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will utilize U.S. Geological Survey ("USGS") topographic quadrangle maps to identify potential receiving streams and their anticipated characteristics, in terms of flow conditions, and/or any ponds that appear on the maps. In addition, the Engineer will review available, recent aerial photography to determine whether any new ponds have been created that are not shown on the USGS map. The Engineer may eliminate receiving streams with discharge impediments, such as on-channel ponds from further consideration. 1.4.2 Schedule a field reconnaissance trip once the potential receiving streams have been identified. The Engineer will visually inspect potential receiving streams from publicly accessible locations (generally limited to road crossings). At this stage, the Engineer will not pursue rights-of-entry for any of the options. Based on the results of this field reconnaissance trip, the Engineer will develop a default water quality model for the potential receiving streams using generally accepted parameters and best judgment, based on available information. The Engineer anticipates that two models may be required; one for Cottonwood Creek, and possibly one for the San Marcos River and these models may have more than one alternative discharge location. This field reconnaissance is intended to provide a generalized analysis of the potential assimilative capacity of the receiving water and likely discharge quality requirements in terms of biochemical oxygen demand, ammonia-nitrogen, and dissolved oxygen. 1.4.3 Once a recommended alternative site is identified and accepted by the City, conduct a second field reconnaissance trip to verify the character of the stream. For this second trip, the Engineer anticipates that the City will be in contact with the landowner to obtain a right-of-entry to observe and take measurements of the stream downstream of the proposed discharge. The Engineer may adjust the default model based on the results of the second reconnaissance trip. In addition, the Engineer will assess the potential for current or future nutrient limits based on the current regulatory framework, as well as anticipated changes to that framework. 1.4.4 Provide the City with electronic copies of the following deliverables: a) Technical memorandum documenting potential receiving streams and their associated characteristics; b) Initial reconnaissance trip technical memorandum including findings and recommendations; c) Water quality modeling report documenting receiving water's potential assimilative capacity; and d) Technical memorandum documenting the results of the final reconnaissance trip of recommended site to verify stream conditions. The Engineer may perform additional modeling based on results of this trip. 1.5 TASK 5 - ALTERNATIVE SITE IDENTIFICATION The Engineer will: 1.5.1 Based on the results of the Alternative Discharge Evaluation and the established minimum criteria, conduct an initial screening of potential sites within an area defined by the W W WTP Site Location Assessment - CH2M Hill 5