14 ATTACHMENT 6 - Appendix A - E

City of Pleasanton–Spotorno Ranch Reduced Development Project Environmental Checklist Initial Study/Consistency Checklist 104 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480021/Consistency Checklist/21480021 Spotorno Ranch Consistency Checklist ScreenCheck.docx • All grading and slope preparation activities shall be conducted under the supervision of a licensed Geotechnical Engineer or Certified Engineering Geologist. Timing: Prior to approval of a grading plan. MM H6 In graded construction areas, replacement vegetation shall be planted as quickly as possible. Graded areas that remain inactive for 10 days or more during the rainy season (October 1 to April 1) without permanent replanting should be hydroseeded or stabilized to inhibit dust. (Same as MM D3). Timing: During grading and construction. MM H7 The final geotechnical report for the grading plan for proposed projects within the Specific Plan Area shall be prepared by a professional engineer and approved by the City of Pleasanton. The report shall address the potential for delayed consolidation within deep fills and associated land surface subsidence. The report shall provide specific recommendations for: • Fill compaction specifications that consider the likelihood of eventual saturation and wetting and drying cycles for the fill materials; • Removal of colluvial material or weathered rock that may be subject to consolidation under the load of proposed fills; • Design and minimizes the variability of fill thickness within fills that underlie structures or other improvements at the project site; and • Design and operation of adequate subsurface drainage systems for fills (particularly beneath heavily irrigated areas or other water sources such as swimming pools or detention basins). Drainage systems for the fills shall be designed to minimize maintenance and ensure long-term performance. Flow from the drainage system shall be controlled so as not to cause or contribute to erosion of existing drainage channels. Timing: Prior to approval of grading plans. MM H8 On expansive soils, building foundations and improvements shall consist of drilled pier and grade beams, deepened footings (extending below expansive soils). Or post-tensioned slabs. Alternatively, expansive soil shall be removed and replaced with compacted non-expansive soil prior to foundation construction. The plan requires that subgrade soils for pavements consist of moisture-conditioned, lime- treated, or non-expansive soil, and that surface and subsurface water be directed away from foundation elements to minimize variations in soil moisture. Timing: Foundations and improvements to be specified in building plans prior to issuance of building permits.