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CENTRAL VALLEY r-GIONAL WATER QUALITY -'ONTROL BOARD <br /> INSPECTION REPORT <br /> 8 July 1988 <br /> DISCHARGER: City of Tracy Wastewater Treatment Plant <br /> LOCATION & COUNTY: Tracy, San Joaquin County <br /> CONTACT(S) : Darrell Scott, Lab Supervisor: Robert Sagaser, <br /> Environmental. Control Inspector; John Baker, <br /> Utilities Director <br /> INSPECTION DATE: 28 April 1988 <br /> INSPECTED BY: Robert Evans <br /> ACCOMPANIED BY: Same as above <br /> OBSERVATIONS AND COMMENTS <br /> This was a level "A" inspection. <br /> The City operates a secondary treatment plant featuring an activated <br /> sludge process in-series with two biofilters. The domestic sewage <br /> has grit removed in an aerated grit chamber after it passes through <br /> a bar screen or comminutor. Next, the flow goes to a primary <br /> clarifier. The industrial flows from Heinz and Laura Scudders go <br /> through a separate bar screen, grit removal chamber, and separate <br /> primary sedimentation tanks operated in parallel. Flow from the <br /> Leprino Cheese plant goes through a separate primary sedimentation <br /> unit. <br /> Industrial flows from the primary sedimentation units and the <br /> domestic flows from the primary clarifier are combined and then <br /> lifted to the top of two aerobic biofilter towers. The effluent <br /> from the biofilters goes to four activated sludge aeration basins <br /> and then to two batteries of two secondary sedimentation tanks <br /> operated in parallel . Effluent, from the secondary clarifier is <br /> chlorinated, passes through a contact basin and is then <br /> dechlorinated and discharged to Old River. <br /> The treatment capacity of the plant has been designed for a dry <br /> weather flow of 9. 0 mgd. Darrell Scott stated the plant currently <br /> receives a daily average (dry weather) flow of 6. 5 mgd of combined <br /> domestic and industrial wastewater. During our inspection, the flow <br /> was approximately 3 . 5 mgd for domestic and 0.7 mgd for industrial. <br />