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Specifications RECEIVED GEOTECHINCAL ENGINEERING _ FEB 15 2008 SPECIFICATIONS CITY OF TIGARD BUILDING DIVISION Pacific Crossroads Corporate Center Prepared by: Rapid Soil Solutions, LLC December 10, 2007 0O ,p ED PROF '2\0 Q' 19244 ,9 s OREGON . V 4 ( A HET( F-;/-� I Mia Mahedy- Sexton, PE Section 2100: Site Preparation Section 2200: Earthwork Section 2240: Cement Treated Sub -grade Section 2741: Asphalt Concrete Pavement 2100 Site Preparation 2100 — Site Preparation Section not prepared by Mildren Design Group, PC. It is solely the product of Rapid Soil Solutions. Part 1- General 1 DESCRIPTION OF WORK A. Furnish all labor, materials, equipment and incidentals required to perform all clearing and grubbing as shown in the Contract Drawings, and specified herein and as reasonably inferable there forth. B. Related Sections: Section 2200: Earthwork Section 2240: Cement Treated Sub -grade Section 2741: Asphalt Concrete Pavement 2 REFERENCE STANDARDS AND DOCUMENTS A. Geotechnical Report by Rapid Soil Solutions, LLC dated July 10, 2007. B. Oregon Department of Standard Specifications for Construction (OSSC), 2002. C. Oregon Administrative Rules (OAR) 340 -35 -0035 and 340 -45 -0005. D. American Society for Testing and Materials (ASTM), current edition. E. ASTM D698, Test methods of Laboratory Compaction Characteristics of Soil Using Standard Effort. F. ASTM D2041, Standard test method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures. G. International Building Code (IBC) 2006. 3 SITE CONDITIONS A. Limits of the work Limits of work are identified on the grading and erosion control plans. Work outside the limits of construction is to be completed with proper permission of authorities having jurisdictions. Part 2 — Materials NOT USED Part 3 — Execution Pacific Crossroads Corporate Center 2100 Rapid Soil Solutions, LLC 1 Site Preparation 2100 Site Preparation 1 PREPARATION A. Verification of existing conditions 1. Verify location of all utilities 2. Verify location of survey monuments 3. Verify location of existing landscaping to remain (if any). Provide protective measures if required. See landscaping drawings. 2 CLEARING, GRUBBING AND STRIPPING A. Clearing and Grubbing shall consist of: Removal of brush and tree stems remaining above the ground surface. Removal of tree stumps and or roots greater than %" and other vegetation found below the ground surface. Removal of any partially buried natural or man made objects. B. Backfill of tree stumps and/or basement foundations shall be directed in Section 2200, Earthwork. C. Stripping of extra topsoil from the site can be stockpiled for future landscaped areas provided that necessary erosion control best management practices ( BMP's) are installed around stockpiles: D. Dispose of waste materials and excess topsoil from the site in approved waste disposal sites. E. Install gravel construction entrances as prescribed on grading and erosion control plans. F. Prepare the site for wet weather conditions once clearing and grubbing has taken place using BMP's. 2 COMPLETION A. Restoration of site improvements 1. Restore any damage to existing conditions prior to the start of work. 2. Damages from the Contractor's activities are the sole expense of the Contractor. END OF SECTION Pacific Crossroads Corporate Center 2100 Rapid Soil Solutions, LLC 2 Site Preparation • 1. • • 2200 Earthwork 2200 — Earthwork Section not prepared by Mildren Design Group, PC. It is solely the product of Rapid Soil Solutions. PART 1- GENERAL 1 DESCRIPTION OF WORK A. Furnish all labor, materials, equipment and incidentals required to perform all earth work as shown on the Contract Drawings and specified herein. B. The base bid for structural fill materials will be the native fine grained silt found at the site (excluding stripping) or selective structural fill as found in section 2.1. If the site soils are above their optimum moisture and soil drying cannot be accomplished by any method because of the weather conditions, see Section 2240, Use of Cement Treated Base or Import of Granular Materials in Section 2.1 C. Related Sections: Section 2100: Site Preparation Section Cement Treated Sub -grade Section 2741: Asphalt Concrete Pavement 2 REFERENCE STANDARDS AND DOCUMENTS A. Geotechnical Report by Rapid Soil Solutions, LLC dated July 10, 2007. B. Oregon Department of Standard Specifications for Construction (OSSC), 2002. C. Oregon Administrative Rules (OAR) 340 -35 -0035 and 340-45 -0005. D. American Society for Testing and Materials (ASTM), current edition. E. ASTM D698, Test methods of Laboratory Compaction Characteristics of Soil Using Standard Effort. F. ASTM D2041, Standard test method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures. G. International Building Code (IBC) 2006. 3 DEFINTIONS A. Sub -grade - Ground surface after clearing and grubbing. B. Borrow Material - Borrow materials provided for general embankment construction shall be soil that is free of unsuitable materials or other characteristics detrimental to the construction of firm, dense and sound embankments. Borrow materials provided for other uses shall meet the specified requirements for the use intended. C. Selected Granular Backfill - Durable sand, gravel or combinations of these, selected as directed from specified excavations and containing no particle with Pacific Crossroads Corporate Center 2200 Rapid Soil Solutions, LLC 1 Earthwork • 2200 Earthwork any dimension greater than 75 mm (3 inches), or other unsuitable material. Reclaimed glass meeting the requirements of Section 02695 may be substituted for selected granular backfill. In addition, recycled concrete can also be used providing it meets the above gradation. Contractors electing to use recycled concrete should be advised that the moisture range for recycled concrete is very limited and so are quantities. For the use of recycled materials, concrete and glass aggregate, please refer to section 01400 Quality Control 4 QUALITY ASSURANCE A. The Owner shall engage a Geotechnical Engineer as the Owner's on -site representative for quality control and observation of earthwork. B. The Geotechnical Engineer will evaluate materials proposed for use as fill and backfill, perform and/or review appropriate tests, evaluate compaction and designate removal of un- suitable materials. The Contractor shall, in conjunction with the Geotechnical Engineer, mark areas of un- suitable materials. C. In place compaction tests or proof rolls will be made by the Geotechnical Engineer or their representative. Twenty four (24) hours notice is required to schedule such tests. D. Over - excavation' or covering of areas not yet inspected or tested by the Geotechnical Engineer will be at the sole expense of the Contractor. To schedule inspections please allow 24 hours notice. 4 SITE CONDITIONS • A. Subsurface Information: 1. The geotechnical engineering report for this project is located in the addendum section of the specifications. The information contained herein does not reflect the change in the soil conditions from the time of the report to construction, nor does it reflect the warranty of the sub - surface conditions. 2. Additional explorations may be performed at cost to the Contractor, with no additional cost to the Owner, and with written approval of the Owner. B. Existing Utilities: Provide adequate means of support and protection during earthwork operations if utilities are to remain in place. If uncharted utilities are located during construction activities, notify Owner immediately. 5. PROTECTION A. Protect survey benchmarks and monuments, fence, sidewalks, paving and curbs from equipment and vehicular traffic. B. Protect above and below grade utilities that are to remain. C. Notify Geotechnical Engineer and Architect when unexpected subsurface conditions occur and discontinue effected work in the area until notified to resume work. Pacific Crossroads Corporate Center 2200 Rapid Soil Solutions, LLC 2 Earthwork 2200 Earthwork PART 2 — PRODUCTS 1 MATERIALS A. Undocumented Fill Materials:. none where encountered in earlier explorations. B. Imported Granular Fill: 1. Shall meet the specification provided in OSC 00330.14 and OSSC 00330.15 2. Imported granular fill shall be well graded, pit or quarry run rock, crushed rock, gravel, or recycled glass or concrete meeting the following graduation requirements: The Contractor is requested to produce a 5 gallon sample of granular backfill material to the Geotechnical Engineer for testing with a least one week notice prior to placement so testing can be completed and the Contractor's field schedule met. Sieve Size 2" Percent square US No. Passing 4 75 -100 22 -100 US No. 200 0 -10 max 27 Sand Equivalent min C. Select Structural Fill to meet the gradation requirements stated above. D. Trench Backfill shall meet the following gradation requirements. The Contractor is requested to produce a 5 gallon sample of trench backfill material to the Geotechnical Engineer for testing with a least one week notice prior to placement so testing can be completed and the Contractor's field schedule met. Sieve Size Percent Passing 1 ' /z" square 100 1" square 75- 100' /z" square 50 -100 US No. 4 20 -80 US No. 40 3 -24 US No. 200 10 Sand Equivalent 27 min E. Foundation Stabilization: An un- weathered, hard, durable, free draining material, visibly well graded from coarse to fine with the maximum size between 400 mm (15 inches) and 75 mm (3 inches). Rock fragments larger than 400 mm (15 inches) but not larger than 900 mm (36 inches) may be included if placed as directed in 00330.42(c -2). If the 25.0 mm - 0 (1" - 0) portion exceeds 10% of the total volume by the Engineer's visual examination, the 25.0 mm - 0 (1 "- 0) material will be randomly sampled for testing. The wet sieve test (AASHTO T 11) will be performed on the sampled material. The amount of material passing the 75 mm (No. 200) sieve shall not exceed 5% by mass (weight). F. Drain Rock: Meet the following gradation requirements. The Contractor is requested to produce a 5 gallon sample of drain rock material to the Geotechnical Pacific Crossroads Corporate Center - 2200 Rapid Soil Solutions, LLC 3 Earthwork 2200 Earthwork Engineer for testing with a least one week notice prior to placement so testing can be completed and the Contractor's field schedule met. Sieve Size Percent Passing 1" square 100 3/4" square 80-100Y2" square 10 -40 US No. 4 0 -4 US No. 200 0 -2 G. On -Site Topsoil: Excess topsoil may be stockpiled in designated sites by the Owner and/or Architect. This stockpile has to be free of particles greater than 1 . inch. Please refer to Landscaping Specifications for details. H. Geo- textile Fabric: Shall be Mirafi X- Series. Shall be used in roadways. No other material is allowed unless with written consent of the Geotechnical Engineer. PART 3- EXECUTION 1 EXCAVATION A. Excavation: Excavation consists of removal and disposal of materials encountered. It is not a bid item. 1. Excavate to depth, lines and grades as shown on the Contract Drawings or as specified. 2. Remove organic soils as directed in Section 2100, Site Preparation and the Geotechnical Report. 3. Notify the Geotechnical Engineer if the site soil conditions differ from those in the report. 4. If unsuitable materials are encountered at the required sub -grade elevations, contact the Geotechnical Engineer to verify. Once on site, the Engineer will choose the best method to rectify the problem with Contractor's assistance. Verification by the Geotechnical Engineer will ensure Contractor payment for over excavation due to soft spots or unsuitable materials. 5. Proof rolls will be required to determine any soft spots in the subgrade and paving grades prior to rock placement, building slabs and asphalt paving. 6. If the Contractor elects to use materials that have not been approved by the Geotechnical Engineer he is doing so at his own risk. C. Stripping of extra topsoil from the site can be stockpiled for future landscaped areas provided that necessary erosion control best management practices (BMP's) are installed around stockpiles. 2 SUB -GRADE PREPARATION Pacific Crossroads Corporate Center 2200 Rapid Soil Solutions, LLC 4 Earthwork 2200 Earthwork A. Proof rolls are required on the prepared sub -grade with a fully loaded dump truck or water truck in the presence of the Geotechnical Engineer or their representative. B. Please allow 24 hours for scheduling proof rolls. C. Soft spots remediation will be directed by the Geotechnical Engineer. The use of foundation stabilization rock found in Section 2.1 E will be used in large areas that might need to be over - excavated. D. Protection of the sub - grade: 1. The on site SILTY soil is extremely moisture sensitive and cannot tolerate wheeled vehicle traffic. Do not allow equipment other than tracked vehicles over roadway sub - grades prior to placement of geotextile material and the full layer of aggregate base course. 2. Contractor staging areas are labeled on the drawings. 3. Repair to roadway or building sub - grades cause by Contractor, will be repaired by over- excavation and the placement of geo- textile fabric and foundation stabilization rock will be at no cost to the Owner. 4. Gravel construction entrance shall be constructed as per the Contract Drawings. 3 SURFACE WATER CONTROL A. Do not allow water to accumulate in excavation. Remove water to prevent softening of excavations, footings. B. Comply with all local regulations regarding the disposal of storm water from the job site. 4 BACKFILL A. General Backfill: 1. Use of on -site materials is acceptable providing that the moisture content is within the optimum percentage range. A standard proctor value was run on the native soil as part of the geotechnical report. See Appendix B of the report by Rapid Soil Solutions. 2. If this is not possible due to wet weather conditions, there are two alternatives: a. Alternative 1- Over- excavation to at least 12 inches of the areas exposed to traffic and replace with foundation stabilization materials. b. Alternative 2 - Cement treat the sub -grade in the areas that will be heavily trafficked. See pecification section 02741. B. Compaction: 1. Building footprints are required to be compacted to 95% of a standard proctor ASTM D698. 2. Roadway aggregate base course is to be compacted at 95% of a standard proctor ASTM D698. Pacific Crossroads Corporate Center 2200 Rapid Soil Solutions, LLC 5 Earthwork • 2200 Earthwork 3. Landscaped areas, sidewalks, unpaved and unimproved areas can be compacted to 90 %. 4. Retaining walls shall have at least 6in of aggregate base course below the footing. The rock sub -grade shall be compacted at 95% of ASTM D698. 5. Trench backfill in structural areas shall be compacted to 92% in the pipe zone and within 3 feet of finished sub -grade 95% of ASTM D698. Trench backfill in area's that are not structural are to be compacted to 90% of ASTM D698. 6. Notification of 24 hours is require to the Geotechnical Engineer for the scheduling of compaction tests. C. Placing Fill Materials: 1. Using equipment selected by the Contractor based on his experience he will uniformly spread the fill materials around structures or roadways. 2. Engineered fills will have lifts no greater than 8in's. 3. Compaction testing is required every 18in of material placed. D. Trench Excavation and backfill: 1. Excavation of trench should be net lines to the lines and grades shown on the drawings. The width of the trench's shall not be less than the diameter of the pipe plus 18in. • 2. Pipe bedding shall be placed at least 6in over the top of the pipe. 3. Compaction standards at stated in section.3.4 B. 5 GRADING A. Grade the site to the tolerances noted on the drawings. B. Grade sidewalks 'arid pavements to allow the storm water to flow away from the structures and into approved storm water disposal areas. 6 COMPLETION A. Remove all waste materials, including unacceptable excavated materials to approved disposal sites as directed by the Owner. B. During the duration of the project comply with local regulations regard street sweeping. END OF SECTION • Pacific Crossroads Corporate Center 2200 Rapid Soil Solutions, LLC 6 Earthwork • 2240 Cement Treated Sub -grade 2240 — Cement Treated Sub -grade Section not prepared by Mildren Design Group, PC. It is solely the product of Rapid Soil Solutions. PART 1- GENERAL 1 DESCRIPTION OF WORK A. Furnish all labor, materials, equipment and incidentals required to perform treatment of on -site soils. B. This work will consist of treating the upper layer of sub -grade with water and either lime, chloride, or Portland cement to form a stabilized course of material at the locations and to the lines, grades, thicknesses, and cross section shown or directed. C. Cement treatment is an elected option to utilize the sub -grade during the wet weather. The targeted 7 -day unconfined compressive strength is 250 psi. The percentage of cement will be determined by laboratory testing. D. Related Sections: Section 2100: Site Preparation Section 2240: Cement Treated Sub -grade Section 2741: Asphalt Concrete Pavement 2 REFERENCE STANDARDS AND DOCUMENTS A. Geotechnical Report by Rapid Soil Solutions, LLC dated July 10, 2007. B. Oregon Department of Standard Specifications for Construction (OSSC), 2002. C. Oregon Administrative Rules (OAR) 340 -35 -0035 and 340 -45 -0005. D. American Society for Testing and Materials (ASTM), current edition. E. ASTM D698, Test methods of Laboratory Compaction Characteristics of Soil Using Standard Effort. F. Portland Cement Association (PCA) SR221 S 3 QUALITY ASSURANCE AND SUBMITTALS A. The soil cement Contractor shall have experience of at least 5 projects in the same size and scope. B. All cement treating will be observed and tested by the Geotechnical Engineer or their representative. C. The Contractor will supply to the. Geotechnical Engineer a 4- 5gallon sample of soil and cement to be used for laboratory testing and determination of the optimum cement ratio given the current soil conditions. Please allow for at least 10 working days for laboratory testing and review before field work is to start. D. The Contractor is advised to give 48 hours notice for the start of cement Pacific Crossroads Corporate Center 2240 Rapid Soil Solutions, LLC 1 Cement Treated Sub -grade 2240 Cement Treated Sub -grade treating operations. E. To assist the Contractor during the treatment operations, the Geotechnical Engineer will provide moistures in accordance with ASTM D2922. 4 PROTECTION A. Curing - Limit traffic over treated sub -grade to equipment with tracks. Only these vehicles will not cause any damage to the sub -grade and do not visibly deflect, ravel or wear the surface. Keep the finished surface moist and protect from rutting, spalling, displacement and disfiguration for a period of seven days, or until a subsequent course of material is placed which will prevent drying of the mixture by evaporation or absorption PART 2 — PRODUCTS 1 MATERIALS A. Soil should be free of organics, clay balls, roots and particles greater than 3 inches. B. Cement shall be Portland cement, shall comply with the latest ASTM C 150, CSA Standard.A -5M or AASHTO M85) or blended hydraulic cements (ASTM C595 or AASHTO M240) excluding slag cements (types S and SA) for this application. 2 EQUIPMENT A. Spreading Equipment shall be capable of uniform distribution of the cement. B. Mixing Equipment shall be either central plant mixed or for mixed in -place method. No cement treated mixture shall be spread when the soil or sub -grade is frozen or when the air temperature is below 40degrees F in the shade. The total elapsed time between the addition of water to the mixture and completion of finishing shall not exceed 4 hours. The mixing time shall be that which is required to secure uniform mixture. C. Compaction Equipment shall be chosen by the Contractor using his experience with the soils in the area. The equipment shall have sufficient capacity to compact the soil cement ratio to the 95% ASTM D698. PART 3- EXECUTION 1 MONITORING A. The Geotechnical Engineer will verify that the site is ready for soil cement treatment. 2 SUB -GRADE PREPARATION Pacific Crossroads Corporate Center 2240 Rapid Soil Solutions, LLC 2 Cement Treated Sub -grade • 2240 Cement Treated Sub -grade A. Proof rolls are required on the prepared sub -grade with a fully loaded dump truck or water truck in the presence of the Geotechnical Engineer or their representative. B. Please allow 24 hours for scheduling proof rolls. C. Soft spots remediation will be directed by the Geotechnical Engineer. The use of foundation stabilization rock found in Section 2.1 E will be used in large areas that might need to be over - excavated. 3 SUB -GRADE STABILZATION A. See Section 1.3 Quality Assurance regarding details of notification of start of soil cement work. B. Based on SILTY soil found on the site and the forecasted traffic loading conditions, the depth of the cement treatment required is 12 inches or 1 foot. C. Finish the surface of the treated sub -grade so that it does not vary by more than 15 mm (1/2 inch) from the established grade and cross section at any point. When tested with a 3.6 m (12 foot) straightedge, the maximum variation of the finished surface from the testing edge is 15 mm (1/2 inch). D. After curing has taken place the Contractor is required to do a proof roll to determine if any soft spots exist. If found, soft spots will be evaluated by the Engineer. After review of the field notes taken during the cement treatment operation, the Engineer will determine if the guidelines establish by the laboratory testing were followed. If they were not the remediation of such areas will be required at the Contractor's expense. 4 FIELD QUALITY CONTROL • A. The Geotechnical Engineer will have someone present during the entire cement treatment operation. They will work with the Contractor to ensure a quality product. The following field tests will be performed: moistures, compactions, % of cement used and field compressive strengths of the soil /cement mixtures taken both in the morning and afternoon. • Pacific Crossroads Corporate Center 2240 Rapid Soil Solutions, LLC 3 Cement Treated Sub -grade 2240 Cement Treated Sub -grade END OF SECTION Pacific Crossroads Corporate Center 2240 Rapid Soil Solutions, LLC 4 Cement Treated Sub -grade 2741 Asphalt Concrete Pavement 2741 — Asphalt Concrete Pavement Section not prepared by Mildren Design Group, PC. It is solely the product of Rapid Soil Solutions. PART 1- GENERAL 1 DESCRIPTION OF WORK A. Furnish all labor, materials, equipment and incidentals required to perform asphalt concrete paving on the site as directed by the drawings and specified herein. B. The required thickness for asphalt paving is 4 inches with a total of 8 inches of rock below (6 inches of 1 '/2" minus and 2 inches of 1/4" minus with fabric below). • C. Related Sections: Section 2100: Site Preparation Section 2200: Earthwork Section 2240: Cement Treated Sub -grade 2 REFERENCE STANDARDS AND DOCUMENTS A. Geotechnical Report by Rapid Soil Solutions, LLC dated July 10, 2007. B. Oregon Department of Standard Specifications for Construction (OSSC), 2002. C. Oregon Administrative Rules (OAR) 340 -35 -0035 and 340-45 -0005. D. American Society for Testing and Materials (ASTM), current edition. E. ASTM D698, Test methods of Laboratory Compaction Characteristics of Soil Using Standard Effort. F. Portland Cement Association (PGA) SR221 S 3 QUALITY, ASSURANCE A. The Paver shall have at least 5 years experience with projects of similar size. B. The Geotechnical Engineer or their representative will be on -site continuously during the paving operations. Please schedule at least 24 hours ahead. C. Paving will not take place with ground temperatures below 50 degrees. PART 2 — PRODUCTS 1 MATERIALS A. Base Aggregates shall be between 3 /" and 1 %" and meet OSSC for crushed rock or gravel with 5% passing No. 200 sieve. B. Asphalt Concrete Materials shall be Level 2 - 1/2" mix design according to Pacific Crossroads Corporate Center 2741 Rapid Soil Solutions, LLC 1 Asphalt Concrete Pavement • 2741 Asphalt Concrete Pavement OSSC 00745.10 C. The use of Reclaimed Asphalt Pavement (RAP) is governed by ODOT TM 323 and AASHTO T308 shall not be greater than 30% in the new mix design. • 2 EQUIPMENT A. The Contractor shall provide equipment capable of meeting the compaction criteria of 91% of ASTM T209 for the first lift and 92% for the second lift. PART 3- EXECUTION 1 SUB -GRADE PREPARATION A. Proof rolls are required on the prepared sub -grade with a fully loaded dump truck or water truck in the presence of the Geotechnical Engineer or their representative. Compaction testing is required on final lift of aggregate base course of 95% of ASTM D698. B. Please allow 24 hours for scheduling proof rolls. C. Soft spots remediation will be directed by the Geotechnical Engineer. The use of foundation stabilization rock found in section 2.1 E will be used in large areas that might need to be over - excavated. 2 INSTALLATION A. Place asphalt concrete in accordance with OSSC 0745. B. The maximum lift height is 3 inches. C. Place asphalt between the temperatures of 240 -325 degrees F. D. Do not compact newly placed asphalt when the temperature is below 175 degrees F. • E. Compaction is required to be 91% for the first lift and 92% for the second lift as per ASTM T209. Testing to be performed randomly on the work area. F. Comply with the paving tolerances specified on the Contract Drawings. 3 FIELD QUALITY CONTROL A. The Geotechnical Engineer or their representative will be on -site during the entire paving operation sampling and performing compaction tests. Pacific Crossroads Corporate Center 2741 Rapid Soil Solutions, LLC 2 Asphalt Concrete Pavement • . . 2741 Asphalt Concrete Pavement END OF SECTION • Pacific Crossroads Corporate Center 2741 Rapid Soil Solutions, LLC 3 Asphalt Concrete Pavement