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7.B. - Page 109 Redwood City Chapter 4.Environmental Impact Analysis Hazards and Hazardous Materials Impact Discussion The regulatory environment and existing conditions remain the same as described in the 2007 FEIR except for the 2010 City of Redwood City new General Plan.The new General Plan includes several goals and policies related to utilities which have been added or changed since the 2007 FEIR. As discussed below,with implementation of the standard conditions identified in the 2007 FEIR,the proposed modifications to the project would not result in any new or more severe significant hazards or hazardous materials impacts beyond those previously addressed in the 2007 FEIR and 2007 Addendum No. 1,and there are no other changes in circumstances,or new information that would necessitate any major modification of the hazards and hazardous materials discussions in the 2007 FEIR and 2007 Addendum No. 1. Would the project: a. Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials? Less-than-Significant New Impact.As described in the 2007 FEIR(page 4.11-4),the fueling center would be designed in accordance with local,state,and federal requirements and would be installed by State Certified Installation Contractors.The fueling center would include an additional eight fueling stations and associated piping to connect the stations to the existing USTs.Underground piping would consist of double-wall flexible (high density polyethylene [HDPE]) piping.The piping material is resistant to corrosion and is flexible.The design of the piping connectors prevents rupture from any form of movement caused by the settling of backfill material.A pressure line leak detector(PLLD) is currently installed within the existing fuel system.Costco uses a PLLD system that is set to a more sensitive standard than required by federal or California code for double-walled piping.The PLLD is set to 0.1-gallon per hour sensitivity versus the required three gallons per hour. The use of visual and audible alarms prevents UST overfill. Standard Condition 4.11-3 (Standard Condition 4.11-3 in the 2007 FEIR [page 4.11-5]) requires the installation of the fueling center systems to be in compliance with certain federal standards. Compliance with applicable installation standards would prevent significant impacts regarding the routine transport,use,or disposal of hazardous materials.Therefore,new impacts would be less than significant. Standard Condition 4.11-3 (2007FEIR Standard Condition 4.11-3):All USTs and associated piping shall be properly installed in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory.Tank and piping system installation practices and procedures described in the following codes may be used to comply with the requirements of the following sections:American Petroleum Institute Publication 1615, "Installation of Underground Petroleum Storage System;"or Petroleum Equipment Institute Publication RP 100,"Recommended Practices for Installation of Underground Liquid Storage Systems;"or American National Standards Institute Standard B31.3,"Petroleum Refinery Piping,"and American National Standards Institute Standard B31.4,"Liquid Petroleum Transportation Piping System." In addition,settlement monitoring is recommended prior to construction. Addendum No.2 to the Environmental Impact Report for 4-64 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12