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c. All visible mud or dirt track-out onto adjacent public roads shall be removed using wet power vacuum street sweepers at least once per day. The use of dry power sweeping is prohibited. d. All vehicle speeds on unpaved roads shall be limited to 15 mph. e. All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible. Building pads shall be laid as soon as possible after grading unless seeding or soil binders are used. f. Idling times shall be minimized either by shutting equipment off when not in use or reducing the maximum idling time to 5 minutes (as required by the California airborne toxics control measure Title 13, Section 2485 of California Code of Regulations [CCR]). Clear signage shall be provided for construction workers at all access points. g. All construction equipment shall be maintained and properly tuned in accordance with manufacturer's specifications. All equipment shall be checked by a certified mechanic and determined to be running in proper condition prior to operation. h. A publicly visible sign with the telephone number and person to contact at the Lead Agency regarding dust complaints shall be posted at the site. This person shall respond and take corrective action within 48 hours. The Air District's phone number shall also be visible to ensure compliance with applicable regulations. Mitigation Measure 4.8-2: To reduce the project's construction-related NOx emissions, the following provisions shall be included in the contractor specifications for the proposed project: 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 LUND RANCH II(PUD-25)RESIDENTIAL PROJECT 17 FINDINGS