Firm Description: Professional Service Industries, Inc. (PSI)

Intertek Company Integration: PSI operates as a pivotal subsidiary of Intertek, a globally recognized leader in total quality assurance. This integration allows PSI to leverage vast international resources while maintaining a localized footprint in Minnesota to serve the City of Maple Grove. Their multidisciplinary approach ensures that construction projects benefit from both geotechnical depth and global testing standards.
Legacy of Technical Excellence: With decades of experience in the North American construction market, PSI has established itself as the premier choice for municipal infrastructure and public safety facilities. Their expertise in the "TIC" (Testing, Inspection, and Certification) industry is foundational to their role in the North Metro Range project, where they provide independent, third-party verification of structural integrity and material compliance.
Localized Geotechnical Mastery: PSI’s Twin Cities regional office provides direct, responsive support to Maple Grove. Their team of licensed professional engineers and certified technicians possesses a granular understanding of local soil profiles, specifically the undocumented fill and glacial deposits characteristic of the North Metro Range site. This local insight is critical for managing the 3,500 psf bearing capacity requirements specified in the project’s structural design.
Comprehensive Service Spectrum: PSI’s capabilities extend far beyond simple testing. They offer a holistic suite of services including geotechnical engineering, environmental consulting, and industrial hygiene. For the North Metro Range building additions, they serve as the "Eyes and Ears" of the City, ensuring that every yard of concrete and every structural weld meets the high standards required for a regional public safety training facility.
Commitment to Site Safety and Responsibility: While the firm explicitly clarifies that job site safety remains the responsibility of the primary contractor, PSI integrates a "safety-first" culture into their observation protocols. Their representatives are trained to identify technical defects that could lead to structural failure, thereby protecting the public investment in the 11370 89th Avenue North facility.
Data-Driven Reporting Infrastructure: PSI utilizes a sophisticated digital reporting system that provides the Client with near-instantaneous access to field data. This transparency is vital for the Maple Grove City Council and project managers to maintain the construction schedule. Whether it is a failed slump test or a subgrade verification, PSI’s rapid data dissemination prevents costly downstream delays.
Specialized Marine and Heavy Civil Capacity: Although this project focuses on a terrestrial public safety range, PSI maintains the operational capacity for complex heavy civil projects. Their ability to transition between specialized soil correction techniques, such as Rammed Aggregate Piers, and standard shallow foundation observation demonstrates a versatility that is rare in the regional testing market.
Ethical and Professional Integrity: PSI adheres to strict internal quality control standards that exceed industry benchmarks. Their role as an independent observer ensures that there is no conflict of interest between the construction crews and the technical verification process. This integrity provides the City of Maple Grove with the assurance that the facility is built to last for generations of first-responder training.
Innovation in Subsurface Investigation: PSI’s use of advanced geotechnical modeling allows them to interpret core borings and subsurface explorations with extreme precision. For the North Metro Range additions, they successfully navigated the complexities of variable fill elevations ranging from 902 to 911 feet, providing a stable foundation for the 24,000 sq ft footprint.
The Intertek Advantage: By combining PSI's engineering rigor with Intertek's global laboratory network, the firm provides a level of technical depth that ensures compliance with the most stringent national building codes. Their participation in the North Metro Range project signifies a commitment to engineering excellence that aligns perfectly with the City of Maple Grove's strategic vision for public safety infrastructure.

Scope of Services: Construction Observation and Testing

Phase 1: Project Setup and Documentation Review: The engagement begins with a formal $200 project setup phase, involving a comprehensive review of structural drawings dated 9/7/2021. PSI’s technical leads synchronize with the City’s project team to establish a communication matrix for the 24,000 sq ft addition. This ensures that every testing requirement is mapped to the construction milestones.
Phase 2: Subgrade Evaluation and Soil Correction: Given the presence of undocumented fill at the North Metro Range, PSI’s primary task involves verifying the removal or correction of unstable soils. This scope includes the observation of subgrade preparation for building additions, ensuring that the ground can support the planned single-story slab-on-grade structures.
Phase 3: Observation of Rammed Aggregate Piers (RAPs): A critical component of the scope is the observation of Rammed Aggregate Pier installation. These piers are utilized in lieu of extensive soil correction to support foundations. PSI technicians monitor the installation process to verify that the piers reach the required elevations and provide the necessary load-bearing capacity for the 3,500 psf design load.
Phase 4: Foundation and Footing Verification: PSI provides continuous observation during the placement of conventional shallow foundations. This includes verifying the net allowable bearing capacity and ensuring that the cast-in-place concrete foundation walls are positioned according to the structural design, with a finished floor elevation of 918.20 feet.
Phase 5: Cast-In-Place Concrete Testing: The scope includes rigorous field testing of all cast-in-place concrete. This encompasses slump tests, air content verification, and temperature monitoring. PSI technicians cast test cylinders for laboratory compression testing to verify that the concrete strength meets the structural requirements for the foundation walls and slabs.
Phase 6: Precast Concrete Wall Panel Inspection: PSI observes the installation and connection of precast concrete wall panels. This ensures that these heavy structural elements are properly secured and that the structural integrity of the 24,000 sq ft footprint is maintained. Technicians verify that connections and welds are performed in accordance with the project specifications.
Phase 7: Structural Steel Framing Observation: The scope extends to the structural steel framing that supports the facility's roof and interior spans. PSI provides observation of steel erection, including the verification of bolt torque and weld quality. This ensures that the building shell is robust and compliant with the 9/7/2021 design concepts.
Phase 8: Asphalt Pavement and Sitework Testing: Beyond the building footprint, PSI manages the testing of site utilities and asphalt pavements. This includes density testing of subbase materials and asphalt layers using nuclear gauges or core sampling to ensure long-term durability of the North Metro Range access roads and parking areas.
Phase 9: Concrete Pavement Observation: Similar to asphalt, all concrete pavements for the site are observed and tested. PSI ensures that exterior flatwork meets the required thickness and strength specifications, preventing premature cracking or failure under heavy utility vehicle loads.
Phase 10: Technical Time Allocation and Portal-to-Portal Billing: Services are provided on a unit-price basis, with a minimum 4-hour charge for field visits. PSI employs a portal-to-portal billing structure, ensuring that the City is only charged for the actual technical time expended. Overtime rates (1.5x) are applied for services outside the 7:00 AM to 5:00 PM window.
Phase 11: Real-Time Field Representation: PSI maintains a "continuous" field presence during all major construction activities. The term "continuous" is defined as the technician being on-site and in the general work area during the activity requiring observation, providing the City with a constant technical safeguard against construction defects.
Phase 12: Laboratory Testing and Verification: All samples collected in the field are transported to PSI’s facility for laboratory analysis. This includes soil moisture-density relationships (Proctors) and concrete cylinder breaks. Laboratory results are integrated into the final reports to provide empirical evidence of material compliance.
Phase 13: Final Reporting and Documentation Issuance: Upon completion of the testing phases, PSI synthesizes all data into final reports. The issuance of these reports is contingent upon the verification that all construction substantially complies with the plans, specifications, and design concepts provided by the City of Maple Grove.
Phase 14: Quality Assurance for Site Utilities: The scope includes the observation of backfill for site utilities. PSI ensures that trenches are properly compacted to prevent future settlement of pavements or structural foundations, a critical step for the 11370 89th Avenue North facility.
Phase 15: Structural Drawing Alignment: Throughout the project, PSI continuously references the Structural Drawings to ensure that field conditions match the engineered designs. Any deviations are immediately flagged to the City, allowing for corrective actions before they impact the critical path of the project.
Phase 16: Professional Engineering Oversight: All field observation and testing are performed under the technical direction of a Licensed Professional Engineer. This ensures that every technical judgment made on-site is backed by the engineering expertise required for a high-occupancy public safety training range.

Technical Evaluation & Criteria

Contract Fee Structure

Project Set-up: $200.00 Flat Fee.
Transportation: $45.00 per Trip Charge.
Minimum Billing: 4-Hour Charge for Field Services.
Overtime Rate: 1.5x Standard Unit Price.
Unit Prices: Billed portal-to-portal from facility.

Engineering Evaluation Metrics

The technical evaluation for the North Metro Range project is based on "Substantial Compliance." PSI defines their criteria as the observation of work to determine adherence to the structural plans dated 9/7/2021. Evaluation benchmarks include the 3,500 psf net allowable bearing capacity and the 918.20 ft finished floor elevation.

Technical Callouts

RAP

Rammed Aggregate Pier. A soil reinforcement element created by compacting layers of aggregate to increase bearing capacity without full soil correction.

Continuous Observation

The physical presence of a technician in the general work area during the specific construction activity being tested or verified.

Portal-to-Portal

A billing methodology where technical time is tracked from the moment the representative leaves the PSI facility until their return.

3,500 PSF

Pounds per Square Foot. The net allowable bearing capacity required for the foundations to safely support the 24,000 sq ft structure.

GAYA CAPITAL

DOCUMENT REF: PSI-MG-704

North Metro Range Building Additions