Laserfiche WebLink
�Ilemorand- u- m <br /> -- - - - - <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. Vorster FROM: Dave L. Brent <br /> Senior Engineer Project Engineer _ <br /> DATE: 15 January 1987 SIGNATURE: <br /> SUBJECT: FIRE PROTECTION SYSTEM, PGandE, MC DONALD ISLAND <br /> In March 1986 PGandE completed a two-day annual performance test of their <br /> firewater protection system. They submitted a report with the findings of the <br /> water quality investigation performed in conjunction 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 a 12-inch pipeline and 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 into Turner Cut Slough about 1/2 mile downstream from the intake. <br /> The water quality investigation consisted of general mineral analysis; inorganic <br /> and organic analysis; pesticides; PCBs and purgeable priority pollutants <br /> analysis; and a 96-hour, percent survival bioassay test for all samples. Five <br /> samples were taken; they consisted of the following <br /> 1. A background sample taken at the intake 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 />__ ��.---���-.�--e-.wa--....- ��rrr-�'s+ss-�—s"E'�:r�-��.�ir^'�—tLSC^:T�_•�_+-r',^'�s--3"'"�r^�...,,n,-.�..,�.-n.y__r.�.-.-_..e• <br />