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WASTE DISCHARGE REQUIREMENTS 2 UNIVERSITY OF CALIFORNIA LAWRENCE LIVERMORE NATIONAL LABORATORY EXPERIMENTAL TEST SITE AND U.S. DEPARTMENT OF ENERGY ALAMEDA AND SAN JOAQUIN COUNTIES 883 and operated under RCRA Title 3 . Construction activities resulting in ground disturbance of five acres or greater will not be covered by this permit but will continue to be permitted separately on a project -by -project basis. 3. The State Water Resources Control Board (SWRCB) adopted Order No. 91-13-DWQ, General Permit No. CAS000001 (General Permit) 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. LLNL submitted a Notice of Intent on 27 March 1992, requesting storm water discharges from Site 300 be covered under the General Permit. This order further specifies 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 storm water relieves the Discharger from seeking coverage under the General Permit. 4. Site 300 is in Sections 15, 16, 17, 20, 21, 22, 26, 27. 28, 29, 33, 34 and 35, T3S, R4E, MDB&M. Towers B-801 and B-865 are in Section 16, and Tower B -836A is in Section 26. Tower B-801, Tower B -836A and Tower B-865 will discharge to SWDC on a regular basis. 5. Untreated blowdown from Tower B-801, Tower B -836A, and Tower B-865 is discharged into SWDC, roadside ditches which drain to Corral Hollow Creek, tributary to the San Joaquin River, a water of the United States. Corral Hollow Creek is an ephemeral stream which soaks into the ground approximately 6 miles northeast of Site 300, except under severe storm conditions when water from Corral Hollow Creek could reach the San Joaquin River. 6. Attachment B lists the blowdown water quality from Tower B-801, Tower B -836A, and Tower B-865 based on data collected in 1991 through 1993. The water quality data was collected while the cooling towers operated using ground water from the existing drinking water supply system. 7. Tower B-865 has the greatest blowdown flow rate. Design blowdown flow rate is 24,000 gallons per day (gpd). Current blowdown flow rate in hot weather based on 1993 monitoring data is approximately 9,000 gpd and in cool weather, approximately 3,000 gpd. The maximum blowdown flow rate for 1993 was 11,000 gpd. 8. Currently, NALCO 2896, a corrosion inhibitor, and chlorine, a disinfectant, are added to all cooling towers for corrosion and biological control. NALCO 2896 is added to maintain a concentration of product at about 80 to 100 ppm. Approximately