SITE INFORMATION AND CORRESPONDENCE 1980-1999

Home Browse Search

WASTE DISCHARGE REQUIREMENTS CITY OF LODI WHITE SLOUGH WATER POLLUTION CONTROL PLANT SAN JOAQUIN COUNTY -4- 21 . The State Water Resources Control Board adopted Order No. 91-13-DWQ (General Permit No. CAS000001) specifying waste discharge requirements for discharges of storm water associated with industrial activities, excluding construction activities, and requiring submittal of a Notice of Intent by industries to be covered under the permit. This Order further specified that if an individual permit is adopted for storm water runoff from a facility, then the General Permit would no longer apply. This individual permit and the provisions it contains concerning stormwater relieves the Discharger from seeking coverage under the General Permit. CEQA 22. The action to adopt an NPDES permit is exempt from the provisions of the California Environmental Quality Act (Public Resources Code Section 21000, et seq. ) , in accordance with Section 13389 of the California Water Code. 23. San Joaquin County has certified a final environmental impact report (EIR) and a supplemental EIR in accordance with the California Environmental Quality Act (Public Resources Code Section 21000, et seq. ) , and the State Guidelines. The project may have the following significant impacts on water quality: a. Potential contamination of groundwater or Interstate 5 borrow pits with nitrogen compounds and other pollutants if agronomic rates of effluent and sludge application are exceeded on the City-owned agricultural fields. b. Potential health hazard for full water contact recreationists in Dredger Cut. c. Potential decrease of dissolved oxygen in White Slough and Bishop Cut due to an increase in pollutants (BOD and suspended solids) discharged. 24. The Board has reviewed the EIR and Supplemental EIR, and these waste discharge requirements will mitigate or avoid the significant impacts on water quality listed in Finding 23. PUBLIC HEALTH AND CHRONIC TOXICITY 25. Effluent limits in this permit for disinfection and chronic toxicity are based on existing flow regimes in Dredger Cut, Bishop Cut, and White Slough. The existing data include a single determination of dilution over a tidal cycle, which may not be an accurate representation of available dilution during different seasons, at the higher flow rates allowed in this Order, or may not take into account irrigation pumping on Dredger Cut. The data indicated the average dilution over a 25-hour tidal cycle at the inlet to Dredger Cut to be 10:1, and in Bishop Cut to be greater than 20: 1, with effluent flows from the treatment plant at 6 mgd. This Order requires further dilution studies be conducted to verify if original estimates are correct.