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This engineering review is supplemented to a great degree b a Report of Waste Discharge (RWD) y ) prepared for the site in June 1988 by the San Joaquin County Department of Public Works. The (RWD) is in the process of being submitted by the City of Tracy to the RWQCB. References will be made to specific sections or Appendices of this RWD for information required in this engineering review. A copy of this RWD is included as Attachment C of this Engineering Review. However it is bound separately due to its large size. The format of the Engineering Review below generally follows the instructions in guidance documents furnished by the LEA. A copy of these instructions are contained as Part I of Appendix E. Section XIII of this report, which contains conclusions and recommendations, is an engineering evaluation of the site performed by the author of the Engineering Review. The conclusion of the report indicates that the landfill operations meet state minimum standards, and also that the proposed monitoring for the landfill, when implemented, will satisfy state standards for site monitoring. In addition, recommendations are made to improve site operational efficiency and control. The engineering evaluation was performed using applicable guidelines contained in Title 14 of the CCR, Chapters 3 and 5; Title 23 of the CCR, Chapter 3, Subchapter 15; Solid Waste Enforcement Manual 1986. by the CWMB, and also inspection reports for the landfill on file with the LEA. Recommendations were made based on site observation and engineering report reviews performed by the certifying engineer for this Engineering Review. A. History of past operation: The Corral Hollow Sanitary Landfill began operations approximately around 1950. The history of operations for the site from that time through the 1970's is not well documented. Appendix F contains a brief summary of the history of the site as researched by the County and transmitted to EMCON Associates in January 1988 for use in the preparation of the Closure Plan for the site. Attachments to this history also indicate property limits of the site over the site history. County and City of Tracy files show the earliest reference to the disposal site being an agreement dated January 16, 1950, between the County and City. Since then, the disposal site has been operated by the City of Tracy under an agreement where the County and City are co-owners. The site was generally run by a caretaker during the 1950 's and early 1960 's and dumping was free of charge. Operations included open dumping, with occasional burning and covering of waste. 10