HomeMy WebLinkAboutCDP 02-24X1; ST. CLAIRE RESIDENCE EXTENSION; HABITAT RESTORATION/ENHANCEMENT PLAN; 2005-04-15LAND USFICOASTAL PLANNING I PLANNING I I LANDSCAPE ARCHiTECTURE • LA3900 I I POLICY AND PROCESSING I I SYSTEMS ENVIRONMENTAL MflGATION
I
I
II
Ii
Kealy Property
I
Habitat Restoration/Enhancement Plan
11
I I -PROVED
I
April 15, 2005
I
I
Prepared for:
Patrick Kealy Construction
936 Monterey Boulevard
Hermosa Beach, California 90254
Prepared by:
PLANNING SYSTEMS
1530 Faraday Avenue
Carlsbad, CA 92008
I
I
I
Ii
I
ii
I
11
I
1530 FARADAY AVENUE • SUITE 100 • CARLSBAD, CA 92008 • (760) 931-0780 • FAX (760) 931-5744 info@planniugsystems.net
Table of Contents
1.0 Introduction 1
2.0 Restoration/Enhancement of Coastal Sage Scrub Habitat 3
3.0 Enhancement Methodology 5
4.0 Post Installation Exotic Species Control 10
5.0 Maintenance and Monitoring 11
6.0 Personnel 12
7.0 References 14
Appendix A - Mitigation Monitoring Contract
1.0 Introduction
The Kealy parcel is an undeveloped 0.57 acre property proposed for construction of a
single family residence. The parcel is located at 4588 Adams Avenue in Carlsbad,
California (Figure 1). The parcel is also identified as Assessor's Parcel Number (APN)
206-192-38 in the County of San Diego.
The project impacts natural habitat occurring on the site and thus requires
implementation of biological mitigation measures to reduce the level of significance of
these impacts. The Biological Survey of the property indicates that the habitat type
impacted is Diegan coastal sage scrub. The City of Carlsbad has required onsite
enhancement of 0.24 acres of coastal sage scrub habitat and payment of fees
equivalent to purchase of another 0.24 acres of habitat as mitigation for this project.
The purpose of this plan is to locate the areas where onsite enhancement will occur
and to define the specific enhancement measure that will be implemented. This plan
I describes the revegetation and invasive species control activities that will be performed
as part of the enhancement effort. The plan specifically addresses habitat composition,
I plant installation procedures, exotic species control procedures, and maintenance
activities in the enhanced habitat areas.
1.1 Project Scope and Objectives
Project related impacts to natural vegetation will result from grading activity,
infrastructure improvements on-site, remedial grading during the construction phase,
and fuel modification zone establishment and maintenance.
This Natural Habitat Enhancement Program proposes:
1) Restoration and enhancement of coastal sage scrub habitat,
I 2) control of exotic species in all open space areas and created habitats,
3) maintenance of the habitat enhanced,
I
I
Mealy Enhancement Plan
1/31/co SM
eOM
CHANGES
20
BPS
s 333.
DETAIL "A'
NO SCALE
ILK OLD NEW1YP
@ /1
49/ 2 i' -7 78
Li 22 78
I/ /0 7'
-Yt
192 314 SMAI
19C 344 27-Z4 I
-
I ceai SPACE
-0 206-19
N
WEY U DR
_
/
Sd t..W / / 4PAR
35 PAR o 1/"1*i O.84 AC 47 PAR - 0.S3AC) /4 °A (3) PAR I 1P4R -
• s'0 4. r
•, 4 (3) 0.79A 4 36 oaz
o AC
+
051$C. I.IOAC /Qfu AC Ts I
/)! BLK E ° *% LOZC
- 10 •
AP WAS PPAQ ASSES9eff RjFpDSB OttY. NO hAStIlY is ED FOR RE ACCCT OF TM DATA Si-OWN. ASSESSORS PARCELS or caai WITH Loai. sumWSCt4 oR jiwc c)NqcEa
COUNTY ASSESSOR'S MAP 81< 206 PG 19
MAP 2152 - BELLAVISTA
ROS 13B83(4183
(t
—SEE DETPJLW
S
39, P
'tci544" #4 om Ac
J>
197
2.0 Restoration/Enhancement of Coastal Sage Scrub Habitat
The ultimate goal of this enhancement plan is to specify improvements which will
provide for an increase in habitat quality for the onsite plant communities that remain
after project construction. Figure 2 shows the areas that are proposed for
enhancement. Area lisa steep-sloped area that comprises 0.16 acres of disturbed
coastal sage scrub habitat. Area I does extend onto the adjacent properties and will
require written authorization from the property owners.
Area 2 comprises an area of 0.08 acres and again is located on an adjacent parcel.
The owner of this property (Mr. John St. Clair) is the former owner of the subject lot and
has previously agreed to allow enhancement of Area 2 and his portion of Area 1. Both
enhancement areas are located outside of the development envelope and the fire
management zone.
2.1 Restoration/Enhancement
Restoration/enhancement as used in this document is defined as the improvement of
existing natural habitat by elimination of the "disturbed" aspects of the plant community,
and establishing native species appropriate to that plant community.
Irrigation, where needed, will be installed on-grade, to establish natives in place of
weeds. Intensive weed eradication measures will be conducted until weeds are under
control, and new plantings can begin occupying the site successfully.
2.2 Coastal Sage Scrub Plant Community Composition Analysis
The composition of the habitat to be enhanced per this plan is based upon site visits
and assessment of adjacent habitat composition. Data from the scientific literature was
also reviewed to assist in developing the sage scrub plant palette. Finally, the
experience of Planning Systems staff in enhancing this plant community locally has
Keafy Enhancement Plan 3
•
-
0 50 100 200 FT
SCALE 1" = 100'
PS#041137 February 16, 2005
LAND USE COAST PLANNING LANDSCAI'E ARCHITECTURE LANNING LSYSTEMS D POUCY AND PROCESSING ENVIRONMENTAL MITIGATION
1530 FARADAY AVENUE SUITE lOG. CARLSBAD. CO 92008
(700) 931-0700 FAX (760) 931-5744
C')
Co
0
NORTH
been applied to assist in fine-tuning plant palettes and in specifying methodology to be
employed in the establishment of these habitats.
The ultimate purpose of conserving and enhancing coastal sage scrub habitat is to
provide habitat for the California gnatcatcher, a state and federal Threatened species.
Creating suitable habitat for this species requires the presence of specific plants and
favorable density of these plants within the habitat. The plant palette specified in Table
I was developed based on a synthesis of these data.
Table I - Dominant Species and Relative Abundance
Common Name Scientific Name Percent of
Mix
Shrubs
Coastal sagebrush Artemisia cafifomica 45
Black sage. Salvia mellifera 5
Laurel sumac Malosma laurina 5
Lemonadeberry Rhus integrifolia 6
California buckwheat Eriogonum fasciculatum 10
Deerweed Lotus scapadus 5
Coyote Brush Baccharis pilularis 5
Bush sunflower Encelia califomica 10
Ground Cover
Purple needlegrass Nassella pulchra 3
Foothill needlegrass Nass&Ia lepida 3
Plantago Plantago insularis 3
Ground cover was added to the plant palette to stabilize the soils on the steep slopes to
limit erosion once the non-native vegetation is removed. High value coastal sage scrub
habitat does support native grasses in the open spaces beneath the brush canopy.
3.0 Restoration/Enhancement Methodology
Two areas of disturbed coastal sage scrub totaling 0.24 acres exist in areas that will not
be impacted by development. The location of these areas is shown on Figure 1.
Enhancement will be conducted in these areas using the coastal sage scrub container
plants and seed mix.
I Kealy Enhancement Plan 5
Both areas support a variety of non-native species that will be removed as part of the
enhancement activity. Container plantings will be used to assure that the target species
composition is achieved in the enhancement areas. Seed mix will also be used to
achieve satisfactory coverage of the entire 0.24 acres. A temporary above-grade
irrigation system will be installed to assist seedling and container plant establishment.
3.1 Summary of Restoration/Enhancement Methodology
Restoration/Enhancement activities will be timed to assure that the plant materials will be
placed in the ground during the November to December time period to take advantage of
water availability during the rainy season. Disturbed upland habitat restoration will be
conducted as follows:
1) Stake project limits with baffler tape.
2) All non-native or weed species will be manually removed from the area.
3) Install above-grade irrigation using both spray and drip irrigation systems to
minimize erosion on the steep slope.
4) Break up soil crust and cultivate at least top three inches. Cycle irrigation until
runoff is observed..
5) Install containers and hand seed restoration areas.
6) Irrigate per recommendation of habitat enhancement manager.
3.2 Site Preparation
Site preparation in both enhancement areas will be conducted prior to installation of plant
materials. Scarification of the soil, weed eradication and erosion control are included in
site preparation. This activity will be conducted between September and October to
assure that the site is ready for planting in the November to December timeframe.
Kealy Enhancement Plan 6
3.2.1 Scarification
The final soil surface of all areas to be enhanced shall be left in a rough condition. The
intent is to reduce erosion by providing small ledges, cracks and crevices for seeds to
lodge. These depressions and ledges will provide shelter for small seedlings and
increase water infiltration, retention, and root penetration. Scarification will be
performed manually using, picks, hoes and rakes. This activity will be accomplished in
October to minimize the chance that early rains can erode the effect of scarification.
3.2.2 Erosion Control
Provide erosion control (hay or gravel bales) will be placed at the bottom of the steep
slope areas to minimize migration of soil from the de-weeded areas as indicated on the
engineers erosion control plans or as directed by the habitat program manager.
Erosion control activities will be in-place by mid-September and prior to the onset of
winters rains to minimize the potential for erosive movement of soil.
3.2.3 Weed Eradication
Weed eradication will be conducted as part of the site preparation activities. All weeds
and exotic species will be initially removed by manual means. Weed eradication efforts
will continue through three cycles of herbicide application and or manual removal
followed by grow-out. A cycle consists of watering the soil for the period of time to force
sprouting of weed seeds to a height of approximately 4" tall, followed by reapplication of
herbicide or hand removal. This activity will be conducted between September and
October
3.3 Coastal Sage Scrub Installation
Installation of a combination of container plants and application of seed mix are
proposed to provide the diversity of species that characterize high value coastal sage
scrub habitat Installation will be accomplished in the November to December
Kealy Enhancement Plan 7
timeframe as this maximizes the potential for winter rains to sprout and maintain the
plantings. The cool temperatures also minimize evaporative loss of water.
Species and planting rates are selected based upon a review of the literature and local
experience with these habitats. All of the species listed in the seed and container
planting lists were identified on site or are natives associated with the plant community.
The table below identifies the number of containers of each species that will be needed
to cover the 0.24 acre enhancement area based on the percentage of each species in
the palette and the average area that is occupied by the mature plant. All container
plants will be installed from 1 gallon size containers, with the exception of the needle
grass plants which will be installed from 2.5 inch liners. The entire area will be hydra-
seeded to assure adequate coverage of the enhancement area.
Table 2- Coastal Sage Scrub Revegetation Area Target Composition Schedule
Scientific Name Common name Percent Coverage per I Number of
Gallon Container Containers
Artemisia califomica Coastal sagebrush 25 32 ft' 55 Salvia rnelifera Black sage 10 32 fl? 24
Eriogonum fasciculatum California buckwheat 10 32 fl? 24 Rims integrifolla Lemonadebeny 15 64 fl? 36
Bacoharis pilularis Coyote brush 15 64 ft 36 Malosma laurina Laurel sumac 15 54 f? 36
Shrub Cover 85
Nassella pulchra Purple needle grass 5 3 tt per 2.5" liner 80 Nassel!a lepida Foothill needle grass 5 3 ft2 per 2.5" liner 80
Total Ground Cover 10
Table 3- Coastal Sage Scrub Seed Mix
Purity
(%)
Germination
Rate (%)
Application
Rate (lb./ac.)
Scientific Name Common name
15 50 3.0 Artemisia califomica Coastal sagebrush 2 40 1.5 Bacoharis pilularis Coyote brush 40 60 2.0 Encelia califomica Bush sunflower
10 65 2.0 Eriogorium fasciculatum California buckwheat
20 40 1.0 Isocorna venata Goldenbush
90 65 2.0 Isomeria artomus Bladderpod 90 60 tO Lotus scoparius Deerwed
70 60 1.5 Nasse!Ia pulchra Purple needle grass
I
I
I
[1
I Kealy Enhancement Plan 8
Purity
(%)
Germination
Rate (%)
Application
Rate (Ibdac..)
Scientific Name Common name
70 60 1.5 NasseIla lepida Foothill needle grass 98 75 20.0 Plantago insularis Plantago 85 50 1.5 Salvia mellifera Black sage
Total Lb./ac 37.0
Total LbI0.24 ac 8.8
3.4 Irrigation
Temporary above grade, overhead irrigation shall be installed in the enhancement
areas revegetation areas. Enhancement Area I shall be irrigated from temporary lines
running from the property above the enhancement area. It shall be the responsibility of
the enhancement area property owner to secure authorization for this system.
Enhancement Area 2 shall be irrigated from the subject property. Irrigation spray heads
and nozzles will be selected to match the size of each revegetation area, and shall be
adjusted so as not to over spray adjacent native vegetation. Check valves to prevent
low head drainage will be utilized throughout the revegetation areas.
Irrigation scheduling will be accomplished in consultation with the enhancement
program consultant. The schedule presented will be an approximate schedule for the
application of supplemental water. Adjustment will be required according to actual field
conditions, soil moisture, and weather. Application rates will be gradually reduced as
the plantings mature.
3.5 Planting
This section will serve as a guide for enhancement installation. Minor field modification
and flexibility must be incorporated into the implementation process to achieve the
desired goals. The actual placement and spacing of container plant materials shall be
done in a semi-random, drift type pattern, in the quantities and species specified. A
grid pattern shall be avoided. The distribution of adjacent, native vegetation shall be
Mealy Enhancement Plan 9
used as guideline for plant placement. These procedures shall be used when planting
container stock:
1. Dig plant holes to a depth of twice the plant container width.
2. Fill planting hole with water and allow to percolate into subsoil.
3. Add backfill soil to hole and place plant so that the top of root ball is 1" higher
than the surrounding soil surface.
4. Fill in around plant with soil.
5. Thoroughly water plants once again.
3.6 Manual Seeding
After irrigation installation, site preparation, and container installation has occurred,
manually broadcast seeding of the enhancement areas will take place. All seed mix
materials shall be applied in the quantities specified. The following method will be used
for hand seeding both enhancement areas. The soil surface will be broken up with hoe,
rake, or other suitable tool to a depth of at least 2". The seed mix will be amended with
1.5 cubic feet of fine grade sand prior to dispersal. The sand and seed must be
thoroughly mixed to ensure uniform integration and dispersal. Broadcast seeding shall
be performed only at times when winds are calm. Broadcast seeding shall consist of a
manual distribution of seed, followed by application of a slurry mixture of water, seed,
fertilizer, organic soil stabilizer and mulch. The slurry mixture shall contain:
Cellulose wood fiber 2000 lbs/acre
Organic Soil Stabilizer 160 lbs/acre (M-Binder or equivalent)
Gro-Power 100 lbs/acre
Agricultural gypsum 200 lbs/acre
All seed shall be delivered to the project site in sealed containers. All seed shall be
labeled according to state and federal laws. Each sealed container shall bear the seed
suppliers tags which shall indicate the container weight, seed type (genus and species),
seed purity, seed germination rate and date seed tested.
Kealy Enhancement Plan 10
I 4.0 Post-Installation Exotic Species Control
Both enhancement areas will require post-installation control of weeds and exotic
species to assure that weed species do not out-compete the native plants and thereby
hinder enhancement of the native plant communities.
In areas where intact habitat exists to be preserved, weed eradication must occur in
such as way as to not harm the existing desirable species. Manual weeding in which
individual weeds are pulled out by hand or seed heads are cut, bagged and removed
before maturation, represents the only effective method of weed management in this
category. It is possible that limited amounts of herbicides may be useful under certain
circumstances.
5.0 Maintenance and Monitoring
The success of the restoration/enhancement effort relies on diligent maintenance to
prevent growth of invasive species and reliable availability of irrigation water. An
ongoing monitoring effort is required to document the success of the restoration and
enhancement activities. This project will be monitored for five years following
installation or until the planting are off supplemental irrigation for a two year period.
5.1 Maintenance
The site will be maintained on a weekly basis during the first six months post installation
to assure that invasive species do not out compete the recently installed container
plants or prevent sprouting of the seed mix. Maintenance weeding will be done
manually. The other maintenance activity will be verification of irrigation system
function both in terms of water flow and coverage. Maintenance personnel will verify
that the system is operational and providing coverage to all planted areas.
Maintenance personnel will also be responsible for assuring that the irrigation is not
creating erosive movement of dirt on the steep slopes.
Kealy Enhancement Plan 11
After the first six months, maintenance visits will be reduced to a monthly basis unless
conditions warrant more frequent visits. The frequency of maintenance will be
determined by the habitat project manager.
5.2 Monitoring
Within six weeks of project installation, the restoration ecologist shall certify in writing
that the mitigation installation has been completed. A letter shall be submitted to the
City describing the as-built conditions of the mitigation area.
The restored/enhanced habitat shall be visited by the habitat project manager on a
monthly basis for the first year Says after installation. The purpose of these monthly
inspections Will be to monitor the functionality of the irrigation system, the initial survival
of the container plants and the successful sprouting of the seed mix. At the end of the
one year period the habitat manager shall assess the overall survival of the plantings.
Dead plants will be replaced to the original density specification. In the event that some
plants show slow growth the habitat manager shall recommend changes to the irrigation
program, additional fertilizer, or changes to the plant material. The results of the one
year post-installation inspection shall be documented in a letter report, complete with
Photographic support. The report shall also include recommendations for corrective
action if needed.
Once the initial installation and any corrective actions are implemented, monitoring will
be performed on a quarterly basis for the next five years. At the end of each year a
letter report documenting the results of the previous growing season will be submitted
to the city. The report will include photo documentation of the results.
6.0 PERSONNEL
Planning Systems biologist, Greg Evans, a licensed landscape architect (CA 3900) will
serve as the Habitat Manager for this project. Initial planting shall be performed under
I Keay Enhancement Plan 12
his supervision and he will perform the habitat monitoring activities for the duration of
the proiect.
The actual plant installation and construction of the irrigation system will be performed
by a qualified professional landscape company. Plant materials will be purchased from
the Tree of Life Nursery in San Juan Capistrano, California or Los Pilitas in Escondido,
California.
The applicant agrees to the condition that the restoration/enhancement activities shall
be supervised and monitored by a professional restoration ecologist or licensed
landscape architect.
Planning Systems is currently under contract with Kealy Construction to provide design
services for the restoration and enhancement activities. Planning Systems expects to
continue to provide consulting services through the installation and monitoring phases
of this project. However, until the restoration/enhancement plan is approved by the City
of Carlsbad and the scope of work is finalized it is not possible to enter into a contract
for provision of such services.
I Keay Enhancement Plan 13
7.0 References
Atwood, J. L., 1990, Status Review of the California Gnatcatcher (Polioptil a
california). Unpublished technical report, Manomet Bird Observatory, Manomet, MA.
79 pp.
Bossard, C.C., Randall, J.M., and Hoshovsky, M.C., Editors, 2000, Invasive Plants
of California Wildiands. University of California Press, Santa Rosa, CA. 360 pp.
Dale, N., 1986, Flowering Plants of the Santa Monica Mountains, Capra Press,
Santa Barbara, CA. pp. 236.
Hickman, J.C., Editor, 1993, The Jepson Manual, Higher Plants of California.
University of California, Berkeley, CA, pp. 1392.
Holland, R.F., 1986, Preliminary Description of the Terrestrial Natural Communities I of California, Unpublished technical report. State of California, The Resources
Agency, Department of Fish and Game, Natural History Division, Sacramento, CA.
Munz, P.A., 1974, A Flora of Southern California. University of California Press,
Berkeley, CA. pp. 1084
Sawyer, J.O. and Keeler-Wolf, T.,1995, A Manual of California Vegetation.
California Native Plant Society, Sacramento, CA. pp. 471.
S&S Seeds, Seed Selection Guide for Reclamation and Landscape. Carpenteria,
CA.
I Keay Enhancement Plan 14
APPENDIX A
MITIGATION MONITORING CONTRACT
I FROM : FAX 'C. :31e93740 Apr. 14 205 12:03°t1 P2
PPR-14-2 11:534 F)m:FtJtFI43 SYSTEMS ice 931 5744 Th:1310937Sa4e P:2'3
I.
I
I
Bnkgrond.
Techthcsl &rviccs Agreement
for Pnviska of Mi%*dot Mnitodag Savkca
at 4588 Abs A'vnue, Carlsbad, CaI%oraM
- 14 April 2005
u: J .-:j. !J.1mi..t.
• - y .,t ip: I : lbJj •IIF t-r
, IIIu$S0046
1
11
II
II
Scope of Work , Zko,
ççt
1. r - I S t.0 ,. t* j_ J. S p 54 13 I - 111111. ap cpugsI'.i.Sl's.
2. hvectim and •_,I :hIj$ IIb Pt;IIJLI
4. QuKtarly imvpwdon of the &e
5.
.,
a
additional four __
Prqwafim offive III k)I 1 'S
Schedak and Con
I
I
I
0
I
I
I
I 15$ FARADAY AflziJF • san lit • C4*SAD1 c. flat. (VEt) 931-nt • FAX (YEt) fl1-5744 p 'ar,.'—.att
FROM FAX NO. :3109373E4 cpr. 14 25 12:04Ft1 P3
U PFR-14-2005 11434 Ra1:PLIfl4ING SYSTEMS 760931 5744 TU:11e937a4g P:3'3
If the actMSs dezcdbcd above we accomplitedin &-wer hours Than eMbnàtsd, only actual cods wig be
invoiced
S;%r34 ¶4.\
vAR be pro-cided as necessary at emphn 15%. Invoice Payment is due 30 daya net Pf pmtymmy
Iaction, proc=ding or mbitration by the pmv&Wn.pmty-
•
Sø ;sj .;,j4:I II41Wjht
p
Task Dascilpdon mom Mss
CethLcaiono(lnMaLhta1r L. 8 $7BDO0 —
Monthly Site Iuspeclions (Year 1) 12 4 '$4,560.30
QwerFjSlkMspecxns(Yeor2-5) 18 4 $8,080.00
Prepaatbn of Annual Montstlg Rspails 5 5 85000
Five Year EStInSd Cost $18,530.00
II
II
II