C. Foundation stabilization for pipe and utility structures.

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1 PART 1 - GENERAL 1.1 SECTION INCLUDES A. Excavating, backfilling, and compacting for utilities, including pipe, structures, and appurtenances. B. Control of water in trenches. C. Foundation stabilization for pipe and utility structures. D. Pipe bedding for pipe and utility structures. 1.2 RELATED REQUIREMENTS A. Section Earth Moving B. Section Storm Drainage Utilities 1.3 REFERENCES A. WSDOT Standard Specifications Washington State Department of Transportation Standard Specifications for Road, Bridge, and Municipal Construction, B. City of Port Townsend Design Standards. C. City of Port Townsend Engineering Construction Standards. D. ASTM D-422 Method for Particle Size Analysis of Soils. E. ANSI/ASTM D1557 Test Methods for Moisture-Density Relations of Soils and Soil-Aggregate Mixtures Using 10-pound Rammer and 18-inch Drop. F. ASTM C94-86 Ready-Mixed Concrete. G. AASHTO T176 Plastic Fines in Graded Aggregates and Soils by use of the Sand Equivalent Test. H. ASTM D2922 Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth). I. ASTM D3017 Test Methods for Moisture Content of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth). 1.4 DEFINITIONS Port of Port Townsend

2 A. Unsuitable Material: Soil, organics, waste, or other material not complying with these specifications, not capable of supporting foundations or structures, or not capable of compaction to specified density. Old fill soils and buried top soils are unsuitable. B. Pothole: Exploratory excavation to uncover buried utility, structure, or other feature to determine location, elevation, size, and type of material. 1.5 SUBMITTALS A. Quality Assurance/Control Submittals: 1. Test Reports: Sieve analysis for each material. 2. Certificates: WSDOT pit certification for each pit. 1.6 QUALITY ASSURANCE A. Qualifications: 1. Surveyor: Experience on similar projects. 2. Construction Crew Foreman: Minimum six years working experience and four years experience as foreman performing similar work. B. Regulatory Requirements: 1. Work and material shall be in accordance with WSDOT Standard Specifications. 2. Comply with City of Port Townsend standards. 1.7 DELIVERY, STORAGE, AND HANDLING A. Stockpiling: 1. Stockpile materials on site within construction limits and at locations approved by Owner. 2. Direct surface water away from stockpile site to prevent erosion or deterioration of materials. 3. Remove stockpile and leave area in clean, neat condition. Grade site surface to prevent freestanding surface water. 4. Maintain toe of material at least 6 feet from edges of trenches and excavations. Pile so surface water is prevented from flowing into Port of Port Townsend

3 excavations. Provide free access to fire hydrants, water valves, and meters, and leave clearance to enable free flow of stormwater in conduits, and watercourses. 5. Stockpiles not used or disposed of within seven calendar days shall be covered with polyethylene sheet. 1.8 SEQUENCING AND SCHEDULING A. Sequence work to accommodate normal work activities and use of Site by Owner. Comply with Owner requirements. B. Maintain emergency access, access to service roads, and fire access roads around Site. PART 2 - PRODUCTS 2.1 AGGREGATE MATERIALS A. Backfill Material for Pipe: Crushed Surfacing Base Course per WSDOT Standard Specifications Section (3). B. Foundation Material: Crushed Surfacing Base Course per WSDOT Standard Specifications Section (3). Foundation and bedding material shall have less than 5% fines. 2.2 SOURCE QUALITY CONTROL A. Tests and Inspection: Provide sieve analysis per ASTM D422 for each material type. Perform tests and analyses of aggregate material per WSDOT Standard Specifications. If tests indicate materials do not meet specified requirements, change material and retest. PART 3 - EXECUTION 3.1 EXAMINATION A. Site Verification of Conditions: 1. Verify survey benchmark and intended elevations for Work are as indicated. 2. Verify erosion control is in place and operating properly. 3. Verify locations and elevations of existing pipes and structures at points of connection and at crossings prior to beginning Work. Pothole, expose pipes, determine invert elevations, verify with design, and inform Owner Port of Port Townsend

4 3.2 PREPARATION A. Protection: 3.3 CONSTRUCTION of deviations affecting design prior to mobilizing crews and beginning construction. 1. Locate existing utilities, avoid damage or disturbance. For aid in utility location call Dial Dig , 48 hours (two working days) prior to beginning construction. There are utilities on site that Dial Dig will not locate. Employ and pay for locator service to locate and mark utilities in addition to DIAL DIG service. 2. Protect and maintain existing utilities that are to remain. 3. Protect benchmarks and existing structures. 4. Use means necessary to prevent erosion of freshly graded areas during construction or until such time that permanent drainage and erosion control measures are fully operational. A. Grade and Alignment: 1. Identify and set required lines, levels, contours, and datum. 2. Stake alignment and grade and construct in locations shown on Drawings. 3. Establish extent of excavation by area and elevation. 4. Adjust alignment and grade to accommodate conflicts and field conditions. Obtain Owner s approval prior to adjustments. B. Utilities And Structures, Shoring and Bracing of Excavation: 1. Provide sheeting, shoring, and bracing in accordance with state and local codes. Shoring shall be designed by Contractor. 2. Do not use horizontal strutting below pipe barrel. 3. Do not use pipe as support for trench bracing. 4. Do not remove shoring below top of pipe. 5. Backfill immediately following removal of shoring and bracing. Port of Port Townsend

5 6. Support adjacent structures, including utilities and pipe chases, that may be damaged by excavation Work. C. General Excavation: 1. Perform excavation of every description and whatever substance encountered to depths, lines, and grades indicated. 2. Pile trench excavated material so surface water is prevented from flowing into excavation and there is minimum inconvenience to Owner s access to buildings. Provide access to fire hydrants, water valves, and meters, and leave clearance to enable free flow of stormwater in conduits and watercourses. 3. Remove and reconstruct utilities as required to perform Work. 4. Prevent movement of soil in areas supporting underground utilities or structures. 5. Hand trim excavation and leave free of loose matter. 6. Correct unauthorized excavation at no cost to Owner. 7. Schedule Work to include backfilling trenches by completion of each shift. D. Trench Excavation: 1. Unless otherwise indicated, open cut excavations. 2. Exercise caution in operating heavy equipment over pipelines. Do not damage existing improvements. 3. Repair leaks or breaks caused by construction operations immediately at no cost to Owner and in manner acceptable to Owner and utility owner. 4. Control side walls of excavation to minimize caving. 5. Excavate trench bottom to lines and grades shown with proper allowance for pipe thickness and pipe bedding. Do not permit material containing rocks or cobbles larger than 2-1/2 inches in maximum dimension within 6 inches of pipe. Remove material of this type from trench bottom and replace with foundation material. Port of Port Townsend

6 6. Should excavation be carried below lines and grades as shown because of trenching operations, backfill such excavated space to proper elevation as directed by Owner, at no cost to Owner. E. Stockpiling Trench Excavation Soil Material: Stockpile trench excavation material in area as coordinated with Owner. F. Control of Water: 1. Ground water should be expected during excavations. 2. Keep excavation free from water. Dewater as necessary. 3. Direct drainage away from excavation. 4. Grade top perimeter of excavation to prevent surface water from draining into excavation. 5. Direct runoff and water from dewatering into sedimentation filtration. Provide additional filtration necessary to prevent silt-laden water from leaving site. G. Pipe Bedding: 1. Place bedding on approved trench bottom before pipe is installed. Spread smoothly to support pipe uniformly. Do not use blocking to adjust pipe to grade. Dig holes for bells as required to ensure uniform support along pipe barrel. 2. Compact bedding as follows: Compact bedding to at least 95 percent maximum density as determined by ASTM D1557. H. Backfilling: 1. Backfill to grades, contours, levels, and elevations and with material as shown on Drawings and as specified. 2. Do not backfill over wet, frozen, or spongy subgrade surfaces. 3. Place and compact backfill materials in continuous layers not exceeding 6-inch loose lift thickness when using hand equipment and 12-inch loose lift when using heavy compaction equipment, such as hoe-packs. Decrease lift thickness as needed based on compaction test results. 4. Employ placement method that does not disturb or damage utilities in trenches. Port of Port Townsend

7 5. Condition backfill within plus or minus 3 percent of its optimum moisture content so specified compaction can be attained readily. Material containing excessive moisture, beyond moisture content for specified density as determined by laboratory compaction tests, shall not be used for backfill. 6. Raise backfill evenly around structures. 7. Finish area to uniform contour to drain properly and grade entire surface to neat appearing surface. 8. Remove excavated on-site soil material and surplus fill material from site to Owner-approved, Contractor-provided off-site waste site. I. Compaction: 1. Minimum 95 percent, within 2-foot vertical of finish subgrade and minimum 90 percent below this level per ASTM D Compact backfill material by towed or self-propelled mechanical compactors in uniform layers not exceeding 12 inches in loose depth. J. Initial Backfill: 1. After pipe has been laid properly and inspected, place and compact initial backfill around pipe to minimum depth of 8 inches over top of pipe. Place initial backfill in lifts of not more than 6 inches in compacted thickness. Bring lifts together on both sides of pipe and carefully work backfill under pipe haunches by means of shovel, vibration, or procedures approved by Engineer. Take necessary precautions to protect pipe from damage or shifting. 2. Subsequent Backfill: Place and compact subsequent backfill material after initial backfill has been placed and approved by Engineer. 3. Reopen trenches where settlement occurs to depths necessary for compaction; refill and compact with surface restored to grade at no cost to Owner. 4. Water settling or water jetting will not be allowed. 3.4 FIELD QUALITY CONTROL A. Obtain required inspections, tests, approvals, and location recording prior to covering or enclosing Work. Port of Port Townsend

8 B. Inspection: 3.5 PROTECTION 1. Comply with Owner requirements. 2. Comply with City of Port Townsend requirements. 3. After completion of trench and prior to placing pipe. 4. After completion of pipe and bedding, and prior to backfilling. A. Protect bottom of excavations from freezing. B. Protect excavated material and excavating foundation (subgrade) from damage due to excess moisture. C. Take precautions to protect soil from excess moisture by such means necessary, including: Construct ditches and swales to intercept surface water; cover stockpiled material; cover exposed trenches; do not expose more area than can be worked and protected; and dewater by pumping. 3.6 CLEANUP A. Dispose of excavated surplus or unsuitable material at Contractor-provided off-site location approved by Owner. B. Remove and dispose of rubbish from Site in accordance with laws, regulations, and ordinances to approved off-site location provided by Contractor. C. Dispose of waste, surplus, and unsuitable materials according to laws, regulations, and ordinances. END OF SECTION Port of Port Townsend

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