HomeMy WebLinkAboutCT 73-10; LA COSTA ESTATES NORTH; REPORT OF THE SUBSURFACE INVESTIGATION; 1970-07-31,\
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/-.'!' ( //~ T. FUNNEKOTTER
REGISTERED, .• G.EOJ.OQISJ'~
CERTIFIED ENGINEERING GEOLOGIST
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ENGINEERING GEOLOGY GEOPHYSICAL INVESTIGATIONS;
:Iior, ,_ .
P. O. BOX 575 • ESCONDIDO. CALIF. 92025
746-2793 .
Benton Engineering Co
6741 El Cajon Blvd
San Diego,Calit. 92115
Attn: Wm. Catlin
Dear Sir,
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Subdivision' Design .:, '.' : -,
Pipelines· • Roadt. " ..... : .. ,~
Seismic:. Rlppability St~i()s " -. i. '~::l-,:<:.
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Enclosed is the report of the Subsurface
InVestigation in La Costa Valley made this week~ Your dob No.
70-7-23F. All originals for this job are also included. -These
lines are labelled A),B),C3 -----etc.for the third ADDITIONAL
investigation carried out here. The first study made' in this_
area used lines A,B,C, etc.
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Very truly
T. Funnekotter
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T. FUNNEKOTTER
REGISTEREO, G.!'.a~Q~JSr
CERTIFIED ENGINEERING GEOLOGIST
• ENGINEERING GEOLOGY GEOPHYSICAL INVESTIGATIONS
For
,Subdivision Design -': :
, Pipelines • Roods P. O. BOX 575 • ESCONDIDO, CALIF. 92025
746·2793 Seismic Rippabiliiy StudieS. '-', .: ,:-"
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Purpose: To evaluate subsurface conditions at five new locations at La
,Costa Valley in order to anticipate any rippability,problems' .'" '. -.~
that might exist. --.' .
Method: Refraction Seismograph and Geologic Reoonnaissance. '
Discussion: All areas investigated in this report are composed of extrusiv~
igneous flows such as andes~te and rhyolite. Seismio lines were
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run at five locations -total coverage is ,27°0 ,lineal feet •. ,These,'., ,,",
lines (A thru ~ with the number 3 after each) are positioned as
shown on the location plat.
In general, three layers were mapped -the upper soil layer,
the decomposed and fractured andesite and the lower parent rock
material. High velocity material was located on all lines from
depths of 2 to 40 feet. The Velocity of this material falls in
a range of 6400 to 9000 ft/sec. Most of the decomposed material,
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oVerlying the andesite falls within a velocity range of 3400. to ".
4500 ft/sec wi.th some higher velocity (5400 ft/sec) material.
indicated on line E3. ,The first location (lin,es' A3;B3) indi,cate,
a fairly thick overburden with inclUSions of blocks 'of high "
velocity material. Lines C),D3 indicate high Velocity material
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very near to the surface virtually OV'er the entire line~ The ,area,.-
of lines E3,H3 indicates a fa1rly thick overburd.en with a large',
marginal rippable zone in the center. Lines F) ~'G3 reveal high ' ..
velocity material approximately 10 feet average over the ~reater
part of the line, but somewhat deeper on, the southwest end.
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T. FUNNEKOTTER
REGISTERED G,EOLOGJST
CERTIFIED ENGINEERING GEOLOGIST
•• ENGINEERING GEOLOGY
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GEOPHYSICAL INVESTIGATIONS
Subdivision Design '
P. O. BOX 575 • ESCONDIDO, CALIF. 92025
746·2793
Pipelines -Roods " ',',:'
Seismic Rippobility Studies
Discussion (con't): Lines 13,~3 show a very erratic high velocity horizon
from 12 to 40 feet deep.
Conclusion: In general, this study indicates the presence of high ,velocity'
material near to the surface over most of' the, area. However,"
localized pockets of softer overburden were also located. The
best example of this is the area of lines A3,.B3. AJ.so within this.
overburden are blocks of hard material t some quite large. The hign
Velocity horizon is very erratic over the entire project, that is
it rises and falls very rapidly.
In terms of rippability, the following schedule would apply to,
this type of material:
Velocity
o to 2000 ft/sec
2000 to 5000 ft/sec
5000 to 5500 ft/sec
Over 5500 ft/sec
Excavation Method
Scraper,
",'Ripper
Marginal'
Drill & ,Shoot
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GENERAL, CONSIDERATION$
The follmving points should be considered vlhen evaluating Seismic
information:
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1. All velocities, depths, and thicknesses of layers are qualified
according to the following schedule;
G good
F fair
P poor
VP -very poor
? -questionable
Grades of G, F, and P can be considered reiiable~ VP and? should
be considered as indications only.
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2. Each profile provides information in the immediate area of that
profile -, extrapolation outward from this area must be ,considered
speculative unless additional information is available. ' ,
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3. The Seismic velocities measured indicate average densities of each
subsurface layer. This should not be construed to mean that large
variations exist ---generally this does not occur. '
4. In general, D-9 No~ 9 ripper performance is as follows:
Velocity Range
o to
2,000 to
5,000 to
2,000 ft./sec.
,5,000 ft./sec.
6,000 ft./sec.
6,000 ft./sec. and up
Excavation Method
Scraper '
Ripper '
Pre-blast for'ripper or
shovel-wagon :
Blast,ing and Shbvei-\.,a~on
Obviously, exceptions to these figures exist, however, these fig~res' ,
are based on over 2~0 jobs. ,,-
,5. F6~ trencher and back-hoe operations, the rippability figures
must be adjusted downward, i.e., velocities as low as 3,5'00,ft./sec.
may require blasting prior to excavation, depending on the honogeneity',
of the material, whereas material measuring over 4,500'ft./seq. almost
certainly would. As an average then, materials measuring 3,800 ft./sec.
or more would mean difficult trenching, and the economics of the
situation would probably dictate explosive work first.
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RIPPABILITY CHART
Seismic Velocity vrs Rippability
Based on 0-9 Cat
Rock
Velocity(ft/sec X 1000)
o 1 2 3 4 5 6 7 8 9 10
Sandstone
Shale
Basalt
Limestone
Schist
Conglomerate
Andesite
Gabbro
Granites
Breccia
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Rippable Marginal Non-rippable
GEOPHYSICAL
INVESTIGATIONS
FOR
SUBDIVISION DESIGN
PIPELINES" ROADS
SEISMIC
RIPPABILITY STUDIES
T. FUNNEKOTTER
REGISTERED GEOLOGIST
CERTIFIED
ENGINEERING GEOLOGIST
ENGINEERING GEOLOGY
p, 0, Box !!7!5
ESCONDIDO. CALII', 92021:1 746.2793
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JUN 19 '1973
CITY OF CARLSBAD
Engineering Departmetti
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SEWERAGE SYSTEM STUDY
C T 'l3'-/~
Prepared For
LEUCADIA COUNTY WATER DISTRICT
April 1973
By
ENGINEERING-SCIENCE, INC.
San Diego Office
lleadqunrters
150 North Snnta Anita Avenue
Arcadia, California 91006
11750 So~rento Valley Road
San Diego, California 92121
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ENGINEERING-SCIENCE, INC./SAN DIEGO
11750 SORRENTO VAI.LEY ROAD, SUITE 220 • SAN DIEGO, CAI.IFORNIA 92121 • 714/453-9650
Honorable ,Board of Directors
L'euc'udia County '(vater District
1959 El Camino Real
Le,ucadia, Calif.ornia 92.02L•
Gel1tlemen:
CABLE ADDReSS: E:NGINSCI '
4 April 1973
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In accordance with ou'r letter of 6 February 1973 and your subsequent
authori,zation, 'tve have completed our study of the anticipated<-"'daily f.lows
for the next few years) contingency plans to treat and dispos'e o£ flows
in excess of the capacities of the existing systems, the effect of large
annexations upon existing facilities, and review of the methi)'ds for
financing the required improvc,,1lents.
The results indicate that the Leucadia County Water District's treat-
ment plant is rapidly approaching its capacity and that the capacity'of
the effluent disposal system has already'heen' exeeeded.
Several plans were considered for treating and disposing 'of the
flows anticipated over the next few years and are presented in the report.
The recommended interim solution appears to be a combination of disposal.
at Encina and at La Costa through the existing percolation" evaporation"
and irrigation system.
The effect of major annexations to the District had been anticipated
in p.revious reports and will have an effect upon the existing systems.
liowever, if the annexed areas develop slowly, the sys.tems, can be expanded
to keep up with the development. It is also concluded that those who
"generate waste'tvater should finance the improvements' neces$,j.tatedby in-
c~eased demands upon the systems.
Methods of raising funds have been reviewed and are a180 included
in the report. The recommended solution is a combination of increased
connection fees, grants-in-aid and annexation fees.
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The report has been reviewed by the staff of the Jo;Lnt Adv~.~orL--_· .. :· t-t: 1< ,£9.TI!mi,t.t.e,e.,~, the Water Quality Control Board, and various developers with-L\.
in the District. It is suggested that the interim improvements needed !
to treat and dispose of wastewater during the ,constrllcti'on period of the '
Leucadia/Encinitas Sewerage System be initiated at once to allow for
. design and constlilcti.on scheduling. Scheduling of Phase II improvements
IiIi"OOUAIW';i~SI lno £1\9" I'OOll-IIL.!. nOULGV/,RD, ARCADIA. CALII'ORNlt. glOOO • 21!l / "!H)ol)llOl
1":la:~{tAf.(~l:li ""'1I,m ,,\"'VI'''~WMI'N'' ',"'ii,Itt" )'\)I'\\', "00 ~1ANOttol''I' WAY, ~~tlK~I.IW/ OM,II'Wl!jJA IiIl'lW '/;,lrJ I !)""I"T917(;
" • Honorable Board of Directors
Leucadia County Water District
4 April 1973'
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sh0uld also be advanced in the project list of the Water Quality Gont;ro'l'
Board and fees and rates programmed to cover the ~nticipated coat.
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Very truly yours,
"-,/)-:/ ~ '-;j.J /J . A~J~t:·/ ..... ~\./ /l ' ,f.~
Richard R. Deussen
Man~ger
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CHAPTER II
~ABLE.OF CONTENTS
-ANTICIPATED FLOWS
Introduction
,Present Daily Flows,.
Committed Service
Projected Demands
TREA1~ENT SYSTEM
Existing Facility
,P.roposed Syslt,em
C}~PTER III -DISPOSAL SYSTEM
Existing Scheme
San Marcos Outf.all
Buena Trunk Sewer
Encina Fa cil ity
Alternate Plan
Recommended System
CHAPTER IV -ANNEXATIONS
Proposed Annexations
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E-f.:fi:ec:t .. UponExist:ing Sys'to'ems
Effect Upon the Leucadia Encinitas Sewerage
. System
CHAPTER V -FINANCING
Alternative Methods
Proposed Method
CHAPTER VI CONCLUSIONS AND RECOMMENDATIONS
Conclusions
Recommendations
~PPENDIX
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A. Letter From San Diego Region Water Qaulity Control Board
tQ Leucadia County Water Water District
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I-10
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12
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15
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21
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Number
1-2
1-3
1-4
II-1
III .. 1
,;Number
1-1
II-1
:ritle
Type of Service and Equivalent Population
Commi~ted Service'
Leucadia County Water District
Anticipated Wastewater Flows
Encina Projected Flows
I,.
Cost Estimate for Interim Treatment
Component Capacity Encina Disposal' Scheme
f.IST OF FIGURE~
Tit-le
Leucadia' County \-later District
Projected Average Daily Flow
, .. Enc.ina TrJla tment Facility
Projected Flows
Leucadia County Water District
. System Modifications
Leucadia C9unty Water District
Proposed Annexation
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5
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,INTRODUCTION,
~JER I
t\NTICIPATED' FLOWS
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In recent months, waste\vater flo~.,s within the Leucadia County Water,
Dis-trict have increased drastically. In fact, the Regional Water--Quality I
,Cant-rol Board has requested that ~he District provide it \dth information
6n the status. of the Leu.cad,:i.a/Encinitas Sewage System project to deliver-,
wastewater flows to Encina, and a contingency phltn. to handle the incr,eased
flows during the constr.uction pe-riod .(Appendix A).
This report presents an evaluation of' the effect of tohe increasing
flows on the District ',s facilities as requested by the )3oard of Directors.
PRESENT DAILY FLOWS, • I
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In January 1972, there were 1,lQ9 connections to the District's
s·ewe·rage· system. By January 1973, this number had increased to a total
of 1,~15 connections. During the past few months, an average of 63 ne~
'connectiqns have been made each month. OVer 500 new connections .d.uring
the past year serves' approximately 1,800 additional people~ At 8.5 gal16ns
per capita per day (gpcd), around 150,000 gallons per day was added to .--~----~--------~--~--~-~
the' average daily flmv of 0.50 mgd reported in January 1972. However,'not
all of these connections to the sewer system are Bing1e-~amily units.
Table I-I indicates the variety of these service connections.
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rABI,E I-I
TYPE OF SERVICE AND EQUIVALENT POPULATION
Type Number Estimated Equivalent Pop~lation
Single Family
La Costa 111 277
Leucad ia Ovest of Saxony) 677 2031
Village Park 2-·7"5' '9·0'2
Green Valley 189 661 ,.
Multi-Unit
La Costa 556 :: 1223
Leucadia (West of Saxony) 225 495
Village Park 178 392
Traile.rs
JJeucadia (West'. of Saxony) 317 634
Green Valley 155 310
Mi·scellancous
S,chools 2 150·
Country Club 1 '360
Cabana 2 20
Restroom 2 20
, Health Spa 2 300
Hotels 3 250.
Offices 1 104
Laundry 1 200
Stable 1 20 ---TOTALS 2698 &409
Using the indicated equivalent population of 8409 at 85 gped, an aver-
age daily flow of 0.715 mgd is produced.
Actual recorded flows for January 1973 averaged 0.67 mgd and an aver-
age of 0.74 was measured in February. The':flo\o)' recorded for<February':
also inoluded .'some :.inf11tration. '.",0£ ·these "amountB;'fJ25 percent' of·, the
tl'eatod ~ff~uent 'wasl',pumped to La. Coata for di.spoBal, and the remainder
pumped to Encina.
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,COMMITTED SERVICE,
A surv.ey was conducted of the subdivisions approved within the
Dis·trict to determine ·hm-t much of the area was already contributin·g waste"
water in relationship to those lots promised 'service but were undeveloped.
The approved' subdivisions are shown :(n~:Table 1:'2 with the 'committed'
number of lots 'together with a li~ting·of·the qu~ber ~f.undeveloped, lots' •
.in t.hes\,Lbd.i:v.is ion.
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rABLE 1-2
,COMMITTED SERVI.CE
Subdivis ion Total Committed Lots Undeveloped Lots'.>
La Costa South 658 610
La Costa Mend ows 747 745
,La Costa Valley 5 5
La Costa Vale Unit No. 1 2l,9 249
La Costa Village 3 ~
La Costa canada 22 22
I.a Costa Hills 41 41
La Costa .Greens 10 9
. Village Park Units 1 9 336 .' .. ' ..... 136 . .
Village Park Villas 294 . . 294
Emerald Classic 128 56·
Summerfield Encinitas ',<., 198 180
Villinitas "
. ,',' .. 224 ':[20 :
Encinitas Estates ... 258 .250
TOTALS 3173 2820
The total of 2820 undeveloped lots (primarily single family unit.s)
already committed is approximately equiv~lent to the present average
• daily flow of 0.10 mgd. Fortunately, the major'ity ,of these undeveloped
lots are within the La Costa Land development: area and the past trends
indicate that these lots will be built upon over a longer period '0£ time
tban other lands currently bein'g developed.
If the existing flow of 0.74 and ,the committed demand of'O.70·were-
,t'otaled, the pre'sent average daily flovl would DE'I' 1.44 mg~. Th;l.s to.tal
is more than that purchased at Encina and approaches the capacity of thr
p,roposed Leucadia p,umping station (design III 2.0 mgd pe.ak) located, at t·he
,eXisting treatment plan't 's'ite.
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?ROJECTED DEMAND
:From the facts presented above, present daily flows, discusi3ions
with local developers and District staff, and utilizing past and present-
trends, the flows over the next fe\-1 yea,rs vlere estimated and are presented
in Table 1-3 and as shown graphically on Figure Iwl. This tab.le was
'generated taking into account 'only t'h'crse' 'kn'own a're'a's of 'd'evelopmentand
iricluded El Camino Glens, Santa Fi Glens and Spanish Village. The 1971
report: indicated an average daily flovl of-7.8 mgd ult:tmately, which is
ten ~imes the'present flow.
TABLE 1-3
LEUCADIA COUNTY WATER DISTRICT
~NTICIPATED WASTEWATER FLOWS
Year Average Daily Flow -mgd Peak Flow -mgd
1972 0.55 l.0
1973 0.76 , I ,1.3
1974 1.24..-. ' 2.1
-r97:S-1.65 2.7
f 1976 2.08 3.3 1
1977 2.50 4.0 --.. .......
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LEUCADIA COUNTY VJATER DISTRICT
F>"ROJECTED AVERt\GE DAilY i=lO\\I
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1970
y----_ ' PLANT '
CAPACITY 0.75 mg d '
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1971 1972 1973 1974 1975 1976 1977
YEAR
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Proj ected £lows at the Encina trea tment plant were estimatfJd by the·
·.County of San Diego and are tabulated on Table 1-4 and' shown on 'Figure 1,,:,2.
. 'to the figures shown in Table 1-4 the amounts projecte~ for Leucad-ia
were added sl1d a total calculated for the entire area. The present ·En.cina
plant capacity is 6.7~ mgd which will increase to 9.75 mgd after the
expansion to accommodate wa·ste~vat.er flows from LEfluca.dia . County Wa.ter
·D·lIs·t-r-i-c·t and .Encinitas Sanitary District.
:r'ABLE 1-4
~NCINA PROJECTED FLOW~
AVERAGE DAILY FLO~<1S
Agency 1973 1974 1975 1976
Vista 2.30 2.45 2.59 2.-74
19.77
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Carlsbad 1.60 1. 72 1.84 '1.95
2.88,\
2.07" "
Buena 0.21 0.23 0.26 0.28 0.31'
San Marcos 1.24 1.32 1.lf1 1.50 1.58
Encinitas 0.43 0.45 0.47 . 0.49 0.51
Leucadia 9..:.l§.. 1.24 1.65, ,Z,08 2,50/\ ,
TOTAL . 6.54 7.41 8.22 9.04 9.8'S --
From the estimates presented herein, it can readily be se~n that the
existing Leucadia plant is rapidly approaching ca.pacity and i.B already'
over-committed. The Encins facH ity has the capacity. to handle flows from
Leucadia during the construction period if the Encinitas flow and up to .
0.75 mgd (capacity of the Leucadia fa·cility) are subtracted £·rom the total
flO\o/. The amount treated at the Leucadia facility must be disposed of .
on 1.a Costa land by evaporation, percolation, and irrlgat~ion.
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The flows anticipa~ed at the-Leucadia PUinp Station after connection
to the Encina Facility, (es-dmated in July 1974), should be red.uced
conside:rably to around 0.9 mgd avera ge da,ily flow with a pea,k ra·,te -o'f
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approximately 1.5 mgd. Thi~ is due to the fact that some of Leucadia
flow will be intercepted and transported to Encina before reaching the
Leucadia Pump Station.
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ENCINA TREATMENT FACILITY
PROJECTED FL.OVJS
12 ~ __ ~ ____ ~--~----r---~--~r---~--~
__ ~-Totol of All
Agenci'es
10 ~------~~--------~----~.~--~~~~
-1-_ .... ' Plo'nt Capacity
Aft-ar Ex,pa'osion
a ~--------~----~~~--------~------~
1'..4---L.C.W.D. and E.S. D.
Connected to 'System
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Plant Capacity Before Expansion '~ .. 6 .. ~-... ~,.....--I----"""""'-'-~""""""":--~~";"-""'--~
o
..J L!.. Total of Agencies Without Encinitas and
0.75 mgd of Leucadia Flow
4 ~------~~------~~------~~------~
Vista
Le.ucadia L_----1~-~--r---II-=:::~~-Carls,bad
2t====t===~~~~--~,---San Marcos
o L-__ ~ __ ~~--~----~--~--~~--~--~
1973 1974 1975 1976 1977
YEARS
Encinitas,
Buena
t----... -.... -----------~'\"'" --E,-N-G-IN-, E-' E-' R-I-N-G---S-C-I-E-N-CS-'11 -IN-lC.,
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!EXI.STJ;NG FACILITY
CHAPTER II
1REATMENT SYSTEM
The existing 'Bocondary 'trtHltmont Byst'em at. Leucadia iB compoBQa 0'£ a
primary clarifier, tr:i.ckling filter, secondary cla.rifier, and chl.orine '
contact chamber. The capacity of the system is ra,ted at 0.75 mgd 'a,nd is
shm,m on: Figure II-l (dashed lines).
Sludge is processed ~nerobically by digestion and hauled to Bneina
, for d'isposal. Supernatant is returned to the primary clarifier.
,1?ROPOSED SYSTE11
As mentioned previously, the average daily flow received by the'
Leuead ia' 'rrea,tment Plant has heen fe·r.ecas4: ,t·o inc,r,ea,s,ef?=.om the level
of 0 e 76 mgd in Su1y of 1973 to 1.26 mgd by July. ~974 ...
In order to adequately process this Volume, it is recom~ended tha~
a portion of the flow be diverted prior to entering the treatment plant
headworks, passed through a rotating screen to remove large solids,. and
pumped to Encina for further trea.tment. This .process is shown by the'
heavy lines on Figure II-I. The remainder of the influent to' the Leucadia
Plant would continue to' receive secondary treatment prior to disposal at
La Costa •
. The estimated cost of modification is shown in· Table II-l •
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LEUCADlA COUNT""" WATE'R DISTRICT
SYSTEM MOD:IFICATI.ONS·
J TO l.A:J COSTA .' .
TO ENCINA--I.t-I. , ~ r--t ..,.-. .., . Ir-T ..... -,I _I
,..-i-~ -I .1 ro.1.. ... '· ,/ ¢ 1 II I I ... -;;: .:-_ ~ '"' /.Jr. \~,.z I 1 I. I '/ .... ",/ r' "f -L 1
. // ~ECONDA'RY"~ . ·1 CHLO~I~:;/ 1
r": . ., I 'CLARIFIER \\ . I CONTACT it,.,¥~ - --4 -'---0 11--0---1 ·TANK T \ \ I 1'1-" , \\ I 1/ I / ,,1 II I
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Io""J. \ I ,II ()-l I Y . . .
\, ~.\ ',. 1./ "j-'_'_"-V.-I< .R.OT.AT..ING \ \\ 'J./-,/,.."t.. . . I· SCREEN
','" /1 '< " // , ..... '...... ..... ---~-:.; . I \ ........ ----". , ___ I
, . ,..;-- -...... I
, ~". ...... " I
" /1 PRIMAHY" I II Cl.ARIFIER \ '\ r -0 1,
" \ I I , " ~ 11 !~) I 1
, \ \ I J/ L.,r;:.J I BARMINUTOR~ ',\ I I~L j i I . \ \\ I <.1 I ....." //.y I .......... ::-.... ..:--j-..;' ~ /v I I --~ -f1 171"t--~ --:."{'~~)---1.-1 nL_L.J ..... ".. I ~-:r -;-1:1,:, I ,,{ r .., ~ ..... ~ -.......~.......a . Lr
I . FLOW I ..... ...J: ;:: =:..:.~ )
A SPLITTER I /'" otGESiOR' 'X/ ¥ I I '. /,
I I r . ~/ \
I I I /. /'\ \ I I ,/
CH~ORINE
LEGEND
---~ ... Existing
-• ·Proposed
•
I
TABLE 11-1
COST ESTIMATE FOR INTERIM TREATMENT
Item Unit Total
l. Screen 1 ' $16,,000
2. ,12" PVC Pipe and Valves 150 Lin. 'tto' 3,000
3. Flow splitte',r 1 3,000
4. Electrical L. S .' ~ 3 ,00'0 ,
5. Chlor,ination Connection L. S. 3~OOO
To,tl'll $26,POO
The supernatant from the digestor could also be returned through
the s,creen and pumped to Encina. This ,should considerably irqproVe the
quality of the wastewater treated by the Leucadia Treatment Plant. '
Solids collected by the screen could be returned to the headwopks
for normal processing through the LeucadiaPlant~ The solids could
amount to 400 pounds per day and would require daily removal.
The screen v]ould require cleaning approximately once 'a month using
the new hydrojet.
• Thus, the flow into the plant may be divided into two portions.
One would receive secondary treatment and chlorination and the otl;1er
"primary" treatment without chlorination.
Chlorination of the secondary treated effluent would be maintained
by introducing a new point of conta'ct in the effll;1ent' wet well and also
into the 'for,ce main.
, .. S·,
1'1 .1 , I ,
Treating the secondary effluent to reduce the total dissolved solids
,to 'a level to be continuous 1y ap,plied to the golf course, was review~d.
How,ever, to co,nstruct proeesses which could j.n~ IU,de electrod ialY!3is,
reverse osmosis or dista11ation would be a tremendou~ expense and in all
,p.ro.bability exceed the present cost of ,p,otable water. If directed, this
t:neans of treatment and d~sposal could be m,Q,te close1y analysed.
, ,
•
CHAPTER ,III
DISPOSAL SYSTEM '--.. J
,EXISTING SCHEHE'
The Leucadia County ,Water District i:s pres'ently disposing of 'trea-ted
.ef:fluent in two different wa.ys. The ,f,irst is b¥ pumping from the ~hlorine
contact ta,nk with a vertical turbine pump through an 8-inch force main
to the oht,fall owned by the San Marcos County Water District. ; This
outfall then connects to the Buena Sanitation District's trunk sewer
which connects, in turn, to the Encina Trea'tment Facility. After going
through the Encina plant, wast,ewater is discharged to the ocean.
The second: method is utilized only when the first method is unable
to handle the peak d'emands~ present'ly about 25 percent of the time.
,This method in:v:ol¥6s p.ump.ing -treate.d .and .ch.lQr~:Lna(t,e.d, .. e£f.luent to .the
lake in the La Costa golf course. -From the lake it is pumped by La
Costa to percolation and evaporation ponds or used to irr'igate the-golf
course.
The capacity of the first scheme is shown in Table III-lo
-"
I !
j :
i ' I .... :
{ " : ' , ,t
,
.i
Item
Effluen.t Pump
Force Main
San Hal-COS Outfall
Buena Trunk Sewer
Encina Facility
Ocean Outfall
TABLE III-1
COMPONE~~ CAPACll~
ENCINA nISPOS1\lJ" SCHEME
" .. -. , '" Capacity
, 0.7 mgd
'0.7 mgd
16.2 mgd "
6.9 mgd
6.8 mgd
40',0 mgd
The use of facilities beyond Leucadia's system and pr.oblems with
available capacity is discussed in the following paragraphs.
SAN-l~RCOS OUTFALL
Capacity in the 18-inch San Marcos outfall presents no apparent
problem for the short period of time involved (July 1973 ,to July 1974),.
Present flows from Sa1.1 Marcos could reach a peak value of 3,.26 mgd when
all pumps are operating. This value when added ,to the expected flow
from Leucadia is far below the available capac~ty •
..illI,§.tlA TRUNK SEWER
With all possible pumps operating within the Buena Sanitation
District, a ma}cimum of 1. 23 mgd eouid be contributed 'to the trunk .Sewer.
When added to the values from the San Marcos County Water District and
the Leucadia County Hater District, the total volum',: to be transported
is less than the available capacity over the period from July 1973 to
. '.
"1
1 , July 1974.
]:!:NCINA FACILITY
As discussed and shown in Chapter I, the Encina-Fac,ility is ,capahl.e'
o:tprocessing t'he flows from all contriout'ing' a'gencies includi'ng-"t;ne'
Leucadia County Water District ,during the construction' period.:,"
ALTERNATIVE PLANS
The two critical items in, the di'spos'al 'schemc;l to Encina are the
effluent pump and force rna in as neither cap handle the anticipa'ted volumes
of flow. In order to rectify the condition, three alternative plans for
increasing the effluent pumping capability ~vere reviewed. The£!e included
a parallel pump unit in the chlorine contact chamber at the Leucadia
Treatment Plant, a parallel force main from the Leucadia Treatment Plant
to the San Marcos outfall, or an additional pump system approximately ~J:' ~ ;:.,.:
halfway up the length of the force main.
, A parallel pump system could be in~talled to handle 1.0 mgd peak
flmv. The total dynamic head would approximate 600 feet and the, exist'in:g
force main could withstand the pressure generated including shut-off
ponditions. Surge protection wo~ld be required, however, to eliminate
excessive pressures during power failures. Volumes of flow in excess of
1.0 mgd would create excessive head values on an above ground pipeline.
The estimated cost would approximate $28,000.
A parallel force main would not substantially increase the flow
utilizing only the existing pump because of the steep slope of the pump
curve. The exist'ing pump, for examp~e, would only increase from a
-12'!'"
I
I.: ! '
e e
capacity of 500 gallons per minute to 600 gpm. By adding another unit?
the capacity could be doubled a·t approximately the existing head va~ueB.
Howeyer, the cost of paralleling the fo.rce main and adding another
pumping unit \vou1d total :$108,000.
Adding another pump at Alga Road (which is approximately half the
length 0'£ the force main) could double the capacity of' the existi:ng force
main. Ho~vever, the existing pump would also have to 'be replaced to cover
the new 10\ver range of total dynamic head values;. The estimat'ed cost of
this alternative is $41,000.
RECOMNENDED SYSTEM
Th'e recommended system is that using an additional pump at Alga Road,
and is selected for several reasons.
No deduction was included fo~ the salvage value of the existing unit
in the estimated ~ost of $36,000. That value is presently unknown but
could range up to $4,000.
The'values for total dynamic head would remain approximately the
same as they are presently thus reducing the need for surge ana~ysis and
possibly surge suppression equipment~ The parallel pump system was not
chosen as it would pose an even more dangerous situation than presently
exists if heads increased to values of 1-,000 feet in the existing above-
ground pipeline.
One possible problem with the recommended plan is communication.
In other works, both pumps must operate simultaneously and one unit must
"13-
e •
"t~ll" the other when it is in operation. Flow switches Or a t,,?lemet,ry
s~stem might be required.
") ,
)
"
" e •• " , . . PHAPTER. IV
"
i ANNEXAT.lONf?
lROPOSED ANNEXATIONS
Several developers inc Iud ing La .. Cos ta, Donald Ayres, and
Ponderosa Homes have requested annexation to the District. Thes.e pr.o-
and south of Batiquitos Lagoon. The area to the south would include
the land between the present District Boundaries east of El Camin!=> Real.
[
The northern area, although in the Carlsbad S~rvice Area, cou~d be
: by' the District. "These annexa tions' are shown on Figure IV-:l. .. ".
served
Th.e areas would be developed over an extended period of time in
conformance with the adopted Zoning Plan of the City of Carlsbad. An-
ticipated densities could vary from 1.5 to 4'3 dwelling 'units per a'cre.
At present, vel:y little information is available onwastewat:er flows
to be genera~ed by the areas proposed for annexation. However, the 1971
report by Engineering-Science, Inc. did include all of the tributary area
.' Bouth of Batiquitos Lagoon and east of El Camino Real and was, projected
into the 4.5 mgd total peak flow 'to be generated from Green Valley.
However, the area north: of Batiquitos Lagoon was not include.d in
,
s·tudy and was aSBumed to be serviced by the City of Carlsbad.
--------.---.......-.~~At'f':'o~~..,-,.~_,.(#'
EFFECT ON EXISTING SYSTEM~
The southern annexation, shown on Figure IV-l, would be serviced
by the existing Green Valley Trunk Sewer which has a capacity of aroun!1
2 mgd downstream of Olivenhain Road. This capacity is .already committed
·r .. ,l.~:"
I I .~ I
l:J"'O z~ Zo 111 . x"O ·0 :: ~(J) .>
_rrt ..; ,..
00 :;
z c
V'
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('l ..;
"" .2
~
',. I
" I ,..,
'" ::: I '" I en ! (')
m ! :;::
(')
!" I I :z: p ,
I i I !
.\ ,
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"
·e
to Assessment District Number One ·ti,1ich pa id ·'for the Trunk Sewer. :The
existing trunk sewer will have to be paralleled ~ith another larger sewer
t'o transport the porjected f~ows,.
It is e's,timated that if the entire area ·we·re to be annexed at the
same time" the annexation fee plus available funds would allow ·the
·Distr'iet to fund construction of the parallel trunk sewer.
minimal. By the time annexation could Occur and .development begun, the
,existing system will be abandoned and the permanent connection to Encins
will have been completed. It is rea sonable to assume, therefore, that
the annexations would have no effect ~pon the existing or the proposed
interim system to be put into effect d~ring the construction phase of
the Leucadia/Encinitas Sewerage System Project •.
The northern annexation would require an outfall and force maln to
the existing treatment facility and the proposed Leucadia Pump Station.
Because the area ha s neither annexed to the City of Carlsbad nor' the
Leucadia County Water District, the delivery of wastewater fo'C tr·ea·tmeilt
and disposal is at least two to three years away. Therefore, no effect
is expected ~pon the existing systems.
Other annexations which might occur south of Batiquitos Lagoon,
namely the Eolus-Hymettus Area were included in phases of ' the project
to deliver wastewater flow to the Encina Facility. All of this area would
be transported to Encina. prior to d'elivery to the Leucadia Pump Station.
. '. "
••
EFFECT ON THE LEUCADIA/ENCINITAS SEWERAGE SYSTEM
1 .
I
) The Leucadia/Encinitas Sewerage System wiU indeed feel the ef;t:ect's
I
ot annexation. The southern annexation would require that. the proposed'
sys·tem be ·augmented sooner while the nor.thern annexa t ion would ~eCJ;uire
that the project be increased in size in its next 'expansion.
I , .
The' proposed pump station at Leucadia contains four unit,s. Two of
'. t,llase pump's are rated a·t 900 gpm and two at 1,500 gpm a,t a top speed o~
1750 rpm. With both large pumps operating in parallel, around 1,800 gpm
is generated or 2.6 mgd. It should be noted that the July 1974 peak fl.ow
is estimated at 2.1 mgd for the entire District. The estimated pe'ak
flow at the Leucadia Pump Station however, will .drop to 1.5 mgd after
connection to the E~cina Facility. This is due to the fact that both
the Saxony and Vulcan Stations will discharge directly into the new for.ce
main going to the Encina Facility.
Therefore, because annexations increase the rate of wastewater,
. generation, they thus decrease the time between required expansion im-
provemen,ts. These expansions can be programmed quite easily, hbwever,
for both construction and financing if potential developets realize that,
since. their' a ctivities create new demands they will be required to pa'y
the costs invo~ved in arriving at solbtions •
....
I .
I "l7-
•
,CHtWTER V
FINANCING'
ALTERNAT.IVE METHOD~
A number of methods for raising funds for improvement projects, are
available and include:
1') Gent'!ral Obligation B'onds'
2) Revenue Bonds
3) Sewer Service Charges
4) Special Assessment~ , ,
'5) Connection Fees ' '
6) Annexation Fees
7) Contributions
8) :Federa'l Assistance
9) , Special Fees
10) ,Ad 'Valorem 'Taxes
At one time or another, the Distr,ic,t 'has utilized all of the above
, ,
methods except Revenue Bonds'; which have several disadvantages, and have
never been economically feasible.
Federal and State assistance is presently available in amounts up
to 87~ percent of t.he project costs. However, eligibility depends on
many facets and has been primarily concentrated on treatment and disposal,
projects which regionalize facilities.
Under amerldments to the Federal Water Pollution Control ,Act of 1972,
funds were authorized by Congress for collection systems' meeting certain
"
... .. 18'"
•
requirements as well as for interceptor sewers. ,However, the executive
b.ranch ha s not yet rel~ased these funds or expressed any desire to allow
the~ to be disbursed. Funding of future collection systems or trunk Bewe~s
should therefore not be based upq,n anticipat:ed grantElRinRaid.
PROPOSED METHOD
Under the provisions of SB90, the District may not raise its tax
r~te exclusive of the rate for bond interest ari'd r'ed'emption eha.tges,'
"
unless approved by a vote of the residents of th~ ,District. Howev~r,
"
even by maintaining the present rate, substantial funds can be raised
,for sewer improvements. It is estimated that with a 10-.1'5 percent
increase in the assessed valuation per year, approximately $150,000 can
be realized for cap;tal improvements anrmally;'
In a,ddition, BB90 does allow the'Distr'l:ct to levy 'a tax ''l.''at'e on
annexed territory to the 'extent necessary to collect obligations arising
from t~e terms and conditions of the annexation.
The interim improvements needed ~uring the construction phase of
the Leucadia/Encinitas Se~verage System project should be financed by .
those generating the increased flows,. These flows are being genera.ted
in the District by new houses and other facilities built by developers.
The $100 ~er connection surcharge should be maintained-indefinitely and
serious consideration should be given to increasing,this amount.
La Costa funded 85 percent, of the cost of the temporary for'ce 'ma in
to Encina and is being reimbursed by the District using the p~ese~t $100
-19'"
••
surcharge. This method is a provm'l 'one ,and could be utilized again fo1:'
the interim improvements required. However, other ·develope·l:s s·hould also'
parti~ipate in the initial cost.
Connection fees should also be reviewed w.it,-h new thought 'given tc)
rai'sing the special $100 rate under Art.iele VI, Secti?n 4, of Resolution
21,6 ,toa figure more in line with the re.8u1ax District r~·te· of $300, t·o.
,
" $l~OO p:er,connect.io,no' This monEl)'" shoul,d be Bet aside for f~.ll1din,g the next
f
major improvement at Encina.or in the facil~ties to deLiver t~ucadia's
flow to En·cin~.
"
"
I,
, .
, '
, .
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• f
,
·20 ..
. .
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••
GHAPTER VI
CONCLUSIONS AND 'RECOMMENDATIONS
,CONCLUS ION 9. I .•
The 'existing Leucadia treatment facility will reach c8.paci'ty very"
short;;:lY. and the existing dispos&l system capac.ity 'to" EnC:ina:::.'.ha:·a"a,lr..~.dy?·
peen' e·xceed·ed.
Approximately .1.24 mgd average flow must be processed.·during the .,
'construction phase by the tr.ea,tment plant and 2.1 mgd peak flow must be
'transported by.'the disposal ~ystem.
The Encina treatment plant capacity 'should not be .exceeded prior"
to the connection of Leucadia and Encinitas,. if Leucadia discharges a; . port:io~ (up to 0.75 Il!gd) of its flow to La Costa for disposaL:'
The eXisting tre~tment system at Leucadia can .on1y tre,at .' O. 75 mgd
and must b~ augmented to treat additional flows •. The existing disposal
system is adequate except for the pump and force main portiOns. These
must be increased in capacity.
.
Annexations wou+d'increase the extent and frequency of improvement~
to ehe sewerage system. However, by careful management-,. they can. be. "
serviced. Also, funds can be acquired to build the necessary-impr'ove~
menta from those'who generate wastewater by an increaa6 in connecti~n:'
., fees, con,tributions, annexation. feest,. or othe~. meanfl".,
RECOMMENDATIONS
To augment the existing treatment system during,construction of
..
'1"\.
• •
the Leucadia/Encinitas Sewerage System, ic is recommended that a portion
of the influent be separated and pass'ed_ 'through· a. ro-tating screen, to
r~m0ve· .soLid,s. ,This "primary' treatedtt effluent would then be pumped to
E'ncina through the existing disposal sys-t'~m .. , _: The existing dispo~al .
syst;mwould be increased in capacity by 'installing a second pumping
unit ,at Alga Road.
The existing Leucadiapla:nt 'would C'o'rtt:i:.nue--to·-tr'e-at '0. 7S"mgd-and, '
;'
,pump thi:s secondary treated effluent to La -G-o-sta-' for ,disposal by-
irrigation, ,percolation and evaporatiol1'r It-would also be possible to
,-'
pump the entire amount to EJ:?<;inar·during-low 'flo~~ periads..,~ Xf flows are
stored at La Costa during the day, it would be--,possihle: to-puml'1 tnEF_, ,
"
stored effluent to Encina during the night:.,',
The estimated cost of the system necessary to continue operation
during the construction p~ase of the Leucadia/Enci~itas Sewerage System
is:
1) 'l'reatmen,t ' $?6,000
2) Disposal §4l, 000,
,Subtotal $67,900
, "
3) Contingency $~3, 000
Subtotal $80,000
4) A~minis trat ion, Legal, Engineering,
surveying, Inspection J $15,000
5) -Right-of-Way 0
. Total $95,000
Annexations can proceed provided funds are set' aside to'finance the
improvements needed to accomodate them. The southern annexation should
• •
annex as a whole unit, thus allowing the District to help fihaJ,1(.!e con-'
struCtiOll of a parallel Green'''Valley~,Tr,unk''Sewer' from '~the ahnexa'tio,n.::' ,'I'
·fee.
Becaus'e annexations speed up the scheduling o'f pl'ojects and : thus.
the financ,ing, serious consider'ation should be given .to :i.ncreasing the·
connec·tion fee immediately. In addition, pOBsibily, an annexation .fee
should be levied upon the annexed te.rr.i.to):y .to c.o,Ver the cos ts o,f fu·tu;t'e
improvements, This might now be particularlysui~able for t~e northern
annexation, which was not originally programmed into phases, of the 'pro-
ject.
In order to accomodate the propoB~d annexations and because the
District is presently over-committed in 'total lMstewater fl,ow, it is
recommended that Pha se II of the Leucadia/Encinitas pr,oject be scheduled
earlier than the present 1977-78 date. It should be planned for fiscal
year 1973-74 and arranged with the State Regional Water Quality Control
Board. In addition, consideration m~st be giv'en t~ increasing. the size
of the Pl.~oposed force mains under the Leuc'ad,ia/Encinitas Sewerage Sys·tem.
If pOSSible, from an ,administrative point of View, this ·would extend the
" 1(ll /'
(. '1. (.,
LikeWise, the purchased flow capa(!f'EY"''''''in-Vt~e ...... Encina 'e~pans'i~n:r.~ i
hydraulic life of the system.
/' ? ;.:>''\
. 1.25 mgd for treatment and 9-.0 mgd for dispoBa1.~ The District should _"'7.. ... _-'.-
~ , . /'-
begin negotiations with the,.o\'mers to· lease a .... por·tion of ·the.ir capac.ity·
• • ....... "'t-.. """-.... ,_ .. ,. ......... ~ • .ot~ '" I ;::.
which iEf'. not, presently, bel,ng ··used by., them. ;",: The" District' B 4.0, I'!rgd •. purchased
capacity in the' outfal~ would appear to be adequate unt.il the beg,inning
of 1978J at which time additional capacity will have to. be acquired frp~
the other owners. The ocean outfall itself has adequate capacity
... ~
• ,
,(40 mgd without pumping) to service all of the owners for an extended
period o,ft-ime.
A technical report, recently comp~eted; recommends expansion to'
15 mgd in 1975 along with upgrading of the treatment process. The.,
estimated cost is approximately $4,210,000 for chemical treatment, of
\'lhich Leucadia's share would be around $520,000 without purchasing I"
aaal'tiotral cap'aC:'i'ty. '1I:dd'i:t'i:OIrE1:'l 'C"ap-llc<f'ty' 'cos'1:s'W'il-l: dep~nd. on ,the
amount purchased. ' From the present' project', 'the",3'.O",mgd ·.tt'eatment:;'plant
expansion will cost approximately $780,000 without grants-in-aid.'
Leucadia's share of"that cost for 1.25 mg4 purchased capacity will,,'be
around $325,000.
With these costs facing the District, it is important that the job
of collecting the funds begin immediately by' increasing connection fees
and maintaining the tax rate at,'a level to provide the required c,apita1
improvement'monies. .... .
"If these recommendations are not initiated, the District: has-the'
recourse of placing a moratorium on connections.-, Th~s .actiC?~ 'could . ,
forstall future improvements,' but the interim,treatmenc and disposal'
work still will be required.
, I
" .
• tit i!VNALU, .rI,,"·,.'· X ... ,=="",.. ""'ti ====:sr=_ ...... -.~.-~r«------..,· ,"''''_-= ....... ::.::z::o====.=.:..
, CALIFOHN-IA REGl.QNAL .WATER QUALITY CONT~OL BOARD-
:'I·A·tI~ llf tld.lrO:lNIA-R[SOURCES AGl:NCY
. SAN DlEGO REGION
1350 FRONi' SJREET; 'ROOM :203,B I . I •• . "
.SI 'IEGO, CALIfORNIA 92191 I ',', \
, '.
.,
, . ,
.. . ~ .
II • "
MR.. R I.CH·AllO E. HANSON
S.~CR.E'r."'RV-MANAGE:n
, "
L~UC.A·O I,A CO,U:NTV W/ .. :r.fJ.R OIS'rR ',0'1"
1:95>'9 J£ .... CAM I·NO RE:A:L.
L·£VCAO.I'A, ,CAl:.1P'ORN.I'A 92024
. ' . . " . ,
, ! ' .
TH'IS .\.1,11..1.. AC.KN.O\.JL,EOGE RE:C£IPi Of" YOUR L.[;:,(,(E:R Of' Oo'rooeR ·4, 1972, ·\oI'I"I'H
A'riACUe:O aAOiCRIOLOGICAI., OIOL.OGICAI., AND OHEMIO .... I. CAiA ON '(HE. CP'f'L.UE;NT,
~UDMl'ir'O AS THE QUARiE:RL.V REPORiS FOR QUARiERS ENDING JUNE 30 AND SEP-
TE:MQ~tl 30, 1972.
IT WAS 'Wl'rH GREA'''' INTERESi, AND NOi \.JliHOUi OONCERN, iHAi 5'(AFf' NOiE:'D
'rUE: f"LOW H,A,S INCR.!::ASe:O f"ROM 0.524 MQO IN JUNE i,O 0.-607 MGO IN Se:pn::MOER.
As WE ARE DOiH AWARE, iHE AREA iR I aUTARY ro ',"HE '-e:UCAOI A COUNiY ItIATER
U.SiRICT TREATMENi SYSiEM IS ONE:' IN WH,ICH VIGOROUS w'O:tSPRCAD DWE:L.l.ING
CONS~RUCiION IS iAKING PLACE. THIS IS RE~LEOTED .~ iHE VERY S'GNIFICANT
, FLOW iNCREASE EXPERIENCED DURING THE JUNE TO SEPiEMDER QUARTER. If" iHE
PRESENT iRENO IN Fl.O·\J INCREASe: CONiINUe:S, ANO f"ROM OUR OOSERVAT'ON$ OF
I, C.QNS'RucrloN ACtIVITIES A' ,HE LA' CostA AND Avoo DEVELOPMEN'S Ii APptARS
CERTldN. iHAi JT \0111.1., f"1..0,"/ INTO THE TREATMENT F'ACIL.lilE:S COUloD EASIL.Y
EXOEED '(HEIR 0.75 1'1<00 OAPA(}i'·Y WITHIN It PERIOD Of" IiPPROXIMAiEL.Y SIX MONtHS •
. l=l~C;AU.St:: Of' iHE: APPARENi RAPID INCREASE IN Ft.OW, COUPLED WITH '(HE FACT
Tt!~'i CON'STRVCTTO'r-r Or--"Tlff:' PERt1ANEiN'i' FACIL.ITlES iO .CONVEY WAS'fE WATCR f"RCM', •
T:rH~.ENC'N''fAS SANliAR'( DISTrHCi ANO' 'iii'£'" LECfC'AO'f'ACOlfl'liY""''rJAiE:R'' DISTR'lC'T .. "
H"I'S ;.40'( Yr.1' bEGUN, SrAf"F IS CON·CERNEO THAT',. CR'r-s:r's S'1··ru'k"t'I·~N..IlU .. ~l:..A.GAlN
0f:v·CI..OP W'TH'RESPCC'I iO TRF-'f,;rl'i'EN, ANO ·{HSPOSAL OF WAST·£' VJA.'tER.:t:.Ro.M THE:' '._
L.,::~.CAO" A COU'N'i'Y WATE:R 0 I Si-fH c'r Ilf':f"OR f: 'rH E: .LONG-R "NG E P EiRMAN ENiSOL.Uil ON"
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<.t7 7& /0
ENVIRONMENTAL IMPACT
REPORT
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RIC~" ENGINEERING COMPANY
San Diego. California
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TABLE OF CONTENTS
A. The Environmental Impact of the Proposed Action
1. Project Description
2. Environmental Setting Without the Proj ect
3.
(a) Topography
(b) Land Use
(c) Biology
(d) Geology
(e) Archeology
(n: Hi s tc?ry
Environmental Impacts
(a) Land Use
(b) Grading
(c) Biology
(d) l\r,-.hoAlrvy:v ......... -..... --........... ~;z
(e) History
(f) Drainage -Water Quality
(g) Traffic
(h) N0ise
(i) Air Quality
(j) Utilities
(k) Community Services
B. Any Adverse Environmental Effects Which Cannot
Be Avoided Should The Proposal Be Implemented
C. Mitigation Measures Proposed To Minimize the
Impact
D. Alternatives To the Proposed Action
E. The Relationship Between Local Short-Term Uses
Of Manl s Environment And The Maintenance And
Enhancement Of Long-Term Environmental
Productivity
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. F. Any Irreversible Environmental Change.s VvThich .Would
Be Invqlved In The Proposed Action Should It Be
I.mplemented
G. The Growth Inducing Impacts Of The Proposed Activity
Upon The Neighborhood And/Or Community
H. The Boundaries Of The Area Which May Be
Significantly Affected 'By The Proposed Activity
I. Certification Of Accuracy And Qualifications Of
Individuals Preparing Draft Environmental Impact
R~ort •
J. . List Of All Agencies I Organizations I Or Individuals
Consulted
Appendix A -SpeCies List
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A.
1.
THE ,ENVIRONMENTAL IMPACT OF THE PROPOSED ACTION
The proposed proiect, La Costa Estates North, is a subdivision of
140 ,acres of undeveloped land. It is located southeast of Alga Road
and west of San Marcos Creek Canyon in the southern portion of the
City of Carlsbad'.
The developer, La Costa Land Company, is applying for appro-
val of a specific plan and tentative map.
The project site, as well as the surrounding area is part of the
La Costa Master Development Plan. The plan was approved by the
City of Carlsbad Planning Commi~si01with Resolution No. 808 on
July 25, 1972, and by the City (buncil with Resolution No. 2058
on August IS, 1972, and Ordinance No~ 9322 on September 5, 1972.
PROJECT DESCRIPTION
The development of La Costa Estates North will involve, con-
struction of public streets and installation -of improvements for the
future construction of 90 single family residential units. Two
additional large lots will be retained in their natural state 0
The residential areas of La Costa Estates North will be developed
at an overall density of 1. 5 dwelling units per gross acre. The
proposed development contemplates a community comprised of
single-family dwellings with a minimum lot size of one-half acre.
These residential, as well as the natural lots I will be graded only
where necessary to allow construction of streets 0
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By initiating protective conditions and deed restrictions, the
La Costa Land Company will insure that future construction of
houses within the proj ect will adhere to certain minimum standards.
Such conditions as prior approval of structure and landscape plans,
and the style, design, appearance and location of the structure,
will insure a quality development. Alterations to the structure or to the
landscaping also require approval. Conditions have also been
established to insure maintenance of the lots ~ The remainder of the
lots will be retained in their natural state. All cut and fill slopes
created by grading of the streets will be planted to stabilize the slopes
and reduce erosion.
A 200 foot easement for the San Diego Gas and Electric power
lines forms the northern boundary of the proj ect and the southern
boundary. of the proj ect is traversed from east to west by a 100 foot
easement. These easements will be temporarily kept in their natural
conditions until lots contiguous to them are developed, at.which
time they may be landscaped.
Access to the property is at present from Alga Road, which runs
in a north/south direction along the northwest portion of the project
site. Access is also available from EI Fuerte Street, ,located to the
northeast of the site. Proposed for construction as part of this
proj ect are two acce s s roads from Ali can te Hills. The se roads are
Alicante Road, which will enter from the southwest, and Candil Way I
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which enters from the southeast protion of La Costa Estates North.
A system of aesthetically designed streets and cul-de-sacs will
provide access to all lots within the development.
An access road, s.outh of La Costa Estates, is proposed to connect
the Alicante Hills project with the La Costa South development. This
road, designed for use only in emergencies, will cross San Marcos
Creek. An 18 inch low flow pipe will be used at the grade crossing
and will be covered by 2 or 3 feet of fill. The proposed road will be
graded 24 feet wide and improved to a 20-foot width. Community
services are located on both sides of San Marcos Creek 0 There will
be no need for this ro?-d to be used as part of the circulation system;
this road will be used only as an access to utilities and is designed
as such to discourage public usage. This road will be on a public
utility easement maintained by the City of Carlsbad.
Utility service will be provided to all lots within La Costa Estates
North. The sewer system for the proj ect will be connected to an
existing sewer main in the La Costa Golf Course. Water service will
be provided from an existing main which runs south in El Fuerte Street
from the La Costa Meadows Unit No.4; Gas and electric service
will also be provided from within La Costa Meadows, just north of
the proposed project. All utilities, with the exception of the existing
power lines within the San Diego Gas and Electric easements, will be
placed underground.
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20 ENVIRONMENTAL SETTING WITHOUT THE PROJECT
The proposed project, La Costa Estates North, is located in the
southern portion of the City of Carlsbad. The property is situated
west of San Marcos Creek Canyon and southeast of Alga Road between
two San Diego Gas and Electric easements which form the northern
and southern boundaries of the property.
a. Topography
The project site is a 140 acre irregulary shaped parcel oflapd.
The topography 'is characterized by broad round-topped ridge~. Two
large gullies drain the site toward the south. One gully is located
at the center of the site and the other is located on the western
,boundary of the site. Elevation on the site varies from 480 feet at the
north-central portion of the site to 110 feet at the southwest corner.
b. Land Use
There are a number of dirt roads on the project site. These roads
provide access to the San Diego Gas and Electric power lines which
traverse the site. The area has not been used extensiilely by off-
road vehicles and large areas remain in a natural state.
The project site is bounded 'on the north by La Costa Meadows
Unit no. I, a residential development of single-family units (zoned
R-I-lS, 000). This development has already been completed.
To the northwest of the proposed site are located a water tank
maintained by the Carlsbad Municipal Water District and a lot for a
future sub-station of the San Diego Gas and Electric Company.
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The land south and east of ,the proj ect site is currently un~ev~lop.ed
(zoned PC RDM), but is planned for development as part of the La I
Costa Develcpment. These undeveloped areas are known as Alicante
Hills and Alga Hills r~spectively.
The site is bounded on the west by San Marcos Creek Canyon,
a rugged natural area. Along the stretch, which extends upstream to
Ranch Santa Fe Road, San Marcos Creek flows through a spectacular
deep narrow canyon. The "V" shaped gorge is 200 to 300 feet deep
and has canyon walls as steep as 1.5 : 1 (horizontal to vertical)
and steeper.
c. Biology
The entire project site is characterized by vegetation composed of
coastal sage scrub. A brushfire burned over the proj ect site in Sep-,',
tember 1970. The coastal sage scrub vegetation is characterized by
California sage brush, California buckwheat, laural sumac, black
sage, and lemonade berry.
Two endemic species, or specie3s restricted to a particular region,
located on the site are the mis sion manzanita and the California
adolphia.
The coastal sage scrub generally supports a varied animal pop-
ulation which includes small animals and rodents, larger vertebrates
including predators, reptiles, and a variety of birds. The principal'
small mammals and rodents observed, or normally expected to be
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found in the coastal sage scrub are: ground squirrel, cottontail
rabbit, jackrabbit, pocket mouse, and other rodents such as wood and
Kangaroo rats. The larger vertebrates observed, or for which direct
evidence was found, include coyote, grey fox, badger, striped skunk,
and spotted skunk. Other larger vertebrates expected in this habitat
include raccoon and weaselo
No reptiles were observed during the biological investigation of
the site because of their restricted activity during the winter months 0
Reptiles to be expected in this habitat include rattlesnakes, gopher,
garter and King snakes, striped racers and several types of lizards I
toad s, and frog s •
Bird species observed in the coastal sage scrub include common
bushtit, red-shafted flicker, horned lark, Anna IS hummingbird, killdeer I
western meadow lark, California quail, common raven, roadrunner,
loggerhead shrike, swallow, California thrasher, brown towhee,
vireo, wrentit, and various sparrows. Additional species expected
to be observed on this site include preditory birds such as Cooperl s
hawk, red -tailed hawk I s parrow hawk, Swainson I s hawk, burrowing
owl, and the white-tailed kite.
No endangered species of plant or animal life were observed on
the proj ect site and none are known to be dependent upon the area.
do Geology
The project site is underlain by the Jurassic Black Mountain
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Volcanics I which are primarily fine-grained extrusive and intrusive
igneous rocks I grey-green in color I and of andesitic composition~
Typically I these volcanic rocks are closely jointed and weathered I
which greatly facilitates surface excavation.
The soil conditions encountered were basically a shallow layer
of gravelly clayey silt topsoil overlying the volcanic rock. This
volcanic rock has in the upper more weathered zones I decomposed
to a yellow-brown silty clay. Below the loose topsoil layer the soil
was generally firm with firmness increasing with depth.
There are no adverse geological conditions within the project
area which would preclude developmeOnt of the project# No evidence
of major subsidence or mudflows was observed on the site and none
are anticipated to occur during development. The only potentially °
active fault near the site is the Rose Canyon fault, located eight miles
southwest under the Pacific Ocean. No inactive faults were identifed
during the soil investigation of the site.
e. Archeology
An archeological investigation of the project site revealed the pre-
sence of no archeological resources. An examination of site records
at the Museum of Man revealed no sites were ever recorded on the
proj ect site.
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3.
f. History
A historical investigation of the proj ect site did not reveal the
existence of any sites of historical significance.
ENVIRONMENTAL IMPACTS
a. Land Use
The proposed project, La Costa Estates North, will allow 90
families to move into a modem residential development which uti-
lizes the best principles of land use and design. The maximum
allowable density for this development is 6.5 dwelling units per
. acre. The proposed tentative map and specific plan indicate a
planned density of only 1.5 dwelling units per acre. The density
of the proposed project is consistent with the allowable densities
indicated on the La Costa Master Development Plan, which was
approved by the City of Carlsbad.
. b • Geology-Grading
The nature of the soils found on La Costa Estates North are such
that they can support the proposed development. Grading of the lots
will occur only where neces sary to allow construction of streets.
Cut and fill slopes resulting from grading of streets will be planted
to stabilize the slopes and reduce erosion. Future grading will take
place when graded pads for residential units are constructed by
individual owners.
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Grading on this site will change the natural land form of the
project. The visual impact of the earth exposed by grading will
remain only until slope planting is established. No adverse effects
should result from grading of the site in accordance with accepted
engineering practices.
c. Biology
Development of the proj ect will require the removal of all vege-
tation from the graded portions of the proj ect site. Accompanying
this loss of vegetation will be the displacement of the present bird
and animal populations which currently occupy those areas of the site.
This wildlife will be displaced either to undeveloped areas on the
site or undeveloped areas off the proposed site. Much of the project
site will be retained in its natural state. The large residential lots
and the natural lots will provide a suitable habitat for the displaced
wildlife. Animals which can tolerate the presence of humans can
remain on the .'site. The two San Diego Gas and Electric easements
will serve as temporary homes for the wildlife until they are land-
scaped. The wildlife which migrates into the San Marcos Creek Canyon
will find a permanent refuge I as the canyon will never be developed.
No endangered species of plants or animals will be affected by
the proposed project.
New species of plants will be introduced into. the area through
landscaping of the proj ect site.
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d • Archeology
It has been determined that the proposed site offers no
archeological resource of any significant value, thus there will
be no archeological impact resulting from the development of the
site.
e. History
It has been determined that no historical sites are located on
this proposed development site.
f. Drainage-Water Quality
The drainage of the proj ect site will change from overland sheet
flow and flow in natural channels to flow in street gutters and in
underground storm drainage systems. Design of the drainage system
for the project will be in accordance with current standards of the City
of Carlsbad. Since a concentrated discharge from a storm drain -'oould
cause excessive erosion on the walls of San ,Marcos Creek Canyon,
the storm drain system will be designed to transport'water to the south
away from the canyon walls.
Runoff from the project site will increase with development. As
most of the site will be retained in its natural state, the increased
-runoff will be negligible. The total drainage area of Batiquitos Lagoon
is 52.3 square miles. The project site represents less-than 0.5 per
cent of the drainage area, so the effect of the increased runoff on the
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downstream environment will also be negligible.
There will be a minimal decrease in water quality because of
runoff from the project site. This decrease~inwaterq.uality is caused'
by various imparities such as hydrocarbons, fertilizers, dissolved
minerals and chemicals which are associated with runoff from urban
developments. This decrease in water quality is typical of urban
development and cannot be eliminated.
go. Traffic
Traffic in the La Costa area will increase as a result of the pro-
posed development. The project site is served by one:qlajorroute,
,Alga Road. Alga Road is designated on the Circulation Element of the
San Diego County General Plan as a major road. This road will be
102 feet wide and will carry an estimated ultimate traffic volume of
20 ,000 to 30,000 vehicles per day. From Alga Road, traffic will
travel east or west to EI Camino Real or Rancho Santa Fe Road for
further distribution.
The circulation system of La Costa has been designed to accommo-
date the anticipated traffic increase resulting from the proposed
development. The amount of traffic generated by La Costa Estates
North will be dependent on the nature of the residents of the project.
Residents will be primarily recreation-oriented, falling into several ,
broad groups including retired I second-home owners I and Single home
owners. Because of the various types of homeowpers I accurate
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traffic prediction would be difficult. An estimate of the increased
traffic Cal be made using an average of eight trips generated per unit
per day, resulting in an estimated 720 trips per day. The proximity
of commercial and recreational facilities within the La Costa De-
velopment would result in a shortening of the average trip length.
Traffic studies may be conducted to evaluate the changing
conditions of the La Costa street network as the need arises.
h. Noise
The existing noise level in the La Costa Estates North area is
low. Traffic on El Fuerte Street, Babelonia Street, and Alga Road is
the predominate noise source for the proj ect, but because of low
traffic volume on these roads, the noise impact on the proposed
development will be insignificant.
Aircraft overflight noise will occur occasionally, but it is not
. considered to be a significant factor. The development is outside
normal departure and landing paths for any existing or planned airport.
Noise from the contractors equipment and other construction
noises cannot be eliminated. This noise will be of a temporary nature,
lasting only until the proj ect is completed.
i. Air Quality
The increase in air 'pollution resulting from this project vvill be'
minimal 0 The main source of air pollution created by the proj ect
will be from motor vehicles. In comparison with the .total vehicle
emissions in the Carlsbad area, auto emissions and the resulting
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pollutants from this proj ect will be insignificant because of the small
number of vehicles involved. The quality of emissions from vehicles
cannot be controlled by the developer I but are regulated by State and
Federal standards.
Pollutants from the exhaust of the contractor's equipment will be
within existing emission standards and will be of a temporary nature.
j. Utilities
Utility service will be provided to all lots. Sewer service will
be provided by the Leucadia County Water District. The sewer
system for the proj ect will be connected to an existing sewer main in
the La Costa Golf Course.
Water service will be provided by the Carlsbad Municipal Water
District. Water service will be provided by an existing main which
runs south in El Fuerte Street from the La Costa Meadows Unit No.4.
.Gas and electric service I which will be provided by San Diego Gas
and Electric, is also located in El Fuerte Street. All utilities will be
placed underground to eliminate their visual impact.
k 0 Community Services
La Costa Estates North is located within the Escondido Union
High School District, The developer is working with the school
district to insure the· provision of adequate facilities for students
from the proj ect.
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La Costa Estates North is also located within the Richmar Elementary
School District. Elementary school sites a~e being provid~d withiI?-
the framework of the Master Development Plan for La Costa. Sites
for future construction ,of .eight ,elementary schools are included within
the Master Plan. Two junior high school sites will also be provided.
The Carlsbad Police Department services all areas within the
corporate limits of the City of Carlsbad.. At present, one' patrol car
is on duty 24 hours a day in the La Costa area. This patrolman would
also patrol the proposed site.
The City of Carlsbad Fire Department has a substation in La Costa
which will serve the proposed project.
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ANY ADVERSE ENVIRONMENTAL EFFEC'TS WHICH CANNOT BE AVOIDED,
SHOULD THE PROPOSAL .BE IMPLEMENTED
The unavoidable adverse environmental effects resulting from the
development of La Costa Estates North are typical impacts resulting
from construction of a residential development. There 'are no unique
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" adverse environmental effects which would result from development of
the" project. The adverse environmental effects of La Costa Estates
North are:
1. To decrease the amount of undeveloped land in the -Ci'ty of
Carlsbad by 140 acres.
2. A minimal decrease in water quality associated with urban
areas (hydrocarbons, fertilizers, chemicals, dissolved
minerals, etc.)
3. To increase traffic on El Fuerte Street, Alga Road, and
, other road s •
4. . A minimal increase in air and noise pollution associated with
the increased traffic.
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5. A temporary increase in noise associated with construction
of the proj ect.
6. A minimal increase in the demand for public utilities.
7. To decrease the available wildlife habitat in the area and to
displace wildlife from the graded portions of the project site.
Beneficial environmental effects resulti'ng form the development of·
the proposed project will be:
1. To provide 90 homes for families in the City of Carlsbad.
These homes will be located in the La Cqsta ,Planned Develop-
ment, which includes provisions for recreational, servi~e,
educational, and commercial facilities.
2. An increased tax base in the City of Carlsbad.
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30 . An improvement of access routes for fire and police prb-.
tection and an expansion of water service to the project site
and the surrounding area for fire protection .•
4. The long-term stabilization of the terrain resulting in reduced
erosion of the proj ect site.
50 A substantia! increase in the number of trees on the project
site.
6. An overall increase in vegetation on the proj ect site.
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' c. MITIGATING MEASURES PROPOSED TO ,MINIMIZE 'THE IMPACT
Various measures will be taken to minimize the environmental effects
of the proposed development. The most significant measure that will
be taken will be to confine the proposed project to the are.a west of
San Marcos Creek. The La Costa Land Company intends to make
San Marcos Creek Canyon (about 150 acres) availabe for preservation
for future generations.
By initiating protective conditions and deed restrictions, the
La Costa Land Company will insure that future construction within
the project will adhere to certain minimum standards. Conditions
such as prior approval of structure or landscape plans, and the
style, design, appearance and location 'of the plans will insure a
quality development. Other conditions include the exclusion of ex-
ternal television antennas I trailers I temporary building, boats, and
signs.
Grading of lots will only take place where necessary to allow
construction of streets. The natural vegetation of the area will be
preserved in the two park lots and in the 90 natural residential lots.
The retention of the San Diego Gas and' Electric easements as ope,n
space areas will provide a corridor for access of wildlife through
the development to San Marcos Creek.
An investigation of the project site was conducted to ~etermine the
existence of archeological or historical resources on the site. No
historical sites were discovered and no archeological sites were uncovered.
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All utilities, except the power lines in the San Diego Gas and
Electric easement, will be placed underground to eliminate their
visual impact.
Additional mitigating measures are the result of the total La Costa
Development Plan. Over thirteen percent of La Costa can be classified
as Open Space. Some of this area is' devoted to specific recreational
usage (the golf course, country club, spa, and riding facilities),
while most is left undeveloped to be part of an area-wide hiking,
equestrian, and picnic resource for the residents of the area. La
Costa also has provided approximately 200 acres of land for commercial
usage, including no acres for a regional shopping center.
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D. ALTERNATIVES TO THE PROPOSED ACTION
Many alternatives are always available regarding land use decisions.
The determination of the density of dwelling units and their relationship
to transportation facilities, utilities, community services, and other land
uses involves an infinite number of variables. One alternative which is
always available is to leave the property under private ownership in its
undeveloped condition. The property w.as originally purchased With the
intent of developing the land. Additional funds were expended in the areas
of engineering, planning, and City fees and assessments. The developers,
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unable to recover their investment from the property, would s'uffer"
financial los s •
None of the environmental impacts discussed in this report would
occur if the "no-project" alternative is selected o However, other impacts
would occur to the site through human and vehicular activity on the site.
This activitywou.ldresult in displacement of wildlife and disruption of
the vegetation.
A second alternative is public acquisition of the site to either retain it
as an open space area or develop it as a park. The San Marcos Creek
Canyon located to the north of the project is unusually steep, rugged,
and wild (particularly for a feature located this close to the coast).
The developer, recognizing the uniqueness of San Marcos Cr.eek Canyon,
has designed the total La Costa development to allow retention of
the Canyon in its natural state. No public agency has expressed the
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desire to purchase the project site for retention as open space or
development as a park. There is nothing unique about the project
that would require its preservation.
Any other form of residential development would have impacts
similar to the proposed projecto Development at a higher density
would place a greater demand on utilities and public services, and
more traffic would be generated. Development at a lower density
would require less utilities and public services, and less traffic would
be generated 0
Commercial or industrial development of the proj ect site would
not be consistent with the planned land use of the City of Carlsbad
or the La Costa Master Development Plano
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THE RELATIONSHIP BETWEEN LOCAL SHORT-TERM USES OF MAN'S
ENVIRONMENT AND THE MAINTENANCE AND ENHANCEMENT O·F
LONG-TERM ENVIRONMENTAL PRODUCTIVITY
The basic long-term effect of the proposed project on the en-
vironment is the loss of a limited amount of natural, undeveloped land
on the graded portions of the site. This loss is irreversfbleo Accom-
panying this loss would be the removal of a wildlife habitat. There is
nothing unique about the proj ect site wpich would require its. preservation
in its natural state. The proj ect will preserve in their natural state
two park lots and 90 natural residential lots.
The boundaries of this project were established to prevent encroach-
ment into the San Marcos Creek Canyon. Because the San Marcos Creek
Canyon is unusually steep, rugged and wild (particularly for a feature
. located this close to the .coast), it will not be developed. The La Costa
Land Company intends to make the canyon area (about 150 acres)
available for preservation for future generations.
The approval of this project is the commitment of the project site to
residential use. The project will permit a maximum of 90 families to
move into a modem I adequate housing development(if the lots are
developed to the maximum density allowed by the tentative map). The
predicted growth of the entire San Diego County area requires further
residential developmento Until growth of the population can be cQntrolled,
either expansion or congestion must occur.
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F. ANY IRREVERSIBLE ENVIRONMENTAL CHANGES WHICH WOULD BE
INVOLVED IN THE PROPOSED ACTION SHOULD IT BE IMPLEMENTED
The direct environmental effect of the proposed project is' the
commitment of 140 acres undeveloped land to urbanization. The
property will be altered to. accommodate residential housing and in the
process its physical and biological characteristics will be changed.
The indirect effect of the proj ect is the construction of housing
units and its resultant consumption of building materials and natural
resources. Public services and utilities will have greater demand
placed upon them.
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G. THE GROWTH INDUCING IMPACTS OF THE PROPOSED ACTIVITY
UPON THE NEIGHBORHOOD AND/OR COMMUNITY
The growth inducing aspects of the proposed La Costa Estates
North project reflect an orderly growth of residential land adjacent
to already developed La Costa residential property. Further growth
inducements occur on properties adjoining the subject property in
the same manner as the successful La Costa Development has already
induced the development of this property. Development of properties
now occuring to the northeast and south, notably the Lake San Marcos
project and the Village Park project in the Encinitas area, also have
growth inducing effects on the surrounding property. The rugged terrain
to the north and east of the La Costa development limit growth in
these directions. Denial of this proj ect would not appreciably diminish
the present growth inducements in this area.
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H. THE BOUNDARIES OF THE AREA WHICH MAY BE SIGNIFICANTLY
AFFECTED BY THE PROPOSED ACTIVITY
The boundaries of the areas which are affected by the project
are dependent on the environmental effect being considered. The
effects of traffic generated by this project and its air and noise
pollution problems are probably limited to a three mile range. Beyond
that limit, the traffic is sufficiently dispersed so that the effects
would be negligible.
. The effects of the proj ect on the biological component of the
environment will generally be limited to the immediate vicinity of the
project site, but may range as far as the Batiquitos Lagoon. The
'area affected by the changed visual appearance of the proj ect site
will be limited by the ridges to the north, south and east.
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1. CERTIFICATION OF ACCURACY AND QUALIFICATION OF INDIVIDUALS
PREPARING DRAFT ENVIRONMENTAL IMPACT REPORT
The information contained within this analysis is certified to be
accurate and correct to the best of my knowledge and belief, and
reflects the environmental impacts associated with La Costa Estates
North.
This report was prepared by Jeffrey Roy Lundstrom I Environmental
Consultant for Rick Engineering Company I consultant to the applicant,
La Costa Land Company.
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J. LIST OF ALL AGENCIES I ORGANIZATIONS, OR INDIVIDUALS CONSULTED
David D. Smith and Associates, Environmental Consultants
Walter R. Odening, Ph. D., Botany
David D. Smith, Ph. D., Geology
Ronald V. May, B. A., Anthropology
Benton Engineering, Inc., Applied Soil Mechanics-Foundations
Rick Engineering Company I Planning Consultants and Civil Engineers
La Costa Land Company
San Diego Museum of Man
Escondido Union High School District
Richmar Union Elementary School District
City of Carlsbad
Planning Department
Fire Department
Police Department
County of San Diego
Traffic Department
Planning Department·
Zoning Department
Leucadia County Water District
Carlsbad Mun~cipal Water District
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APPENDIX A
SPECIES LIST
Shrub I tree I and animal spe<;:ies observed (or to be expected based
on habitat -shown with asterisk) on the La Costa development property
are listed. The herbaceous dicot and grass species were not included
in this survey.
Shrubs and Tree s
California adolphis
* Broom baccharis
.bladder pod
~ Chaparral broom
California buckwheat
* beavertail cactus
* coastal barrel cactus
* cattail
_. San Diego ceanothus
* warty stem ceanothus
. chamise
: ' .. wild cucumber
chaparral currant
'deerweed .
elderberry
California encelia
. filaree
* California fuschia
haplopappus .
wild honeysuckle
lemonade berry
eastwood manzanita
mission manzanita
monkey flower
* mule fat
coast live oak
scrub oak
* pepper tree
California poppy
* rattle weed
redberry
* rock rose
Adolphia californica
Bacchari s s arothroide s
Isomeris arborea
Baccharis pilularis consanguinea
Eriogonum fasciculatum
Opuntia sp.
Echinocactus viridescens
Typha sp;
Ceanothus cyaneus
Ceanothus verrucosus
Adenostoma fasciculatum
Marah macrocarpus
Ribes malvaceum
Lotus scopavius
Sambucus mexicana
Encelia califomic9. _
Erodium sp.
Zauschneria californica
Haplopappus venetum
lDnicera subs picata
Rhus integrifolia
Arctostpphylos glandulosa
Xylococcus bicolor
Mimulus puniceus
Baccharis viminea
Quercus agrifolia
Quercus dumosa
Shinus molle
Eschscholzia californica
Astragalus sp.
Rhamnus crocea
Helianthemum scoparium
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Shrubs and Tree s (continued)
bush rue
black sage
*white sage
California sagebrush
* Spanish bayonet
Spanish dagger
laurel sumac
* thistle
tree tobacco
toyon
wire grass
Introduced:
eucalyptus
tecate cypre s s
Eurpoean olive
* sycamore
willow
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Small Mammals and Rodents
* southern pocket gopher
.. * pocket mouse
cottontail & brush rabbit
. jackrabbit
* kangaroo rat
* shrew
gro!lnd s::]:uirrel .
other rodents
Larger Mamals
badger_
bobcat
coyote
mule deer
* grey fox
* raccoon
spotted skunk
striped skunk
Cueoridium dumosum
Salvia mellifera
Salvia apiana
Artemisia californica
Yucca whipplei
Yucca schidigera
Rhus laurina
Cynareae gen. s p.
Nicotiana glauca
Hetermoles arbutifolia-
Junucus acutus
Eucalyptus SPa
Cupressus forbesii
Olea europaea
Platanus racemosa
Salix SPa
'Themys bottae
Perognathus SPa
Sylvilagus sp.
Lepus californicus
Dipodomys SPa
Sorex spo'
. Otospermophilus SPa
Peromyscus SPa
Neotoma SPa
Microtus sp.
Taxidea taxus
Lynx rufus .
Canis latrans
Odocoileus hemianus
Urocyon cinereoargenteus
Procyton lotor
Spelogale putorius
Mephitis mephitis
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* frogs
* frogs
e .
* coast homed lizard
* southern allig ator li.zard
* western fence lizard
* skunk
* garter snake
* gopher snake
* Jeingsnake. .
*'rattlesnake
* striped racer
* toads '.
* toads
Birds
mountain blue bird
common bushtit
* house finch
red-shafted flicker
* green heron
. Anna's hummingbird
killdeer
* kill.bird
homed' lark
western meadowlark
.. * Say's phoebe
California quail
common raven
road runner
loggerhead shrike
sparrows
* starling
. swallow
. California thrasher
brown towhee
vireo
wrentit
hyla sp.
rana sp.
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Phrynosama corona tum
Gerrhonotus .multicarinatus
Sceloparous occidentalis
Eu~eces sp.
·Thamnophis sp.
Pituophis melanoleucus
. Lampropeltis getulus
Crotalus s p.
Masticophis lateralis
Bufo sp.
Sca'phicpus sp.
SiaHa currucoide s
Psaltriparus minimus
Carpodacus mexicanus
Colaptes cafer
Butorides virescens
Calopte anna
Charadrius vociferus
Tyrannus sp.
Eremophila alpestris
Sturnella neglecta
Savornis saya
J.,o phortyx californicu s
. Corvus corax
G~ococcyx californianus
Lanius ludovicianus
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?onotrichia sp. I melospiza sp. I and others
Sturnus vulgaris
Hirundinidae gen. and sp •
Toxostoma redividum
Pipilo fuscus
Vireo sp.· .
Chamaea fasciata
Hawks I Owls I and Other Predatory Birds. Included:
Cooper's hawk
marsh hawk
red-tailed hawk
s parrow hawk
Swainson I s hawk
ACCipiter coo peri
Circus cyaneus
Buteo jamaicensis
Falco sparverius
Buteo swainsoni
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Birds (continued
white':"tailed kite
burrowing ,?wl
Elanus leucurus
Speotyto cunicularia
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HYDRAULIC CALCULATION
LA COSTA ESTATES NORTH
RECEIVE.D
MAR ~. 81914-.
CITY Of CARLSBAD. .
Engineering Oep'artment.
Prepared By:
Rick Engineering Company
509 Elm Avenue
Carlsbad, California 92008
January 15, 1974
Job Number 3978
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DISCHARGE
EXAMPLE:
Given: Q= 10 S= 2.5%
RESJOENTIAL STREET
ONE SIDE ONLY
.' .,
20 ·30.
Chart gives: Depth = OAI Velocity = 4.4 tp.s •.
SAN DIEGO COUNTY
DEPARTMENT OF SPECIAL DISTRICT SERVICES
DESIGN MANUAL
,"I '/ ,i 1/ . ~ __ . .,.,. APPROVED __ ~IV~,a~'~·c~.~~,~~,~>-~m~~~·4~~~'~~~{~~~X ________ _
GUTTER AND ROADWAY
DISCHARGE -VELOCITY CHART
APPENDIX X-O ':