CC RES 1992-121 RESOLUTION NO. 92-121
A RESOLUTION OF THE CITY COUNCIL OF THE CITY
OF RANCHO PALOS VERDES APPROVING GRADING
APPLICATION NO, 1390
WHEREAS, on November 21, 1989 the City Council of the City
of Rancho Palos Verdes adopted Resolution No. 89-109 approving
Conditional Use Permit No, 79-2nd Revision and Tentative Tract
Map No. 37885-2nd Revision for the creation of forty-two (42)
residential lots and two (2) common open space lots on an
approximately 163-acre site located north and west of the
intersection of Forrestal and Pirate Drives, east of Klondike
Canyon, and south of the City of Rolling Hills; and
WHEREAS, the subject property is the site of a former quarry
operation which created unique topographic features and geologic
hazards on the site; a near vertical cut slope exists on the
north side of Forrestal Drive and presents a safety hazard due to
rock ravelling and sloughing; the deep quarry bowl located in the
eastern portion of the site also presents a hazard due to the
very steep slopes in the bowl; small landslides exist in the
quarry bowl and apparently were formed by the loss of toe support
resulting from the former quarry activities, scour, and erosion;
and
WHEREAS, the site is presently unsafe for development due to
its extreme slopes, and risks of rockfall, mudflow, erosion, and
debris flow, which risks are exacerbated by an apparently
inactive fault on the project site and several active faults in
the vicinity which can be expected to generate significant
ground-shaking on the site; and
WHEREAS, the conditions of approval of Conditional Use
Permit No. 79 as approved on November 21, 1989 require the
developer to devise a grading plan which will eliminate these
hazards and make the site safe for the development proposed in
the applications for Conditional Use Permit No. 79-2nd Revision
and Tentative Tract Map No. 37885-2nd Revision and to obtain a
grading permit for that grading plan prior to approval of the
Final Tract Map; and
WHEREAS, on December 1, 1989 the developer submitted Grading
Application No. 1390 and Environmental Assessment No. 596 for the
approval of approximately 810, 000 cubic yards of grading for
development of the residential portion of the proposed
development and approximately 1, 050, 000 cubic yards of remedial
grading in the former quarry areas to correct identified geologic
hazards on the property; and
WHEREAS, a Draft Supplemental Environmental Impact Report
(DSEIR) was prepared and circulated in accordance with the State
of California Environmental Quality Act Guidelines, 2 Calif. Code
of Regs. SS 15000 et seq. , which analyzed the environmental
impacts of the proposed grading plan and potential revisions to
said grading plan; and
WHEREAS, after notice issued pursuant to the City's
Development Code, the Planning Commission of the City of Rancho
Palos Verdes held a public hearing on September 24, 1991 to
consider Grading Application No. 1390 and the Final Supplemental
Environmental Impact Report (FSEIR) at which time all interested
parties were given an opportunity to be heard and to present
evidence; and.
WHEREAS, on October 8, 1991 the Planning commission adopted
resolutions approving Grading Application No. 1390 and certifying
the FSEIR; and
WHEREAS, on October 21, 1992 the Seaview Homeowners
Association filed a timely appeal of the Planning- Commission's
approval of the grading permit and certification of the FSEIR;
and
WHEREAS, the City Council after holding duly noticed public
hearings to consider the appeal of Grading Application No, 1390
and the FSEIR on December 3 , 1991, December 17, 1991, February
18, 1992 , June 16, 1992, and July 7, 1992, at which time all
interested parties were given an opportunity to be heard and to
present evidence, sustained the appeal of the Seaview Homeowners
Association and denied Grading Application No. 1390; and
WHEREAS, in September 1992, the developer submitted a
modified grading plan substantially addressing the environmental
concerns raised by the City Council with respect to previously
denied Grading Application No. 1390. The modified plan involves
moving Forrestal Drive slightly to the south and extending the
quarry slope grading to the east by creating a fill slope
adjacent to the quarry slope trimming. By so doing, the grading
can be balanced on-site and the off-site export of material can
be avoided. Additionally, a minimum amount of fill (10, 000 cubic
yards) will be placed in the quarry bowl to eliminate identified
drainage deficiencies in the bowl; and
WHEREAS, an Addendum to the Supplemental Environmental
Impact Report which analyzed the environmental impacts of
modified Grading Application No. 1390 was prepared and circulated
for thirty (30)- days; and
Resolution No. 92-121
Page 2
WHEREAS, after notice issued pursuant to the City's
Development Code, the Planning Commission of the City of Rancho
Palos Verdes held public hearings on November 10, November 21,
and November 24, 1992 , to consider the modifications to Grading
Application No. 1390 and the Addendum to the Supplemental EIR at
which time all interested parties were given an opportunity to be
heard and to present evidence; and
WHEREAS, the City Council held a duly noticed public hearing
on December 7, 1992 , to consider the modifications to Grading
Application No: 1390 and certification of the Supplemental EIR
and Addendum at which time all interested parties were given an
opportunity to be heard and to present evidence.
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF RANCHO PALOS
VERDES DOES HEREBY FIND, DETERMINE, AND RESOLVE AS FOLLOWS:
Section 1: That the foregoing recitals are true and
correct.
Section 2 : That the approximately 11972 , 000 cubic yards of
grading proposed is not excessive beyond that necessary for the
permitted primary use of the lot within the meaning of Section
17 .50. 070 (A) of the Development Code because the applicant, after
fully exploring ex lorin alternative project designs, has modified the
grading plan to dispose of excess cut materials on the site in a
manner that does not cause unacceptable adverse environmental
impacts, previously identified geologic hazards on the site will
be eliminated, impacts to biological resources will be minimized,
visual relationships of the unique topography of the site will be
substantially preserved, drainage deficiencies identified on the
site will be corrected and impacts related to the off-site export
of excess cut material will be avoided.
Section 3 : That the grading will not significantly or
adversely affect visual relationships with neighboring sites
within the meaning of Section 17. 50. 070 (8) of the Development
Code as 1) the quarry slope remedial grading will be performed in
a manner which minimizes grading quantities and achieves a more
aesthetically pleasing cut slope by creating a jagged gradient,
more akin to the existing slope while still eliminating the
previously identified geologic hazards on the site, 2) the graded
development site, and graded quarry slope will be re-vegetated to
reduce the visual impact from neighboring sites, and 3) the
minimal grading to eliminate drainage deficiencies at the bottom
of the quarry bowl will preserve the unique topography of the
bowl, as well as most of the valuable coastal sage scrub within
the bowl area. Thus the modified grading plan, which includes a
replacement/enhancement program to create 32 . 1 additional acres
of quality coastal sage scrub, is consistent with the goals of
ensuring the maximum preservation of the natural scenic character
Resolution No, 92-121
Page 3
of the City, the maximum retention of groundcover, and the
maintenance of *the visual continuity of hills and valleys, as
required by Section 17. 50. 010 of the Development Code. -
Section 4: That the nature of the proposed grading
minimizes disturbance to the existing contours of the site within
the meaning of Section 17 .50. 070 (C) of the Development Code
because theproposed grading, as modified, involves th-e creation
of a fill slope and the trimming of the quarry slope l*n . a manner
T
which reasonably matches the variable gradients which presently
exist on the site and the minimal grading in the quarry bowl
floor which, while eliminating the geologic hazards created by
the former quarrying activities on the site and the drainage
deficiencies of the bowl, will still preserve the existing
contours of the quarry bowl.
Section 5: That the application is consistent with the
requirements of Section 17 ,50. 070 (D) (3) (a) because the proposed
grading on slopes in excess of thirty-five percent will eliminate-
_
the geotechnical safety hazards currently present on theproject
site and by so doing will enhance the public health, safety, and
welfare.
Section 6:, That the application is consistent with the
requirements of Section 17 .36. 040(C) because the grading will
correct existing geotechnical hazards associated with the quarry
face created by previous quarrying activity on the site.
Section 7;- That the proposed grading is consistent with the
goals and policies of the City's General Plan, although a
majority of the grading would occur in areas included in
"Resource Management Areas" designated in the City's General Plan
Land Use Map, for the reasons detailed below:
(a) Portions of the site are designated "RM 2 - Extreme
Slope" , a district described by the General Plan as intended "to
regulate use, development and alteration of land in extreme slope
areas so that essential natural characteristics such as land
form, vegetation and wildlife communities, scenic qualities and
open space can be substantially maintained* The district further
considers the risks,/ to public safety from, earth slides and
slips, erosion and attendant siltation. " The proposed grading,
as modified, is de$'igned to substantially maintain the landform
of the site ' and minimize impacts on valuable vegetation and
wildlife communities, including the California gnatcatcher, the
cactus wren, the rufous crowned sparrow, Astragalus trichopodus,
the host plant of the possibly extinct, endangered Palos Verdes
Blue Butterfly, and the Crossosoma californicum, while removing
or abating existing geotechnical risks to public safety created
by former quarrying activities on the project site.
Resolution No. 92-121
Page 4
The General Plan also states that, with respect to a site in
the RM 2 district, " [d]etail[ed] engineering/geologic study must
accompany any proposal for development or use and must
demonstrate to the satisfaction of the City that the proposed
development or use requires no alteration of topography,
significant risk to human life or significant adverse
environmental impact. " The modified grading plan has been
analyzed through an Addendum to the Supplemental EIR which
concluded that the geotechnical benefits provided by the project
outweigh any unavoidable significant adverse environmental
impacts to the site.
(b) The General Plan's policies for the RM 9 - Natural
Vegetation District include the following: "The wild flowers,,
low coastal sage scrub, chaparral, and grasslands communities
should be retained wherever possible. Any proposed development
within this district should seek to revegetate with native
material whenever clearing of vegetation is required. " The
proposed grading includes mitigation to reduce impacts to coastal
sage scrub habitat, designated as "significant natural plant
community" in the General Plan and described by the Addendum to
the DSEIR as "a critical resource because of its value as habitat
for the California gnatcatcher and numerous other species. " The
project mitigation includes a replacement/enhancement program to
create 32 . 1 acres of additional quality habitat on the project
site. Further, the project, as modified will avoid direct
impacts on identified plants of the species Astragalus
trichopodus and Crossosoma californicum.
The portions of the site within the RM 9 district are also
included by the General Plan Natural Environment Control
District. Among the policies applicable to that district is the
following: "Site activities shall regulate use, development, and
alteration of land in slope areas, so that essential natural
characteristics, such as land form, vegetation and wildlife
communities, ground water recharge, scenic qualities, and open
space can be substantially maintained. " The modified grading
plan maintains the existing natural characteristics of the site,
since it minimizes impacts to the existing landforms, preserves
open space, and minimizes impacts on plant and animal life.
Section 8: That, as detailed in the geotechnical and
engineering reports prepared for this proposal, the grading
necessary to eliminate geologic hazards associated with the
quarry slope north of Forrestal Drive will generate some excess
cut materials which the applicant, through the modified grading
plan, proposes to use to create a fill slope adjacent to the
quarry slope cut. The fill slope will result in less impacts to
biological resources as compared to the same fill amount in the
quarry bowl, will blend aesthetically with the adjacent gradient
quarry slope cut, will be geotechnically feasible with the
Resolution No. 92-12.1
Page 5
appropriate grading and engineering recommendations and will
eliminate the adverse environmental impacts to air quality,
traffic and noise associated with the off-site export of cut
material.
Section 9: The City Council declares the Final Supplemental
Impact Report (FSEIR) and Addendum were prepared in accordance
with the California Environmental Quality Act (CEQA) in
compliance with City and State guidelines; and the City Council
reviewed and considered the contents of the FSEIR and Addendum in
reaching its decision on the project. The City Council further
adopts and incorporates by reference the environmental findings
and statement of overriding considerations set forth in City
Council Resolution No. 92-121.
-Section 10: For all the reasons stated above and based on
information and findings included in the Supplemental
Environmental Impact Report (SEIR) and Addendum, Staff Reports,
minutes, records of proceeding, and evidence presented at the
public hearings, the City Council hereby approves Grading
Application No. 1390, subject to the attached conditions
contained in Exhibit "A", which are necessary to protect the
public health, safety, and general welfare in the area.
PASSED, APPROVED, and ADOPTED this 7th day of December
1992 .
y -0.
4
Wf
ayor
ATTEST:
J Purcell
' My i Clerk
STATE OF CALIFORNIA )
COUNTY OF LOS ANGELES ) ss
CITY OF RANCHO PALOS VERDES )
I, JO PURCELL! City Clerk of the City of Rancho Palos
Verdes, hereby certify that the above Resolution No. 92- 12r,was
duly and regularly passed and adopted by the said City Council at
a regular meeting held on December 7 1992 .
(JHR2-A 819.MGC)
X-1UJ_JEXAyC_LTX-`LTk' RANUMU =
PAL RD E S
Resolution No, 92-12:1
Page 6
EXHIBIT "A"
CONDITIONS OF APPROVAL
GRADING APPLICATION NO. 1390
A. GENERAL
1. Within thirty (30) days of adoption of the Resolution
approving Grading Application No. 1390, the developer shall
submit, in writing, a statement that he has read and
understands all conditions of approval.
2 . The Developer shall adhere to all previously approved
Conditions of Approval of Conditional Use Permit No, 79-
Second Revision, as described in City Council Resolution
89-109, and Tentative Tract Map No. 37885-Second Revision,
as described in City Council Resolution 89-110, except as
modified herein. If for any reason the conditions of
Grading Application No. 1390 are in conflict with the above
referenced Conditional Use Permit and Tract Conditions, the
stricter shall apply.
3 . Prior to recordation of the final map or prior to
commencement of work, whichever occurs first, a bond, cash
deposit, or other City approved security, shall be posted to
cover the costs of grading in an amount to be determined by
the City Engineer.
4. Development of the project will comply with all applicable
Code and ordinance requirements for construction and
grading.
5. No vegetation clearing of any kind, site preparation or
grading shall occur on any portion of the property
until issuance of a grading permit by the Department of
Environmental Services.
6. Prior to grading permit issuance, a grading plan
designed pursuant to all of the recommendations of the
City's geotechnical consultant and geotechnical
conditions of approval contained herein (Section E) ,
shall be submitted by the developer to the Director of
Public Works for review and approval.
Bo GRADING
11 The grading operation shall be limited to that necessary to
develop the residential tract (creation of lots and streets)
and to perform remedial grading, as designated on the
submitted and approved grading plan. Grading quantities
shall be in substantial compliance with the following cut
and fill quantities:
A) Development Grading
Development Area Cut: 456, 000 cubic yards
Development Area Fill: 271, 000 cubic yards
B) Remedial Grading
Development Area Cut: 350, 000 cubic yards
Development Area Fill: 350,000 cubic yards
Quarry Slope Cut: 180,000 cubic yards
Quarry Slope Fill: 355, 000 cubic yards
Quarry Bowl Fill: 10, 000 cubic yards
The above quantities for the development area - remedial
grading are approximate only and may vary with actual
site conditions, as required by the City's geotechnical
consultant or site geologist. The remaining quantities
do not include grading for installation of the required
low-permeable cap over the residential lots and, if
necessary, removal of I'mudflow" deposits,, as specified
in condition E,2,A, 1,a.
2 . The grading configuration for the quarry slope face
shall 'involve trimming the slope at gradients of . 75: 1,
1: 1, and 1.5: 1. The adjacent fill slope shall be
placed at a 1.5: 1 slope gradient.
3 . The minimum amount of fill necessary to create positive
drainage and correct drainage deficiencies in the bowl,
not to exceed 101, 000 cubic yards, shall be placed in
the quarry bowl basin to the satisfaction of the
Directors of Environmental Services and Public Works.
4 , There shall be no off-site exportation of fill material.
All cut and fill quantities shall be balanced on site.
5. There shall be no blasting or use of specialized rock
crushing equipment for carrying out the grading activity.
6. The south-facing buttress fill slope at the southeastern
corner of the tract which is part of the proposed grading
Exhibit "All
Page 2
Resolution No, 92-121
for the residential development area shall not exceed a
gradient of 1. 5: 1.
7. Any major revisions to the grading quantities or
methods described above shall require approval of a
Revision to Grading No. 1390 by the Planning
Commission.
CO GRADING/CONSTRUCTION PLAN
1. A grading/construction plan shall be submitted to the
Director of Environmental Services prior to any grading
permits being issued. Said plan shall include but not be
limited to the following:
A) A phasing plan
B) Limits of grading
C) Estimated length of time for rough grading and
improvements
D) Location of construction _trailer, construction signs,
equipment storage area, and location and type of
temporary utilities
2 . Prior to issuance of grading permits, a Circulation and
Safety Plan and Program will be prepared and funded by the
Developer which will include:
A) Safety Training and Indoctrination
B) Truck Inspection Program
C) Route Designation
D) Truck type
E). Dust Control
3 . Prior to the issuance of grading permits or any work on-
site, a traffic control plan designed by a registered
traffic engineer shall be submitted to, and approved by, the
Director of Public Works. The plan shall include provisions
for flagmen, signage, lane closures, and any other measures
necessary to assure safe and adequate ingress and egress at
the site.
4. The grading activity on the site shall not disrupt the
recreational activities at the Ladera Linda Community Center
and on the adjacent Portuguese Bend playing fields. As
such the grading operations involving the re-construction
and alignment of Forrestal Drive and any other grading
activity located on or within 100 feet of the Portuguese
Bendp laying fields shall only be performed from January to
Exhibit "A"
Page 3
Resolution No. 92-121
May so as not to disrupt the recreational activities which
are concentrated between June and December. This limitation
may be modified by the Director of Environmental Services or
Director of Recreation and Parks if recreational schedules
on the fields change.
5. Prior to' issuance of the grading permits, the developer
shall submit a plan to the Director of Environmental
Services to construct a permanent, two-lane ramp projecting
from Forrestal Drive (where a driveway apron currently
exists) to permanently eliminate the need to access the
soccer field parking lot off of Mainsail Drive. The
construction of the ramp shall provide both temporary
(during grading and development of the tract) and permanent
access to the soccer field parking lot from Forrestal Drive.
6. To ensure the community's accessibility to Ladera Linda,
flagmen shall monitor the ingress and egress of any trucks
or heavy equipment which may traverse access points to the
Ladera Linda Community Center and its related facilities.
7 . As required under the previously approved tract conditions
of approval of Tentative Tract Map No. 37885 (STREETS, No.
6) , the developer shall be responsible for repairs to any
neighboring streets which may be damaged during development
of the tract, including but not limited to the designated
access route(s) to the tract for any trucks or heavy
equipment. Prior to issuance of grading permits, the
developer shall post a bond, cash deposit, letter of credit
or other City approved security in an amount sufficient to
cover the costs to make permanent repairs of any damage to
streets and appurtenant structures as a result of this
development. In addition to providing such security, the
developer shall pay for a pavement analysis of the streets
to be used as designated access routes for any trucks or
heavy equipment prior to the start of construction, and at
completion of construction. The developer shall provide
compensation for any loss of pavement life as determined by
this study along the designated access routes for any trucks
or heavy equipment that may occur as a result of this
development.
8 . Prior to issuance of grading permits and/or building
permits, a plan and program to control and prevent dust and
windblown earth problems shall be submitted to the Director
of Environmental Services for review and approval. Methods
may include but shall not be limited to requiring truck
covers, an on-site truck wash down station, street sweeping
and on-site grade watering.
Exhibit "All
Page 4
Resolution No. 92-121
9. All construction and grading activities, including arrival
of grading equipment and vehicles, and equipment warm up
shall be limited to the hours of 7: 00 a.m. to 7: 00 p.m. ,
Monday through Saturday.
10. All grading and construction equipment will be stored on the
project site.
11. Equipment maintenance (refueling, oil-changes, etc. ) areas
will be restricted to areas designated in consultation with
the City prior to construction and grading activities.
12 . All grading equipment, fixed or mobile, shall be equipped
with properly operating and maintained mufflers. Any
stationary on-site noise sources such as compressors,
generators, or power saws shall be equipped with hospital
grade mufflers for engine driven sources, or shall be
surrounded by a temporary plywood enclosure as a noise
baffle.
13 . Stockpiling and/or vehicle staging areas shall be designated
on the project site and shall not be located on Forrestal
Drive or any public street. These staging areas shall be
located as far as practical from existing residential
dwellings.
14 . Fugitive dust generation during cleaning, grading, earth
moving, or excavation shall be controlled by regular
watering, paving of construction roads, or other dust
preventative measures in accordance with SCAQMD Rule 403 .
15. Construction activities will be temporarily halted on -high
ozone days or during second stage smog alerts at the
direction of the Director of Environmental Services.
16. To ensure public safety and to secure the site during
construction, the Developer shall submit a fencing plan for
approval to the Director of Environmental Services. Said
plan shall replace and/or provide fencing at the top of the
slope, adjacent to Forrestal Drive, in and around the
Portuguese Bend fields, park, and adjoining slopes.
Further, fencing shall be erected around the perimeter of
the playing field at the Ladera Linda Community Center.
17 . Noncompliance with the above grading and construction
restrictions shall be grounds to stop work immediately on
the property.
Exhibit "A"
Page 5
Resolution No. 92-121
D. HYDROLOGY AND DRAINAGE
I II AND
ill�11l,lI 1 I f �!�
1. All proposed cut and fill slopes shall be landscaped and
irrigated, wherever possible, to reduce potential erosion.
To reduce the potential for nuisance water from over
irrigation and to revegetate the unirrigated slopes, drought
tolerant vegetation shall be used for landscaping purposes.
Where feasible, drought tolerant plantings of the local
origin coastal sage scrub community shall be used. All re-
vegetation shall be subject to approval by the Director of
Environmental Services.
2 . Impervious surface drains shall be installed to conduct
surface waters across all proposed cut and fill slopes.
These drains shall also reduce percolation to the
groundwater of Klondike Canyon. In addition, quarry bowl
surface drains shall be designed in a manner which allows
water to pond in a small catchment basin for wildlife in the
area. All surface drains shall be installed to the
satisfaction and approval of the Directors of Public Works
and Environmental Services.
3 . Measures will be taken to eliminate erosion downslope from
the grading areas. Temporary measures could include sand
bag, silt fences, and hay bales placed into drainage
devices. An erosion control plan shall be approved by the
city prior to issuance of Grading Permits.
4. The minimum width of the "rockfall catchment area" which
traverses the slope beneath the relatively steep portions of
the cut., shall be 23 feet with a minimum berm height of 4
feet. A 6-foot high rock protection fence shall be
constructed along the top of the berm to increase the
effective depth and width of the catchment area.
5. Vertical bench spacing of 54 feet on the slope above the
11rockfall catchment area" shall be constructed.
6. The 4-foot high berm structure and 6-foot high protection
fence which are. proposed as part of the "rockfall catchment
area" on the quarry slope shall be adequately screened from
view by planting and maintaining drought tolerant vegetation
along the downslope base of the berm structure.
Exhibit "A"
Page 6
Resolution No. 92-121
7. A "drainage/rockfall control bench" shall be constructed
along the first 50 feet bench tier at the transition between
the 3/4 : 1 and 1: 1 portions of the slope. A paved drainage
bench with a minimum width of 12 feet shall be required with
a 6-foot high rockfall control fence along the outboard edge
of the bench.
8 . A paved "drainage/maintenance access bench" with a minimum
width of 12 feet shall also be constructed along the second
50-foot bench tier, at the transition between 1: 1 and 1.5: 1
portions of the slope.
9. A paved drainage swale or small bench drain shall be
included along the edge of the Forrestal Drive pavement,
including the area behind the proposed retaining wall. A
brow ditch along the crest of the proposed cut is also
required with appropriate design measures where this drain
intersects natural drainage courses.
10. Eventual undermining of the "drainage/maintenance access
bench" at the top of the 1: 1 slope will likely require
additional remediation and/or repair in the future. Four
general options have been outlined below to mitigate and/or
remediate areas of potential undermining. Based on further
evaluation by the City Engineer (for measure effectiveness,
maintenance impact, costs and aesthetic appeal) , at least
one of the following measures shall be implemented by the
developer or the Homeowners' Association, depending on who
is responsible for maintenance at that time:
A) Minimize erosion of the problematic intervals by
reducing the potential for cyclic wetting and drying; a
surface cover or membrane would be appropriate;
landscape planting supported by an anchored
geosynthetic grid is a possibility.
B) Minimize erosion by locally reducing the slope gradient
to an inclination at or below the "angle of repose. "
C) Set back portions of the bench drain likely to be
affected from the slope face and/or install a deepened
foundation along the outboard edge of the drain.
D) Provide remedial repairs to support the bench drain as
it becomes necessary; this option would likely include
provisions for local application of colored shotcrete
supported on anchors drilled or driven into the
bedrock.
Exhibit "A"
Page 7
Resolution No. 92-121
11, Accumulated soil and rock fragments shall be removed on a
frequent basis to maintain the drainage and rockfall control '
capacity of the benches. Desalting basins and similar
facilities which may be impacted by high sediment loads
during periods of heavy rainfall shall be periodically
checked and cleaned out. These maintenance requirements
shall be the developer's responsibility until such time as
the this responsibility is assumed by the Homeowners'
Association.
12 . All new drainage structures and protective fencing
proposed for the quarry slope shall be of an earth tone
color and shall be reviewed and approved by the
Director of Environmental Services*
13 , The ponding of water which occurs where a blocked
canyon stream meets the northern edge of the quarry
bowl, approximately 100 feet above the bowl floor,
shall be eliminated by directing the water through some
impermeable means to a controlled storm drain system.
All drainage devices shall be designed in an -
aesthetically pleasing and natural-looking manner and
in a manner which provides captured water to the
wildlife of the area. The developer shall submit a
plan which eliminates this drainage deficiency to the
Directors of Public Works and Environmental Services
for review and approval.
E. GEOLOGY
11 The three -multi-stage piezometers to monitor groundwater
conditions at the site, as required by previously approved
tract conditions of approval of Tentative Tract Map No.
37885 (GEOLOGY, No. 6) , shall be equipped so that they can
be converted into dewatering wells if the Director of Public
Works determines that the monitoring indicates a rise in the
water table.
2 . Prior to grading permit issuance, a grading plan for the
tract development, quarry slope cut, quarry slope fill and
quarry bowl fill shall meet all of the geotechnical
conditions of approval contained below and stipulated by the
City's Consulting Geologist, Any variations to the approved
geotechnical conditions contained below shall require
approval from the City's geotechnical consultant. If any
geotechnical conditions of approval cannot be satisfied by
the developer and, as such, necessitate a major revision to
Exhibit "All
Page 8
Resolution No, 92-121
the approved grading quantities or methods, a revision to
Grading Application No. 1390 shall be subject to approval by
the Planning Commission. The specific geotechnical
conditions for the grading project are as follows:
Al Residential Development
1) All recommendations of the consultant, except as
modified herein, shall be incorporated into the design
and construction. Recommendations for Tensar Geogrids
are excluded.
a. All cuts into "mudf low" deposits shall be
inspected by the consultant, the City geologists
and geotechnical engineer to determine whether or
not shear planes are present. If no shear planes
are encountered, then work may proceed per the
.consultant's recommendations. If shear planes are
encountered, then all "mudflow" deposits shall be
removed and replaced as an engineered fill.
b. The recommended monitoring wells shall be
incorporated into designs.
C. Any geogrid reinforcement shall be designed
to the satisfaction of the City's
geotechnical consultant and City Engineer.
2) The. consultant shall review and approve the final plans
and specifications by manual signature.
3) Before permits for grading may be issued, the
consultant shall issue a statement, in accordance with
Code Section 311 of the most current UBC adopted by the
City, which requires that every report shall contain a
finding regarding the safety of the site for the
proposed structure or use against hazard from any
variety of landsliding or settlement or slippage and a
finding regarding the effect of the proposed building,
grading, construction, and use of the site will have on
the geological geolo ical stability of property outside the site.
4) The consultant shall continuously inspect and monitor
all grading and test all fills placed. An as-graded
soils and geologic report, complete with fill and
compaction test locations, and geologic map,
based upon continuous geologic mapping of key
and fill bottoms, and cut exposes shall be
submitted and reviewed by the City's
Exhibit "A"
Page 9
Resolution No. 92-121
geotechnical engineer, prior to issuance of a
building permit for any structures founded in
said fill or prior to issuance of the
certificate of occupancy otherwise. The as-
graded report shall contain specific
recommendations:
a. The consultant recommends that more specific
evaluations of proposed building footprints, with
regards to mitigation of large potential
differential settlements, be performed prior to
the start of grading. This shall be performed by
the consultant and submitted to the City for
approval.
b. Provisions for monitoring settlement as
recommended by the consultant shall be performed.
5) Foundations and floor slabs cast on expansive soils
shall be designed in accordance with the consultant's -
recommendations and conform to the minimum requirements
of the Code and the City's guidelines.
6) Foundations shall be set back from descending slopes in
accordance with the consultant requirements. Minimum
foundation setbacks shall be determined in accordance
with the expression H/3+5, where H is the height of the
slope, measured in feet, The setback distance shall be
measured horizontally from the top or face of the slope
and need not exceed a distance of 25 feet. Foundations
shall extend to such a depth as to be unaffected by any
creep prone surf ficial soil and/or weathered bedrock.
Field inspection and approval by the consultant(s) is
required.
7) Construction of underground utilities shall be
performed in accordance with accepted standards and
subject to additional standards deemed necessary by the
Director of Public Works and/or Building Official to
avoid potential underground leakage. Additional
standards shall include, but are not limited
to, additional evaluations of settlement
potential.
Exhibit "A"
Page 10
Resolution No. 92-121
8) Additional subdrainage facilities shall be installed at
an intermediate level within the deeper fill as
additional protection against potential deleterious
effects of migrating groundwater. The type, number,
and location of subdrainage facilities shall be
approved by the City's geotechnical consultant.
B� Quarry Bowl
1) All of the recommendations of the consultant, except as
modified herein, shall be incorporated into the design
and construction.
2) The consultant shall review and approve the final plans
and specifications by manual signature.
3) Where fills are to be placed, including trench and
retaining wall backfills, an as-graded soils and
geologic report, complete with fill and compaction test
locations, and geologic map, based upon continuous
geologic mapping of key and fill bottoms shall be
submitted and reviewed by the City's geotechnical
engineer prior to issuance of a building permit for any
structures founded in said fill or prior to issuance of
the certificate of occupancy otherwise.
4) Where fill is placed at less than the Code required
degree of compaction (90a) the consultant shall take
sufficient tests to determine that the fill will have
acceptable strength and settlement characteristics. No
less than one direct shear test shall be performed and
submitted for every eight feet of vertical lift.
5) Access to the quarry bowl area following completion of
grading shall be restricted to authorized personnel
maintaining planned drainage installations or any other
City authorized personnel.
6) For the purpose of restricting non-authorized personnel
from entering the quarry bowl, suitable fencing
establishing a 50-foot wide buffer zone away from the
top of the quarry bowl walls shall be installed. In
addition, signage and a vehicular barricade shall be
established at the entrance to the quarry bowl to
restrict non-authorized personnel from entering the
bowl. Signs shall restrict access to the bowl, warn of
the rockfall hazard which exists and identify the area
as a protected ecological area. The exact wording of
the warning signs shall be approved by the Director of
Exhibit "A"
Page 11
Resolution No. 92-121
Environmental Services. All fencing and signage shall
be installed immediately after all remedial grading
activity has been completed in the bowl to the
satisfaction of the Director of Environmental services.
7) Minor regrading of the landslide headscarp north of the
quarry bowl shall be implemented as recommended in the
previous Moore & Taber report for the quarry bowl area
dated October 31, 1990 to the satisfaction of the
City's geotechnical consultant.
8) The development of future surface drainage design plans
shall be coordinated with the City's geotechnical
consultant and Director of Public Works. The proposed
drainage design shall be reviewed and approved by the
City's geotechnical consultant and Director of Public
Works prior to issuance of the grading permit.
QuarX:y Slone
1) Before any approvals are granted for the development
area, the consultant shall clarify that no potential
failure surface with computed factors of safety less
than 1. 50 pass behind the geologic setback line in the
area of the proposed Forrestal Drive cul-de-sac.
2) Any geogrid reinforcement of the quarry slope
shall be designed to the satisfaction of the
City's geotechnical consultant and City Engineer.
3) All of the recommendations of the consultant, except as
modified herein, shall be incorporated into the design
and construction. An addendum clearly stating any
proposed deviations from Chapter 70 and justifying same
shall be submitted,
4) The consultant shall review and approve the final
plans and specifications by manual signature.
5) Where fills are to be placed, including trench and
retaining wall backfills, * an as-graded soils and
geologic report, complete with fill and compaction test
locations, and geologic map, based upon continuous
geologic mapping of key and fill bottoms shall be
submitted and reviewed prior to issuance of a building
permit for any structures founded in said fill or prior
to issuance of the certificate of occupancy otherwise,
Exhibit "All
Page 12
Resolution No. 92-121
6) Foundations and floor slabs cast on expansive soils
shall be designed in accordance with the consultant's
recommendations and conform to the minimum requirements
of the Code and the City's guidelines.
7) Geologic reconnaissance, documentation of the slope
performance and, as appropriate, development of
specific maintenance and/or repair recommendations by a
California Certified Engineering Geologist shall be
performed on an annual basis by the developer or
Homeowners' Association, whoever is responsible, for at
least five years following completion of construction.
The compiled information shall be summarized in a
report to be submitted for review and approval by the
City's geotechnical consultant. The necessity or
frequency of future geologic evaluations beyond the
fifth year shall be evaluated after submission of the
fifth report.
Fill Slope
1) Geogrid reinforcement of the slope face shall be
installed to enhance surficial stability to the
satisfaction of the City's geotechnical consultant
and City Engineer.
2) Small interceptor or brow ditch-type drains shall
be constructed along all fill/cut transitions
which traverse the slope face. A specific detail
for this portion of the slope design shall be
developed prior to finalizing the grading plans.
3) A similar interceptor drain along the transition
between the 1: 1 and 1. 5: 1 slope gradients near the
eastern end of the slope shall be installed; or,
alternatively, a more gradual transition shall be
constructed.
4) A small area of 3/4 : 1 fill shown in the west-
central portion of the slope. The proposed
1.5: 1 fill slope in this area shall be
expanded as shown on Plate III of Moore &
Taber's report dated March 27, 1992, and
approved by the City's geotechnical
consultant.
Exhibit "A"
Page 13
Resolution No. 92-121
5) The retaining wall proposed at the toe of the fill
slope shall be designed to the satisfaction and
approval of the City's geotechnical consultant and
City Engineer.
6) A surface drain shall be constructed along the
back of the proposed retaining wall at the toe of
the planned fill slope (along the northern edge of
Forrestal Drive) .
7) The existing storm drain and collection basin
shall be extended through the area of the proposed
fill 'slope, at the easterly end of the quarry
slope.
8) Surface drainage conditions and requirements shall
be evaluated and approved by the City's engineer
prior to the issuance of a grading permit,
9) Prior to the issuance of a grading permit, a
thorough geotechnical evaluation of the proposed
fill slope shall be conducted, reviewed and
approved by the City's geotechnical consultant.
F. BIOLOGICAL RESOURCES
11 Prior to any project-related development activity, including
any vegetation clearing, on the project site, the Crossosoma
californicum shall be marked, fenced, and shall be carefully
avoided during all grading activity. Although it is not on
any rare or endangered species list, this plant is protected
by the City as it is the only recorded mainland species.
2 . If, prior to or during grading, vegetation clearing, or
other project-related activities, it is discovered that
additional Crossosoma californicum plants exist on the site
which have not been previously identified, all such
activities will be halted, and the City notified, Any new
Crossosoma californicum plants shall be marked and carefully
avoided or transplanted to a safe location and preserved on
the site,
3 . Prior to any project-related development activity,
including vegetation clearing, on the project site, a
qualified biologist will set up markers around the
Astragalus plants, These markers will consist of
visible stakes and ribbons completely surrounding the
individual Astragalus plants, as described and mapped
in the EIR Addendum*
Exhibit "All
Page 14
Resolution No, 92-121
4 . Prior to any grading or other project-related development
activity on the project site, including vegetation clearing,
a five-foot chain link fence will be constructed surrounding
each of these Astragalus plants to establish conserved areas
around each plant (the "Conserved Areas") . A qualified
biologist will be present during the identification of
fence locations so as to include individual plants that
may be overlooked.
5. The Conserved Areas will be visibly marked both by markers
and signs. The signs will indicate that they are strictly
conserved areas, and are not to be disturbed. The grading,
vegetation clearing, and other project-related development
activities will be designed to avoid any contact with or
disruption of these Conserved Areas.
6. All workers involved in project-related activities,
including vegetation clearing, will be informed of the
existence and location of the Conserved Areas and the
conserved Astragalus plants. All workers not specifically
involved in the setting up of the Conserved Areas or the
examination of the Astragalus will be given specific
instructions to avoid any contact with the Conserved
Areas.
7 . If a Conserved Area is accidently disturbed by grading
and/or other development activities, the area around each
Astragalus will be "sifted" by a qualified Lepidopterist to
determine whether any Palos Verdes Blue Butterfly (PVBB)
pupae are present and to remove them from the substrate
without damage. To mitigate the anticipated ated loss of the
PVBB foodplant during the sifting process, 200 Astragalus
seedlings will be established in appropriate coastal sage
sites close by, but clearly beyond the range of any
development activity. Seeds for the restock will be
provided from on-site individuals. These seedlings will be
irrigated for a period of one year to assure their
persistence. If PVBB pupae are found, the U.S. Fish and
Wildlife Service (USFWS) will be contacted and no further
actions which affect the plant area will be taken without
consultation with the USFWS.
8. If prior to or during grading, it is discovered that
additional Astragalus plants exist on the site which have
not previously been identified, a procedure will be
established to notify a supervising project operator, and
all grading and/or project-related activities will be
brought to a halt until implementation of one of the
following contingency measures:
Exhibit "A"
Page 15
Resolution No. 92-121
A) Establishment of an additional Conserved Area for the
newly discovered Astragaluse
B) Sifting of the Astragalus to determine if PVBB pupae
are present* If it is determined that no pupae are
present, an attempt will be made to transplant the
analyzed plant to an appropriate site designated by the
USFWSe
91 If a PVBB is sighted at any time, the USFWS will be
contacted immediately and no further actions which affect
the project site will be taken without direct consultation
with the Service.
10, Should additional plants be located and subsequently lost,
they will be replaced at the ratio of 50: 1. Monitoring will
guarantee persistence of 50 percent of the plants set
out after two years.
11. Fuel modification plans shall be implemented to avoid
additional impacts to the coastal sage scrub habitat.
A) The feasibility of incorporating fire sprinklers within
individual homes will be investigated with the County
Fire Marshall as an option to vegetation clearing*
B) If necessary, periodic irrigation of existing and
restored coastal sage scrub adjacent to development
areas will be permitted to maintain vegetation moisture
levels and to reduce fuel load.
12 . Prior to any grading or vegetation clearing of any portion
of the site, a directed survey shall be conducted to locate
on-site nests of California gnatcatchers. If eggs or young
birds are found, the U.S. Fish and Wildlife Service shall be
contacted prior to any grading or disturbance of habitat.
If gnatcatcher nests are present, no grading, vegetation
clearing, or removal of habitat will take place within 500
feet of known nesting sites during the nesting/breeding
season (March I through June 30) , If nests, eggs or young
birds are found and need to be removed, they shall be
removed in compliance with the Federal Migratory Bird Treaty
Act.
13 , During vegetation clearing or grading, all areas of coastal
sage scrub to be avoided shall be protected through the
construction of temporary fencing* No construction access,
parking or storage will be permitted within the fenced
areas. Vehicle transportation routes between cut-and-fill
Exhibit "All
Page 16
Resolution No. 92-121
locations will be restricted to a minimum number. Vehicle
transportation routes shall be restored to create high-
quality gnatcatcher habitat following construction.
14. Direct impacts to 11.3 acres of quality coastal sage scrub
shall be mitigated by replacement of 23 .8 acres of coastal
sage scrub habitat within graded cut-and-fill areas
elsewhere on the project site (2: 1 areal replacement) .
Habitat .replacement will be initiated concurrent with
project impacts, subject to approval by the Director of
Environmental Services.
A) Replacement shall take place in three locations on the
project site: 1) on the south-facing slopes directly
adjacent to the development area (2 .5 acres) ; 2) on the
south-facing cut-and-fill slope on the northern side of
Forrestal Drive (12.8 acres) ; and 3) on the haul road
and f ill area in the eastern quarry bowl (8. 5 acres) .
15. Direct impacts to 19.7 acres of disturbed coastal sage
scrub/California gnatcatcher habitat shall be mitigated
through the enhancement of the 20. 5 acres of degraded
coastal sage scrub within the designated habitat
preservation area (1: 1 areal enhancement) , subject to
approval by the Director of Environmental Services.
A) Coastal sage scrub/California gnatcatcher habitat
enhancement shall take place in the 20. 5 acres of
presently degraded coastal sage scrub habitat in the
eastern portion of the project area. Enhancement will
include:
1) the removal of existing non-native
invasive species such as ice plant
(Carpobrotus edulis) , pampas grass
(Cortaderia atacamensis) and
mustards (Brassica s.p.p. ) ;
2) the removal of human disturbances
(off-road vehicle use) ;
3) the de-compaction of disturbed soils;
4) the re-introduction of appropriate coastal
sage scrub species by seed and by container;
and
5) the construction of protective fencing around
the perimeter of the habitat preservation
Exhibit "A"
Page 17
Resolution No. 92-121
area. Habitat enhancement will be initiated
prior to or concurrent with project impacts.
16. Revegetation of the remedial grading areas shall be
performed by the Developer using seeds or nursery-grown
plants, preferably with seeds, other propagules, or
transplants from this property consisting of plants of the
local origin coastal sage scrub community, subject to
approval by the Director of Environmental Services*
17 . Irrigation systems will be installed and maintained by the
project developer until the Director of Environmental
Services is satisfied that the replacement vegetation
required through these conditions is established.
18. A bond in an amount to be determined by the Director of
Environmental Services will be posted by the developer to
assure adequate establishment of the vegetation,
19. A qualified biologist shall be present on-site during all
remedial grading activity, including vegetation clearing, in
the quarry bowl to ensure that all identified plants are
protected and conserved pursuant to the conditions outlined
above,
20. All coastal sage scrub replacement/enhancement efforts will
be monitored by a qualified biologist for a period of five
years following implementation* At that time, a program for
the longterm preservation of preserved and restored coastal
sage scrub habitat shall be submitted to the California
Department of Fish and Game, the U.S. Fish and Wildlife
Service, and the Director of Environmental Services for
review and approval.
Go TRAILS
11 The Developer shall adhere to previously approved Conditions
of Approval of Conditional Use Permit No, 79 - Second
Revision as described in city council Resolution 89-109 ,
Particularly, Condition No. X states that construction of
the public trails shall be the obligation of the developer.
Construction shall coincide with the project grading
activity. and shall be completed upon certification of rough
grading. Dedication of the public trails shall occur at the
time the final map is recorded,
20 ' All trails shall avoid restricted access areas. These areas
shall be fenced off and identified through adequate signage
Exhibit "All
Page 18
Resolution No. 92-121
to be provided by the developer after review and approval of
the Director of Environmental Services.
H. ARCHAEOLOGYIPALEONTOLOGY
1. Grading and clearing operations and construction of
infrastructure improvements shall be monitored on-site by a
qualified archaeologist and paleontologist.
2 . Any significant specimens recovered will be donated to the
City or other appropriate public repository for future use
or display.
I. MITIGATION MONITORING
1. The Mitigation Reporting and Monitoring Program described in
attached Appendix "A" shall be implemented by the Developer
in cooperation with and under the review of the Director of
Environmental Services.
2 . All costs associated with implementation of the Mitigation
Reporting and Monitoring Program shall be the responsibility
of the Developer.
3 . No project-related activity, including vegetation clearing,
shall occur on the site until an environmental monitor is
hired as a consultant to the City for implementation of the
approved mitigation monitoring program.
jhr2:GR1390.con
Exhibit "All
Page 19
Resolution No. 92-121