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Ordinance No. 2290 Page 17 of 34 51. LEAD REMEDIATION: The applicant-submitted Phase 1 Environmental Site Assessment report by Ramboll US Consulting includes the following finding: “Results from soil sampling conducted by Ramboll in September and October 2020 identified concentrations of lead in shallow soil above regulatory screening criterion for residential land use…” This finding identifies a Recognized Environmental Concern. Elevated lead shall be remediated by the applicant according to governing regulations prior to any site disturbance, with evidence of said remediation submitted to the City of Pleasanton. (Address this condition prior to issuance of Building Permit for grading, demolition, or Building Construction, whichever occurs first). Project Specific Condition. 52. CORROSIVE SOILS: According to the Geotechnical Study by Geo-Logic Associates, collected soil samples have been classified as moderately corrosive. As such, all buried iron, steel, cast iron, ductile iron, galvanized steel and dielectric coated street or iron shall be properly protected against corrosion depending on the critical nature of the structure. Project Specific Condition. 53. CREEK SETBACK: Site improvements that abut or are within close proximity to the top of the creek bank at Arroyo del Valle are subject to Pleasanton Municipal Code §9.14.090(B)(3) “Watercourse Protection” which reads, “Prohibited Acts. No person shall commit or cause to be committed any of the following acts, unless a written permit has first been obtained from the operations services director: Carry out development within 20 feet of the top of a bank.” The Municipal Code allows City staff to consider designs that violate code standards if compelling technical information is presented by a recognized expert. For this application, the applicant submitted a site-specific Geotechnical Investigation report by Geo-Logic Associates that addresses creek bank stability and liquefaction. The following report recommendations must be incorporated into the site design: Stitch piers shall be installed along the top of the existing creek bank. Stitch piers shall consist of drilled, cast-in-place, reinforced concrete piers. Minimum pier diameter shall be 24 inches. Center-to-center spacing between piers shall be no more than two times the pier diameter. The upper portion of the stitch piers above the toe of creek bank elevation shall be designed to retain the soil and surcharge forces behind the piers. Resistance to vertical and lateral loads shall be from the lower portion of the piers below the toe of creek elevation. Project Specific Condition. 54. ACCESS TO CREEK: Lot D shall allow access to the creek for maintenance personnel. A locked gate shall be provided to prevent entry by unauthorized residents or the public. Project Specific Condition. 55. CREEK BANK MAINTENANCE: The applicant or future homeowners association shall maintain the creek bank within the boundary of Tract 8631 adjacent to the Arroyo del Valle in accordance with Zone 7 Water Agency standards. 56. SANITARY SEWER BACKUPS: The plumbing fixtures proposed within the basements will be subject to back-up if an obstruction occurs in the City’s mainline sewer within Saint John Street. The basements shall therefore be serviced by a Page 32 of 350