11 ATTACHMENTS 1- 6 - Laserfiche WebLink

a. To reduce NOx during construction, all excavators, dozers, scrapers, tractors, loaders, and backhoes used for project construction shall be equipped with Tier 3-rated engines. Alternatively, the number of pieces of diesel-powered equipment operating simultaneously could be limited in order to achieve the same level of NOx reduction. b. All contractors shall use equipment that meets the CARB's most recent certification standard for off-road heavy-duty diesel engines for a given model year engine. CULTURAL RESOURCES(SECTION 4.10) Significant Impact Impact 4.10-1: Construction activities proposed by the proposed project could disturb unknown subsurface cultural resources. Finding Changes or alterations have been required in, or incorporated into,the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential impacts to subsurface cultural resources to a less-than-significant level: Mitigation Measure 4.10-1: The following mitigation measures shall be required to reduce potential cultural resources impacts to a less-than-significant level: a. A program of archaeological monitoring should be undertaken for all construction related earthmoving activities in the vicinity of the ranch complex and within 100 feet of the drainage as it exits the compound and flows west out of the Lund Ranch project area. The duration of the monitoring program should be determined by the project archaeologist in conjunction with the project sponsor and the Pleasanton Planning Department. In the event of any discovery, work should be stopped within 50 feet of any discovery until a proposal for the evaluation of the resource as required by CEQA guidelines has been submitted to the lead agency for approval. If evaluation of the resource through a program of hand excavation demonstrates that the resource is eligible for inclusion on the California Register of Historic Resources, a proposal for mitigation of impacts to the resource should be submitted to the lead agency for approval before work is allowed to recommence in the area of recorded archaeological deposit. b. In the event that historic archaeological deposits are uncovered during site monitoring, work should be halted within 20 feet of any discovery until the deposit has been evaluated for potential significance through a program of hand excavation if necessary. If it is determined that the deposit qualifies for inclusion on the California Register, a plan for mitigation of impacts to the resource should be submitted to the lead agency for approval before any actual mitigation efforts are undertaken prior to the continuation of grading operations. Mitigation can include the recording in situ and/or removal of additional historical materials by an archaeological team for later analysis combined with continued monitoring of earthmoving activities in the vicinity of any discovery. LUND RANCH II(PUD-25)RESIDENTIAL.PROJECT l 7 FINDINGS