HomeMy WebLinkAboutMarch 14OSC FINAL_Minutes_19-0314.docx 1/7/19 1
Los Altos Hills Open Space Committee
Los Altos Hills Parks and Recreation Building
FINAL Minutes of Regular Meeting March 14, 2019
Members and Associates Present: Peter Brown, Richard Contreras, Kit Gordon, Jean Struthers, Wendie Ward,
Sue Welch (Members); Kjell Karlsson, (Associate)
Members and Associates Absent: George Clifford, Nancy Couperus (Members); Karen Lemes, Alice Sakamoto,
Sharen Schoendorf (Associates)
Council Liaison Present: George Tyson
1. Call to Order and Approval of Minutes
A. Roll Call. KG called the meeting to order at 9:05 am.
B. Acceptance of Meeting Minutes. None to approve.
C. Announcements.
i. Wildfire Preparedness Community Meeting. Tuesday April 23, 2019 6:30 pm at LAH Town Hall.
ii. Presentation to Council from EDPC. At the Council Meeting on Mar 21, 2019, PB will present a
proposal from EDPC to restore the Town Hall native plant garden. OSC will support this effort.
2. Planning
A. Planning Site reviews.
i. 10842 West Loyola Road. (KG, RC; Lands of Ho; APN 331-21-002; #117-16-ZP-SD-CDP). KG
presented information and draft recommendations. OSC was asked to review plans for this site in
2016, but did not have access to the property and was later told the project was on hold. The recently
revised plans were not sent to OSC for review, so OSC comments could not be provided to the
Planning Commission prior to their Mar 6, 2019 hearing on the project.
Reason for OSC review is a new residence. This 1-acre vacant lot (LUF = 0.5) is on the east side
of West Loyola and is steep and heavily wooded, with most areas 35– 38% slope and some areas
>50% slope. The entire lot meets criteria for an open space easement. The lot slopes down to a
tributary of West Loyola Creek that runs just outside the Town border; the creek banks are within 20
feet of the western corner of the parcel. Several mature blue oaks are growing on the property,
including one 24” DBH proposed for removal and five that will be impacted by the proposed building.
Other constraints include an old landslide and a fault line. Following lengthy OSC discussion of the
plans, lot constraints, and criteria for OSEs, RC moved that the OSC make the following
recommendations, including an open space easement as shown on the plans (Attachment A):
1. Reduce the building area on this highly constrained lot. The entire lot meets criteria for an
open space easement.
2. Move the building site out of the canopy of the cluster of blue oaks to limit the number of oaks
impacted. Oak preservation will stabilize the hillside.
3. Create an open space easement in areas west and south of the building site as per the Town’s
Land Use Policy 2.5. Starting approximately 80 feet from the NW corner and dropping down
to the 356 ft elevation line and continuing to the eastern border to connect to the OSE on the
adjacent property. See diagram in OSC property review.
4. Grading on the hillside should be limited to protect hillside habitat and stability.
5. Reduce invasive weeds: milk thistle, oxalis, Italian thistle.
JS seconded and the vote was unanimously in favor (PB, RC, KG, JS, WW, SW). KG will send
the OSC property review (Attachment A) to the Planning Department.
ii. 27350 Julietta Lane (RC, KG; Lands of Krappe; APN 182-23-102; SD19-0014). RC presented
information and draft recommendations. Reason for OSC review is a new basement under the existing
house and extensive new landscaping. The 1.45-acre lot, located on the east side of Julietta Lane, has
steep areas, including an area behind the house above the existing retaining wall that has slope >30%.
A 10-ft wide pathway easement runs along the southern border (no path has been built). A number of
large oaks are on the property, some not shown on the development plans. The lot is fenced and
extensively landscaped. Adjacent lots apparently do not have OSEs. After discussion, RC moved
that OSC recommended no open space easement is required, but efforts should be made to
protect the existing oaks during construction. KG will send the OSC property review to the
OSC FINAL_Minutes_19-0314.docx 1/7/19 2
Planning Department. SW seconded and the vote was 5 in favor (PB, RC, KG, WW, SW), 1
opposed (JS; recommended OSE).
iii. 27355 Sherlock Road (Lands of Lilot; APN 182-30-040;VAR19-0004). KG presented information
and draft recommendations. OSC reviewed this property in 2007 with a recommendation to dedicate a
U-shaped OSE over the steep slopes behind the house. (The 2007 development project was not done
and the OSC report could not be found.) Reason for OSC review is remodel of approximately half the
existing house built in the 1920s. This 1.1-acre lot (LUF = 0.54) on the north side of Sherlock Road is
heavily wooded and steeply sloped, with most areas with 30– 50% slope, and some areas with >100%
slope. Most of the lot area below the 700-foot elevation contour meets criteria for an OSE based on
slope and presence of a creek and mature oaks. A natural drainage swale with no apparent bank runs
diagonally across the property and drains into Adobe Creek. The developer recently planted fruit trees
on the 35% slope behind and below the house and has installed nylon fencing around the fruit tree area
that is higher than the 6 feet allowed by LAH fence ordinances. The developer reported to the OSC
that the fencing is temporary and he plans to remove it. In addition, 8-ft high fencing not in
conformance with LAH fence ordinance has been installed near the house. OSC discussed the value of
an OSE on this steep parcel and whether to require removal of the existing fencing at the time the OSE
is dedicated. Fencing is not allowed in OSEs and the developer has stated the fence is temporary.
Following committee discussion, RC moved that OSC recommend:
1. Dedication of an open space easement approximately below the 685-ft elevation line as per the
town’s Land Use Policy 2.5. See diagram in Appendix C.
2. Allow existing nylon fencing around the orchard to remain temporarily within the open space
easement. Fence is to be removed in the future to meet open space easements requirements.
3. Allow the existing barn within the open space easement. Paths are allowed in OSEs.
4. Reduce invasive weeds: French broom, Spanish broom, oxalis, Italian thistle.
PB seconded and the vote was unanimously in favor (PB, RC, KG, JS, WW, SW).
C. Fence Permit reviews. None.
3. New Business
A. Evaluation of Grassroots Ecology work in Los Altos Hills. The LAH budget for fiscal year 2019-2020
will be set in the next few months. Public works Director Nichol Bowersox requested OSC write a letter
evaluating the Grassroots Ecology’s stewardship and community education work in Town-owned open
space lands to assist Public Works in their review for the Grassroots Ecology contract renewal. SW
distributed 1) a summary of funding to Grassroots from the Town and SCVWD grants from 2016 to 2018;
and 2) a draft OSC letter in support of Grassroots and recommending renewing the contract to allow them
to continue their work in LAH (Attachment D).
Funding for Grassroots work in LAH open space preserves was $102K, $104K, and $129K for
FY 2016, 2017, and 2018, respectively, with SCVWD grants providing about 50% of these funds. The 3rd
and final year of grant funds ($45.5K per year) for restoring Moody Creek ends July 31, 2019. Grassroots
was awarded a second grant—a pollution prevention grant started in July 2018 to restore a badly degraded
area on the lower Westwind Community Barn property and improve water quality in Moody Creek by
slowing and filtering storm-water run-off from the horse facilities. OSC discussed at length the level of
Town funding to recommend for the next fiscal year. The consensus was for a three-year contract to
support Grassroots at a level that would allow them to 1) maintain the progress made in the past five years
in the preserves and 2) to accommodate the additional work load required for the pollution prevention
grant work on Westwind Barn property. OSC suggested a minimum of $80K per year, continuing for
three years, and, if Town finances allow, an additional $5 to 10K per year. SW moved that OSC send
the letter of support to Public Works Department recommending continued funding for Grassroots
Ecology at a level that will allow them to maintain the progress made in the preserves in the past
five years and the new work for the pollution prevention grant. OSC strongly recommends a 3-year
contract from July 2019 through June 2022 (allocating at minimum $80,000 per year or $245,000
over 3 years). SW will obtain information from Grassroots regarding the level of services they can
provide and recommend funding up to $90K per year if Town finances allow and Council agrees.
WW seconded and the vote was 5 in favor (PB, RC, JS, WW, SW) and 1 abstaining (KG).
4. Continuing Business
OSC FINAL_Minutes_19-0314.docx 1/7/19 3
A. OSC Observations on Green Stormwater Infrastructure (GSI). In February KG visited a number of sites in
Town that have had excessive run-off or flooding in the past and identified locations where green
infrastructure projects could be installed to reduce flooding and pollution and increase groundwater
recharge. KG distributed a summary of OSC recommendations from this survey (Attachment E). One of
the largest sources of pollution in Town is run-off from I-280; a number of asphalt channels from I-280
dump roadway contaminants and trash directly into local creeks. Stormwater also traverses LAH
roadways in many locations, carrying contaminants into creeks. Dissipators at the base of the channels
from I-280, and curb-cuts, swale modifications, and other GSI systems could reduce this pollution. Other
opportunities to improve water quality include horse manure management, private pond maintenance, and
fertilizer usage in vineyards and orchards near creeks.
Sites OSC identified for potential GSI projects to for reduce pollution from roadways include:
Altamont Road near Byrne Preserve (roadway flows directed into Byrne); Page Mill Road at Moon Lane
(run-off into Matadero Creek; roadway ice); Robleda Road at Duval Lane; Burke at Chapin (new
continuous curb needs cuts); Foothill College (trash cigarette butts to Adobe Creek); Fremont Hills
Country Club (tennis balls and food containers in Deer Creek). OSC also recommends the Town organize
opportunities for youth and other volunteers to clean up local creeks and roadsides. Following committee
discussion, PB moved that OSC approve the Green Infrastructure Observations memo with the
suggested edits and send it to Public Works. JS seconded and the vote was unanimously in favor
(PB, RC, KG, JS, WW, SW).
B. Stinkwort management on Caltrans and Stanford property. OSC discussed the continuing problem of
uncontrolled stinkwort infestations on nearby Stanford lands and on Caltrans land along I-280 and at
interchanges in LAH. OSC will send a memo to City Manager Carl Cahill to request he send letters to
Stanford and Caltrans asking them to act to control this highly invasive weed. It was suggested the letter
include CA State laws regarding control of noxious weeds.
C. Updates for City Council and Planning Commission meetings, Site Development meetings, Committee
meetings. None.
D. Review Future Topics for 2019 OSC planning. Deferred to April meeting.
E. Sign-ups for FastTrack/Site Development meetings. Meetings are held most Tuesdays 10 to 11 am.
5. Open Discussion and Communications from the Floor. None
6. Adjournment. Meeting was adjourned at 11:03 am.
Next Regular Meeting: Thursday, April 11, 2019
9:00 AM at LAH Parks and Recreation Building
Attachment A: OSC review for 10842 West Loyola Road
Attachment B: OSC review for 27350 Julietta Lane
Attachment C: OSC review for 27355 Sherlock Road
Attachment D: Grassroots Ecology Funding Summary and OSC Letter of Support
Attachment E: OSC Observations for Green Infrastructure Projects
Final minutes were approved without amendments at the Regular Open Space Committee meeting of April 11,
2018.
10842 West Loyola Drive 4/11/19 1
To: Los Altos Hills Planning Department
From: Open Space Committee
Date: March 14, 2019
Property address: 10842 West Loyola
Date of Site Visit: March 6, 2019
Lands of Ho APN 331-21-002
Town
Planner
Steve Padovan Project
Number
#117-16-ZP-SD-CDP
Lot Slope LUF MDA (sqft) MFA (sqft)
1 acre 35.8% 0.447 6428 4468
Reason for review
New Residence
BACKGROUND
It is unfortunate that our committee comments will be received after the March 7, 2019 Planning
Commission hearing therefore unable to provide the Commission with a complete information
packet during the hearing. In June 2016 the Open Space Committee was asked to review 10842
West Loyola but a locked gate prevented access.
Excerpt of minutes regarding this property from July 2016 OSC minutes.
PROPERTY SUMMARY
The site is a steep, wooded, undeveloped lot located on West Loyola, sloping down with from
West Loyola toward a tributary of Loyola Creek. The slope for most of the property is in excess of
30% with sections in excess of 50%. The entire lot meets conditions for open space easement.
The property line along the south follows the edge of the flood plain but does not border the
stream. The western corner of the property is within 20 feet of the stream. Several mature Blue
Oaks exist on the property. Geologist reports note (will be reviewed prior to March 14)
A cluster of five mature blue oak trees near the proposed building will be impacted. A retaining
wall and walkway will be placed over the roots of 2 heritage blue oaks, approximately 10 feet
from the trunks. One 24” DBH blue oak is proposed for removal.
(Note: I still need to read geology report and research adjacent easements)
OSC DRAFT RECOMMENDATION
1. Reduce the building area on this highly constrained lot. The entire lot meets criteria for an
open space easement.
10842 West Loyola Drive 4/11/19 2
2. Move the building site out of the canopy of the cluster of blue oaks to limit the number of
oaks impacted. Oak preservation will stabilize this hillside.
3. Create an open space easement in areas west and south of the building site as per the
Town’s Land Use Policy 2.5. Starting approximately 80 feet from the NW corner and
dropping down to the 356 elevation line and continuing to the eastern border to connect
with OSE on adjacent property. See diagram.
4. Grading on the hillside should be limited to protect hillside habitat and stability.
5. Reduce invasive weeds: milk thistle, oxalis, Italian thistle
Date of OSC review: March 14, 2019
Voting of review:
Proposed Open Space Easement area.
10842 West Loyola Drive 4/11/19 3
Diagram showing parcel in relation to barn, floodplain and stream.
10842 West Loyola Drive 4/11/19 4
Red lines are approximate border of parcel. Blue lines are tributaries of Loyola Creek. The
cluster of blue oaks is visible.
10842 West Loyola Drive 4/11/19 5
Building site is within canopy of cluster of blue oaks on slope of approximately 20%.
10842 West Loyola Drive 4/11/19 6
Floodplain, stream (adjacent to redwood) and barn below property line. Property line
approximately at transition from slope to plain.
10842 West Loyola Drive 4/11/19 7
Looking toward east, below property line in floodplain.
10842 West Loyola Drive 4/11/19 8
Animal trails noted.
10842 West Loyola Drive 4/11/19 9
Mature 35” DHB blue oak near southern border of property.
10842 West Loyola Drive 4/11/19 10
Several invasive weeds including milk thistle (pictured), oxalis and Italian thistle.
10842 West Loyola Drive 4/11/19 11
SUPPORTING INFORMATION
SLOPE AND SOIL
Average slope of lot _35.8%
Areas with slope ≥30%? Yes
Check slope/LUF worksheet on subdivisions na
If applicable, Review Geologic Hazard Report,
(For more information see Slope and Soil in Appendix)
CREEKS
Creeks or waterways or swale on parcel? nearby
Name of creek/tributary of: Loyola Creek (Hale Watershed)
Shown on USGS map? SCVWD creek map? LAH Hazard Map? EcoAtlas? X
Condition of banks? seasonal drainage, confirmed by photos
Existing riparian or OSE or SCVWD easement along creek on this property or nearby parcels?
Yes on 10850 West Loyola
Does SCVWD want to expand their easement?
Proposed setbacks for structures? 25 feet
Evidence of bed, banks, or Original High Water Mark (OHWM)? Yes but not on property
Identify any structures including fences within 25 feet of top of bank?
Within OHWM?
For more information see Creeks in Appendix.
TREES, NATIVE VEGETATION & INVASIVE PLANTS
Heritage oaks? Yes, blue oaks
Significant trees? Groves of significant trees? Yes
Trees proposed for removal (number and species)? 1 24” DHB blue oak to be removed and 4
impacted by development
Significant native vegetation? Yes, blue oaks, toyon
Significant invasive pest plant vegetation? Yes, milk thistle, oxalis, Italian thistle
For more information see Trees, Native Vegetation & Invasive Plants in Appendix.
WILDLIFE CORRIDORS & FENCING
Check 2006 Live Oak Associates map (not official)
Evidence of wildlife (e.g., deer trails, spoor)? Yes, wildlife trails noted
Identify location and type of existing fencing: chain link fence on northern and western
borders
Check that fencing on plans agrees with fencing on the ground
Note any fence that does not meet current fencing regulations
(For more information see Wildlife Corridors and Fencing in Appendix)
10842 West Loyola Drive 4/11/19 12
OPEN SPACE EASEMENTS (OSE)/CONSERVATION EASEMENTS (CE)
Check Town records for existing CE or OSE on this property and adjacent and nearby parcels.
OSE on 10850 West Loyola (west of property) at approximately 340 elevation. Request
staff to review other parcels.
Identify on plans and attach copy (photo) of areas where OSE are recommended (slope ≥30%,
significant trees, wildlife corridor, creeks, drainage swales)
(For more information see Open Space/Conservation Easements, in Appendix)
PATHWAY EASEMENTS (PE)
Check Town records for existing or newly proposed PE on this property or adjacent and nearby
parcels. None
FOLLOW-UP
Send final copy to OSC Chair & Secretary
Upload to TraKit ?
Add address to list of easements to track on OSC agenda
10842 West Loyola Drive 4/11/19 13
Appendix
Slope and soil
Check for colluvial soil, earthquake faults, springs, seeps, shallow groundwater.
Safety Policy 1.1 Open space easements, zoning and other land use regulations shall be
used to limit and, in some cases, prohibit development in areas of unstable terrain, active
fault traces, water channels, flood plains, excessively steep slopes and other areas
determined to be hazardous to public welfare and safety.
Safety Policy 2.2 Locate development so as to avoid geologic hazards, including slope
instability, to the maximum extent feasible.
Land Use Policy 2.5 Steep slopes, canyons and ravines generally in excess of 30%
slope, as well as natural swales and drainage channels, and geologic hazard areas within
areas designated for residential development shall be left undisturbed and preserved in
their natural condition to the maximum extent feasible.
Land Use Policy 2.6 Limits on the development of individual residential lots shall be
determined based on evaluation of such factors as natural vegetation, topographic
characteristics, soils and geology.
Creeks
Area within the OHWM are regulated as Waters of the United States and protected by the Clean
Water Act. Any development, vegetation removal, or stream bank modifications within this area
may require permits from regulatory agencies: US Army Corps of Engineers, CA Dept of Fish and
Wildlife, Regional Water Quality Control Board.
Source: US Army Corps of Engineers
Safety Policy 3.1: Leave natural channels and flood plains in a natural state,
unencumbered by development to the maximum extent feasible.
10842 West Loyola Drive 4/11/19 14
Conservation Policy 5.1: Keep or restore major drainage courses in their natural
condition insofar as possible because of their importance in supplying major vegetation,
land forms and wildlife habitat, and storm drainage.
Conservation Policy 1.3: Preserve the integrity of riparian corridors as unique and
environmentally sensitive resources.
Conservation Policy 3.1: Maintain and protect creeks and riparian corridors for
wildlife that use this resource for food, shelter, migration and breeding.
Conservation Policy 11.5: Ensure that development projects are designed to conserve
the natural slope, preserve existing native vegetation, limit invasive species, and conserve
natural drainage channels and swales.
Municipal Code 10-2.702 Siting.
(e) Creek Protection. Structures shall be set back a minimum of twenty-five (25) feet
from the top of bank of all creeks. Greater setbacks may be required along major creeks in
the Town; however, lesser setbacks may be allowed where approved by the Planning
Commission. Improvements required to all creeks shall be accomplished to appear natural
and to maintain the natural meandering course of the existing creek. Creeks and banks
shall be protected so as to remain in their natural state as much as possible. They should
not be disturbed by the building or grading process. No grading shall be allowed in creeks
or within the required setbacks from top of bank. Siting of structures shall be done with
safety as a primary concern. Safety concerns and preservation of riparian habitat are
required to be simultaneously addressed when designing development and required
improvements to creeks. (§ 15, Ord. 299, eff. December 11, 1985; §§ 6, 7, Ord. 370, eff. May
20, 1994; § 1, Ord. 504, eff. October 28, 2006)
Trees, Native Vegetation and Invasive Plants
Note in main body of form - major infestation of invasive weeds such as stinkwort, oxalis, Italian
thistle, purple starthistle, yellow starthistle, pampas grass, broom, teasel, giant reed (Arundo
donax), poison hemlock, etc.
Conservation Policy 2.2: Minimize disturbance of the natural terrain and vegetation.
Preserve and protect native and naturalized plants, with special attention to preservation
of unique, rare or endangered species and plant communities such as oak woodlands.
Conservation Policy 2.3: Preserve and protect Heritage Trees, including native oaks and
other significant trees, on public and private property.
Conservation Policy 11.5: Ensure that development projects are designed to conserve
the natural slope, preserve existing native vegetation, limit invasive species, and
conserve natural drainage channels and swales.
Conservation Program 2.5 Encourage the dedication of conservation/open space
easements or the public acquisition of areas that are rich in wildlife or of a fragile
ecological nature to ensure their protection
Open Space Policy 1.2: Protect and maintain those areas necessary to the integrity of
natural resources and processes, with special emphasis on, but not limited to, the
groundwater recharge and drainage system, open spaces vital for wildlife habitat,
open spaces suitable for agriculture, and other areas of major or unique ecological
significance.
Land Use Program 2.3 Encourage the preservation of existing trees, rock outcroppings,
ridgelines and other significant natural features
10842 West Loyola Drive 4/11/19 15
Municipal Code 10-2.702 Siting.
(f) Tree Preservation. Every feasible attempt should be made to preserve existing trees
except those trees identified in the Los Altos Hills Landscape Guidelines invasive plant
CA FOOD AND AGRICULTURAL CODE - FAC
DIVISION 4. PLANT QUARANTINE AND PEST CONTROL [5001 - 8808]
5401.
Any premises, plants, conveyances or things which are infected or infested with any pest,
or premises where any pest is found, are a public nuisance, and shall be prosecuted as
such in all actions and proceedings. All remedies which are given by law for the prevention
and abatement of a nuisance apply to such a public nuisance.
Wildlife Corridors and Fencing
Conservation Policy 2.7: Avoid the development of environmentally sensitive areas that
are rich in wildlife or of a fragile ecological nature, such as areas of rare or endangered
species of plants, or riparian areas.
Conservation Goal 3: Maintain and enhance the integrity of wildlife habitat.
Conservation Program 3.3: Assess the potential for development patterns to fragment
and isolate significant wildlife habitats.
Conservation Section 315: Planning for natural movement of wildlife can help avoid,
minimize and compensate for serious negative impacts on wildlife and humans. Areas
that link wildlife habitat have become vital because native animals such as deer, fox,
bobcat, and coyote are prevented by roads, fences, homes and other development from
moving freely as they once did.
Municipal Code 10-1.507 (d) Prohibited Fences, Walls, Gates, and Column Types. The
following fences are prohibited:
(1) Chain-link or cyclone fences, including any fence with bare lengths of wire stretched
between metal poles, with the exception of dark green, black, or brown vinyl-coated chain-
linked fences with matching vinyl-coated cross bars and caps.
(2) Barbed or razor wire fences, including any fence with attached barbs, sharp points,
or razors. Electric fences, including any fence designed to produce an electric shock,
except where necessary for animal husbandry operations.
(3) Any fence, wall, and/or gate that may cause harm to people, pets, and/or wildlife due
to points, spikes, or sharpened edges on the top or bottom part of the fence, wall structure
and/or gate.
(9) Open Space/Conservation Easement Perimeter Fences.
(i) Maximum height of open space/conservation easement perimeter fences: six (6) ft.
(ii) Minimum distance of lowest fence strand or rail from ground: twelve (12) inches
above grade.
(iii) Open space/conservation easement perimeter fences shall provide openings
sufficient to accommodate the free passage of wildlife through the easement. A split-rail
wood fence (see exhibit) or equivalent design shall be required. Where a pathway is
10842 West Loyola Drive 4/11/19 16
located within an open space/conservation easement, the perimeter fence shall be
required to have at least two (2) openings at least as wide as the width of the pathway
easement.
(10) Any fence crossing or intersecting an officially designated wildlife corridor shall
conform to the requirements specified above for an open space/conservation easement
perimeter fence.
Open Space/ Conservation Easements
Open Space Policy 1.1 Provide, during the development process, for the maximum
feasible preservation of open space in and adjoining the Town, with spaces ranging in size
from regional scale to small-scale open space on individual lots.
Open Space Policy 1.4: Preserve the natural beauty and minimize disturbance of the
natural terrain and vegetation.
Open Space Policy 1.7: To the extent possible, link open spaces together visually and
physically to form a system of open spaces.
Open Space Policy 1.8: Ensure that land uses and structures are compatible with the
general open space quality of the planning area.
Open Space Policy 2.6 New residential subdivisions shall provide open space for
recreation in order to meet their appropriate share of local recreation needs.
To: Los Altos Hills Planning Department
From: Open Space Committee
Date: 14 March 2019
Property address: 27350 Julietta Lane
Date of Site Visit: 12 March, 2019
Reason for review :
New Basement
Background:
A new basement is proposed on property with extensive existing landscaping.
Trees to be
protected
Retaining wall
Fig 1. Aerial view of property. New basement underneath existing house near retaining wall
Lands of Krappe APN 182-23-012
Town
Planner
Jeremy Loh Project
Number
SD19-0014
! 1
OSC Site Review 27350 Julietta Lane Thursday, March 14, 2019
Fig 2. Retaining wall on RHS, house on LHS. Can just see oak tree in background.
Fig3. Looking back at retaining wall and oaks at South of property
! 2
OSC Site Review 27350 Julietta Lane Thursday, March 14, 2019
Approximate
Location of
Retaining
Wall
Fig. 4 Site
Plans (large
oaks not
shown)
North ->
! 3
OSC Site Review 27350 Julietta Lane Thursday, March 14, 2019
OSC Preliminary Recommendation for this Property
The lot is completely landscaped, but to protect some large oaks it would be nice to put the small
area above the retaining wall (33% slope) into an open space easement.
Final OSC recommendation
SUPPORTING INFORMATION
SLOPE AND SOIL
Average slope of lot _
Areas with slope ≥30%? YES
Check slope/LUF worksheet on subdivisions
If applicable, Review Geologic Hazard Report,
(For more information see Slope and Soil in Appendix)
CREEKS
None
! 4
OSC Site Review 27350 Julietta Lane Thursday, March 14, 2019
TREES, NATIVE VEGETATION & INVASIVE PLANTS
Heritage oaks? Yes
Significant trees? Yes
Trees proposed for removal (number and species)? No
Significant native vegetation? No
Significant invasive pest plant vegetation? No
(For more information see Trees, Native Vegetation & Invasive Plants in Appendix)
WILDLIFE CORRIDORS & FENCING
No wildlife corridors noticed
Lot is fenced
OPEN SPACE EASEMENTS (OSE)/CONSERVATION EASEMENTS (CE)
Check Town records for existing CE or OSE on this property and adjacent and nearby parcels.
No existing OSE found on this or nearby parcels
Identify on plans and attach copy (photo) of areas where OSE are recommended (slope ≥30%,
significant trees, wildlife corridor, creeks, drainage swales)
(For more information see Open Space/Conservation Easements, in Appendix)
PATHWAY EASEMENTS (PE)
Check Town records for existing or newly proposed PE on this property or adjacent and nearby
parcels. Pathway easement of 10’ along North property boarder
FOLLOW-UP
Send final copy to OSC Chair & Secretary
Upload to TraKit ?
Add address to list of easements to track on OSC agenda
! 5
OSC Site Review 27350 Julietta Lane Thursday, March 14, 2019
OSC Review 27355 Sherlock Road low res.docx 3/15/19 1
To: Los Altos Hills Planning Department
From: Open Space Committee
Date: March 14, 2019
Property address: 27355 Sherlock Road
Date of Site Visit: March 6, 2019
Lands of Lilot APN 182-30-040
Town
Planner
Jeremy Loh Project
Number
VAR19-0004
Lot Slope LUF MDA (sqft) MFA (sqft)
1.1 acres 33.9% 0.54 5609.6 3877
Reason for review
Remodel – replacing 1920’s portion of house, approximately half of existing house.
PROPERTY SUMMARY
The site is a steep, wooded, developed lot located at the end of Sherlock Road. The property
slopes downward from Sherlock Road toward a tributary of Moody Creek. The house is located at
the highest elevation, near the road. The slope for most of the property is in excess of 30% - 50%
slope, with sections in excess of 100%. Most of the lot area below elevation of 700 feet meets the
conditions for open space easement (slope, swale, oak grove). An existing barn is located near
the lowest elevation. There is a natural drainage swale with no discernable bank diagonally
through the property.
The developer has a small orchard, located in a sloped section (35% slope), below the house
surrounded with a temporary, nylon fence.
The developer has a small orchard near the house and road with a fence in excess of 6 feet.
The property was reviewed by the Open Space Committee is 2007. Report could not be found but
the committee then recommended a U shaped OSE over the steepest slopes.
OSC FINAL RECOMMENDATION
1. Dedicate an open space easement approximately below elevation line 685 feet as per the
Town’s Land Use Policy 2.5. See diagram.
2. Allow existing orchard with temporary fence within proposed Open Space Easement.
3. Allow existing barn within proposed Open Space Easement. Paths are allowed in OSE.
4. Reduce invasive weeds: French broom, Spanish broom, oxalis, Italian thistle
Date of OSC review: March 14, 2019
Voting of review: Unanimously in favor (RC, SW, WW, KG, JC, PB); Absent (NC, GC)
OSC Review 27355 Sherlock Road low res.docx 3/15/19 2
Approximate location of parcel with respect to drainages connecting to
Moody Creek.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 3
OSC Review 27355 Sherlock Road low res.docx 3/15/19 4
Oaks near road at highest elevation of parcel.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 5
Broom near road and house.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 6
Oaks, animal trail and orchard with temporary nylon fence downslope of
property. Barn is visible through trees.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 7
SUPPORTING INFORMATION
SLOPE AND SOIL
Average slope of lot _33.9%
Areas with slope ≥30%? Yes
Check slope/LUF worksheet on subdivisions na
If applicable, Review Geologic Hazard Report,
(For more information see Slope and Soil in Appendix)
CREEKS
Creeks or waterways or swale on parcel? Swale on property
Name of creek/tributary of: Moody Creek (Adobe Watershed)
Shown on USGS map? SCVWD creek map? LAH Hazard Map? EcoAtlas? X
Condition of banks? No banks
Existing riparian or OSE or SCVWD easement along creek on this property or nearby parcels?
Unknown – still researching
Does SCVWD want to expand their easement?
Proposed setbacks for structures?
Evidence of bed, banks, or Original High Water Mark (OHWM)? No
Identify any structures including fences within 25 feet of top of bank?
Within OHWM?
For more information see Creeks in Appendix.
TREES, NATIVE VEGETATION & INVASIVE PLANTS
Heritage oaks? Yes, live oaks
Significant trees? Groves of significant trees? Yes
Trees proposed for removal (number and species)? None planned for removal
Significant native vegetation? Yes, oaks, toyon
Significant invasive pest plant vegetation? Yes, milk thistle, oxalis, Italian thistle, broom
For more information see Trees, Native Vegetation & Invasive Plants in Appendix.
WILDLIFE CORRIDORS & FENCING
Check 2006 Live Oak Associates map (not official)
Evidence of wildlife (e.g., deer trails, spoor)? Yes, wildlife trails noted
Identify location and type of existing fencing: Fence higher than 6 feet around orchard SE of
house. Temporary nylon fence around orchard north (and downslope) of house.
Check that fencing on plans agrees with fencing on the ground Temporary nylon fence around
orchard downslope of house is not shown on plans
Note any fence that does not meet current fencing regulations Fence height is over 6 feet.
(For more information see Wildlife Corridors and Fencing in Appendix)
OSC Review 27355 Sherlock Road low res.docx 3/15/19 8
OPEN SPACE EASEMENTS (OSE)/CONSERVATION EASEMENTS (CE)
Check Town records for existing CE or OSE on this property and adjacent and nearby parcels.
Unknown – still researching. Request staff to review other parcels.
Identify on plans and attach copy (photo) of areas where OSE are recommended (slope ≥30%,
significant trees, wildlife corridor, creeks, drainage swales)
(For more information see Open Space/Conservation Easements, in Appendix)
PATHWAY EASEMENTS (PE)
Check Town records for existing or newly proposed PE on this property or adjacent and nearby
parcels. None
FOLLOW-UP
Send final copy to OSC Chair & Secretary
Upload to TraKit ?
Add address to list of easements to track on OSC agenda
Appendix
Slope and soil
Check for colluvial soil, earthquake faults, springs, seeps, shallow groundwater.
Safety Policy 1.1 Open space easements, zoning and other land use regulations shall be
used to limit and, in some cases, prohibit development in areas of unstable terrain, active
fault traces, water channels, flood plains, excessively steep slopes and other areas
determined to be hazardous to public welfare and safety.
Safety Policy 2.2 Locate development so as to avoid geologic hazards, including slope
instability, to the maximum extent feasible.
Land Use Policy 2.5 Steep slopes, canyons and ravines generally in excess of 30%
slope, as well as natural swales and drainage channels, and geologic hazard areas within
areas designated for residential development shall be left undisturbed and preserved in
their natural condition to the maximum extent feasible.
Land Use Policy 2.6 Limits on the development of individual residential lots shall be
determined based on evaluation of such factors as natural vegetation, topographic
characteristics, soils and geology.
Creeks
Area within the OHWM are regulated as Waters of the United States and protected by the Clean
Water Act. Any development, vegetation removal, or stream bank modifications within this area
may require permits from regulatory agencies: US Army Corps of Engineers, CA Dept of Fish and
Wildlife, Regional Water Quality Control Board.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 9
Source: US Army Corps of Engineers
Safety Policy 3.1: Leave natural channels and flood plains in a natural state,
unencumbered by development to the maximum extent feasible.
Conservation Policy 5.1: Keep or restore major drainage courses in their natural
condition insofar as possible because of their importance in supplying major vegetation,
land forms and wildlife habitat, and storm drainage.
Conservation Policy 1.3: Preserve the integrity of riparian corridors as unique and
environmentally sensitive resources.
Conservation Policy 3.1: Maintain and protect creeks and riparian corridors for
wildlife that use this resource for food, shelter, migration and breeding.
Conservation Policy 11.5: Ensure that development projects are designed to conserve
the natural slope, preserve existing native vegetation, limit invasive species, and conserve
natural drainage channels and swales.
Municipal Code 10-2.702 Siting.
(e) Creek Protection. Structures shall be set back a minimum of twenty-five (25) feet
from the top of bank of all creeks. Greater setbacks may be required along major creeks in
the Town; however, lesser setbacks may be allowed where approved by the Planning
Commission. Improvements required to all creeks shall be accomplished to appear natural
and to maintain the natural meandering course of the existing creek. Creeks and banks
shall be protected so as to remain in their natural state as much as possible. They should
not be disturbed by the building or grading process. No grading shall be allowed in creeks
or within the required setbacks from top of bank. Siting of structures shall be done with
safety as a primary concern. Safety concerns and preservation of riparian habitat are
required to be simultaneously addressed when designing development and required
improvements to creeks. (§ 15, Ord. 299, eff. December 11, 1985; §§ 6, 7, Ord. 370, eff. May
20, 1994; § 1, Ord. 504, eff. October 28, 2006)
Trees, Native Vegetation and Invasive Plants
Note in main body of form - major infestation of invasive weeds such as stinkwort, oxalis, Italian
thistle, purple starthistle, yellow starthistle, pampas grass, broom, teasel, giant reed (Arundo
donax), poison hemlock, etc.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 10
Conservation Policy 2.2: Minimize disturbance of the natural terrain and vegetation.
Preserve and protect native and naturalized plants, with special attention to preservation
of unique, rare or endangered species and plant communities such as oak woodlands.
Conservation Policy 2.3: Preserve and protect Heritage Trees, including native oaks and
other significant trees, on public and private property.
Conservation Policy 11.5: Ensure that development projects are designed to conserve
the natural slope, preserve existing native vegetation, limit invasive species, and
conserve natural drainage channels and swales.
Conservation Program 2.5 Encourage the dedication of conservation/open space
easements or the public acquisition of areas that are rich in wildlife or of a fragile
ecological nature to ensure their protection
Open Space Policy 1.2: Protect and maintain those areas necessary to the integrity of
natural resources and processes, with special emphasis on, but not limited to, the
groundwater recharge and drainage system, open spaces vital for wildlife habitat,
open spaces suitable for agriculture, and other areas of major or unique ecological
significance.
Land Use Program 2.3 Encourage the preservation of existing trees, rock outcroppings,
ridgelines and other significant natural features
Municipal Code 10-2.702 Siting.
(f) Tree Preservation. Every feasible attempt should be made to preserve existing trees
except those trees identified in the Los Altos Hills Landscape Guidelines invasive plant
CA FOOD AND AGRICULTURAL CODE - FAC
DIVISION 4. PLANT QUARANTINE AND PEST CONTROL [5001 - 8808]
5401.
Any premises, plants, conveyances or things which are infected or infested with any pest,
or premises where any pest is found, are a public nuisance, and shall be prosecuted as
such in all actions and proceedings. All remedies which are given by law for the prevention
and abatement of a nuisance apply to such a public nuisance.
Wildlife Corridors and Fencing
Conservation Policy 2.7: Avoid the development of environmentally sensitive areas that
are rich in wildlife or of a fragile ecological nature, such as areas of rare or endangered
species of plants, or riparian areas.
Conservation Goal 3: Maintain and enhance the integrity of wildlife habitat.
Conservation Program 3.3: Assess the potential for development patterns to fragment
and isolate significant wildlife habitats.
Conservation Section 315: Planning for natural movement of wildlife can help avoid,
minimize and compensate for serious negative impacts on wildlife and humans. Areas
that link wildlife habitat have become vital because native animals such as deer, fox,
bobcat, and coyote are prevented by roads, fences, homes and other development from
moving freely as they once did.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 11
Municipal Code 10-1.507 (d) Prohibited Fences, Walls, Gates, and Column Types. The
following fences are prohibited:
(1) Chain-link or cyclone fences, including any fence with bare lengths of wire stretched
between metal poles, with the exception of dark green, black, or brown vinyl-coated chain-
linked fences with matching vinyl-coated cross bars and caps.
(2) Barbed or razor wire fences, including any fence with attached barbs, sharp points,
or razors. Electric fences, including any fence designed to produce an electric shock,
except where necessary for animal husbandry operations.
(3) Any fence, wall, and/or gate that may cause harm to people, pets, and/or wildlife due
to points, spikes, or sharpened edges on the top or bottom part of the fence, wall structure
and/or gate.
(9) Open Space/Conservation Easement Perimeter Fences.
(i) Maximum height of open space/conservation easement perimeter fences: six (6) ft.
(ii) Minimum distance of lowest fence strand or rail from ground: twelve (12) inches
above grade.
(iii) Open space/conservation easement perimeter fences shall provide openings
sufficient to accommodate the free passage of wildlife through the easement. A split-rail
wood fence (see exhibit) or equivalent design shall be required. Where a pathway is
located within an open space/conservation easement, the perimeter fence shall be
required to have at least two (2) openings at least as wide as the width of the pathway
easement.
(10) Any fence crossing or intersecting an officially designated wildlife corridor shall
conform to the requirements specified above for an open space/conservation easement
perimeter fence.
Open Space/ Conservation Easements
Open Space Policy 1.1 Provide, during the development process, for the maximum
feasible preservation of open space in and adjoining the Town, with spaces ranging in size
from regional scale to small-scale open space on individual lots.
Open Space Policy 1.4: Preserve the natural beauty and minimize disturbance of the
natural terrain and vegetation.
Open Space Policy 1.7: To the extent possible, link open spaces together visually and
physically to form a system of open spaces.
OSC Review 27355 Sherlock Road low res.docx 3/15/19 12
Open Space Policy 1.8: Ensure that land uses and structures are compatible with the
general open space quality of the planning area.
Open Space Policy 2.6 New residential subdivisions shall provide open space for
recreation in order to meet their appropriate share of local recreation needs.
OSC_Recommendation_Grassroots19-0322.docx 1
____________________________________________________________________________________________________________
To: Nichol Bowersox, LAH City Engineer/Public Works Director
Carl Cahill, LAH City Manager
Date: March 22, 2019
Subject: Open Space Committee recommendation to allocate funds for Grassroots Ecology to
continue work in Town open space preserves and Westwind Community Barn land
From: LAH Open Space Committee
____________________________________________________________________________________________________________
The Open Space Committee (OSC) fully supports allocating up to $90,000 from the FY 2019-20
budget for Grassroots Ecology to continue their stewardship and educational activities in
Town-owned open space preserves and the pollution prevention project at Westwind
Community Barn. At the March 14, 2019 OSC meeting, the committee voted unanimously to
support continued funding for Grassroots Ecology at a level that will allow them to maintain
and expand the progress made in the past five years. OSC strongly recommends a multi-year
contract from July 2019 through June 2022 (allocating at minimum $80,000 per year or
$245,000 over 3 years).
If Town finances allow, OSC strongly recommends allocation of an additional $5,000 to
$10,000 annually to fund additional workdays each year to cover the increased work load
related to the new Westwind Community Barn pollution prevention project (i.e., allocate
$85,000 to $90,000 per year; $260,000 to $275,000 over 3 years).
The contract will cover educational activities and vegetation management in Byrne, Juan
Prado Mesa and O’Keefe Open space preserves, and pollution prevention at the lower
Westwind Community Barn (WWCB) floodplain restoration site:
• Community education and public outreach (10 or more educational events; 30 or more
volunteer work days; 3 San Jose Conservation Corps workdays)
• Continued invasive plant removal; update of Vegetation Management Plan for all three
preserves
• Mowing recommendations to optimize impact on invasive plant reproduction
• Meetings with Town maintenance crew for mowing and other maintenance activities
• Native plant installation and revegetation (install natives at WWCB site; maintain
previously installed plants along creek and other sites; plant oaks, buckeye, and willow
from locally sourced seed and stakes)
• Continue photo-monitoring and provide quarterly progress reports to the Town
• Floodplain hydrology modifications to reduce WWCB pollution from entering Moody
Creek
OSC has closely followed Grassroots Ecology’s work since they were selected (as Acterra) in
2014 to conduct stewardship and educational activities for the Town. This group has
exceeded their contract deliverables — and committee expectations — every year since 2014
and is on track to do so again this year.
Vegetation Management and Restoration
Grassroots Ecology’s vegetation management plans for Byrne, O’Keeffe, and Juan Prada Mesa
have produced dramatic reductions in invasive pest plants, resulting in reduced fire hazard,
enhanced habitat, and improved aesthetics and recreation value. They have nearly extirpated
OSC_Recommendation_Grassroots19-0322.docx 2
several high-priority invasive species from Byrne (purple star thistle, teasel, stinkwort) and
are making progress controlling other invasives. Removal of pest plants has led to robust
passive regeneration of native plants in many locations, and installation of locally-native
plants is reviving other more degraded areas.
Restoration work in the Moody Creek tributary and flood plain in Byrne Preserve is stabilizing
the creek banks, reducing erosion, enhancing native plant biodiversity, and improving water
quality. The pollution prevention project on Westwind Community Barn property, started in
July 2018, has already improved a badly degraded area and is improving water quality in
Moody Creek by slowing and filtering storm-water run-off from the horse facilities.
A greater diversity of wildlife is evidence of improved habitat. Bird species are now present or
more abundant in our open spaces (e.g., western bluebird, barn owl, lesser goldfinch, white-
breasted nuthatch, white-tailed kite, Cooper’s hawk, golden eagle). Increased populations of
Pacific chorus frog, California hare, grey fox, and bobcat have been reported.
Reduction in Fire Hazards
Massive reduction in the number of invasive plants has significantly reduced fire fuel loads in
the preserves. Each year since 2014, Grassroots has provided guidance for mowing grasslands
in O’Keeffe and Byrne. Mowing has improved aesthetics, reduced invasives, and significantly
reduced biomass that supports wildfire intensity and spread. The July 2017 fire in Byrne
would almost certainly have been more serious if the burn area had not been mowed in the
three prior years. Also, removal in 2014 of a large stand of highly flammable stinkwort —in
the direct path of the advancing fire—likely prevented the fire from moving from the
grassland to the adjacent shrubs and on up to Central Drive.
Community Engagement and Education
Grassroots’ educational and community activities have increased awareness and appreciation
for open space and the importance of maintaining healthy lands. Since 2014, Grassroots has
engaged 3,000 children, teens, and adults in volunteer workdays and educational events such
as weeding, weed ID sessions, nature walks, night hikes, and classroom programs. Community
participants included LAH residents, students from local schools, and corporate, faith-based,
and service groups.
Byrne Preserve is the gem of our open space and a destination for many, including residents
beyond our Town limits. Many Town activities are held at Byrne Preserve and the adjacent
Westwind Community Barn and the health of the land reflects our Town’s value of natural
resources— a value clearly stated in our Town’s General Plan.
Grassroots Secured Funding from Outside Sources
Grassroots has brought in nearly $200,000 in grant money from the Santa Clara County Water
District (SCVWD) to fund improvements in LAH-owned open space preserves:
• 3-year SCVWD Clean, Safe Water and Natural Flood Protection Program grant to restore
the tributary and flood plain of Moody Creek in Byrne Preserve ($137K; Jul 2016 to Jun
2018)
• 3-year SCVWD Pollution Prevention Grant to mitigate erosion and filter storm water run-
off from the horse facilities at Westwind Community Barn ($54K; Jul 2018 to Jun 2021)
In addition, Grassroots Ecology supplemented the grant projects with volunteer services
valued at over $70,000 over the three-year period. The Town also benefits from unrestricted
OSC_Recommendation_Grassroots19-0322.docx 3
funds Grassroots receives from other organizations to support education and program
oversight. OSC will continue to work with Grassroots to identify future grant opportunities.
Expertise and Professionalism
Grassroots Ecology has a highly knowledgeable, well-organized professional staff that is
committed to all aspects of their work and has been extraordinarily responsive to the Town
and OSC. LAH staff and maintenance crew, volunteers, and OSC members all have provided
highly positive feedback about this organization.
OSC Recommendation
OSC discussed Grassroots Ecology’s progress at their March 14, 2019 meeting and voted
unanimously to recommend Council approve continued funding to maintain and accelerate
the work accomplished in the first five years and strongly recommended a multi-year
contract.
LAH residents value our open space preserves and enjoy the many benefits they provide. The
Town has a responsibility to manage these lands to protect and enhance their unique
conservation and recreation value. Although Grassroots Ecology has made tremendous
progress, further work is needed. Continued stewardship will ensure that the natural
resources on these public lands are available for future generations to enjoy.
OSC greatly appreciates the oversight and assistance that Public Works Director Nichol
Bowersox and her staff have provided to Grassroots Ecology in this endeavor. OSC members
and associates will continue to work closely with Public Works to help make this project a
continued success.
Sincerely,
LAH Open Space Committee
4/12/19
To: Los Altos Hills Public Works Department
From: Open Space Committee
Date: March 14, 2019
Re: Observations for Green Stormwater Infrastructure and other Creek Pollution Issues in
Los Altos Hills
Green Stormwater Infrastructure provides multiple benefits for our Town. Filtering and slowing
stormwater before it reaches our creeks can improve water quality, increase groundwater
recharge, reduce erosion and reduce flooding.
Benefits:
• Reduced pollution in streams and bay, both pollutants of concern and trash
• Increase groundwater recharge
• Reduced flooding
• Reduce erosion in streams
• Improved urban aesthetics
• Traffic safety, pedestrian safety
• Improved habitat
The Open Space Committee has made the following observations in stormwater management
and other opportunities to improve the health and quality of our creeks.
Issue: Road source pollutants
Findings:
1) Interstate 280 is the largest source in Town of motor oil, tire particles, antifreeze, and heavy
metals contaminants entering our creeks. There are multiple asphalt swales directing
stormwater from 280 into our creeks, specifically at Matadero Creek, Deer Creek, Robelda
Creek, Purisima Creek, Adobe Creek, Hale Creek, and Loyola Creek. Although the Town is
unable to modify Caltrans property, construction of green stormwater filtration basins is
possible.
2) There are many locations where stormwater traverse roads or travels long distances along
roads carrying contaminants into storm drains and creeks. Minimizing concrete swales and
keep water from traversing roads will minimize contaminants in our streams. Here are a few
examples.
a) On Altamont Road, stormwater travels along a concrete swale as well as and traverses
Altamont Road flowing into Byrne Preserve. Asphalt roadside structures direct water that
would have naturally flowed to Matadero Creek to now flow into Moody Creek (Adobe
Watershed). The redirection of flow created erosion in Byrne Preserve. A grant from
Santa Clara Valley Water District in partnership with the Town and Grassroots Ecology is
repairing the erosion. However, roadside improvements would decrease flow volume into
Byrne Preserve.
b) Stormwater traversed Page Mill Road near Moon Lane carrying contaminants into
Matadero Creek and creating a traffic hazard for motorist during icy conditions. The Open
Space Committee commends the Public Works Department for the curb cuts along this
section of Page Mill Road, keeping the majority of stormwater from traversing the road and
improving traffic safety.
4/12/19
c) Stormwater is carried across Duval Lane and along Robleda creating a traffic hazard in icy
conditions and increased contaminants in Robleda Creek (Adobe Watershed).
d) Recent (~2016) addition of a curb and asphalt swale to the property at Burke Road and
Chapin Road now directs stormwater onto the road and into a storm drain. The Open
Space Committee recommends against this type of stormwater manangement. See photo.
e) There are multiple storm drains throughout town. How these drains connect to creeks
and the volume carried is unknown to our committee. We recommend a dry season
survey of our streams to determine the largest discharge areas of stormwater. Erosion
patterns will help determine discharge volumes.
Issue: Trash in our streams stem from three major sources.
Findings:
1) Interstate 280: Trash is evident along 280, spilling on to our roads and creeks. In February
2019, the Regional Water Quality Control Board ordered Caltrans to collect trash.
2) Foothill College: Parking permit stubs, food containers and cigarette butts are the most
common trash found in Adobe Creek on Foothill College campus.
3) Fremont Hills Country Club: Tennis balls and food containers are the most common trash
found in Deer Creek adjacent to Fremont Hills Country Club.
The Open Space Committee recommends the Public Works Department coordinate with Parks &
Rec on creek or roadside clean ups with the Youth Commission and other service organizations.
National River Cleanup Day is the third Saturday in May and Coastal Cleanup Day is the third
Saturday in September. Santa Clara Valley Water District supports activities for both of these
cleanup events. Communication about trash removal with Caltrans, Foothill College and Fremont
Hills Country Club is recommended.
Issue: Horse manure runoff from horse facilities
Findings:
1) Runoff from Westwind Community Barn flows to Moody Creek. The Town of Los Altos Hills in
partnership with Grassroots Ecology has been granted funds by Santa Clara Valley Water
District to reduce horse manure contaminants from entering Moody Creek.
2) The horse manure management at Fremont Hills Country Club is unknown and should be
evaluated. The facility is adjacent to Deer Creek.
Issue: Fertilizer runoff from lawns, orchards and vineyards
Findings:
1) There are several properties with lawns, orchards or vineyards adjacent to streams. The
Open Space Committee recommends continued protection of creekside land with Open Space
Easements and urges restriction of fertilized landscapes within 25 feet of creeks. Fertilizers
create algae blooms with subsequent reductions in dissolved oxygen endangering the native
fish and aquatic organisms in our creeks.
Issue: Pond management on private property
Findings:
1) Stonebrook Pond created by the old Neary Quarry is connected to Hale Creek. Annual
maintenance by the HOA is unknown but additives are evident each year. In addition,
multiple golf balls by residents are regularly launched into the pond.
4/12/19
2) The maintenance of the pond on Seton property on Altamont Road is unknown. The pond
connects to Adobe Creek.
Issue: Traffic safety, pedestrian safety
Findings:
1) Stormwater traversing roads can cause traffic hazards for motorist during icy conditions.
Modifications to direct stormwater off roads is recommended. The recent modification of
Page Mill Road is an excellent example.
2) A pedestrian was killed crossing Page Mill Road near Central Drive and Moody Creek. A
trailhead for Foothills Park exists here. Although signs warn pedestrians to not cross at this
location, no alternate route has been provided. Weekly, pedestrians are observed crossing
near this location. There are drainage and soil movement problems here adjacent to Moody
Creek. Our committee recommends a coordinated evaluation of this area with the Pathway
Committee and Public Works, possibly including the City of Palo Alto. Many Town residents
meet Palo Altans at Foothills Park and a safe passage connecting our Towns is recommended.
Issue: Improve habitat
Findings:
1) A section of Deer Creek near Arastradero Road is confined to a concrete channel on Santa
Clara Valley Water District’s property. There may be an opportunity to restore this reach to a
natural channel either through mitigation requirements or grant projects. The benefits
include improved habitat, increased groundwater recharge, and reduced contaminants.
2) Large stands of Arundo donax exist on private properties (Deer Creek, Adobe Creek). Santa
Clara Valley Water District has mapped these areas. Coordination with property owners and
the Valley Water is recommended to remove this invasive plant.
4/12/19
1
2 4
5 6
4/12/19
3
8
7
4/12/19
Map location 1: Example of asphalt swale directing storm water from 280 to Deer Creek at La Barranca
4/12/19
Map location 2: Example of asphalt swale directing storm water from 280 to Robleda Creek
4/12/19
Map location 3: Example of Asphalt swale directing storm water from 280 to Loyola Creek
4/12/19
Map location 4: Built asphalt berm directs water across Altamont Road and into Byrne Preserve
4/12/19
Map location 5: Recently built curb and swale directs water into storm drain rather than ground infiltration at Burke & Chapin.
4/12/19
Map location 6: Debris near Deer Creek at Fremont Hills Country Club
4/12/19
Map location 6: Trash near Deer Creek at Fremont Hills Country Club
4/12/19
Map location 6: Tennis balls near Deer Creek at Fremont Hills Country Club
4/12/19
Map location 7: Trash in Adobe Creek at Foothill College, broken cigarette butt containing spilling into creek.
4/12/19
Map location 8: Additives in Stonebrook Pond. Golf balls are regularly hit into the pond.