Laserfiche WebLink
(s,IA <br />Kennedy /Jenks Consultants <br />Jon Lynch <br />City of Redwood City <br />16 October 2003 <br />Page 2 <br />Based on your request not to include the downstream barrier as one of the designed <br />improvements we have developed the following items to meet the City's needs and reduce the <br />potential for downstream flooding: <br />- Inlet Structure Modifications: <br />Remove the existing trash rack and extend the inlet structure upstream <br />approximately six feet and raise it one foot with a wider structure. A new trash rack <br />(11 -' /2 feet wide and 5 -%2 feet high) would be installed in the extended inlet structure <br />to replace the existing trash rack (7 feet wide and 4 -%2 feet tall). This would provide a <br />100 percent increase (doubling) in the trash rack surface area. In addition, the space <br />vacated by the existing trash rack (7 feet wide and 4 —' /2 long) would be covered by a <br />horizontal grating (trash rack) and used as an area to drain removed debris. This <br />horizontal trash rack would also serve as a second downstream inlet in the event the <br />primary trash rack is blocked with debris. This modification includes installing riprap <br />within the first six feet upstream of the extended structure and relocation of the guard <br />railing around the downstream side of the structure that allows for access to clean <br />the widened trash rack configuration. <br />- Addinci Additional Downstream Inlets: <br />On the down stream side of Garrett Park there is an existing box structure that <br />provides for the transition between the storm drainage piping that crosses the Hetch <br />Hetchy Right -of -Way and the buried downstream 48 -inch storm drainage piping. <br />Remove the existing at -grade steel hatch that is 7 -feet by 6 -feet in area and replace <br />the hatch with a trash rack similar to the racks at the inlet structure. The existing box <br />is currently surrounded by handrail and is located behind the park landscaping so <br />that this new inlet would not affect the park usage. <br />Our proposed services include obtaining a survey of the site, preparation of design drawings for <br />the inlet structure modifications and additional downstream inlet as identified above (four sheet <br />anticipated), preparation of technical specifications for the improvements and construction <br />support. Construction support would include submittal review, construction observation on an <br />as requested basis, response to Contractor's Requests for Information and assistance with the <br />preparation of change orders, if necessary. Attached with this letter is a breakdown of our <br />estimated effort to provide these services. <br />Since the exact scope of services cannot be clearly defined at this time, we propose that <br />compensation for our services be on a time and expense reimbursement basis in accordance <br />with our Schedule of Charges dated 1 January, 2003, attached. Payments shall be made <br />monthly based on invoices which describe services and list actual costs and expenses. <br />',�omo aominWusdevQDC3seeerpropstO30B9 reowoodaly_ garreapsrk4evr- oleeerproposal.doo <br />