HomeMy WebLinkAboutCT 02-14; Bressi Ranch Residential; Tentative Map (CT) (31)ft 100 La Mesa Blvd., Suite 150
La Mesa, CA 91941-6476
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fax (610) 462-0552
phone (619) 462-1515
RECEIVED 0£C 0 9 2002
December 6, 2002 LEN-16
Ms. Kristine Zortman
Lennar Homes of California
5780 Fleet Street, Suite 320
Carlsbad, California 92009
Subject: Bressi Ranch On-site Coastal Sage Scrub Mitigation
Dear Ms. Zortman:
This letter provides the specifications for on-site coastal sage scrub mitigation at
Bressi Ranch. This mitigation consists of salvaging the topsoil and shrub canopy
from coastal sage scrub habitat in development areas and redistributing it in
currently disturbed areas outside the project development footprint.
Bressi Ranch is located at the southeast corner of Palomar Airport Road and El
Camino Real in Carlsbad, California (Figures 1 and 2). Farming has disturbed
most of the ranch, although isolated stands of native and naturalized vegetation
remain.
Responsible Parties. Four entities will be necessary to complete this project,
including the project proponent, restoration biologist, grading contractor, and
landscape contractor. The project proponent, Lennar Homes of California, is
responsible for underwriting the mitigation program. The restoration biologist is
responsible for marking collection areas, overseeing the collection, site preparation
and reapplication in the mitigation areas, and the two-year maintenance program.
The grading contractor, who must be properly licensed and bonded, will collect
and redistribute the soil and vegetation. The landscape contractor shall maintain
the site in a weed-free state for two years. Neither of the contractors nor the
restoration biologist has been selected.
Schedule. Site preparation, vegetation and soil salvage and reapplication of
salvaged is best done in the late summer or fall, during which time soil salvage
and redistribution is best done because soil microorganisms are dormant and less
subject to destruction while being relocated. This work may be done during other
seasons, but it will not be as effective.
Site Preparation. The soil salvage deposition or mitigation areas should marked
by a licensed land surveyor. Edges of the mitigation area adjacent to native
habitat shall be enclosed by a four-foot tall orange plastic construction fence to
prevent unauthorized impacts. Any unnatural land forms (e.g., berms and eroded
gullies) should be recontoured to the satisfaction of the restorarion biologist.
Letter to Ms. Kristine Zortman
December 6, 2002
2 of 2
Salvage. A licensed land surveyor will mark the impact footprint through the
existing stands of coastal sage scrub, of which there are approximately 31 acres
available for salvage. Edges of the salvage areas adjacent to native habitat shall be
enclosed by a four-foot tall orange plastic construction fence to prevent
unauthorized impacts. The edges of the salvage areas adjacent to disturbed
habitat will be marked with stakes to ensure the collection of sage scrub soils only.
Next is the vegetation salvage and coarse mulching. The contractor can elect to
do this by one of two methods: scraping the vegetation up and processing it
through a mulcher, or crushing it in place by driving over it with a bulldozer and
then scraping it up. The mulch should be set aside, after which time the top six
inches of soil will be collected.
Reapplication. The salvaged soil should be applied directly to the mitigation area.
If storage is necessary, please contact me for storage specifications. Salvaged soils
shall be spread over the mitigation area at a depth of six inches. The topsoil will
then be ripped to a depth of 10 inches, which is a depth necessary to integrate the
salvaged soils into the mitigation site's surface. Following distribution and
ripping, the soil will be consolidated by track walking. After consolidation, the
vegetation mulch will be spread uniformly over the site. Finally, standard erosion
control measures (e.g., straw wattles, gravel bags, and hay bales) shall be installed
where necessary to minimize erosion until the vegetation becomes established.
Two-year Maintenance Period. The mitigation areas will be weeded six times over
the next two growing seasons. The tentative schedule for weeding is March, May,
and June. The actual timing of the weeding will be determined by the rainfall
pattern and subsequent plant growth in those years, as determined by the
restoration specialist.
Although these specifications call for 31 acres of soil salvage and reapplication, the
on-site mitigation requirement is only 25 acres. Thus, the two-year weeding
program will be required only for the 25 acres shown on Figure 3.
If you have any questions concerning this project, please call Barry Jones or me.
W. Larry Sxvafd
Senior Biologist
Enclosures: Figure 1 - Vicinity Map
Figure 2 — Location Map
Figure 3 - Coastal Sage Scrub Salvage and Mitigation Areas
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Regional Location Map
BRESSI RANCH
Figure 1
Optional Off-site
Improvement Area"
Scale: 1" = 2000'
Source: USGS 7.5 min Quadrangles; San Luis Rey, San Marcos, Encinitas, Rancho Santa Fe
HELIX
Project Vicinity
BRESSI RANCH
Figure 2
LEGEND
Coastal Sage Scrub Preserve Areas
d_J) Coastal Sage Scrub Salvage Areas
Coastal Sage Scrub Restoration Areas
On-site Coastal Sage Scrub Mitigation Area
Other On-site Vegetation
Indicates Area of Project Impacts
N
600 600
Job No: LEN-16 Date: 12/6/02
1200 Feet
Note:
This map is based on site conditions as observed at the time of our field
investigations. The information presented herein was developed by visual
inspection and/or aerial photograph interpretation. Note that both site
conditions and applicable regulatory requirements may change.
HELIX
Coastal Sage Scrub Mitigation Areas
BRESSI RANCH
Figure 3