 The business activities of IT fell under strict regulation by the Bay Area Air Quality Management District and the State of California Regional Water Quality Control Board, as well as the Contra Costa County Health Department.The proximity of the Martinez ponds to sensitive receptors including residences, led to odor complaints from individuals, especially on low wind velocity days when the ponds were upwind of residences.IT established an "on call" air monitoring response to test odor whenever the city of Martinez received a citizen complaint.