At the construction site, there are many factors a project manager needs to consider i.e. the build-up time scale, the weather, the build quality and so on. The last thing that the project manager should be of concern is of the site's security, the safety of employees and the risk of theft and Arsene.
The project manager must have a security strategy for the duration of construction builds, with a particular construction of security services in mind. Do take CPTED, "crime prevention through environmental design" or hire a professional security firm. You can check security services through Gate Guard Services.
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With CPTED in mind, the environment is a key factor to deter potential criminals and should be the construction of security services in itself. The site design should be an open space, with a parameter fence and plenty of lighting day and night. Fences should be more than 7 feet tall so that pedestrians do not have instant sightings of the construction site and the assets in it.
There is also a need to turn the lights on throughout the site; about the parameters of the site, the building and at the site entrance and exit. During the initial designing period, it may be worth bringing a security consultant to review the plan and discuss where further professional security services can be applied.