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1 � <br />w <br />Memo to Antonia Vorster -3- 15 January 1987 <br />All • - -• show decreased concentrations between s and <br />general,sustained flows except the lead concentrations at the Whiskey Slough platform. <br />In addition, all lead values from the runoff samples exceed the fresh water <br />aquatic life, 4 -day average protection criteria. The Increase of the concentra- <br />tion at the Whiskey Slough platform indicates the 4 -day average may be exceeded. <br />The increase may be due to paint on the platform and sloppy "housekeeping". <br />In • •ns were higher in the initial samples <br />sustainedthe samples. This is most• '• by presence of <br />corrosion • f pipelines • the rinsing of i' <br />collected i platforms <br />Due to the infrequent use of the firewater protection system, the limited flow <br />(two 24-hour days at 4,000 gpm), and the similarity between background and <br />sustained flow water quality, I feel there will be no significant impact on <br />water quality and we can waivedischarge requirementsfor <br />operation <br />However, we should request the following from PGandE: <br />1, Determine why the levels of lead increased at the Whiskey Slough platform <br />and how, if possible, they can be decreased. <br />2. A maintenance pian to keep the platforms as free of debris as possible. <br />3. A justification of the concentration of corrosion inhibitor being used to <br />protect the system. <br />. Monitoring of initial and sustained runoff of each platform for heavy <br />metals (ICAP). <br />DLB:jj <br />o-,, J.ur.�, .,. ,_f�:. >..:;:�,.sm.�...�`�'::s �� .,._K2 ,..x �,.:.f ,x,>«���. xY e3 .vk"...'_k� ,,. `Xs. .. r ,..€,t, �^;-r=»ro.;*�v ..��s�•c - «t Uzi" -x:', "�, s'.,.�.r.�-. .a,a.✓'��i.a��F�`-e.;:�'.���d .sit£?�..�.as"�*� <br />