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-INTRODUCTION Chesney Consulting has been retained by Mr. Harold Lepelley, owner of the County Manor Mobile Home Park (CMMHP) in Lockeford, CA to conduct an investigation of the Onsite Wastewater Treatment System (OWTS) that is currently operating at the CMMHP facility. The purpose of this investigation was to determine the functionality of the existing Nottingham Wastewater Treatment System by comparing raw sewage influent constituents with the effluent constituents after treatment by the Nottingham system. System diagrams, and disposal area schematics are found in Appendix B. This System was installed in 1971 and is approaching the end of its lifespan. It is becoming uneconomical with continual maintenance and repair issues and its treatment efficiency is questionable. Consequently, Mr. Lepelley and Mr. Jim Genn - who assists Mr. Lepelley with the operation and maintenance of the system, have decided to investigate the possibility of updating the OWTS. Mr. Lepelley and Mr. Genn are interested replacing the Nottingham System with a conventional system consisting of low, well-defined maintenance, but were unsure of the viability of such a system and whether it will comply with San Joaquin County Environmental Health Department (EHD) requirements. Subsequently, the EHD administration was contacted to inform them of this Phase I project, what is to be accomplished, and to ensure compliance with EHD rules and regulations after their review of this document. Phase II of this project will be the design and installation of a new OWTS, provided approval of this document is obtained from EHD. In addition to investigating the wastewater treatment system, the effluent receiving soils were sampled and tested for the ability to further treat the effluent and determine if the soils can mitigate adverse effluent constituents, particularly nitrate-nitrogen. Soil test results indicate mitigation of nitrate-nitrogen, ammonium-nitrogen, and organic-nitrogen concentrations. MATERIALS AND METHODS The investigation began with reviewing the construction diagrams of the Nottingham Treatment System. Sampling began by using a telescoping pole and sampling at mid-depth of the raw wastewater influent, 2,000 gallon septic tank. This tank can be considered the headworks trash tank by receiving wastewater inflows from all 40 mobile home units. Daily flow volumes were not quantified for this document. After the sampling of the raw influent, treated effluent was then sampled from the "final tank" of the Nottingham system, also from the mid-depth point of this final tank. All sample containers, with proper preservative (if required) were provided by Precision Enviro- Tech of Stockton, CA. After sampling, the samples were transported to Precision Enviro-Tech in a cooled ice chest, under the attached Chain of Custody. Test Results for each constituent tested is illustrated in Table I below, and are denoted as OWTS Influent and OWTS Effluent. These test results were also compared with data obtained from Small and Decentralized Wastewater Management Systems by Crites and Tchobanoglous (Ref. 2), Table 4-16: Page -1- Chesney Consulting