Which of the following can be considered potential pollutant sources stored on a construction site?

The answer that includes petroleum storage tanks, soil amendments, and masonry materials is considered correct because these items have the potential to contribute to water pollution if they are not properly managed. Petroleum storage tanks can leak or spill, releasing harmful substances into the environment. Soil amendments, such as fertilizers, may contain chemicals that can run off into waterways during rain events, contributing to nutrient pollution and possibly harming aquatic ecosystems.

Masonry materials, while they may not seem hazardous at first glance, can also contribute to sediment pollution and other issues if not controlled on-site. Collectively, these items represent a significant risk to stormwater quality due to their ability to introduce pollutants into the stormwater system.

The other options, while they may be present on a construction site, do not typically pose the same level of risk for stormwater pollution. Construction tools and electrical equipment are primarily operational items and do not have the same potential for releasing hazardous substances into stormwater runoff. Thus, option B stands out as identifying specific materials that could lead to potential pollution sources.