If you look at the eBird hotspot map, there is no reason to use the generic area spot—pick one or more of the other specific hot spots for your checklist.

When submitting eBird observations at Sunnyvale Water Pollution Control Plant (WPCP), it is most helpful to start a new checklist for each hotspot in the area. Use the general hotspot when you have a checklist that includes multiple locations or if no other hotspot or personal location is appropriate for your sightings.

The closest parking for all the Sunnyvale WPCP hotspots is on Carl Road View Map, 

The Sunnyvale Water Pollution Control Plant is an advanced wastewater treatment facility that serves the City of Sunnyvale and its surrounding areas. The plant was built in 1956 and is undergoing a 20-year improvement program to upgrade its infrastructure and technology. The plant uses a unique controlled-ponding system to remove pollutants from wastewater and produce recycled water and biosolids. The plant also utilizes biogas from its anaerobic digesters and the adjacent landfill to generate most of its energy needs. The plant aims to protect the environment and public health by meeting the standards set by the San Francisco Regional Water Quality Control Board.