In 1973 the main CAWD Water Pollution Control Plant was modified and expanded as a secondary type plant utilizing the activated sludge process for secondary treatment. The plant was designed to treat 4.0 million gallons per day (MGD) of primarily domestic wastewater. The plant has a permitted capacity of 3.0 MGD. The general layout of the plant is shown in Figures 4A & 4B. [See Figure 4A] [See Figure 4B]
Current average dry weather flow (ADWF) is approximately 1.1 MGD which represents 36% of the permitted capacity or 28% of design capacity. Of the 1.1 MGD, approximately two-thirds is from CAWD customers and the remaining one-thrid is from Pebble Beach Community Service District customers.
During large storm events the inflows can increase three or four times the dry-weather rates. This stresses the plant but this can be managed while still meeting environmental water quality discharge standards.
In 1994, tertiary level treatment was added to reduce and replace the use of potable water on golf courses in Pebble Beach.