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CALIFORNLA, REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 94-101 WASTE DISCHARGE REQUIREMENTS FOR HOUSING AUTHORITY OF THE COUNTY .OF SAN JOAQUIN HOUSING AUTHORITY THORNTON SEWER PLANT SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. The Housing Authority of the County of San Joaquin (hereafter Discharger) submitted a Report of Waste Discharge, dated 8 February 1994, for their wastewater treatment and disposal facility. The property is owned by the Housing Authority of the County of San Joaquin. 2. Waste Discharge Requirements Resolution No. 58-568, adopted by the Board on . 21 November 1958, prescribes requirements for a discharge from a wastewater treatment facility to land. 3. Resolution No. 58-568 is neither adequate nor consistent with current plans and policies of the Board. 4. The Housing Authority Thornton Sewer Plant serves a farm labor community of approximately 300 persons. The Discharger disposes of 0.0294 mgd of domestic sewage to land. The facility consists of a Imhoff tank ( flow chamber capacity, 820 cu. ft., and sludge chamber capacity, 1390 cu. ft.) and evaporation / percolation ponds ( 2.98 million gallons capacity). The sludge is drained from the chamber once per month and dried on-site. The wastewater treatment facility is properly fenced. 5. The sewer ponds were relocated in 1978 west of the Interstate 5 Freeway. The relocated ponds were designed by the California Department of Transportation. In 1983, the ponds' depths were increased to two feet. During the heavy rainy season, the facility has encountered a rise in ground water, which prevents the wastewater from percolating properly. The ponds' freeboard is monitored daily. 6. The Housing Authority Thornton Sewer Plant is in Section 10, T4N, R5E, MDB&M, with surface water drainage to Beaver Slough, as shown in Attachment A, which is attached hereto and part of the Order by reference. 7. The Board adopted a Water Quality Control Plan, Second Edition, for the Sacramento-San Joaquin Basin (hereafter Basin Plan), which contains water quality objectives for all waters of the Basin. These requirements implement the Basin Plan.