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-4- b) A runoff study based on a storm of a ten year frequency tO show existing drainage from this site and twenty-five year frequency for proposed *facilities and method of draining thi~ site without exceeding the capacity of any street, on-site or off-site. * The facilities shall include an on-site retention basin and off-site storm drain construction subject to the approval of the City Engineer. c) Plans for an on-site retention system with sufficient volume capacity to hold the difference of run-off from the undeveloped site based on ten year frequency and the developed site based on twenty-five year frequency. d) Plans for an on-site storm drain in Sunflower Avenue and Raitt Street to include all appurtenances. NOTE: 'Size of the storm drain shall be determined by the Department of Public Works Design Section. Limits for the required storm system shall be east from Smalley Street in Sunflower Avenue and north in Raitt S~reet (proposed).from Sunflower Avenue to the low point (sump) in Ra~tt Street. e) Improvement plans for the private streets in conformance with Section 34-165 of the Santa Ana Municipal Code to include but not be limited to the following: 1) Vertically curbed streets spaced a minimum of 28 feet apart. Sewer, water and storm drain facilities. Any utilities within the public utility easement. 3. Dedicate on the final map a minimum 28 foot wide exclusive underground, non-exclusive surface easement over the private streets to the City of Santa Ana for public utility purposes plus additional easements as required by the Department of Public Works. The following requirements are to be complied with prior to release of bonds: a) Construct on-site retention basin and appurtenances per approved plan. b) Construct off-site City masterplan storm drain per approved plans. c) Construct private streets complete with utilities per approved plans.