SITE INFORMATION AND CORRESPONDENCE

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WASTE DISCHARGE REQIWMENTS • -12- STOCKTON COGENERATIt7F COMPANY SAN JOAQUIN COUNTY The Discharger shall submit to the Board on or before each compliance due date,the specified document or written report detailing compliance or noncompliance with the specific date and task. If noncompliance is reported, the Discharger shall state the reasons for noncompliance and include an estimate of the date when the Discharger will be in compliance. The Discharger shall notify the Board by letter when it returns to compliance with the time schedule. If after review of the study results it is determined that the discharge has a reasonable potential to cause or contribute to an exceedance of a water quality objective,this Order will be reopened and effluent limitations added for the subject constituents. 3. Effluent Limitation C.1 requires that the Discharger not discharge effluent with arsenic in excess of 5.0 µg/l as an annual average, total dissolved solids in excess of 450 mg/l as an annual average, or chlorine residual in excess of 0.01 mg/1 monthly average and 0.02 mg/l daily maximum, effective 18 months after permit adoption. Receiving Water Limitation F.1 requires that the discharge not cause receiving water dissolved oxygen to fall below 7.0 mg/1, and Receiving Water Limitation F.8 requires that the discharge not cause the receiving water temperature to increase more than 5°F, effective 18 months after permit adoption. It is unknown if the Discharger can comply with these limitations. Within one year of adoption of this permit, the Discharger shall submit a report providing information to show the discharge can comply with the limitations or provide a time schedule to achieve compliance with the limitations. This Order may be reopened to amend the time schedule provided in Effluent Limitation C.1 and Receiving Water Limitation F.1 and/or F.8. The schedule of compliance shall include a time schedule for completing specific actions that demonstrate reasonable progress toward compliance with the limitations and shall contain a final compliance date, based on the shortest practicable time required to achieve compliance. In no event shall the compliance date exceed 10 years from the date of adoption of this permit. 4. Any modification in chemical usage, pertaining to the discharge, must be reported to the Executive Officer in advance of such modification. The Discharger shall not institute said modification until it receives approval from the Executive Officer. 5. The Discharger shall conduct the chronic toxicity testing specified in the Monitoring and Reporting Program. If the testing indicates that the discharge causes, has the reasonable potential to cause, or contributes to an in-stream excursion above the water quality objective for toxicity, the Discharger shall initiate a Toxicity Identification Evaluation (TIE)to identify the causes of toxicity. Toxicity shall be defined as a statistically significant increase in mortality or a statistically significant decrease in growth or reproduction (p<0.05) compared to the laboratory control water. Upon completion of the TIE, the Discharger shall submit a workplan to conduct a Toxicity Reduction Evaluation (TRE) and, after Board evaluation, conduct the TRE. This Order will be reopened and a chronic toxicity limitation included and/or a limitation for the specific toxicant identified in the TRE included. Additionally, if a chronic toxicity water quality objective is adopted by the State Water Resources Control Board, this Order maybe reopened and a limitation based on that objective included.