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Etiwbbey .� Ford A member d the Pilk,,KjM G.p Libbey-Owens-Ford Co: 500 East Louise P.O.Box 128 Lathrop,California 95330 March 13 , 1988 Tel 209/858-5151 D X 510/762-6630 09/858-2024 Mr . Robert Niblack : California Regional Water Quality Control Board 144P Central Valley Region fQ? 3443 Routier Road N Sacramento, CA 95827-3098 Ny1R��fFfR1N1T"V7-AL i.Ir S NPDES PERMIT NO. CA0004839 Dear Mr . Niblack : Please find enclosed our discharge monitoring reports for the month of February, 1988 . On February 16 , we experienced a BOD of 200 mg/l in the effluent of our Sanitary Waste Treatment Plant. This effluent is held in our retention reservoir before discharge to the river . The sample from the reservoir on the same day had a BOD of 2 mg/1 . We believe this problem was caused by a sudden very high flow of waste into the sanitary plant when a level control malfunctioned and caused some organic material to flow into the chlorination basin. The retention time and volume of the chlorination basin is such than adequate disinfection probably occurred. The volume involved was probably around 500 gallons which is probably too small to be detected in the river discharge BOD sample . We are in the process of installing a new level control system for our sanitary plant . On February 2 , and February 16 , we exceeded our limits for suspended solids . We are investigating whether engineering controls may be necessary to prevent future recurrences of this problem. On February 2 , it was noticed that the river at the R-2 location was extremely cloudy due to a motor boat that was maneuvering in the area . Our sample at this time indicated a high turbidity, on the same day foam was also noted to cover an area of roughly 20 , x 50 , near our discharge pipe . We ran Methylene Blue Active Substance analyses on the River and our discharge for that day and found none detectable ( <0 . 02 mg/1 ) at both of the river sampling locations and 0 . 02 mg/l on our discharge water . We use about one pound of detergent/day containing a small amount of surfactant . Our Janitor was asked about any excessive use of janitorial products and he indicated no unusual activity. We do not believe this to be a problem of deleterious additions to the river but rather a circumstance of turbulence and foaming due to air injected into the effluent. We will continue to observe this phenomena and make corrections should it be regarded as unsightly. PI LKI NGTON