APPENDIXB Jurisdictional Delineation Memo

Memorandum

J:\27679000_SD Stormwater\TO-54 SW OM Support\FY 2013\014 Work in Progress\Task 08 - Gen. & LosPen Mitigation\Task 081 - Conceptual Mitigation Plan\PQ Conceptual Plan\Appendices - Same for both sites\Appendix B - JD\JD Memo 04-15-13.docx

Date: April 29, 2013 To: Mark Tucker From: Julie Stout and Sundeep Amin Subject: Jurisdictional Delineations for Proposed Mitigation Sites within

Los Peñasquitos Canyon Preserve The purpose of this memo is to document the methods and results of the delineation and jurisdictional determination conducted at two potential mitigation sites within Los Peñasquitos Canyon Preserve (Figures 1 and 2). The purpose of the delineation was to identify and map the location and extent of the limits of local, state, and federal jurisdictional waters of including wetlands that would fall under the jurisdiction of the U.S. Army Corps of Engineers (Corps), California Department of Fish and Wildlife (CDFW), Regional Water Quality Control Board (RWQCB), California Coastal Commission (CCC), and the City of San Diego. The current Arid West Regional Supplement and Rapanos/Carabell guidance (Rapanos) were applied to the methods and results of this study when relevant. This wetland study also evaluated the extent of waters of the State that may fall under the jurisdiction of the California Department of Fish and Wildlife pursuant to Section 1602 of the Fish and Game Code of California (Streambed Alteration Agreements) or the Porter-Cologne Act regulating waste discharge into waters of the State. This report is for use in the verification process with Local, State and Federal regulators and is intended to be submitted to the regulatory agencies for review and verification. Methods Site visits were conducted by URS biologists Julie Stout and Catherine MacGregor on April 4, 2013 and Julie Stout and Sundeep Amin on April 19, 2013. The initial site visits included vegetation mapping of the mitigation areas plus a 150-foot buffer and compilation of a plant species list. Areas with hydrophytic plant species were examined more closely to determine the wetland boundary. Initial delineation was conducted visually based on vegetation indicators. A three parameter wetland delineation was conducted in accordance with the 1987 Corps Manual and 2006 Arid West Supplement. Wetland waters of the U.S. were sampled using the general methodology detailed in the 1987 U.S. Army Corps of Engineers Wetland Delineation Manual (Corps Manual) for wetlands less than 5 acres in size. Sample points were chosen based on vegetation community mapping and considered visible transitions in vegetation composition and topographical changes. Additional soil pits were created to further document the wetland and upland conditions on site during the subsequent site visit and confirm wetland conditions in the southeastern corner of the site. The definition of the growing season and the basis of determining and recording indicators for hydrophytic vegetation, hydric soils, and wetland hydrology was the 2008 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (Arid West Supplement). Both the Corps Manual and Arid West Supplement were used for the determination and evaluation of any normal circumstances, atypical situations, and problem area wetlands. All Corps and CDFW jurisdictional areas were also assumed to be under the jurisdiction of the RWQCB and the CCC.

Page 2 of 2

J:\27679000_SD Stormwater\TO-54 SW OM Support\FY 2013\014 Work in Progress\Task 08 - Gen. & LosPen Mitigation\Task 081 - Conceptual Mitigation Plan\PQ Conceptual Plan\Appendices - Same for both sites\Appendix B - JD\JD Memo 04-15-13.docx

Results El Cuervo al Oeste-The western mitigation area included both upland and wetland areas within the current mitigation site boundary (Figure 1). Freshwater marsh and disturbed wetland overlapped the southwestern and southeastern portions of the proposed mitigation area. The riparian vegetation associated with Los Peñasquitos Creek is considered to be to be jurisdictional wetlands for all agencies. A summary of the delineation results and determinations El Cuervo al Oeste is provided in Table 1 below.

Table 1. Summary of Delineation Results and Jurisdictional Determinations for El Cuervo al Oeste

JDSP No. Hydrophytic Vegetation Hydric Soils Wetland Hydrology Jurisdictional

Wetland (Y/N)

1 - - - N 2 x x x Y 4 - N 5 x x x Y 6 x x x Y 7 - - - N

El Cuervo del Sur-The southern mitigation area included both upland and wetland areas (Figure 2). The site is surrounded to the North and West by riparian and wetland vegetation. A small patch of wetlands was mapped within the western boundary. This area meets the state definitions of wetlands and is assumed to be Corps jurisdictional under the PJD approach. A summary of the delineation results and determinations for the El Cuervo del Sur is provided in Table 2 below.

Table 2. Summary of Delineation Results and Jurisdictional Determinations for El Cuervo del Sur

JDSP No. Hydrophytic Vegetation Hydric Soils Wetland Hydrology Jurisdictional

Wetland (Y/N)

3 - - - N 8 x - - Y 4 - - - N

Recommendations It is recommended that the downstream boundary of both mitigation areas be revised to avoid wetland impacts. Suggested boundary revisions are shown on Figures 1 and 2.

!(

!(

!(

!(

!(

!(

AtF TuB

CkA

38El Cuervo NorteMitigation Site

JDSP 7

JDSP 6

JDSP 4

JDSP 5

JDSP 2

JDSP 1

Cottonwood Tree

Path

:G:\g

is\pr

ojec

ts\1

577\

2767

9051

\map

_doc

s\mxd

\PQ

_Can

yon_

Miti

gatio

n\JD

_Mem

o\El

Cue

rvoA

lOes

te_J

D_m

emo.

mxd

,pau

l_m

oren

o,5/

9/20

13,1

1:38

:33

AM

SOURCES: Site Boundary, Buffer, Vegetation, Utility Right of Way, JDSP, Boring (URS, 2013). Aerial Imagery (SanGIS, 2012). Soil (SSURGO, USDA, 2007).

JURISDICTIONAL DELINEATIONEL CUERVO AL OESTE

CITY OF SAN DIEGO

CREATED BY: LR

PM: BE PROJ. NO: 27679954.08300FIG. NO:

1SCALE: 1" = 90' (1:1,080)

45 0 45 90 Feet

OSCALE CORRECT WHEN PRINTED AT 11X17

DATE: 5/9/2013

Proposed Mitigation Site Boundary

Suggested Boundary Revision

100-Foot Buffer

El Cuervo Mitigation Site

!( Jurisdictional Delineation Sample Point

! A Boring Location

Soil Map LayerAtF, Altamont clay, 30 to 50 percent slopes

CkA, Chino silt loam, saline, 0 to 2 percent slopes

TuB, Tujunga sand, 0 to 5 percent slopesVegetation

Diegan Coastal Sage Scrub

Disturbed

Disturbed Wetland

Freshwater Marsh

Non-Native Grassland

Southern Willow Scrub

Jurisdictional Wetland (All Agencies)

!(

!(

!(

El Cuervo NorteMitigation Site

El Cuervo WetlandRevegetationMitigation Site

SbC

TuB

AtF

AtE

Not Impacted

JDSP 3

JDSP 8

JDSP 9

Eucalyptus

Palm Trees

Path

:G

:\gis

\pro

ject

s\1577\2

7679051\m

ap_docs

\mxd\P

Q_C

anyo

n_M

itig

ati

on\J

D_M

emo\E

lCuerv

oD

elSur_

JD_m

emo.m

xd,dia

na_sm

ith,10/2

4/2

013,10:3

1:3

1A

M

SOURCES: Site Boundary, Buffer, Vegetation, Utility Right of Way, JDSP, Boring (URS, 2013). Aerial Imagery (SanGIS, 2012).Soil (SSURGO, USDA, 2007).

JURISDICTIONAL DELINEATION

EL CUERVO DEL SUR

CITY OF SAN DIEGO

CREATED BY: LR

PM: BE PROJ. NO: 27679954.08300

45 0 45 90 Feet

ODATE: 10/24/2013

Proposed Mitigation Site Boundary

Suggested Boundary Revision

100-Foot Buffer

El Cuervo Mitigation Site

!( Jurisdictional Delineation Sample Point

Soil Map Layer

AtE, Altamont clay, 15 to 30 percent slopes

AtF, Altamont clay, 30 to 50 percent slopes

SbC, Salinas clay loam, 2 to 9 percent slopes

TuB, Tujunga sand, 0 to 5 percent slopes

Vegetation

Disturbed

Freshwater Marsh

Mulefat Scrub

Non-Native Grassland

Southern Willow Scrub

Jurisdictional Wetland (All Agencies)

SCALE: 1" = 90' (1:1,080)SCALE CORRECT WHEN PRINTED AT 11X17

FIG. NO:2

APPENDIXC Channel Cross-Section and Hydrology Memo

Date: A

To: S

From: T

Subject: L

MiSCwogd Thi Tswadv THb At TeFCcp Tgptft

April 19, 201

Sundeep Am

Thomas Gra

Los Penasq

Matt Mooren-house surSur sites. TCuervo al Owas taken objective to getting the depth of wat

The El Cuerheavily vegenstances sm

The El Cuersite area is with tall vegalignments adue to safetvegetated. S

The cross-sHowever, wboring locati

Attached is ataking waypo

The field suexisting topoFigure 2 anCity topogracanopy of thpoints.

The cross-seground pointpreliminary wthe 2-, 5-, 1for El Cuervothe FEMA F

J:\27679000_S

13

min

ace

uitos Field S

, Jerry Pitt rvey for Los

The survey wOeste site su

on April 18closely aligngeneral topter.

rvo al Oesteetated with tmall pools of

rvo del Sur smainly dry w

getation. Tand the watty. The thirSurvey point

section alige oriented oons, to give

a map illustroints with th

rvey points ography, 2-f

nd Figure 3 aphy is not he trees and

ections genet data for anwater surfac0-, and 25-yo del Oeste lood Insuran

SD Stormwater\TO-54

Survey Progr

and Tom s Penasquitowas taken wurvey was ta8th, 2013. n with the HEography of

e site surveythick brush f standing wa

site survey wwith tall gra

The vegetatiter appearedrd cross-sects were gath

nments weour alignmeus direction

rating our gee GPS unit o

were then tft contour infor El Cuervdetailed eno brush there

erated from n HEC-RAS ce elevationsyear floodplaand El Cuer

nce Study (F

SW OM Support\FY 2

ress Report

Grace speos Creek at ith three cro

aken on AprThe field sEC-RAS crothe land, w

y was conduand trees. ater were ob

was conducass, shrubs aon was tood to be deection, the mhered until ac

re hard to nts with vis

n.

eneral cross-on the field s

transposed ntervals, to gvo del Oesteough to capefore a field

the City topanalysis. T

s and flood ains were dervo del Sur,

FIS) for Los P

M

2013\014 Work in Prog

nt approximthe El Cue

oss-section aril 17th, 2013survey crossoss-section awe also note

ucted withinThe creek

bserved.

cted mainly wand trees. T

o dense to ep. We couost downstrccessibility w

establish ible landma

-section aligsurvey. Ref

onto the crogenerate a e and El Cupture the grosurvey was

ography andThe results fwidths for belineated. Rrespectively

Penasquitos

Memo

gress\Los Penasquito

mately 1.5 dervo al Oestealignments f3 and the Els-sections wand boring loed edge-of-

n the creek ahad running

within the prThe creek acomplete thldn’t travers

ream sectionwas limited.

based on arks, such a

nments thatfer to Figure

oss-sectionsmore define

uervo del Suound points conducted

d the field surom the ana

both project Refer to Figy. The flow s Creek.

orand

s\Los Pen Memo.docx

days condue and El Cufor each site Cuervo del

were taken ocations. O-water locat

area. The ag water and

roject site ararea was vehe survey ase through tn, was very

the overvies houses, t

t were estabe 1.

s generated ed section. ur, respectivs beneath thto suppleme

urveys werealysis determsites. For e

gure 4 and rates were b

dum

x\7-May-13\SDG

ucting an uervo del e. The El l Sur site with the ther than ions and

area was in some

rea. The ry dense

along the the creek y densely

ew map. rees and

lished by

with the Refer to

ely. The he dense ent those

e used as mined the each site, Figure 5 based on

! A

! A

! A

! A

! A

! A

!(

!(!(

!(

!(!(

!(!(

!(

!(

!(!(!(

!(

!(

!(

!(

!(!(

!(

!(!(

!(

PCA1

El Cuervo Westtest

1

2

34

5

67

5.1

3

5

10

2.4

2.5

3.03.1

3.2

B01

B02

B03

B04

B05

B06

Path

:G:\g

is\p

roje

cts\

1577

\276

7905

1\m

ap_d

ocs\

mxd

\Pen

asqu

itos\

LosP

enC

reek

_Sur

veyL

ocat

ions

.mxd

,lau

ren_

rizz

o,4/

19/2

013,

4:34

:00

PM

SOURCES: Survey Points, Borings,Cross Sections (URS, 2013). Aerial Imagery (Microsoft, 20100503).

SURVEY LOCATIONSLOS PEÑASQUITOS CREEK

CITY OF SAN DIEGO

CREATED BY: PM

PM: BE PROJ. NO: 27679954.08300

FIG. NO:1SCALE: 1" = 350' (1:4,200)

175 0 175 350 Feet

OSCALE CORRECT WHEN PRINTED AT 11X17

DATE: 4/19/2013

Legend!( Survey Location

! A Boring

Cross Section

Mitigation Area

20

25

30

35

40

45

50

55

60

0 100 200 300 400 500 600

ELEV

ATION (F

T)

STATION (FT)

FIGURE 2.  LOS PENASQUITOS CREEKEL CUERVO AL OESTE ‐ SECTION A‐A

FIELD SURVEY CROSS‐SECTION 2 ‐ HEC‐RAS CROSS‐SECTION  4677.59

Field Survey Existing Ground Existing 2‐ft Contours Surveyed Water Surface Elevation Winter High Water Mark (March 2013) Storm Event Water Surface Elevation

Water depth in section was too deep to survey. No information within the stream.

Approximate Boring (B05) Location

Parking Lot

Extent of Existing Riparian Vegetation

Existing  SDG&E AccessRoad Location

Soil Removal/Excavating Grade

Proposed Baseline Grading

Mitigation Area

Note(s): Plot contains significant vertical exaggeration in scale.Cross‐Section plotted from left to right looking in the downstream     (westerly) direction.Water surfaces shown are preliminary only.  Calculations were based on the Manning's Equation and preliminary survey data .   

25 Yr WSE

10 Yr WSE

5 Yr WSE

2 Yr WSE

30

35

40

45

50

55

60

65

70

75

80

70 170 270 370 470 570 670 770 870

ELEV

ATION (F

T)

STATION (FT)

FIGURE 3.  LOS PENASQUITOS CREEKEL CUERVO DEL SUR ‐ SECTION B‐B

FIELD SURVEY CROSS‐SECTION 2 ‐ HEC‐RAS CROSS‐SECTION 7566.95

Existing 2‐Ft Contour Field Survey Existing Ground Surveyed Water Surface Elevation Winter High Water Mark (March 2013) Storm Event Water Surface Elevation

Stopped Field Survey.   Due to dense vegetation.

Approximate Boring (B02) Location

Mitigation Area

Note(s): Plot contains significant vertical exaggeration in scale.Cross‐Section plotted from left to right looking in the downstream     (westerly) direction.Water surfaces shown are preliminary only.  Calculations were based on the Manning's Equation and preliminary survey data .   

25 Yr WSE10 Yr WSE

5 Yr WSE2 Yr WSE

Proposed Baseline Grading