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STAIE,�F CALIFORNIA ` GEORGE DEUKMEJIAN, Goveriw 1--ALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— 'CENTRAL VALLEY REGION 3443 ROUTIER ROAD SACRAMENTO, CA 95827-3098 JAN 2 6 1957 ENVIROMENTAL HEALTH PERMIT/SERVICES 22 January 1987 Mr. Victor C. Furtado, Manager Environmental Services Pacific Gas and Electric Company 77 Beale Street San Francisco, CA 94106 FIREWATER PROTECTION SYSTEM, MC DONALD ISLAND, PG AND E, SAN JOAQUIN COUNTY As you requested, we have reviewed the water quality investigation report you prepared in conjunction with the 19 March 1986 test of the firewater protection system at the subject facility. Based on your reported findings, as presented in the previously mentioned report, we feel that the annual performance test of the firewater protection system will have no significant impact on water quality. Therefore, we are conditionally waiving waste discharge requirements (WDRs) on a one-time basis. WDRs may be issued at a later date if Regional Board staff determines, due to a change in the discharge or new findings, that the discharge adversely impacts waters of the state. All regulations and requirements of the Department of Fish and Game and any other agencies must still be observed. In addition to notifying this office at least a week in advance of the performance test, the following conditions must be met: 1. A justification for the amount of corrosion inhibitor added to the system. The manufacturer's instructions are not clear on how the dosage is deter- mined. This should be determined and the results submitted to this office before the next discharge. 2. A maintenance plan is to be implemented that will keep possible platform contaminants from being discharged. 3. A monitoring program is to be carried out using the same locations and time intervals as the 1986 test. In addition, samples must be collected from the point of discharge. You are to test all samples for heavy metals (ICAP) and any other contaminants that may be associated with the operation. 4. Include items 2 and 3 in a report to be submitted to this office within 60 days of test completion. Include results of the monitoring program, a log of the test's events, and conditions of receiving waters during the test.