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*Aemoran-d-u-m-_0___ <br />CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION <br />3443 Routier Road Phone: (916) 361-5600 <br />Sacramento, CA 95827-3098 ATSS: 8-495-5600 <br />TO: Antonia K. J. VorsterFROM: 'Dave <br />Senior Engineer Project Engineer <br />DATE: 15 January 1987 SIGNATURE: <br />SUBJECT: FIRE PROTECTION SYSTEM, PGandE, MC DONALD ISLAND <br />In March -1986 • • • completed . two-da <br />firewater protection system. They submitted a report with the findings of the <br />water quality investigation performed in conjdnction with the performance test <br />and requested to meet with us to discuss a waiver of waste discharge require- <br />ments for the discharge from this operation. The meeting was tentatively set <br />for 21 November 1986 but was determined,unnecessary and cancelled. <br />During the annual performance test,and when required for fire protection, the <br />system draws water from Turner Cut Slough through two vertical turbine pumps at <br />a combined rate of 4,000 gpm. The water is delivered to the Turner Cut and <br />Whiskey Slough platforms by pipeline • sprayed in a mist over the <br />platforms. A corrosion inhibiting compound at concentrations up to 600 ppm is <br />added to the system after each test or fire event and stored until discharged <br />during the next use of the system. The drainage from this operation travels <br />through a storm water drainage system, into irrigation ditches and eventually <br />back ♦: Turner Cut Slough about ♦ downstream <br />samplesThe water quality investigation consisted of general- mineral analysis; inorganic <br />and organic analysis; pesticides; PCBs and purgeable priority pollutants <br />and a 96 -hour, percent survival bioassay te.st for all samples. Five <br />of i. i <br />1. 1 background t • prior to the test. <br />2. A composite sample collected from the initial runoff of the Turner Cut, <br />platform. <br />3. A composite sample collected from the sustained runoff at the Turner Cut <br />platform. <br />4. Same as No. 2 at the Whiskey Slough platform. <br />5. Same as No. 3 at the Whiskey Slough platform. <br />F�„ W . c ate:! .: .m1 F ;L?a4 ..ww •. 9' fro' ttf ...ii-�..t%sj�`w.. <br />"4 <br />