103-B. Director's Minor Modification DIR-2010-30 dated 9/23/10.pdfa a
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CITY OF CUPERTINO
10300 Torre Avenue, Cupertino, California 95014 (408) 777-3308
To: Mayor and City Council Members
Chairperson and Planning Commissioners
From: Aarti Shrivastava, Director of Community Developmen
Prepared by: Piu Ghosh
Date: September 23, 2010
Subject: Director's Minor Modification, DIR-2010-30, to allow paving in the front yard
of an existing duplex for the purpose of a parking space.
Chapter 19.132 of the Cupertino Municipal Code allows for administrative
approval of minor changes in a project. The Director reports his decision
to the City Council and Planning Commission in time to allow an appeal
of the decision within fourteen calendar days.
DISCUSSION
The project is located in a P(R2) - Planned Development Duplex zoning district.
According to Chapter 19.48 of the Municipal Code, any modifications to the project site
would require an approval from the Director of Community Development with a
Director's Minor Modification.
The applicant is proposing to resurface approximately 187 square feet of existing turf in
the front yard setback area with pervious stone pavers for parking purposes (see
Attachment 1 - Plan set).
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The Director of Community Development deems the modification minor and approves
the plan set (Pages 1-4) with the following conditions of approval:
1. PAVING MATERIALS
The paving materials for the proposed parking space shall be permeable pavers
on an aggregate base as shown on the plans.
This approval of the modification is effective September 23, 2010, The fourteen calendar
day appeal period will expire on October 7, 2010.
Enclosures:
Attachment 1: Plan Set
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1.
Excavate to the proper design depth (see diagram
at top right*). Remove all surplus unsuitable sub -base
material. Compact the area which has been cleared.
Then spread and compact the area with Class It 3/4"
minus aggregate for base material. The depth of the
base should be 3 to 12 inches, depending on anticipated
traffic, native soil conditions or as otherwise directed by
Site Engineer, Architect or Landscape Architect.
Compact base in lifts to 95% proctor density,
Installation Tip: Calstone recommends a minimum of
6 to 8 inches of compacted base in residential vehicular
conditions. 3 to 4 inches in pedestrian only areas.
2.
Spread concrete sand evenly over the base and
screed to a uniform depth of 1 to 1 1/2 inches up to t
he edge. (Edge restraints can be of various types, e.g,
PVC (Snap Edge/PaveEdge), concrete, wood, aluminum,
etc.). The screeded sand should not be pre -compacted.
3.
Install the Paving Stones hand tight in the desired
pattern 1/4 inches to 3/8 inches above final grade.
The joints between the units should be approximately
1/16 to 1/8 inches wide. Most pavers are made with
spacer bars to create a minimum joint width. These
spacer bars will provide the minimum joint necessary
for sand to enter.
4.
Cut the Paving Stones when required with a paver
splitter or saw to fit accurately and neatly.
Installation Tip: When saw cutting, be careful to not
allow cutting residue (wet or dry) to land on the pavers.
The residue will permanently dull the appearance of the
paving stones. This type of staining is extremely, if not
impossible to remove. Saw cut pavers should be rinsed
thoroughly before placing them into the laying field.
5.
Once an area is installed, compact the pavers 2-3
passes into the bedding sand with a plate vibrator.
This piece of equipment should be capable of 3000
to 5000 lbs. centrifugal compaction force, and operate
at a frequency of 80 to 90 hertz.
Concrete Pavers Sand Joint
Concrete
Plastic Edging
Metal Pin 1 Concrete Pavers
*Design Depth
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3-12"
O Base
Sand
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Base
Material
Soil Sub Base
Installation Tip: One of the most attractive features of
a Calstone paving stone is the elegant finish achieved
through the Duraface process. Care should be taken to
preserve this finish during installation. Most vibratory
plate manufacturers offer impact pads designed
specifically for paving stone installations. If this is
not available, the installer should use some other
form of intermediate media such as thin plywood,
carpet, cardboard, landscape fabric, etc.
This added protection is not necessary in our
River Rock and Quarry Stone product lines.
6.
Then sweep a dry sand over the, pavers and into
the joints. Make 4-5 passes with the plate vibrator
across the surface or until the joints are full of sand.
7.
Sweep off excess sand and wash down completed
project. The paver surface is now ready for use.
If using polymeric joint sand, read and follow
manufacturer's directions.