The existing collection system is one of the oldest in the State with approximately half the manholes being the older brick type and most of the pipelines being of the old vitrified clay type. Deterioration of the mortar holding the manhole bricks together by gases produced in the sewer system and intrusion of roots into the joints of the older pipelines are the major reasons for replacement or rehabilitation.
The CAWD collection system is comprised of approximately 81 miles of gravity sewers ranging in size from 6 inches to 27 inches in diameter together with nearly 4 miles of force mains, 7 pump stations, and over 1,500 manholes.
The major trunk sewers include the Carmel Valley Interim Trunk Sewer which serves Rancho Rio Vista, portions of Carmel Views, the Carmel Rancho Shopping Center, Hacienda Carmel, Del Mesa Carmel, Quail Meadows and outlying areas at the mouth of the Carmel Valley; the Hatton Canyon Sewer (which joins the Carmel Valley Trunk sewer at the intersection of State Route 1 and Rio Road) serves the High Meadows, Carmel Knolls and portions of the Carmel Hills subdivisions; two trunk sewers serve the city of Carmel and the Hatton Fields areas. The Carmel Meadows subdivision is sewered separately.
Pump stations are located at (1) the westerly boundary of Hacienda Carmel, (2) the westerly terminus of 8th Avenue (at Scenic Drive), (3) the intersection of Monte Verde Street and Sixteenth Avenue, (4) west side of Scenic Road approximately 200 feet north of Ocean View Avenue, (5) the end of Calle La Cruz (Carmel Meadows) (6) at the westerly boundary of the Carmel Meadows subdivision approximately 750 feet southwesterly of the Calle La Cruz pump station and (7) on the West side of Highlands Drive approximately 100 yards from Highway 1. All pump stations have been upgraded to allow remote monitoring and have capabilities for standby power and emergency bypass.
The District has an ongoing 5 year collection system capital improvement program and replaces or rehabilitates pipelines at the rate of 1,000 to 4,000 feet annually. Manholes are replaced as necessary.
The five person collection system maintenance crew cleans the entire system a minimum of once annually and performs routine repair work as necessary.