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Director of Engineering/City Engineer and prior to City Council acceptance of public improvements. (Address this condition prior to issuance of an occupancy permit) 59. HIGH RISK UTILITIES: According to the Pipeline Information Management Mapping Application (PIMMA) available from the U.S. Department of Transportation (USDOT), a 'High Risk' utility exists along the Stanley Boulevard property frontage. The High Risk utility is purportedly a gas transmission pipeline operated by PG&E. Because Sheet C5 of the plans(Reference 1) shows a new domestic water service and fire service lateral extending from a water main in Stanley Boulevard, the High Risk utility must be shown on the plans together with an appropriate "CAUTION" note. Any excavation within proximity to the High Risk utility will require special oversight by PG&E. (Address this condition prior to permit issuance) Project Specific Condition. Stormwater and Provision C.3 of the National Pollutant Discharge Elimination System Permit 60. STORMWATER TREATMENT: The project creates and/or replaces 10,000 square feet or more of impervious surface (collectively over the entire project site) and shall comply with Section "C.3.b Regulated Projects" of the NPDES Permit No. CAS612008, and amendments, issued by the San Francisco Bay Regional Water Quality Control Board. The improvements plans shall include the Stormwater Management Plan prepared by a California licensed civil engineer, indicating the type and locations of stormwater treatment measures to be installed (numbered sequentially for identification purposes), and sizing calculations. The Stormwater Management Plan shall be subject to review and acceptance by the Director of Engineering/City Engineer, prior to the issuance of an engineering or building permit, whichever occurs first. (Address this condition prior to permit issuance) 61. C.3 COMPLIANCE: Referring to the C.3 Technical Guidance manual published by the Alameda Countywide Clean Water Program, Sections 2.2.4, 2.3.2, and 7.3 discuss Hydromodification Management (HM) measures. These measures must be implemented when: a. The project creates and/or replaces one acre or more of impervious surface, b. The project will increase impervious surface over pre-project conditions, and c. The project is located in a susceptible area. The project, as presented, fulfills requirements "a" and "c" because the impervious surface area is 112,377 or 2.6 acres (>1 acre) according to the calculations on Sheet C6, and because the project is located in a special consideration area that drains to a unimproved segment of Arroyo Del Valle. The applicant must disclose on Sheet C6 whether requirement"b" is fulfilled, thus mandating HM measures. If HM measures are mandated, Sheet C6 must show the required features. In addition, Section 2.3.2 of the manual discusses the "50 Percent Rule". It appears that the project is not subject to this rule if one assumes the replaced impervious area is 112,377 SF and the total site area (excluding Nevada Street) is 243,936 SF (46% < 50%). This calculation shall be explicitly shown on Sheet C6 as confirmation that the 50 Percent Rule is not triggered. If the above assumption is incorrect and the 50 Percent Rule is triggered, then a DMA must be created for the remaining site area such that the entire site receives stormwater treatment. (Address this condition prior to permit issuance) PROJECT SPECIFIC CONDITION 62. STORMWATER TREATMENT MEASURES INSPECTION AND MAINTENANCE AGREEMENT: The applicant shall enter into a "Stormwater Treatment Measures Inspection and Maintenance Page 10 of 16