HomeMy WebLinkAboutParcel Map 18022 Parcel 4 Soils Report (Liefer)
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PREUMINARY SEWAGE DISPOSAL INVESTIGATION
5.0+ 1- Acres, APN 957-()9().()23
Parcel 4, P.M. 18022
NEC Nicolas & Uefer Roads, Temecula
Riverside County, California
Project No. 22586-02
December 23, 2002
FIRST PLAN CHECK
PREPARED FOR:
RECEIVED
JAN 0 6 2003
CITY OF TEMECULA
ENGINEERING DEPARTMENT
Lorin Phipps
28745 Old Town Front Street, Suite D
Temecula, California 92590
Earth Technics P.O. Box 891989, Temecula, California 92589 (909) 699-5451 FAX (909) 767-1193
\
December 23, 2002
Project No. 22586-02
Lorin Phipps
28745 Old Town Front
Temecula, California
street, suite D
92590
SUBJECT: ON-SITE SEWAGE DISPOSAL INVESTIGATION
Single-Family Development,
5.0+/- Acres, A.P.N. 957-090-023
Parcel 4, P.M. 18022
NEC Nicolas , Liefer Roads
Temecula, Riverside County, California
INTRODUCTION
In accordance with your authorization, we have performed a sewage
disposal study on the subject improved lot to evaluate the
feasibility of an on-site sewage disposal system utilizing the
septic tank/leach line method. The scope of our work included:
(1) site reconnaissance by our geologist; (2) excavation of 1
deep exploratory trench in the vicinity of the proposed system
(the trench was logged by our geologist and this log appears in
Appendix A); 4 shallow leach line percolation tests; and (4)
preparation of this report presenting our findings, conclusions
and recommendations for a system design for the proposed 3-
bedroom house
Our investigation and this report have been prepared in
compliance with the format set forth by the County of Riverside,
Department of Health, Division of Environmental Health. A
discussion of the testing procedures are discussed further in
this report.
The 100-scale assessor parcel map was used to guide the location
of our testing and plot our geotechnical data. At the time of
our testing, several property corners had been surveyed, and the
site is partially perimeter fenced. Our geotechnical data is
shown on Plate 1.
ACCOMPANYING MAPS. ILLUSTRATIONS AND APPENDICES
Location Map (2000-scale) - Page 2
Plot Plan (40-scale) - Plate 1
Typical Leach Line Detail - Plate 2
Appendix A - Geotechnical Trench Logs
Appendix B - Percolation Test Data
Appendix C - Laboratory Test Results
~
INDEX MAP
o
2000
4000
N
SCALE
INDEX MAP
feet OF
5.0 +/- ACRES, APN 957-090-023
PARCEL 4, P.M. 18022
NEC NICOLAS & LIEFER ROADS
TEMECULA, CALIFORNIA
SOURCE:
'3
U.S.G.S. 7~ MIN QUAD. BACHELOR MTN. 1953 (PR 1973)
22586-02
Page 3
SITE DESCRIPTION
The 5.0+/- acre roughly rectangular-shaped lot is located at the
northeast corner of Nicolas and Liefer Roads, improved paved
roads in the Temecula area of Riverside County.
The lot is bounded by Nicolas Road to the south, Liefer Road to
the west, an existing house to the east, and vacant land in all
remaining directions. The proposed cul-de-sac Indian Summer Road
is proposed along the northern property line.
The site has been disced for weed control and is weed free.
Several building pads have been constructed of cut and fill on
the north as shown on Plate 1. The entire southern 1/2 of the
property is included within the flood plain for the Santa
Gertrudis Creek which crosses the southern portion of the
property.
The geographic relationship of the property to the surrounding
area is shown on the Index Map.
PROPOSED DEVELOPMENT
The 5.0+/- acre lot will be developed with a 3-bedroom
manufactured home and attached garage at the location shown on
Plate 1 adjacent to the nearly flat along Liefer Road. The
approximate driveway access will be provided from Liefer Road as
shown on Plate 1.
Minor grading with cuts and fills on the order of 2 feet to
flatten the pad and improve driveway access is anticipated. On-
site sewage disposal utilizing the leach chamber/septic tank
method is proposed on the cut portions of the existing larger cut
and fill pad to the southeast of the building location.
Water will be provided utilizing pressurized pipeline.
FIELD EXPLORATION
Shallow subsurface exploration of the site was performed on
December 12, 2002. A case 580 Super L backhoe with a 24-inch
bucket was used to dig the shallow percolation test holes and
deep exploratory trench. The deep trench was logged and sampled
for soils information, and this log appears in Appendix A.
~
22586-02
Page 4
SUMMARY OF TEST PROCEDURES
The 13-inch deep leach line test holes were excavated utilizing a
post-hole digger in the bottom of the backhoe trenches. The test
holes were presoaked utilizing the continuous presoak method
adopted June 1988, which is as follows:
A completely filled 5 gallon was inverted over the test hole
so that a continuous level of water was maintained up to a
height of 8 inches above the bottom of the hole. When the 5
gallons of water has completely percolated within the test
holes, the empty bottles are removed and the holes are
refilled to 8 inches above the bottom of the hole. All 5
gallons of water must infiltrate, or the holes must be
presoaked a minimum of 15 hours if less the 5 gallons
infiltrates. Four or more consecutive measurements are
taken at time intervals that provided not less than 1 inch
or more than 3 inches of drop. All measurements were taken
to the nearest 1/8 inch and the difference between the last
two measurements did not vary by more than 20 percent.
Percolation testing was performed on December 12th and 13th,
2002. The testing procedure was performed in accordance with
Riverside County Health Department guidelines. The shallow leach
lines were tested in accordance with the "continuous Presoak"
method.
SUMMARY OF FINDINGS
The area of the proposed sewage disposal location has been graded
with cuts and fills to 16 and 12 feet, respectfully, to create a
flat pad. The cut portions of the pad proposed for disposal are
underlain by the interbedded sedimentary bedrock of the pauba
Formation. The weakly cemented bedrock consists of silty
sandstone (50%), clean and clayey sandstone with 2-5 percent
rounded cobbles and pebbles to 2 inches in diameter. Portions of
the sandstone (10%) are clean and non-cohesive. No refusal was
encountered to a depth of 15.3 feet. The leach line percolation
rates were variable from fast to moderately fast between 3.03 and
18.47 minutes/inch.
GROUND WATER
Ground water was not encountered during our investigation to a
depth of 15.3 feet. The depth to historical ground water
elevations are at least 55 feet below the ground surface based on
down hill private wells to the north and south bracketing the
property (DWR, 1971). The nearest private well to the southwest
has ground water at 78 feet currently.
~
22586-02
Page 5
FLOODING
According to the Riverside County Seismic and Public Safety
Element, and the Federal Emergency Management agency, the
southern 1/2 of the site does lie within the boundaries of a 100
year flood plain for Santa Gertrudis Creek. The disposal area is
located on a graded pad that is over 80 feet horizontally, and 12
feet vertically above the flood plain designated on Plate 1. No
flooding potential exists in the area of disposal.
PERCOLATION TESTS - LEACH LINES
A total of 4 shallow percolation tests were performed in areas of
the lot as shown on Plate 1. A summary of test results is
presented -in Table 1 below, and the field testing sheets are
included as Appendix B.
TEST
NO.
P-l
P-2
P-3
P-4
TABLE 1 - SUMMARY OF TEST RESULTS - LEACH LINES
EARTH MATERIAL
TESTED
DEPTH OF
TEST
(INCHESl
APPLICATION RATE
(SQ. FT. PER
100 GALLONSl
RATE
(MIN/INCHl
Bedrock-Pauba Fm
silty fine sandstone
with minor gravel
9.60
25
47-55
Bedrock-Pauba Fm sl. 40-48
silty sandstone soft
portions clean + gravel
3.03
20
Bedrock-Pauba Fm 51-59
silty sand w/fine
gravel + sandy silt
18.47
45
Bedrock-Pauba Fm 44-52
silty sandstone sl.
silty sandstone fine -
medium + gravel
9.13
25
LABORATORY TESTING
Grain size analyses were performed on a representative samples of
the on-site material at 10-12 feet from the ground surface. The
results indicate that the percent fines (smaller than 0.074mm;
passing No. 200 U.S. Standard sieve) is 36.2 percent.
CONCLUSIONS AND RECOMMENDATIONS
Conclusions:
1. Based upon the results of this investigation, on-site sewage
disposal utilizing septic tank/leach line method of disposal
is geotechnically feasible on the lot.
G,
22586-02
Page 6
2. Based on the findings of this investigation, it is judgement
of this engineer, that sufficient area exists in the area of
the parcels tested on the property to allow installation of
an adequate on-site disposal system and a 100 percent
expansion area, based on typical 3-bedroom development.
3. The information accumulated during this investigation
indicates that ground water, perched or otherwise, is more
than 5 feet below the bottom of the recommended systems and
will not encroach within the allowable separation distance
of 5 feet below the leach lines. Historic high ground water
is anticipated at 50 feet below the disposal area.
4. Sufficient fines (36.2%) exist in near surface soils to
provide adequate filtration and to protect ground water.
Recommendations:
1. We tested leach lines to rate of 3.03 - 18.47 minutes/inch.
utilizing the slowest rate tested of 18.47 minutes/inch is a
design rate of 45 square feet/100 gallons of septic tank
capacity.
2. Assuming a 3-bedroom house, the minimum septic tank capacity
is 1000 gallons.
3. Using a 1000 gallon septic tank and an application rate of
45 square feet is 450 square feet of absorption area
required to effectively handle the anticipated effluent.
4. utilizing leaching chambers is 120 linear feet of 3-foot
wide leaching chamber. Conventional leach lines with 1 foot
of rock would require a total of 150 linear feet of 3-foot
wide leach line.
5. There is sufficient area on the lot to properly dispose of
on-site effluent, provided sufficient area is set aside on
the lot to discharge effluent to the proposed field by
gravity flow, unless otherwise approved.
6. Ground water is not expected to encroach within the
allowable safety limits set forth by the County of Riverside
and is more than 45 feet below the bottom of any disposal
system.
7. The system should be installed in accordance with current
UPC codes. A typical design is shown on Plates 1 and 2 with
the required separations.
1
22586-02
Page 7
Respectfully Submitted,
Larry J. Fast, RC
Registration Expir
services
~
REFERENCES
county of Riverside Department of Health, 1981, "Waste Disposal
for Individual Homes, Commercial and Industrial Booklet".
DWR, 1971, Water Wells and Springs in the Western Part of the
Upper Santa Margarita River Watershed, Riverside and San Diego
Counties, California, Bull. No. 91-20, 378 pages
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APPENDIX A
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Project Number
Project Name
Equipment
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GEOTECHNICAL TRENCH LOG
22586-01/02 Date 12/12/02
Phipps Elevation 1188 +/- Trench No, T-l
Case 580 Super L Backhoe
~ - B
t) ii Geotechnical Description.
'" - '~ OJ
~ B
.f' .5 Logged by: W,Sherling
U S0 1;j
~ " ~"l
~ B -u ::E
~ u ' ~
8 ,- ~ _<IJ Sampled by: W,Sherling
o~ ~~
::E~ i'l
9:1-...______
.
SC-2 S04
5-
6-
7-
8-
9-
lO-
ll-
12-
13-
14-
15-
16-
17-
18-
19-
SM
115..0
(92,1
4.3
117.3
(93,9
5.1
SOIUCOLLUVIUM - Light yellowish brown 10
YR 6/4 silty fine medium sand with minor fine
gravel. Soft, dry, porous, Sandy silt at lower
contact, Gradual lower contact,
BEDROCK- PAUBA FORMATION - Verypale
brown 10YR 7/3-8/2 interbedded sandy siltstone
(20%) and silty sand stone with minor fme gravel.
Thick beds of sl. silty to nearly clean uniform
medium sand stone with gravel (25% overall).
Dense to very dense, sl. damp, Occ. thin interbeds
1-4" thick of clayey sand at 8'+.
T,D. lOA Feet
No WaterlMottling
\'?
Project Number
Project Name
Equipment
j
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0-
1-
2-
3-
4-
5-
6-
7-
8-
9-
lO-
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GEOTECHNICAL TRENCH LOG
,22586-01/02
Phipps
Case 580
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12-
13-
14-
15-
16-
17-
18-
19-
B
U
L
K
Date 12/12/02
Elevation 1175 +/-
Super L Backhoe
Trench No. T-2
5 6 Geotechnical Description'
~ '~ OJ
U S0 .~ Logged by: W,Sherling
" 1a"l ::E
a -u
u ' ~
~ - '" Sampled by: W,Sherling
,~ ~
~~ '6 ;:i
"'~ Ul
SMlSC
BEDROCK-PAUBAFORMATION- Yellow
JOYR 7/6-7/4 interbedded silty sand (70%) and
sandy silt. Weakly cemented sandstone with minor
fine gravel to 114", Portions of clean sandstone are
non-cohesive caving, Moderately dense to dense,
sl. damp, Occ, thin interbeds at 7'+ of clayey sand,
T,D, 15,3 Feet
Water/Mottlin
\A..
APPENDIX B
\~
--
TEST HOLE NO,: 1'-1 DATE EXCAVATED' I'Z-/O./".... SOIL DESCRIPTION: &'..n,LoG/'- A..I.2. h..-.Jii{.
DEPTH (Inches); 47- 55 ~ .Ii!~/(,,,h,N."MIM aJ1>VjA-
TESTED BY: 1-1 'bho II;" 'T PERIOD (/
PRESOAK
Time/Date 11me Interval of Presoak Water Leftl Comments:
5T.\I1T_ I: 4D I'M 12/17/u'1-- "').7-/'14 Ilm'/J fh.. 1/1.< ql IwU .t.nr'4- t
STOP _ /1;[, ffM h/t;'!oy
TEST PERIOD
INTlAL WATER FlI\IAl WATER WATER LEVEL DAOP PERCOlATION RATE ~ CHANGE fROM LAST
TIME TIME INTERVAL IMlN) LEVEL (INCHES) LEVel clNCHESI (INCHESl 1~!NCHI PERCOlATION AATE
~~ 15/.' 7/" '. 1 '
l/:-r;, "'- 7fJt/'._/?- /Jc<:.... 7, z- z-- P
II; S''i 06
II:S'loO 15M<. 2.2,-,-<-- 'i)" 7 .. I" fj,37
/2- 06'Z-- 11-/ &,
12.-0$3(, EM''- C.1/4<c.. -z, /." 7//1," I"
'2- 8 '7 (,.
12' 17~
'2' IS 00 )' ----- -- ----,
9m-~~;',6 -:lee Sk" 7/. .. ,.- 9 (p
7
12 .Z7'5~ ~ ~
TEST HOLE NO,: 1- 7 DATE EXCAVATED: 17-/n/07- SOIL DESCRIPTIDN'; !.€.(}I2<QL- fau)... hn-,/
DEPTH lInches): ,,/-()-C; i? \',)~ Si:i NirhN. Sol f ,PNri,.IJ;"" 1'1, A.... -t-9 rlSvd
TESTED BY: il,<:' _ i !'-, ~
.. PRESOAK PERIOD 0 '
Time/Date Iv/rl- /0 J.... TIme Interval of Presoak Water Leftl Comments:
STAAT_ 2:0<; PM '2/IVkJ 57 rYJ./ ~ ,11., -f/-!; l' Pi.W Ph"") _ d ,~
STOP - IZ;Ol...fJM !?-/tJ jD'J.- ' , '/
TEST PERIOD
NTlAl WATER FINAL WATER WATER LEVEl DROP PERCOLATION RATE "4 CHANGE F'ROM LAST
"ME TIME INTERVAL IMlN) LEVEL (INCHES) LEVEL lINCHES) (INCHES) (MIN/INCHI PERCOlATION RATE
I C" r-t
I:! & " 7" I ,
,'C_ .?m-~9/.1_<'
? .1-:0 P
12. ()t/ 't...
12 ; tvl !t l"~:",,, Z2'4..-C-<, S" 7" I"
2 ,,17 13
12 07C'(,
12 0726 '/ ' /Ii 7'~c:.. (,.'1,; ( . $
'2."D c'~ ./.}tl.,-.I, /'tlc 273 10
-
:!: 10 3' ------ ,) ------ ~
7/5- c... )If: " I' '"
3H"\.kZ-1_~c.... 3 0.3 10
'2: 13 ::7 ----- ---
\Cp
EARTH TECHNICS
W,O, NO,
--- -~--- -----"- --~--
TEST H OLE NO,: P --'; DATE EXCAVATED: 12-//~/O2. SOIL, DESCRIPT!ON: ~,P60''' - jJ",,G., ~;.,; o,/-j
DEPTH (I nch..l; 5/ - c;q .stl~""/ 1//1.1 f~v.tl-f """'P JI#
TESTED BY: II. n '^ ti'", 1,
PRESOAK PERIOD 1/
n.-nSt Oa;:e TIm. Interval of Presoak Water Left/Comment.s:
51A"1_ '2: I D 1M Iz/Z;bz- 7/ /vJ.:; s (, nw" 8.1% IM~-r/~
STOP- /2 :O/:, 1M 1'1-1/';/07-
TEST PERIOD
NTlAL WATER FINAL WATER WATER LEVEL DROP PERCOlATjQN RATe "'I. CHANGE FROM: LAST
TIME TIME INTERV....L (MIN) lEVEL flNCtES) LEVEL IIr\lCHES) (INCHESl (MlNlINCHI PERCOlATION RATE
II Ch 2.7 'P! " 7'/4 '. I'
911(1' - ~ 9, 2S- y:f
HZ J~4_",c
17 '/5"
12 l{y 10 11.,;c S'O"u '" /, ' 7/~" !"
v , Ii-?'~
22.
00
tl:2S
12:2~ zo IfJ"",: 87 ~<c.. ~/..," 1 'J..', I 15.' uz. &
12 "IC: <::7 2LJ
12:4UC/ - .-
-
"," 7 " / , /
t rJ ~';"?fJ 1l.L-c.. D ~ " J 8, ''17 1;;- , \
I' 02 ,8- \ /
TEST H OLE NO,; p-" I DATE EXCAVATED; l't /1'-'/01.- SOIL DESCRI~TION': ,{}/9)/l-OO<- fJrJ!U;" r,.,., Oilf
DEPTH !Inch.s): 4A -:57-- s,?...,lolw .r(1)/~ "'IM(';"/V-h"'-n-N~9j""...A
TESTED BY: Ii ,<;, ,- (I.'~) , /
PRESOAK PERIOD
Time/Date Time Interval of Presoak Water Left! Comments:
START _ rz;n fJfVI 17../0/07.-- '2-?--/v'w b~ 9n1/I/ ,; ,.{J, C'h"/7~_ if:;
. "
STOP - 12; 23 f/vi 12! 13/07.--
TEST PERIOD
:/'.llTlAL WATER FINAL WATER WATER LEVEL DROP PERCOLATION RATE ~ CHANGE FROM LAST
r..... TIME INTERVAL IMlN) LEVEL [INCHES) LEVEL (INCHES) (INCHES) IMlNflNCH) PERCOLATION RATE
I ., ~ Z'J
IZ ~~ ~ .. T I' 5,3 y5
r If _-;1,e c
v#tr.
/Z: Z15 ~IL-
IZ.'2-'loS- (/JI'H- Z2.....Le; '01." "7 I.;,' I '
12: lea, (;'-17 1'0
IZ:!'-o fi'~ 'S.. 7" I" ~
g"",,&~ i, I Z-o
12.:43 :)J
12:4lf3'1 IV .. . .. y
.. ..
CJ ~ S'-dL-L. sit" 7'4" 9 Jj
12.:53qZ. \...
,,"
'\
:\
W,O, NO,
EARTH TECHNICS
APPENDIX C
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