Attachment 05TOWN OF LOS GATOS
PARKS AND PUBLIC WORKS
PROJECT INFORMATION SHEET
Engineering Division
December 19. 2017
ITEM: 26 Alpine Avenue; APN: APN 529-37--042
Planned Development Application PD-15-001
Requesting approval to construct a new single-family residence and remove a large
protected tree on vacant property zoned R-1:20.
PROPERlY OWNER: Toby & Susan Corey
APPLICANT: Tom Sloan AIA
Q: What is the average slope of the property and how is that determined?
A: The average slope of the existing property Is 41%. This figure is determined by a formula
which uses the total area of the property, the contour interval, and the combined lengths of
the property's contours.
Q: What Is the average slope of the area proposed for development?
A: The average slope of the area proposed for development is 55%.
Q: How much grading Is proposed for the project?
A: The proposed house has been stepped back into the hillside in an effort to reduce massing.
As such there will be significant off-haul of soil. According to the applicant's civil engineer
the project proposes 1,352 cubic yards of cut and 21 cubic yards of fill .
Q: How does the grading compare to the previous project proposed for this property?
A: The previously proposed project, Architecture and Site Application 5-04-064, had estimated
earthwork volumes of 1,474 cubic yards of cut (122 additional cubic yards) and 140 cubic
yards of fill (+119 CY).
Q: What is tf:-e status of the watercourse that runs along the western property line?
A: The intermittent stream that runs along the western property line is a tributary to Los Gatos
Creek and is recognized by the Santa Clara Valley Water District (SCVWD). The stream has
bare soil banks and a cobble substrate.
Q: What Is the required setback from the stream?
A: The required slope stability protection area as defined by the Santa Clara Valley Water
Resources Protection Collaborative's Guidelines & Standards for Land Use Near Streams is
20-feet from top of bank for a single-family home near a stream with little to no hardening
with an additional 5-feet added for lots greater than 10,000 square feet.
Parks and Public Works Department • Engineering Division • 41 Miles Ave, Los Gatos, CA 95030
408.399.5771 • www.losgatosca.gov • www.facebook.com/losgatosca
ATTACHMENT 5
TOWN OF LOS GATOS
PARKS AND PUBLIC WORKS
Q: What Best Management Practices (BMPs) will be implemented to mitigate potential
pollution to the stream during construction.
A: The Erosion Control Plan calls for a stabilized entrance, concrete washout, spill kit, and
wattle (fiber roll) around the areas of disturbance, with multiple rows along the slope
between the proposed improvements and the stream.
Q: What potential geotechnlcal hazards are associated with the property?
A: According to the Fault Lineament & Coseismic Deformation Map for the Town of Los Gatos
General Plan Update, the eastern edge of the property is located in an area of coseismlc
ground deformation. Additionally, per the Geologic Map for the Town of Los Gatos General
Plan update, there is a trace fault that traverses approximately through the southern edge
of the property. Because of these concerns, a Geotechnical and Geologic Analysis was
performed by the applicant's geotechnical engineer. This report was peer reviewed by the
Town's geotechnical and geological peer review consultant.
Q: What is the appropriate setback width from the trace fault?
A: The applicant's geotechnical consultant, Pollak Engineering Inc, agreed with the prior
applicant's geotechnical consultant, Hallenbeck/Allwest Associates, that a setback of 50-
feet is needed from the approximate location of the trace fault. The proposed building
layout meets this requirement.
Q: Did the Town's Geotechnical and Geological Peer Review Consultant agree with the
analysis of the Applicant's Geotechnical Engineer?
A: Yes -The Town's peer review consultant agreed with the applicant's geotechnical
consultant that the proposed project is feasible from a geotechnl cal engineering standpoint,
provided the recommendations provided in the report are incorporated in the plans and
implemented during construction. The Town geotechnical consultant noted there was not
enough information provided to determine that the proposed construction would improve
site stability, as asserted by the applicant's geotechnical engineer in their report.
Parks and Public Works Department • Engineering Division • 41 Miles Ave, Los Gatos, CA 95030
408.399.5771 • www.losgatosca.gov • www.facebook.com/losgatosca