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EA POTENTIAL IMPACT: Project -generated traffic noise would result in a significant noise impact to nearby sensitive noise receptors. FINDING: Changes or alterations have been required in, or incorporated into, the project that avoid or substantially lessen the potential significant environmental effect. STATEMENT OF FACTS: A noise barrier would be constructed along the Lewelling Boulevard extension east of the railroad tracks to reduce this potential impact to less than significant. F. CULTURAL RESOURCES F.1 POTENTIAL IMPACT: The project would result in the disturbance of identified historic resources on or near the project site. FINDING: Changes or alterations have been required in, or incorporated into, the project that avoid or substantially lessen the potential significant environmental effect. STATEMENT OF FACTS: While the recorded and confirmed location of the historic site (CA-ALA-549H - Trojan Powder Works) within the project site would be disturbed during construction of Phase 3, the site does not meet either state or federal significance requirements or requirements for National Register listing due to the poor integrity of its physical remains. In addition, indirect impacts to the Roberts Landing historical area may result from increased human activity on the project site and adjacent areas (future regional trail use or visitation of open space habitat) and vandalism to historic resources by pothunters. However, the physical remains of the Roberts Landing area lack integrity, with no subsurface deposits evident to provide additional new information. Mitigation Measures 3.8.3 to 3.8.7 in the 1992 GDP EIR would mitigate this impact. These mitigations include the pre -construction delineation of archaeological sites and loci with non-destructive pin -flagging followed by archaeological monitoring of all project excavation activities. Any intact features should be recorded as part of this monitoring program. If intact subsurface features such as privies or trash dumps are uncovered, all work within 100 feet of the find should be halted until recommendations made by a qualified archaeologist have been carried out. In addition, mitigation proposed in the GDP EIR establishes a historical resources interpretive program about the Trojan Powder Works Company and Roberts Landing as part of the natural history restoration effort. The interpretive program will be in place at buildout of the project and will preserve the historical role of the Landing. F.2 POTENTIAL IMPACT: Previously undiscovered historic or archaeological resources could be disturbed and/or destroyed during construction or occupation of the project. 12