SR 05:031 - Laserfiche WebLink

3.02 Impact on Existing Uses (On- and Off-Site): The 562-acre Lin property is currently vacant and is used for cattle grazing. Its eleva- tions range from 510 feet above mean sea level to 1,080 feet in the southeast comer. Low-density residential uses are located immediately to the north - the Vintage Hills and Grey Eagle Estates developments - and to the west - the Kottinger Ranch development - of the subject property, with medium-density residential neighborhoods located further north and west of these developments. Open space areas used for agriculture and grazing lie in the hills to the south and east, which are unincorporated areas and are located out- side of the City's Urban Growth Boundary Line. Based upon Figure 1-7, "Selected Site Constraints", of the "Kottinger Hills Project Final Environmental Impact Report" (FEIR), the proposal would introduce development in site areas identified as Blue Oak Woodland/Savanna, Drainage Channels, High Visual Sensi- tivity, Landslides, and Steep Slopes. The present grazing use of the subject property would be eliminated by the proposed project, while the amount of open space on the site would be reduced in area as noted earlier. The site has some intermittent streams, which would be potentially impacted by grading in conjunction with site development and then by the storm-water and irrigation-water runoff from the private lots. X May be Insignificant Insignificant Significant if Mitigated 3.03 Geologic Impacts (Hazards, Change in Topography, Erosion, etc.): As estimated by the applicant, approximately 700,000 cubic yards of earth material would be moved in conjunction with initial site grading. The site is located in an area of considerable topography with rolling foothills and steep slopes characteristic of southeast Pleasanton. The majority of the site's area exceeds a 10% slope grade, with an average slope grade varying from 20% to 25% or greater. Natural drainage swales and channels are located throughout the site, with a general water flow towards the northerly and east- erly directions of the property. The proposed project would result in substantial changes to the topography in the areas of the site proposed for streets and lots. Building pads would be proposed within areas of potential seismic shaking, expansive soils, landslides, erosion, liquefaction, and poorly consolidated to semi-consolidated deposits. Implementing the City's urban stormwater runoff measures for this development would likely include settlement ponds and detention basins to contain and then pretreat storm- water mnoffbefore entering the City's storm lines as well as any natural creek, swale, and gully intended to be used for runoff. The combination of slide repair, urban stormwater runoff measures, and the finished grading of individual lots may increase the amount of graded area. PUD-33, Initial Study Page 4 of] ] December 4, 2003