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Vulcan Chemical Pechnologiet. Inc. August 20, 1996 ' E CE I VE D AUG 2 2 1996 MUNICIPAL U-1 JU DIES Ms. Diane M. Hinson, R.E.H.S. Regulatory Compliance Officer City of Stockton, Dept of Municpal utilities 2500 Navy Drive Stockton, CA 95206 Dear Diane: In your recent discussion with Mark Barkley, you had requested a written update as to the amount of sodium chlorite spilled in the August 12th episode at West Lane & Mosier. As you and Mark had discussed, it is not possible for us to determine the exact amount of chlorite spilled. However, we can supply a range which is based upon the estimated amount of chemical that was in the tank. Our driver delivered chlorite to West Lane & Mosier station on Fridav, August 9th at approximately T00pm. There was no leak at this time. The tank was filled to approximately 1500 gallons by visual inspection. The pump has been set to pump at approximately 105 gallons per day. The spill was discovered at approximately 10:00am on Monday, August 12th. Based upon the 105 gpd pump rate, 280 gallons was pumped during this 64 hour span. Although approximately 280 gallons was pumped, we cannot determine what percentage of this was pumped to the sewer or to the ground. The amount of chlorite removed from the tank after the leak was between 1200 and 1300 gallons. In addition, there was between 1=_' inches of chlorite left in the tank which could not be pumped. Base upon pump rates and chemical inventory, we can only advise you that less that less than 280 gallons was spilled. Without determination of the time of sabotage, we cannot supply the precise volume of chemical spilled to the ground. Please call with any further questions or concerns. Sincerely, Chadd Hermann Regional Sales Manager cc. Mr. Jim Butler. City of Stockton Mr. Mark Barkley, VCT Mr. Peter Deacon, VCT 1902 Channel Drive, West Sacramento, CA 95691-3477 / (800) 877-5022 1 (916) 375-0167 / (916) 372-0836 • FAX