Inspection Program Research Articles

Aircraft Safety in Focus: Evaluating Foreign Object Debris/damage Detection Practices among Aircraft Mechanics at Clark International Airport

The acronym FOD is now used to describe both the foreign objects themselves, and any foreign object damage attributed to them. A FOD-prevention program of training, facility inspection, maintenance, and coordination between all affected parties can minimize FOD and its effects.

Pseudomonas Infection Outbreak Associated with a Hotel Swimming Pool - Maine, March 2023.

Treated recreational water venues (e.g., pools and hot tubs) located at hotels represent one third of sources of reported treated recreational water-associated outbreaks; when these outbreaks are caused by Pseudomonas aeruginosa, they predominantly occur during January-April. On March 8, 2023, the Maine Center for Disease Control and Prevention (Maine CDC) initiated an investigation in response to reports of illness among persons who had used a swimming pool at hotel A during March 4-5. A questionnaire was distributed to guests who were at hotel A during March 1-7. Among 35 guests who responded, 23 (66%) developed ear pain, rash, or pain or swelling in feet or hands within days of using the pool during March 4-5. P. aeruginosa, a chlorine-susceptible bacterium, was identified in cultures obtained from skin lesions of three patients; a difference of two single nucleotide polymorphisms was found between isolates from two patients' specimens, suggesting a common exposure. Hotel A management voluntarily closed the pool, and Maine CDC's Health Inspection Program identified multiple violations, including having no disinfectant feeder system, all of which had been identified during a previous inspection. Because chlorine had been added to the pool water after the pool was voluntary closed, environmental samples were not collected. The pool remained closed until violations were addressed. Health departments can play an important role in reducing the risk for outbreaks associated with hotel pools and hot tubs. This reduction in risk can be achieved by collaborating with operators to ensure compliance with public health codes, including maintaining chlorine concentration and otherwise vigilantly managing the pool, and by disseminating prevention messages to pool and hot tub users.

Maize meal (posho) served at selected boarding schools in western Uganda is highly contaminated with aflatoxins

Abstract The study aimed to evaluate food handling practices and assess the maize-bean supply chain in selected boarding schools of western Uganda. Additionally, it sought to determine the extent of aflatoxin exposure in the maize-bean meal consumed by students within the age range of 5 to 24. A cross-sectional study was conducted in two districts of Bushenyi and Sheema to gather 95 samples (31 beans, 32 maize flour, and 32 cooked maize flour-posho). In addition, 262 individual interviews were conducted. The findings revealed that only 9.38% of the schools store food as per World Health Organisation standards. The majority of schools (57.9%) purchase maize flour and beans from any stockist with no contractual obligations (random supplier), and all the 32 schools base on visual parameters, especially white colour, and smell to rule out aflatoxin contamination. Maize flour stored on the ground registered significantly (P = 0.0018) higher levels (54.3 ± 10.1 μg/kg) of total aflatoxins than that stored on a raised platform (14.7 ± 2.6 μg/kg). Likewise, the supplier significantly influenced total aflatoxins levels (P = 0.0064), with higher levels (44.6 ± 8.0 μg/kg) detected in maize flour supplied by a random supplier than a pre-qualified one (14.7 ± 2.6 μg/kg). Given the low levels (1.3 to 2.8 μg/kg), which are far less than the Maximum Tolerated Limit (MTL) of 10 μg/kg, aflatoxins do not pose a significant problem in beans. Aflatoxins exposure in younger children (5-12 years) was higher (61.5 ng/kg bw/day) than in older ones (13-24 years; 41.5 ng/kg bw/day). Similarly, the risk of developing hepatocellular carcinoma was greater in younger children (1.84 cases per 100,000 people) compared to older ones (1.24 cases per 100,000 people). The findings underscore an urgent need to formulate guidelines for procurement, storage, and food handling in schools, alongside intensifying inspection programmes for food handling. Additionally, there is need to expand the research scope by incorporating a greater number of schools from varied geographical areas within Uganda, while rigorously monitoring the entirety of the food supply chain.

Operating Experience of Snubbers in Indian Pressurized Heavy Water Reactors

In a Nuclear Power Plant (NPP), the piping layout needs to have flexibility to reduce the operating stresses and nozzle loads due to thermal expansion. At the same time, the piping and equipment need to be supported adequately to sustain the dynamic loads viz., seismic loads, sudden opening/closing of valves etc. In Indian Pressurized Heavy Water Reactors (PHWRs), Snubbers are provided on nuclear equipment & piping to serve both purposes i.e. allow flexibility for thermal movement during operation and at the same provide requisite rigidity to take care of dynamic loads. Snubbers are subjected to harsh environment during operation including high temperature, radiation, vibration and corrosive condition, which may adversely affect its performance. Various degradations viz., high drag force, shift in dynamic characteristics (locking characteristic), jamming etc. have been observed. Periodic testing of Snubbers is required to ensure the proper functioning during normal operating condition as well as during dynamic event. A dedicated In-Service Inspection (ISI) program for snubbers exists in Indian PHWRs to ensure healthiness/functionality of Snubbers. Efforts have been made to reduce numbers of Snubbers progressively in PHWR units. Numbers of snubbers have been significantly reduced in latest 700MWe PHWR Design. This paper covers the various degradations observed in snubbers, ISI program for snubbers, design modifications, Snubber testing, assessment for fitness for service, replacement of Snubbers in older units and optimization of snubbers.

Detection and monitoring of the fatigue crack growth on welds – Application-oriented use of NDT methods

Early detection of fatigue cracks and accurate measurements of the crack growth play an important role in the maintenance and repair strategies of steel structures exposed to cyclic loads during their service life. Observation of welded connections is especially of high relevance due to their higher susceptibility to fatigue damage. The aim of this contribution was to monitor fatigue crack growth in thick welded specimens during fatigue tests as holistically as possible, by implementing multiple NDT methods simultaneously in order to record the crack initiation and propagation until the final fracture. In addition to well-known methods such as strain gauges, thermography, and ultrasound, the crack luminescence method developed at the Bundesanstalt für Materialforschung und -prüfung (BAM), which makes cracks on the surface particularly visible, was also used. For data acquisition, a first data fusion concept was developed and applied in order to synchronize the data of the different methods and to evaluate them to a large extent automatically. The resulting database can ultimately also be used to access, view, and analyze the experimental data for various NDT methods. During the conducted fatigue tests, the simultaneous measurements of the same cracking process enabled a comprehensive comparison of the methods, highlighting their individual strengths and limitations. More importantly, they showed how a synergetic combination of different NDT methods can be beneficial for implementation in large-scale fatigue testing but also in monitoring and inspection programs of in-service structures - such as the support structures of offshore wind turbines.

On the interaction between a large landslide and a bridge

The roads and motorways bridge inspection program which is undergoing in Italy is revealing the high number of infrastructures interacting with landslide phenomena. It cannot be otherwise in a country characterized by such a complex morphology. A peculiar example of such soil-structure interaction is that represented by the Rio Bavera bridge in Triora whose abutment is affected by a large landslide. The paper describes this interaction from the phenomenological point of view. The geological and geotechnical investigation carried out to characterize the behavior of the soil and rock formations constituting the large landslide will be illustrated together with the monitoring activities undertaken to understand the mutual interaction between the landslide and the bridge.

Routine monitoring of hydraulic infrastructures using the European Ground Motion Service and other satellite radar sensors

Ensuring the safety and operational efficiency of hydraulic infrastructures is paramount, considering the widespread consequences that damages can inflict on people, communities, and the environment. To mitigate risks and prevent significant losses, continuous surveillance is vital. While some damages might appear minor, they can jeopardize the complete operational reliability of dams, leading to substantial economic losses, especially in energy production and related activities. The rapid growth in 20th-century infrastructure development globally has made security monitoring a necessity for numerous civil structures. Rigorous inspection programs, particularly for reservoir dams, are essential for safeguarding citizens and their properties. However, individually monitoring each dam is often impractical due to the associated costs and time constraints, potentially posing safety risks. Fortunately, satellite-based differential radar interferometry (DInSAR) offers an effective and cost-efficient remote sensing solution. Multi-temporal Interferometric Synthetic Aperture Radar (MT-InSAR) techniques, particularly utilizing Persistent Scatterers, have proven successful in monitoring various infrastructures, natural phenomena, and geological activities. MT-InSAR provides precise measurements without the need for fieldwork, utilizing historical SAR image archives dating back to the 1990s. Technological advancements, such as the Sentinel-1 C-band with a six-day revisit time until the end of 2021, have enhanced monitoring capabilities. Additionally, commercial radar images in the X-band and the development of multi-interferometric InSAR techniques have opened new avenues for monitoring. This study showcases the adaptation and application of MT-InSAR for monitoring dams and large ponds constructed with loose materials. By assessing vertical displacements and consolidation rates, the technique identifies potential issues, aiding in further field investigations. Case studies involving dams and large reservoirs in Andalusia illustrate the effectiveness of satellite radar interferometry in monitoring their structural stability from space as a routine practice.

Dynamic measurements to assess stress levels on buried hydraulic structures

ABSTRACT Old masonry structures have a very special nature that require periodical inspection and evaluation programs. The problem becomes more sophisticated when dealing with vital buried hydraulic structures under continuous functional operation while bearing additional loads from running public services such as railways. This could add extra challenges for determining their structural performance and engineering characteristics if conventional methods are used. Moreover, traditional methods are sometimes costly, time consuming, and can lead to some damage to the structure. The importance of the current research is therefore providing a rapid methodology for evaluating these structures to confirm their current ability to resist operating loads safely, especially when subjected to aging. In this study, the evaluation depends mainly on analyzing the vibration acceleration response of a structure under dynamic loads. Insight into system identification using formal modal analysis was also conducted. Simultaneously, calibrated numerical model was then adopted to predict the expected level of internal stresses. An old masonry irrigation intake buried culvert underneath the main railway lines was selected for examination. The structure was firstly plugged from both sides and emptied, site inspection as well as core sampling of construction materials were conducted. Vibration time history was recorded due to train passage with different speeds. The filed measurements along with mathematical model were used to estimate the level of stresses among the structure. The results showed the ability of the proposed method to evaluate structures in an easy and rapid fashion compared to traditional methods without stopping serviceability of the structure.

An assessment of worker exposure to respirable dust and crystalline silica in workshops fabricating engineered stone.

There is a significant silicosis risk for workers fabricating engineered stone (ES) products containing crystalline silica. The aims of this study by SafeWork NSW were to: (i) assess current worker exposure to respirable dust (RD) and respirable crystalline silica (RCS) following a 5-y awareness and compliance program of inspections in ES workshops and (ii) to identify improvements in work practices from the available evidence base to further reduce exposures. One hundred and twenty-three personal full shift samples taken on as many workers and 34 static samples across 27 workshops fabricating ES were included in the final assessment. The exposure assessment was conducted using Casella Higgins-Dewell cyclones (Casella TSI) placed in the breathing zone of workers attached to SKC Air Check XR 5000 or SKC Chek TOUCH sampling pumps. Sample filters were sent to an ISO (2017) 17025:2017 accredited laboratory for gravimetric analysis for RD and X-Ray Diffraction (XRD) analysis to determine the amount of deposited RCS i.e. alpha-quartz and cristobalite. All workshops used wet methods of fabrication. The geometric mean (GM) of the pooled result for respirable dust (RD) was 0.09 mg/m3 TWA-8 h and 0.034 mg/m3 TWA-8 h for RCS. The highest exposed workers with a GM RCS of 0.062 mg/m3 TWA-8 h were those using pneumatic hand tools for cutting or grinding combined with polishing tasks. Workers operating semiautomated routers and edge polishers had the lowest GM RCS exposures of 0.022 mg/m3 TWA-8 h and 0.018 mg/m3 TWA-8 h respectively. Although ES workers remain exposed to RCS above the workplace exposure limit (WEL) of 0.05 mg/m 3 TWA-8 h, these results point to a very substantial reduction in exposures compared to poorly controlled dry methods of fabrication. Therefore, the wearing of respiratory protection by workers remains necessary until further control measures are more widely adopted across the entire industry e.g. reduction in the crystalline silica content of ES.

Interpreting and evaluating open norms of person-centred care in daily regulatory practice of the Dutch nursing home care setting

Objective:The emphasis on person-centred nursing home care poses a key challenge for inspectors who regulate quality of care, because of its situated characteristics (i.e., for each client different and changing over time). This makes it difficult to assess with predetermined norms in contrast to for example requirements of medication safety. In this paper, we therefore empirically investigate how inspectors operationalize and evaluate open norms of person-centred care in the Dutch healthcare setting.Methods:Qualitative methods were used to study the work of inspectors who assess the quality of nursing home care within the Dutch Health and Youth Care Inspectorate. The first author7it observed the inspection process of nursing home care organizations (preparation, inspection visit, consults between inspectors and team meetings) and conducted semi-structured interviews with the observed inspectors and managers of the assessed organizations. Furthermore, different versions of the quality report were analyzed.Results:Easy made operationalizations of person-centred care (e.g., choice for meal) received more attention than other, less easily made, operationalizations of person-centered care (e.g., group dynamics). The following three exclusion mechanisms show why certain aspects of person-centred care got less attention than others: 1) not being able to triangulate information 2) doubting the trustworthiness of a person 3) not being able to deviate from the structure of the inspection program. Furthermore, there are two exclusion mechanisms that show how the assessment of person-centred care is ignored or overruled by other values in the assessment framework: 1) downplaying person-centredness by mitigating circumstances and, 2) prioritization of safety risks over risks of lacking person-centredness.Conclusion:In evaluating person-centred nursing home care using open norms, certain mechanisms are in place that exclude the assessment of quality of (certain aspects of) person-centered care. To overcome these mechanisms, a different, more reflexive approach for regulation might be needed to encourage stakeholders to engage in self-observation and self-criticism. Reflexive regulation using narrative methods can be especially helpful with complex issues, which are associated with uncertainty about standards and where different perspectives play a role. In further participative action research, we will experiment with and study the use of reflexive regulation using narrative methods in long-term care.

Foodborne Illness Complaint Systems Detect, and Restaurant Inspection Programs Prevent Restaurant-Associated Foodborne Illness Outbreaks.

Restaurants are important settings for foodborne illness transmission. Environmental health agencies routinely inspect restaurants to assess compliance with food safety regulations. They also evaluate foodborne illness complaints from consumers to detect potential outbreaks of foodborne illness. Local environmental health agencies were surveyed to identify methods used to conduct surveillance for consumer complaints of foodborne illness, link them to inspection grading and disclosure practices, and evaluate the association between these practices and the number of foodborne illness outbreaks in restaurant settings reported to the Centers for Disease Control and Prevention. We developed a novel framework for assessing the effectiveness of restaurant inspection grading and disclosure of inspection results while accounting for any biases introduced by surveillance factors that affect outbreak detection. Our findings showed the importance of routine restaurant inspection grading and disclosure practices as prevention measures and having a centralized database to manage consumer complaints as a useful surveillance tool for detecting outbreaks. Improving consumer complaint system structure and management can bolster outbreak detection and maximize limited public health resources while increasing the efficiency of complaint-based surveillance.

James R. Doty, PCAOB Chairman: 2011–2018

ABSTRACT James R. Doty led the PCAOB from 2011 to 2018. His tenure began shortly after the PCAOB withstood a constitutional challenge to its existence and in the aftermath of the Great Recession. Under his leadership, the PCAOB expanded the international reach of its inspection program through co-operative agreements with foreign regulators, the auditor’s reporting model was enhanced to provide more information to investors, and information about the engagement partner and other firms involved in audits are now required to be disclosed. Doty also brought economic analysis to bear on the PCAOB’s standard-setting process. Before Doty was appointed to the PCAOB, he was a Rhodes Scholar, a graduate of Yale Law School, a partner in the international law firm of Baker Botts, and General Counsel at the Securities and Exchange Commission.

Exploring the Integration of Unmanned Aerial System Technologies into Stormwater Control Inspection Programs

Construction stormwater best management practices and post-construction stormwater control measures are controls and techniques designed to manage and treat stormwater runoff. Departments of Transportation (DOTs) within the United States rely on these practices to treat and improve water quality emanating from DOT rights of way. To ensure operational performance, these practices undergo periodical inspections to identify if operational deficiencies exist and if corrective measures need to be deployed. The inspection process is often conducted on foot by a qualified inspector and can require a substantial labor effort to complete. Recently, unmanned aerial system (UAS) technologies have been utilized in the construction sector to survey, monitor, and improve safety. This study sought to identify and document practices regarding UAS technologies when conducting inspections of stormwater practices. Through a distributed DOT survey questionnaire (80% response rate) and four case example interviews, this study investigates how UAS stormwater inspections have been deployed by DOTs and the strategies and programs that have been adopted or created. Key findings outline (1) use of UAS technologies for stormwater inspections, (2) applying UAS technologies within a DOT, (3) staffing and equipping needs, and (4) managing UAS inspection datasets. The study also identifies challenges and implementational strategies to facilitate the development of a UAS stormwater inspection program within a DOT.

Implementation of preventive maintenance routines and the “zero breakdowns by base condition” methodology in an organization

This work has the general objective of maximizing the availability and reliability of industrial equipment, reducing the frequency and severity of failures. To achieve this objective, two specific strategies will be implemented: preventive maintenance routines and the "Zero Breakdown by Base Condition" methodology. The implementation of preventive maintenance routines consists of establishing a systematic program of inspections, lubrication, adjustments and replacement of components before failures occur. This proactive approach allows you to identify and correct potential equipment problems, preventing them from becoming critical and causing unscheduled interruptions in production. The best maintenance intervals will be studied, taking into account the characteristics and requirements of each equipment, as well as the analysis of data from previous failures. In addition, the "Zero break by base condition" methodology will be implemented. This approach involves continuous monitoring of equipment conditions using data analysis techniques. The objective is to identify abnormal patterns of operation that may indicate the potential for imminent failure. Based on this information, maintenance can be scheduled appropriately and in advance, avoiding unexpected breakdowns. Various monitoring techniques will be explored, such as vibration analysis, thermography and oil analysis, to obtain a comprehensive view of the equipment condition. The study will be carried out in a specific industry, where data will be collected on the availability and reliability of equipment before and after implementing the proposed strategies. Statistical analyzes will be carried out to evaluate the effectiveness of preventive maintenance routines and the "Zero Breakdown by Base Condition" methodology in reducing failures and increasing equipment availability. It is expected that this work will contribute to the development of more efficient and reliable maintenance practices, promoting the improvement of production processes and reducing costs associated with failures and unscheduled stops. Maximizing equipment availability and reliability will have a direct impact on the efficiency and competitiveness of the industry under study.

Sustaining Mammography Image Quality With a Technologist Coaching Program in the Era of the Enhancing Quality Using the Inspection Program (EQUIP).

To evaluate the ability of a long-term technologist coaching program to sustain gains in mammography quality made by a previously implemented quality improvement (QI) initiative. Mammography quality metrics from July 2014 to June 2020 were reviewed. Numbers of screening mammograms performed/audited, monthly average mammogram overall quality pass rates, changes in facilities/staffing, and technical recall rates were evaluated. Performance metrics at baseline (July 2013), during the improvement (July 2014 to January 2015), postimprovement (February 2015 to August 2015), and sustained coaching periods (after initiation of the technologist coaching model, from September 2015 to June 2020) were compared. During the postimprovement and sustained coaching periods, 93% (501/541) and 90% (8902/9929) of audited mammograms, respectively, met overall passing criteria, achieving or exceeding the QI goal of 90%, and results for both periods were significantly higher than that during the improvement period (74%, 1098/1489), at P < 0.0001 and P < 0.0001, respectively. The technical recall rates during the improvement and postimprovement periods were 2.6% (85/3321) and 1.7% (54/3236), respectively; the rate during the sustained coaching period was significantly lower than these, at 1.2% (489/40 440) (P < 0.0001 and P = 0.0232, respectively). Sustained quality passing rates and lower technical recall rates were observed despite statistically significantly increases in screening volumes. A technologist coaching program resulted in sustained high mammographic quality for almost 5 years.

A decay prediction model to minimise the risk of failure in timber balconies

The aim of this paper is the prediction of the life expectancy of timber balconies to minimise their risk of failure. The life expectancy is estimated considering the effects of fungal attacks on the timber structural elements. The prediction of life expectancy of timber components is set up through (i) the analysis of the state of the art, (ii) the definition of risk classes and decision trees, (iii) the prediction of the decay, (iv) the definition of an inspection procedure, and (v) the development of an adaptive monitoring plan. The the state-of-the-art analysis of the construction details that most affect durability allows for defining the risk classes and decision trees that address all the possible scenarios where water can penetrate the construction detail. The decision trees associate one of the risk classes to the detail under analysis providing a straightforward indication about the exposure of the timber structural elements to decay due to fungal attack. The allocation to a risk class allows the evaluation of the main parameters of a decay prediction model based on functions for estimating the decay rate that are available in the literature. The decay predicted and the inspection results provide the input data to the adaptive motoring plan, defining an efficient program of inspections. Case studies were selected to validate the results of the decay prediction on the outcomes of onsite inspections and to provide sample data for setting the monitoring plan.

A study on security oversight framework for Korean Nuclear Facility regulations

Nuclear security has been emphasized to ensure the safety of the environment and humans, as well as to protect nuclear materials and facilities from malicious attacks. With increasing utilization of nuclear energy and emerging potential threats, there has been a renewed focus on nuclear security. Korea has made efforts to enhance the regulatory oversight processes, both for general and specific legislative systems. While Korea has demonstrated effective nuclear security activities, continuous efforts are necessary to maintain a high level of security and to improve regulatory efficiency in alignment with international standards.In this study, the comprehensive regulatory oversight framework for the security of Korean nuclear facilities has been investigated. For reference, the U.S. regulatory oversight frameworks for nuclear facilities, with a focus on nuclear security, and the motivations of changes in regulatory oversight framework have been identified. By comparing these regulatory programs and frameworks, insights and considerations for enhancing nuclear security regulations have been identified. A comprehensive security inspection program tailored for the Korean regulatory oversight framework has been proposed, and has been preliminarily applied to hypothetical conditions for further discussion.

Evaluasi Kebijakan Pengawasan Keuangan Desa Pasca Implementasi Peraturan Menteri Dalam Negeri Nomor 73 Tahun 2020 Tentang Pengawasan Pengelolaan Keuangan Desa

Permendagri Number 73 of 2020 was established as an effort to strengthen village financial management. Law Number 6 of 2014 concerning Villages and their implementing regulations do not clearly and explicitly regulate the format and form of village financial supervision, resulting in several gaps in village financial supervision. The implementation of village financial supervision is not running as it should be due to the limited resources of the Regency/City APIP and the IT-based supervision system that is not yet optimal. At this time the Regency/City APIP in its PKPT still uses the sample method to carry out village financial supervision in one year and is post-audit in nature which is not in line with the spirit of APIP supervision which emphasizes when the activity is taking place. A critical review of Permendagri Number 73 of 2020 found two things that are research questions. First, this provision was not implemented properly by the Regency/Municipal APIP with consideration of limited resources and supervisory information technology. Second, the inspection program and procedures as stipulated in Permendagri Number 73 of 2020 are too detailed and detailed which requires audit implementers to go to the field (field audit), while APIP implementation can be carried out online because the Village Government has implemented an IT-based village finance application. The results of this research will answer some of the weaknesses of Permendagri Number 73 of 2020 as a Policy Brief to the Minister of Home Affairs to improve regulations.

Asset Assessment of Concrete Structure

Infrastructures which were constructed in the last century are approaching or have exceeded their design life. It is essential to maintain, repair and rehabilitate existing structures to ensure safety and develop a sensible rehabilitation plan. This paper suggests an inspection program for the condition evaluation of existing structures, particularly for structures that are approaching or exceeding their design/campaign lives. Cracking on concrete bridges is often induced by static and cyclic temperature loading. Throughout the service life of the structure, cracks will initiate, propagate, coalesce and form a greater damaged zone. Depending on the location and severity of the crack network; corrosion of reinforcement, debonding between concrete and reinforcement, and spalling of concrete may occur. The implementation of regular inspection or monitoring of structural condition is an essential component of asset management. Early detection of damaged zones can ease scheduling and reduce the cost of repair, which in turn also allows extension of structural lifespan without compromising safety. Similarly, for industrial properties, asset management and rehabilitation programs are paramount as they can significantly reduce capital expenditures in asset maintenance, if implemented prior to or at the early onset of structural degradation. This paper illustrates the use of NDT techniques for the condition assessment of a prestressed concrete bridge, as well as concrete storage silos. Both of which were either approaching or have exceeded their design campaign life and were needing a proper rehabilitation plan. The assessment included crack movement monitoring, crack depth determination, concrete strength estimation, and the detection of debonding between rebar and concrete.

A cooperative model to lower cost and increase the efficiency of methane leak inspections at oil and gas sites

Methane is a potent greenhouse gas that tends to leak from equipment at oil and gas (O&amp;G) sites. Conventional leak detection and repair methods for fugitive methane emissions are labor-intensive and costly because they involve time-consuming close-range, component-level inspections at each site. This has prompted duty holders to examine new methods and strategies that could be more cost-effective. We examined a cooperative model in which multiple duty holders of upstream O&amp;G sites in a region use shared services to inspect on-site equipment using optical gas imaging camera or Method 21. This approach was hypothesized to be more efficient and cost-effective than independent inspection programs by each duty holder in the region. To test this hypothesis, we developed a geospatial simulation model using empirical data from 11 O&amp;G-producing regions in Canada and the United States. We used the model to compare labor cost, transit time, mileage, vehicle emissions, and driving risk between independent and co-op leak inspection programs. The results indicate that co-op leak inspection programs can generate relative savings in labor costs (1.8%–34.2%), transit time (0.6%–38.6%), mileage (0.2%–43.1%), vehicle emissions (0.01–4.0 tCO2), and driving risk (1.9%–31.9%). The largest relative savings and efficiency gains resulting from co-op leak inspection programs were in regions with a high diversity of duty holders, which was confirmed with simulations of fictitious O&amp;G sites and road networks spanning diverse conditions. We also found reducing leak inspection time by 75% with streamlined methods can additionally reduce labor cost by 8.8%–41.1%, transit time by 5.6%–20.2%, and mileage by 2.60%–34.3% in co-op leak inspection programs. Overall, this study demonstrates that co-op leak inspection programs can be more efficient and cost-effective, particularly in regions with a large diversity of O&amp;G duty holders, and that methods to reduce leak inspection time can create additional savings.