J017-II Utilities & Site Improvements-Phase II Main & Commercial Gates
Client: Pacific Rim Constructors, Inc.
IAN Corporation entered into a subcontract agreement with Pacific Rim Constructors, Inc., for the following Civil-related works:
- Erosion and Sediment Control (Main and Commercial)
- Site Grading and Basecourse (Main and Commercial)
- Site Drainage System (Main and Commercial)
Erosion and Sedimentation Control for Main and Commercial Gates:
IAN Corporation supplied and installed erosion and sedimentation control as indicated in the Prime Contractors drawings, to include, silt fence, check dam or sandbag berm, runoff flow direction, temporary inlet protection, stabilized construction entrance with concrete washout and fiber roll.
In the event of severe weather, IAN Corporation maintained all temporary erosion control measures implemented at the project site.
Site Grading for Main and Commercial Gate:
IAN Corporation successfully completed the site grading and preparation work in full accordance with the contract drawings and specifications. Their survey crew accurately laid out all site grading elevations and grades. Excavation and grading were performed to the specified contours, elevations, and dimensions, extending five feet beyond all pavement and structural boundaries. Subgrade preparation was executed with precision, including scarifying and proof rolling to achieve 95% density per ASTM D1557 standards, with timely notification provided to the contractor for inspection.
IAN Corporation filled and backfilled designated areas to the required dimensions, maintaining 95% ASTM D1557 density within five feet of structures. Fill materials were placed and compacted in six-inch lifts, meeting all density requirements, and all necessary materials were supplied by the company. Vegetation areas were compacted to 90% ASTM D1557 density. Compaction tests were performed at random locations every 2,500 square feet, with results consistently documented in daily reports.
Finish grading was completed with high accuracy, ensuring grades were within one-tenth of a foot and that water drained effectively away from structures. Specific elevation targets were met, including the bottom elevation of topsoil in landscape areas, top elevation of base course for roads, parking lots, sidewalks, and bicycle paths, and bottom elevation of base course for slab-on-grade building structures.
IAN Corporation also restored all disturbed areas, implemented erosion protection measures, and repaired any damage incurred during the grading process. Surplus materials and debris were removed from the site. Gravel surface roads were constructed at specified locations with properly compacted base courses. The company provided comprehensive traffic control—including signage, devices, and personnel—for road widening operations. All additional items shown in the contract drawings and specifications related to site grading were supplied and installed as required.
All compaction and material testing fees were covered by IAN Corporation, and any additional work indicated in the contract drawings was completed as part of the overall scope.
Site Drainage for Commercial Gate:
IAN Corporation has successfully completed all contracted work associated with the construction and installation of the site drainage system, in full accordance with the approved contract drawings and specifications. The scope of work included the construction of a concrete check dam, which involved excavation, subgrade preparation, placement of base course and formwork, concrete pouring, installation of filter fabric and bio-retention soil media, followed by backfilling and compaction. The storm water basin was constructed through excavation, installation of filter fabric and bio-retention soil media, and stabilization of the earth-wall surfaces. A grassy trap swale was also constructed, requiring excavation, subgrade preparation, base course placement, installation of filter fabric and bio-retention soil media, and final backfilling and compaction.
Additionally, IAN Corporation completed the construction of a pond overflow spillway, which included excavation, subgrade preparation and compaction, installation of filter fabric and grouted riprap, and backfilling. The company installed a 4-inch PVC underground drainage line for two active barriers, involving excavation, subgrade preparation, placement of pipe bedding materials, and backfilling and compaction. The drainage line was properly connected to the adjacent existing water retention basin, with the end pipe fitted with either a flared end or a cast-in-place concrete headwall. The retention basin was restored to its original condition upon completion.
For all fill material and base course placement, materials were spread and compacted in lifts not exceeding 6 inches of loose fill per lift, achieving a minimum of 95 percent of the ASTM D1557 maximum dry density, as verified by third-party compaction testing. Furthermore, any additional scope of work related to the site drainage system that may not have been explicitly listed but was shown on the contract drawings has been completed as part of this contract.
