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Plant Overview and Capacity

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.

A schematic diagram and Hydraulic Profile of the treatment facility is shown on Figures 5 and 6 and a basic description of the individual unit processes follows: [See Figure 5] [See Figure 6]

In 1994, tertiary level treatment was added to reduce and replace the use of potable water on golf courses in Pebble Beach.

Figure 4B
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Figure 4A
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Figure 5
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Figure 6