevention Assembly Installations (hereinafter referred to as “Guidelines”). The initial test results and certification shall be submitted to the City of Maple Grove Public Works Department. Subsequently, the RPZ must be tested, per the Guidelines, at least annually by a certified tester with the results reported to the City of Maple Grove Building Department and the RPZ must be rebuilt as needed in accordance with the Guidelines. Test/rebuilt reports shall be mailed or faxed to the City of Maple Grove Building Department at (▇▇▇) ▇▇▇-▇▇▇▇. The irrigation system shall be designed and the Plans shall be modified accordingly, prior to the issuance of any permits for the development of the Property, to accommodate a 1-inch water meter and a maximum flow of 50 gallons per minute.