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1 kennedy/Jenks Consultants Jon Lynch City of Redwood City 16 October 2003 Page 2 Based on your request not to include the downstream barrier as one of the designed improvements we have developed the following items to meet the City's needs and reduce the potential for downstream flooding: - Inlet Structure Modifications: Remove the existing trash rack and extend the inlet structure upstream approximately six feet and raise it one foot with a wider structure. A new trash rack (11- ~ feet wide and 5- ~ feet high) would be installed in the extended inlet structure to replace the existing trash rack (7 feet wide and 4- ~ feet tall). This would provide a 100 percent increase (doubling) in the trash rack surface area. In addition, the space vacated by the existing trash rack (7 feet wide and 4-~ long) would be covered by a horizontal grating (trash rack) and used as an area to drain removed debris. This horizontal trash rack would also serve as a second downstream inlet in the event the primary trash rack is blocked with debris. This modification includes installing riprap within the first six feet upstream of the extended structure and relocation of the guard railing around the downstream side of the structure that allows for access to clean the widened trash rack configuration, - AddinQ Additional Downstream Inlets: On the down stream side of Garrett Park there is an existing box structure that provides for the transition between the storm drainage piping that crosses the Hetch Hetchy Right-of-Way and the buried downstream 48-inch storm drainage piping. Remove the existing at-grade steel hatch that is 7-feet by 6-feet in area and replace the hatch with a trash rack similar to the racks at the inlet structure. The existing box is currently surrounded by handrail and is located behind the park landscaping so that this new inlet would not affect the park usage. Our proposed services include obtaining a survey of the site, preparation of design drawings for the inlet structure modifications and additional downstream inlet as identified above (four sheet anticipated), preparation of technical specifications for the improvements and construction support. Construction support would include submittal review, construction observation on an as requested basis, response to Contractor's Requests for Information and assistance with the preparation of change orders, if necessary. Attached with this letter is a breakdown of our estimated effort to provide these services. Since the exact scope of services cannot be clearly defined at this time, we propose that compensation for our services be on a time and expense reimbursement basis in accordance with our Schedule of Charges dated 1 January, 2003, attached. Payments shall be made monthly based on invoices which describe services and list actual costs and expenses. \ \pao \adm i n \busdev\2003\letterpropslb03089 _redwoodcity _9 arreltpark\revisedlet Ie rproposal.doc _. - -y ..-.-' , t·, ,-'^