HomeMy WebLinkAboutCT 99-08; Spyglass II; Tentative Map (CT) (31)Sent By: WILSON ENGINEERING; 7604380173; Oct-24-00 14:17; Page 1/8
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FAXMITTAL
TO: California Department of Fish & Game Date: 10/24/00 Time:.
ATTENTION; Terry Stewart PROJECT: Spyglass II Rc-vt
Carlsbad (CT 99-091
FAX: 858-467-4235 JOB #; L-1065
PHONE #: FROM: Robert C. Ladwie
TOTAL NO. OF SHEETS (INCLUDING THIS COVER SHEET): 8_
REMARKS: Terry,
Attached is the Re-Vcg Plan - sorry for the delay. I'll mail you a hard copy today. As we
discussed the last time, please send me the appropriate letter that would allow us to proceed
with the re-vegetation. Also, after you have read the plan, if you have any changes or
comments, please get back to me. Thanks for your help.
cc: Don Rideout, City of Carlsbad, 602-8559
Van Lynch, City of Carlsbad, 602-8559
Michael Ugar, Concordia Homes, 804-1577
tony Lawson, ADL Planning, 729-8324
703 Paloniar Airport Road • Suite 300 • Carlsbad • CA • 92009
(760) 438-3182 * FAX (760) 438-0173
Sent By: WILSON ENGINEERING; 7604380173; Oct-24-00 14:17; Page 2/8
Perennial Grassland Revegetation Plan
Spyglass Development Mitigation
Carlsbad, California
PSBS#T472B
Donor Site:
UTM: 3,670,OOOmN, 470,OOOmE
Receptor-Mitigation Site
UTM: 3,669,OOOmN, 473,OOOmE
Prepared for
Concordia Homes of California, LLC
7130 Avenida Encinas, Suite 200
Carlsbad CA 92009-4657
and
Ladwig Design Group, Inc.
703 Palomar Airport Road, Suite 300
Carlsbad CA 92009
Prepared by
Pacific Southwest Biological Services, Inc.
Post Office Box 985
National City CA 91951-0985
Telephone 619 477 5333
Facsimile 619 477 5380
E-mail: bio@psbs.com
! 23 October 2000
R. Mitchel Beauchamp, M. Sc., President
RECEIVED
LAOH16 DESIGN 6R '
Sent By: WILSON ENGINEERING; 7604380173; Oct-24-00 14:17; Page 3/8
Perennial Grassland Revegetation Plan
Spyglass Development Mitigation
Carlsbad, California
Introduction
The proposed development of an undeveloped site at the southeast corner of El
Camino Real and Carlsbad Village Drive (Elm Street), called Spyglass II (CT 99-08/SDP
99-04.SUP 99-04/ HDP 99-07) involves impacting a remnant Perennial Grassland by
landform alteration of the site. As mitigation for this three-acre impact to native
Perennial Grassland, the establishment of a 10.3-acre area of Perennial Grassland is
required to fulfill Condition 5 of the Mitigating Measures for the Spyglass II project.
This Plan details the procedures to establish that habitat in an area formerly
involved with agricultural use and now covered by weedy, non-native grasses and forbs.
The site is a portion of land owned by the State of California and administered by the
Departments of Transportation and Fi$h and Game as a mitigation bank and natural
preserve. The site lies northwest of another area proposed as a mitigation area, called
Holly Springs.
The site is suitable for restoration to Perennial Grassland by virtue of the
Altamont clay soils on the site and the proposed land uses nearby. The site lies between
80 and 200 feet in elevation and is generally a west to northwest facing slope system.
The lands to the south are owned by the Carlsbad Unified School District and presumable
will be developed as a school site. Having a natural preserve next to an educational
facility offers opportunities for educational and monitoring activities.
Methodology
The following steps are planned to result in the establishment and maintenance of
a native, perennial grassland cover for the site that will afford watershed protection,
reduce fuel loading, retain populations of grassland-associated native plants and provide a
prey base of rodents as foraging habitat for native raptors
Donor Site Salvage
The proposed development site has a substantial amount of salvageable plant
materials that are appropriate for transplantation to the receptor site. Prior to grading,
these materials, in the form of salvaged grass clumps, Dichondra clumps, and bulbs and
conns, will be salvaged by hand from the donor site and saved or directly replanted,
however the timing works out the sequence, at the receptor site.
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Fencing
The purpose of the fencing is to prohibit entry of motorcycles, which are currently
tunning unregulated in the area despite signs prohibiting such activity. A K-rail system is
proposed to create this barrier. This will allow foot access but preclude vehicular
entrance. It also will be useful if burning of the site can be achieved by permit for initial
weed eradication.
Removal of the non-native weeds
The present infestation of weeds can be controlled by initial herbicide use and
manual removal of the more localized weeds, such as Fennel (Foeniculum vulgare) and
Giant Artichoke (Cynara cardunculus). Burning is the method of choice since it allows
retention of vegetative ash, which serves as nutrient, as well as destroys the upper portion
of the weed seedbed. To this date, permission has not been granted by the Fire
Department to bum the site as a training exercise.
If burning cannot be used, selective solarization, using black plastic over irrigated
and germinated seedlings, will be done. The method to be used will be by cultivation of
the soil followed by limited irrigation of the site to germinate as many weed seeds as
possible. This treatment area will be covered with black plastic to let the accumulation of
heat from exposure to the sun kill the germinated seedlings. The treatment of each
covered area generally takes three to four days to germinate the seeds and kill with the
heat This, of course, assumes a suitable period of sunny days.
Following solarization treatment of the planting site, the salvaged plant materials
will be planted and the site over seeded by hand with the below cited seed mixture.
Minor Recontourin^of the Site
Minor portions of the site have been deformed in association with off-highway
vehicular use of the site. These will be reshaped using light earth moving equipment
Plant Materials
Plant materials to be used in the restoration are selected based on their presence in
similar adjacent habitats in the region, particularly at the development site, commercial
availability of seed, value to wildlife and successful use in previous rcvegetation projects.
Plant materials are to be salvaged or collected from native populations at the development
site is synchronization of the restoration site can be made prior to implementation of the
development No cultivars or ornamental selections are to be used in the revegetation.
Plant materials to be utilized are outlined below. The seeding weights per acre for each
species are given in the Table below. Seeding will be clustered to create a more natural
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plant assemblage and to take advantage of micro-site variations in soils, moisture and
exposure
PLANT MATERIALS PLANTING DENSITY (pounds per acre)
Aristidapvrpurea 2
Koeleria pyratnidata 3
Nassella lepida 1
Nassellapulchra 3
Vulpia myuros 3
insularis 3
Additionally, an annual mix of wild flowers will add biological diversity to the
grasslands. This mixture would custom spread within the grassland at only specific
locations to achieve an attractive visual element. These annuals include the following
species with the poundage rates only for purposes of mixture composition, not rates of
application per acre, since the material will be spot seeded for visual effect:
A Ilium peninsula Rae 0. 5
Allium praecox 0.5
Bloomer cntces 0.5
Calochortus splendens 0.5
Castilleja exserta 2
Dichehstemma capitatum 0.5
Eschscholzia californica 3
Gilia capitaia 2
Grindelia campo rum \ar.fractious 0.5
Hazardia squarrosa 1
hocoma menziesii 0.5
Lasthenia californica 3
Layiaptatyglossa 2
Linanthus dianthlflorus 0.5
Lupinus succulentus 5
Penstemon spectabilis 3
Sisyrinchium helium 1
Zygadenus fremontii 0.5
Several specialty species seedings will be made of rare or clay endemic if seed
can be obtained. These include San Diego Thornmint, Acanthomintha ilicifolia, and Clay
Morning-glory, Convolvulus simulans.
Several isolated shrubs occur on the site. These will be exploited as providing
microhabitats for transplantation of salvaged Western Ponyfoot, Dishonor occidental!*
that is to be also salvaged at the donor site.
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<<««**
Plant Establishment
The seed will be applied by hand seeding. Tf the soil surface has become sealed
over due to moisture or compaction, light raking or disking will be needed to prepare the
seed bed. Planting of salvaged plants of plugs will be planted about the site. Any death
of these salvaged materials will not compensated by replanting since no additional,
salvageable material will be available. Re-seeding will be the principal melhod of
establishing plant cover and diversity to achieve success criteria.
Irrigation
A temporary, field designed irrigation system is to be constructed in the restoration
area. This system will be installed above ground and will have 100% coverage and both
manual override and automatic controls. The irrigation system will be completely installed
and operable prior to commencing any planting. If solarization with black plastic is chosen
to remove weed seedlings, the irrigation system will be used to prc-irrigate the site so that
seeds will be induced into germination prior to solarization. The enhanced soil moisture is
the principal means of heat killing of the seedlings by solarization. The irrigation system is
to be operated for a period of 3 years or less if the revegetation specialist deems it possible
to remove the system and city and Fish and Game staff concur. Prior to the removal of the
system, its operations will be gradually phased out to avoid stressing newly established
young plants.
Maintenance
Maintenance of the restoration area will be carried out over a 3-year period
following the completion of all seeding and planting activities. Maintenance will consist of
weed and exotic plant control, plant replacement, control of vandalism, and irrigation.
Weed abatement on-site will be performed to control particularly noxious or
competitive species, which would inhibit the growth of desirable native vegetation.
Weeding will be performed as needed to reduce competitive shading or moisture loss over
the 3-years of the maintenance period. Exotic plants to be removed from the site will
include, but will not be limited to, Pampasgrass (Cortaderia jubata), Castor-bean (Ricinus
communis), Tree Tobacco (Nicoiiana glauca), Sweet Fennel (Foeniculum vvtgare),
Russian-thistle (Salsola tragus), Bristly Ox-Tongue (Picrts echioides), and Cocklebur
(Xanthiwn stnanarium). Other weedy plants, which might invade the site, will be removed
only if they pose a threat to the growth or survival of the target vegetation. Because of the
threat from Pampasgrass from adjacent sites, it may be necessary to pursue abatement of
this pest off-site with permission of the involved property owner.
Failed starts of seeded materials will be reseeded as necessary in order to achieve
the restoration goals or as prescribed by the monitoring program. Replacement planting
will utilize seeding only. Where micro-site characteristics are found to be more suitable for
growth of different plant materials, substitution may be made from other species on the list
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These substitutions are to be directed by the revegetation specialist.
The restoration sites will be posted with signs identifying the purpose of the area.
Trash dumping, ORV activity and damage to plants and irrigation systems will be
controlled by appropriate means. If necessary, sites will be further fenced to control
vandalism within the restoration areas.
Monitoring
The restoration site will be monitored for both successful plant growth and
biological functioning. Monitoring will be done in October of each year of the 3-year
monitoring period. During these monitoring periods, cover and frequency will be
determined by line intercept and quadrat sampling techniques.
During the monitoring periods, wildlife present at the sites will be inventoried to
assess the functional value of the restoration areas.
Establishment Success Criteria
Restoration will be considered successful if overall recruits from seed exceed 20
plants/meter after a 2-year period. After 3 years, the cover of native plant material should
exceed 50%. If restoration sites fail to achieve the minimum success criteria as specified,
restoration with container plants will be required to bring these areas up to the "success"
level. Monitoring reports will be prepared in October on an annual basis and submitted on
30 October of each year. Reports will be submitted to Carlsbad Planning Department and
California Department Fish and Game following client review.
Qualifications
All aspects of the restoration work, including planting, monitoring and maintenance
will be conducted by a qualified revegetation specialist with experience in native habitat
revegetation and possessing a valid C-27 Landscape Contractors license. A qualified
biologist with knowledge of local fauna will conduct wildlife monitoring. Work will be
funded by Concordia Homes of California, LLC. To ensure the successful completion of
all phases of the revegetation work, a performance bond has been posted with the City of
Carlsbad a part of the development site approval. Such security msy be released
incrementally as portions of the project are completed with the bond to be released at the
end of the 3-year monitoring period. The suggested increments for release of securities arc
as follows:
1. Completion of Planting Phase - This includes grading, installation of irrigation,
planting of salvaged plants and seeding of all restoration areas.
2. End of third year monitoring and maintenance period - This includes final
completion of all work and delivery of satisfactory to CDFG.
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