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Engineering Review Page 2 April 16, 2003 Century Farms North (1st -6th Additions) 3. A traffic study for this area was previously prepared by SRF Consulting Group, and reviewed by TKDA. The study primarily addressed the issue of an east -west connection between Sunset Avenue and 4th Avenue in this area. Carl Street and other alternatives were addressed. It has been recommended that the street and utility plans be designed in a manner that will allow for a future connection to Carl Street and extension of utilities. However, pIn Zn tg has recommended that the Carl Street connection not be made. 4. The Geotechnical Report provided is based upon seven (7) borings conducted in 1998. As stated in their report, Braun Intertec advises that they be allowed to review final design plans prior to construction due to the limited amount of design information available at the time of their investigation. In addition, Braun advises that their recommendations again be reviewed upon establishment of final building grades, house types, and utility designs. Additional borings and piezometer tests may be necessary, particularly in view of the relatively high groundwater levels observed at the time of testing in 1998. ENGINEERING REVIEW COMMENTS: 1. Sanitary Sewer System - Plan Sheets Ul and U1A through U1D:' A. The existing sanitary manhole invert elevation located at the intersection of Pinto Lane and Mustang Lane has been revised to the correct elevation of 892.25, per available records. Per previous review and discussions, a sewage lift station will be required, and is shown on the plans. A review of the proposed sanitary sewer system is being undertaken to take into account not only the Century Farms North subdivision; but also future needs of currently undeveloped and adjacent un- sewered areas. That is, sanitary sewer system trunk and lateral lines along with pumping lift station(s) need to be sized, depth determined and alignments chosen with future use considered beyond the subdivision boundaries, in accordance with the City's Comprehensive Plan. Upon further preliminary design of the lift station, the location of the lift station may be subject to change as well. B. The utility plans received show proposed pipe sizes with minimum slopes and proposed manhole locations. Manhole rim and invert elevations are not shown on the plan, but have been provided on a separate sheet. Specific invert elevations for structures on Century Trail (15 -inch diameter trunk sewer) will be verified upon preliminary design of the proposed lift station. As previously mentioned, sizing of the 15 -inch diameter main (that will also serve future growth) will also be verified in conjunction with sizing the lift station. However, manhole structures and 8 -inch diameter lines specific to Century Farm North and feeding to the trunk line, can and should be identified with proposed invert elevations accordingly. It is expected that all structure elevations (rim and inverts) will be shown on the plans as they are further prepared for construction purposes. C. The 8 -inch diameter sanitary sewer on Century Trail and west of Pinto Trail must be reviewed and addressed further to assure that any possible future sewer needs on Sunset Trail may be accommodated accordingly.