CHEVRON OWNS AND OPERATES 8 PETROLEUM LIQUID STORAGE VESSELS AT THE REFINERY IN RICHMOND, CALIFORINA. THE STORAGE TANKS AT THESE FACILITIES CONTAIN PETROLEUM LIQUIDS IN VARIOUS FORMS SUCH AS GASOLINE AND CRUDE OIL. EIGHT OF THESE TANKS ARE SUBJECT TO THE NSPS STANDARDS AT 40 C.F.R. SUBPARTS KA AND KB. THESE SUBJECT TANKS ARE EQUIPPED WITH AN EXTERNAL FLOATING ROOF AND A SLOTTED GUIDEPOLE THAT EXTENDS THROUGH AN OPENING IN THE ROOF. THE SLOTTED GUIDEPOLE IS USED AS A SAMPLING WELL. CHEVRON INSTALLED INTERNAL SLEEVES IN THE SLOTTED GUIDEPOLES TO MINIMIZE EMISSIONS TO THE ATMOSPHERE. ALTHOUGH THE SLEEVES CONTROL ADDITIONAL EMISSIONS, THERE IS STILL ONE REMAINING VISIBLE GAP, IN VIOLATION OF NSPS SUBPART KA AND KB. CHEVRON IS SUBJECT TO EFFLUENT LIMITATIONS AND OTHER CONDITIONS SET FORTH IN ITS NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM PERMIT. CHEVRON VIOLATED THE CLEAN WATER ACT BY FAILING TO COMPLY WITH ITS NPDES PERMIT TERMS AND CONDITIONS. GENERALLY, CHEVRON EXCEEDED ITS PERMIT LIMITS FOR SELENIUM, NICKEL, PH, CYANIDE, MERCURY, ACUTE TOXICITY, AS REQUIRED BY ITS NPDES PERMIT. IN ADDITION, CHEVRON'S PARTIAL BYPASS OF ITS GAC TREATEMENT SYSTEM IS A VIOLATION OF AN NPDES PERMIT CONDITION PROHIBITING BYPASS. THERE HAVE BEEN SEVERAL RELEASES AT