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Mr. Gary A. Leach <br /> February 1, 1988 <br /> Page 2 <br /> <br /> 3. Trunk Sewer Rehabilitation--Provide more explicit recommen- <br /> dations on suggested steps that Pleasanton should take to <br /> further evaluate in more detail the condition of the 33- <br /> inch-diameter East Amador Trunk Sewer (EATS). Develop <br /> suggested alternative cleaning methods and approximate <br /> costs. <br /> <br /> 4. Pumping Station Alternatives Analysis--Expand the number of <br /> alternatives analyzed from two to five, including the <br /> following: <br /> <br /> A. Construct a new combined flow station on DSRSD site <br /> adjacent to the existing station. <br /> <br /> B. Construct a new combined flow station on the Pleasanton <br /> property just east of the existing station. <br /> <br /> C. Construct a new combined flow station near the plant <br /> entrance. <br /> <br /> D. Construct interim modifications to the existing station <br /> and build a combined flow station in ten years. <br /> <br /> E. Rehabilitate the existing station to provide an <br /> additional 20 years of life (if possible) and build a <br /> station for the relief sewer flows when necessary. <br /> <br /> Alternatives A and B have been addressed in the draft <br /> report. Alternative D has been addressed in lesser detail <br /> in Appendix B of the draft report, but may have to be <br /> modified after development of Alternative C. <br /> <br /> Alternatives C and E are new alternatives that will require <br /> additional study. We will analyze the impact that these <br /> alternatives have on the creek-crossing requirements, EARS <br /> and EATS extensions, ease of construction, and other <br /> factors. Alternative E may require estimating costs for a <br /> smaller station because we anticipate that the relief sewer <br /> station would be smaller than the combined flow station. <br /> We will also review the December 1957 Final Draft of the <br /> DSRSD Sewer Master Plan to determine the impact that other <br /> developments may have on available capacity in the DSRSD <br /> 42-inch-diameter raw sewage trunk sewer. <br /> <br /> For Alternative E, we will conduct a more thorough review of <br /> the existing station to determine other necessary rehabili- <br /> tation steps (e.g. wet well repair or enlargement, control <br /> replacement, lift replacement) to extend the station life to <br /> about 20 years. We will estimate capital costs for each of the <br /> alternatives. <br /> <br />BROWN AND CALDWELL <br />P O BOX 8045 WALNUT CREEK. CA 94596-1220 · [415) 937-9010 TELEX 33-6490 · OFFICE AT 3480 BUSKIRK AVENUE PLEASANT HILL 94523 <br /> <br /> <br />