HomeMy WebLinkAboutCT 13-03; Robertson Ranch West Village; PLANNING AREA 1 SOIL FILL-EROSION CONTROL REVEGETATION PROGRAM; 2016-07-19-------1
PLANNING AREA 1 SOIL FILL
EROSION CONTROL REVEGETATION PROGRAM
ROBERTSON RANCH WEST VILLAGE
JUN 0 8 2016
LAN MENT
G
Prepared for:
TOLL BROTHERS INC.
725 Town & Country Road
Suite 200
Orange, CA 92868
Prepare by:
PLANNING SYSTEMS
1530 Faraday Ave.
Suite 100
Carlsbad, CA 92008
May 19, 2016
PLANNING AREA 1 SOIL FILL
EROSION CONTROL REVEGETATION PROGRAM
ROBERTSON RANCH WEST VILLAGE
May 19,2016
1.0 BACKGROUND
This program is called the Planning Area 1 Soil Fill Erosion Control Revegetation Program
("Program"). This Program involves the installation of an erosion control revegetation project over
approximately 3.25 acres of a deposited permanent soil embankment in Planning Area 1 in the
western comer of the Robertson Ranch West Village (see Figure 1 -Location Map). The soil fill
revegetation site is located within Hardline Open Space currently supporting weedy, non-native fallow
agricultural land. The proposed project involves the import of soil onto the 3.25 acre site and
revegetation of the site with Diegan Coastal Sage Scrub ("DCSS") vegetation. This Program
describes the design, installation, maintenance, and monitoring work required of the Property Owner
("Toll Brothers Inc") to establish the revegetation.
This Program describes the methodologies for creating an erosion control planting ofDCSS habitat
similar to the biological character of other naturally occurring DCSS habitat in the area on Robertson
Ranch. It includes a planting design, installation methodology, a maintenance program, monitoring
procedures, success criteria, and ultimately a tum-over process to the Long Term Conservancy
Manager ("CNLM"). The term anticipated for achieving tum-over ready DCSS revegetation is three
years.
2.0 PROJECT RESPONSIBILITY
All activities indicated in this revegetation Program are the responsibility of Toll Brothers Inc,
including the installation, establishment, maintenance and monitoring of the created DCSS for the
period until success criteria is met.
Restoration Specialist. Supervision of the installation, maintenance, and monitoring of this
restoration project will be the responsibility of a restoration specialist ("RS "), hired by Toll Brothers
Inc. The RS will directly overseeing the planting, seeding, weeding, and maintenance. The RS will
provide regular monitoring reports that include lists of items in need of attention. If remediation is
needed the RS will propose work needed to establish revegetation that is likely to meet success
criteria. The restoration specialist will prepare and provide annual reports to Toll Brothers Inc and
CNLM. Contractors will install and maintain the revegetation under direction of the RS and in
accordance with this Program.
Installation Contractor. The installation contractor work includes: site preparation, soil preparation,
irrigation installation, container planting, hydroseeding, erosion control, and weed control. He will
also be responsible for all project maintenance during the 120-day establishment phase.
Maintenance Contractor. All maintenance following the initial establishment period will be
performed by a maintenance contractor. A minimum of two years and eight months of maintenance is
required for this project. Maintenance will include but not be limited to weed control, trash removal,
watering, fence repair, dead plant replacement, and re-seeding. All maintenance activities conducted
will be seasonally appropriate and considerate of the bird nesting season, and approved by the RS.
Figure 1
Location Map
PA 1 -Soil Stockpile Revegetation Area
Carlsbad, California
EB NORTH
0 125 250 500 1000
~I I
SCALE: 1" = 500'
IT~~Ei':~ I I •II
February 12, 2016
~&sW~ctt~#E[~ING POUCY .AND PROCESSING ENVIRONYENTAL W'l'JGATION
1530 FARADAY AVENUE. SUITE 100. CARlSBAD, CA ('760) 931-0780 F.AX (760) 93J-l'i744
EROSION CONTROL REVEGETATION PROGRAM
WEST VILLAGE PLANNING AREA 1 SOIL FILL
Conservancy [Long Term] Manager. Upon acceptance of the revegetation, responsibility for
permanent long term management of the revegetation areas will be transferred to CNLM, to manage
the revegetated land in an environmentally and biologically beneficial manner as per the management
of the adjacent natural habitat, in accordance with the requirements of the Robertson Ranch Open
Space Land Management Plan Addendum (Planning Systems 2014) and consistent with state and
federal environmental laws.
3.0 RESTORATION INSTALLATION
Implementation of this Program is expected to begin as soon as feasible upon completion of soil
import to final grade of the fill. Upon achieving fmal grade as shown in Figure 2; Grading Exhibit,
the perimeter of the revegetation area will be fenced in order to secure the area from outside
interference. Then in sequence: temporary irrigation installation, container planting, erosion control,
and hydroseeding will be performed. The entire restoration planting is anticipated to be complete
within 4 weeks of initiation ofthe effort. The restoration area is shown on Figure 3; Future
Biological Resources.
The steps associated with initial revegetation ofthe site are indicated in the following sections.
3.1 Fencing of Revegetation Area Limits
Permanent fencing of the Tamarack Avenue frontage at the northern property line with 3-strand wire
fencing shall be installed. In addition, temporary, orange environmental fencing shall be erected to
clearly demarcate the perimeter of the work zone.
3.2 Site Preparation
Soil samples shall be collected by the RS and submitted to a soils testing lab. A complete analysis of
each sample with recommendations will be provided to the RS. Particular attention shall be paid to
pesticides and herbicides and other hazardous materials. Soil amendments are expected to be
necessary. The RS will determine the fmal soil amendment schedule.
3.3 Erosion Control
Temporary silt fencing protection shall be installed along the perimeter of the revegetation plot. Straw
wattles will be utilized horizontally on the soil slopes to hold soil from eroding. If hay or gravel bales
are indicated for the revegetation area on the engineer's plans, these features shall be installed. A
cover crop applied via hydroseed will assist erosion control during the initial establishment period.
3.4 Irrigation Installation
An above-grade irrigation system with an automatic controller shall be installed to irrigate the
revegetation area. The installation contractor shall provide irrigation scheduling and adjustment
throughout the entire 120-day initial installation.
At the time that the revegetation has matured to the level that the RS determines that the revegetation
can sustain without irrigation, it shall be discontinued. The target date for cessation of irrigation is two
years after the date that the installation was deemed complete. If the plantings require additional
water, irrigation shall continue on those areas, for as long as necessary to achieve proper
establishment. Upon completion of the monitoring phase of the project, above-grade components of
the irrigation system will be removed from the plots.
Erosion Control Revegetation Program
May 19,2016
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83 NORTH
Q 25 SQ 10o·0······2QQ ~·-' I Figure 2 SCALE: 1" = 100'
Grading Exhibit
PA 1 -Soil Stockpile Revegetation Area
February 12, 2016
'•II
Carlsbad, California 11~30 FARADAY AVENUE, SUITE 100, CARLSBAD, CA 92006 (760) 931-07EIO FAX (760) 931-5'1'44
LEGEND
CJ EXTENSIVE AGRICULTURE
[II! NON-NATIVE VEGETATION
I. ·!I SOUTHERN WILLOW SCRUB
lfl{~l DEVELOPED (FUTURE)
!:;; 'j COASTAL VALLEY FRESHWATER
MARSH
f> ,.J COASTAL SAGE SCRUB-
REVEGETATED
~ SOUTHERN WILLOW SCRUB-
REVEGETATED
1. O'day Consultants -Grading Exhibit (November 13, 2015)
2. Merkel & Associates-'Biological Resources Report' (October 5, 2004)
3. Glen Lukes Assoc. -Updated biology for Drainage 'A' vicinity (2011)
4. Planning Systems-'Rancho Costera DCSS Revegetation Plan' (August 6, 2014)
Figure 3
Future Biological Resources
PA 1 -Soil Stockpile Revegetation Area
Carlsbad, California
EE 25 50 100
NORTH
SCALE: 1" = 100'
February 12, 2016
1530 FARADAY AVENUE, SUITE 100, CARLSBAD, CA
(760} 931-0760 FAX (760) 931-5744
EROSION CONTROL REVEGETATION PROGRAM
WEST VILLAGE PLANNING AREA 1 SOIL FILL
3.5 Container Planting
The approved container planting palette (plant species, size and number/acre) specified in Table 1.
Container plants shall be planted prior to hydroseeding.
Table 1· DCSS Container Plant List
Qty. Qty.per .I<. LaiinName . ··:: Common Name Siie Spacing
(3.25 i l2700sf I .... acres)·.· ........ •·· cell • .. .
312 6 Artemesia californica Coastal sagebrush 1 gal 10ft.
208 4 California encelia Califomica encelia 1 gal 10ft.
208 4 Erio;;onum fasciculatum Flat-top buckwheat 1 gal 10ft.
208 4 Malosma laurina Laurel sumac 1 gal 10ft.
208 4 Rhus inte;;ri(olia Lemonade berry 1 gal 10ft.
312 6 Salvia mell!fera Black sage 1 gal 10ft.
1,456 28 TOTAL
3.6 Hydroseed Installation
Hydroseeding will follow container planting. The approved seed mix (plant species and pounds/acre)
are shown on Table 2. Hydroseeding shall consist of a hydraulic application of a DCSS native seed
mix plus a slurry mixture of water, seed, fertilizer, organic soil stabilizer and mulch (Hydroseed Slurry
#1, below). All will be applied in a one-step application.
2 0.10
3 1.0 Encelia califomica
4 0.75 Erio onum fasciculatum var. fasciculatum
5 0.25 Deinandra fasciculata
6 1.0 Eschscholzia califomica
7 0.15
8 1.0
9 3.0
10 0.75
11 6.0
Hydroseed Slurry #1
Irrigated Coastal Sage Scrub (3.25 acres total)
gtv.
2000 lbs/ac
700 lbs/ac
300 lbs/ ac
150 lbs/ac
30 lbs/ac
description
cellulose fiber
Hydro-post compost (available from S&S seeds)
6-2-4 Tri-C humate fertilizer
Guar gum soil stabilizer
Mycorrhizal inoculum
Erosion Control Revegetation Program
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Coast California buckwheat
6
''
3. 7 Offsite Domestic Plantings
EROSION CONTROL REVEGETATION PROGRAM
WEST VILLAGE PLANNING AREA 1 SOIL FILL
An approximate 30-foot wide section of City of Carlsbad ROW exists directly adjacent to Tamarack
Avenue. This area is presently vegetated with domestic plantings, (typically acacia and eucalyptus).
Areas of this ROW that are disturbed by the soil transport effort, including sidewalk, irrigation lines
and domestic vegetation, shall be replaced by Toll Brothers Inc. as follows:
• Curb, gutter and sidewall< shall be repaired as necessary to City standards;
• Irrigation lines shall be repaired or replaced as necessary (domestic planting shall be placed
on separate meter and lines from DCSS revegetation);
• Street trees shall be installed at 40-foot intervals within 10-feet of back of sidewalk; and
• DCSS container planting and hydroseeding per Sections 3.5 and 3.6 above shall be installed
within the remaining ROW beyond the 10-foot back of sidewalk location.
4.0 MAINTENANCE
The revegetation site shall be maintained regularly in order to achieve optimum growth. Maintenance
activities are indicated in the following sections. Toll Brothers Inc. shall be responsible for three (3)
years of maintenance in accordance with this Program.
4.1 Weed Control
Weeds that occur within the revegetation area will be targets for removal. All weeds listed by the
California Invasive Plant Council on List A-1 and List A-2 (www.cal-ipc.org) shall be aggressively
targeted for immediate removal when identified. Less threatening weeds will be controlled as time
and resources dictate, with the intent of removing all non-native species from the revegetation. All
methods of weed removal must be approved by the RS prior to being implemented by the contractor.
The goal of the revegetation project is to establish native habitat that is essentially weed-free.
4.2 Erosion Control
Repair of erosion rills on slopes is the contractor's responsibility. The contractor shall repair small
erosion problems as noticed, and not to allow them to become major problems. Erosion control
devices such as decomposed straw wattles shall be replaced as necessary. The contractor shall make
irrigation system repairs as needed.
4.3 Fertilizer
Fertilize will be applied only if directed by the RS.
4.4 Replacement of Vegetation
If it is determined that plants have died and remedial plantings are necessary, the RS shall provide a
written description of the necessary work to Toll Brothers Inc and the contractor. Re-hydroseeding
shall occur iflarge areas do not support seedlings (hand seeding may be allowed for small areas).
Container plants which are dead or unhealthy shall be replaced according to the adopted success
criteria. Replacement of missing or poorly performing plants will occur as directed by the RS.
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May 19,2016
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EROSION CONTROL REVEGETATION PROGRAM
WEST VILLAGE PLANNING AREA 1 SOIL FILL
5.0 MONITORING
The RS will monitoring the project from the first day of installation until the project is accepted by
CNLM. The monitoring term will be three years assuming the success criteria has been met.
5.1 Installation Monitoring
The RS will monitor habitat restoration installation activities, including site preparation and
installation of irrigation, plant, and seed material. Specifically, the RS will ensure the irrigation
system is installed correctly, monitor the installation of plants and seed material, conduct an
installation walk and prepare a punch list(s) as necessary to insure a complete, healthy installation, and
prepare a letter for Toll Brothers Inc and the contractor stating that the installation is complete and the
maintenance and monitoring period has begun.
5.2 Maintenance Monitoring
Following installation, the RS will monitor maintenance activities conducted by the maintenance
crews during the 32 month (3 years minus 120 day installation) maintenance and monitoring period.
During each monitoring visit, the RS will inspect the restoration area to ensure that the restoration
effort is progressing as planned and to identify any problems that may affect the effort. Monitoring
memos regarding plant establishment, irrigation, sediment control, etc. will be provided following
each inspection to the contractor and to Toll Brothers Inc. The contractor will be responsible for
repairs within their contracted scope of work.
5.3 Performance Monitoring
Performance monitoring is targeted to grow DCSS revegetation that complies with success criteria.
This monitoring shall also begin once the 120-day establishment period is complete. Monitoring
shall occur once every three months. Monitoring Notes will be provided to the contractor and to Toll
Brothers Inc to document every scheduled monitoring visit.
In order to adequately evaluate ongoing success, quantitative data will be collected at the Year 2 and
Year 3 anniversaries. California Native Plant Society data sampling protocols will be employed to
generate this data. Two hundred meters of randomly-selected line intercept transects will be measured
and located on a map each reporting year. This data will then be averaged to provide a composite
sample that will be compared to the success criteria. If the revegetated habitat does not meet success
criteria for that year, remedial measures shall be recommended to Toll Brothers Inc, and implemented
during the next growing season. Sampling will provide data on vegetative cover of CSS species,
percent cover of non-native species, and% bare soil. Consistent sampling techniques will be used
throughout the monitoring process to ensure accurate comparisons. Results will be included in reports
submitted to Toll Brothers Inc and to CNLM.
6.0 SUCCESS CRITERIA
The following success criteria (Table 3) will be used to assess whether the revegetation has
established satisfactorily, and is ready for long-term management. Three years of success criteria for
DCSS revegetation areas shall comply with the following success criteria:
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EROSION CONTROL REVEGETATION PROGRAM
WEST VILLAGE PLANNING AREA 1 SOIL FILL
Table 3: Success Criteria
120Da 100% survival of contractor installed container material.
list Year 85% survival of installed container material, unless their function and value has been
replaced by same species seed or natural recruitment
15% achievement absolute vegetative cover of native species
No Cal-IPC weeds present
J 2nd Year 30% achievement of absolute vegetative cover of native sQ_ecies
No Cal-IPC weeds present
Annual exotics shall not exceed 25% of measurable cover
I 3ro Year 50% achievement of absolute vegetative cover of native species
No Cal-IPC weeds present
Annual exotics shall not exceed 20% of measurable cover
By year-end, permanently discontinue irrigation, unless remediation is required.
6.1 Final Performance Monitoring
Final performance monitoring of the revegetation shall take place no sooner than three years after the
installation was installed. When the RS has determined that the revegetation has satisfied the Year 3
success criteria, the RS shall document the findings in a Final Report.
7.0 PROJECT ACCEPTANCE
The Final Report will be distributed to the Toll Brothers Inc and CNLM. Representatives of the two
parties will visit the site to confirm that all project criteria have been met. After visiting the
revegetation, CNLM shall notify the Toll Brothers Inc of acceptance ofthe revegetation, or detail
issues that CNLM believes should be resolved prior to taking over management of the site. If the site
is acceptable to both parties the Toll Brothers Inc shall authorize CNLM to begin all future
management activities of the revegetation.
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