02/20/64 - Laserfiche WebLink

5. S~ecificationa and Standard Details - In accordance with Section 8.01 of Ordinance No. 3Su, it ie requaated that the City Engineer be authorized to modify the City's existing Standard Specifications and Details in applying them to this subdivision in order to allow for modern materials, methods and design criteria as may be required. Some specific recommend- ations for each modificatioua are ae follows: a. Specifications for sewer and water pipe should be modified to allow newer type joints. b. Specifications for street name signs should be modified to require white reflectorized letters, block numbers and arrows on green coated aluminum sheeting as previously approved by the Planning Commission and City Council. c. Reference should be made to the 1960 Standard Specifications of the State Division of Highways, rather than the 1954 edition, particularly with reference to roadway materials. 6. Storm Drainage Syatem - The following recommendations are made after reviewing the detailed recommendations from the Alameda County Flood Control and Water Gonaervation District. It is recoaaoended that the area southeast of the green line as shown on Exhibit "A" of City Engineer's report to Planning Com- mieaion should not be developed until the Arroyo del Valle Dam 1s functional unless this Brea is drained to the northcrest in its natural drainage basin, that all valley gut.~era be eliminat~r_,tvn'ras apccifi.rally allowed by the City Engineer, that. naxi:^:.ua :pacing an starat eater inlets be limited to 1000 feet, that the developer prav~.3e and lnrta7.1 an autoxatiC gate and erosion control apron at the outfall cs: of the 3~:i" R.C.P., that the developer clear the channel bottr~n of the Arroyo del Valle from soave Eopyard Road to the Arroyo de la Laguna and of the Pleasanton Canal from the holding area to the Arroyo de la Laguna, to the satisfar_ties ot.' the City Engineer and the Alameda County Flood Control and Wags C.~nservsticn District, that a 2 feet high, 6 feet wide berm be constructed alc,~e t:.e red li.n~ shown on Exhibit "A" or lot grading effected such that flording will t~ contained generally west of said red line, that a 2 feet high, 6 feet wide berm be constructed along the downstream channel and holding area ae shown on Exhibit "A" of City Engineer's report to Planning Commission, that the downstream channel be constructed with a 3 feet wide bottom rather than 2 feet wide, and that the developer provide a master plan for storm drains orith drainage calculations for the entire tract and tributary area as required by Ordinance 358. Final approval of the storm drain system should be withheld until Chia information has been received and approved by the City Engineer. In addition to the above, occupancy of buildings on lots 1-3, 9-14, 20-25, 31-35, 371 and 373 will not be allowed until after the Arroyo del Valle Dam is functional. The developer is hereby notified that this area may be subject to floods until the dam is constructed and the City shall not be held liable for damage to any structures built on these lots or on any other lots. 2.