HomeMy WebLinkAboutSEEPAGE MITIGATION TR 28214-5 ALBERHILL RANCH ROAD June 7, 2006
J.N. 160-04
Mr. Kevin Beals
CASTLE & COOKE ALBERHILL RANCH,INC.
17600 Collier Avenue, Suite C-120
Lake Elsinore, California 92530
Subject: Recommendations for Seepage Mitigation, Tract 28214-5 (Phase 5),
City of Lake Elsinore,Riverside County, California
Dear Mr. Beals:
Submitted herewith is Petra Geotechnical, Inc.'s (Petra's) summary of water-
seepage mapping and geotechnical recommendations for water-seepage mitigation
for various areas within Tract 28214-5 (Construction Phase 5), located in the City
of Lake Elsinore, California.
Areas of Seepage
In May 2006 groundwater seepage was mapped in localized areas in localized areas
of recently rough graded Tract 28214-5. Seepage was observed in the north-facing
fill slopes in the vicinities of Lots 16 through 22, 50, 61 through 66, 89, 155, 160
through 164 and 190 through 193. The seepage was emanated from relatively
clean coarse-grained fill materials which were underlain by finer-grained fill
material. It appears that a likely source of the groundwater seepage may have been
from infiltration of recent rains in March and April 2006, daylighting on the slope
face at the contact with the less permeable finer-grained fill layers. The location of
the water seepage was found generally at the toes of slopes, although portions of
Lots 160 through 163 and the adjacent portions of Cypress Circle were observed to
be saturated with localized ponded water. The general locations of the seepage are
shown on Figure 1.
CASTLE & COOKE ALBERHILL RANCH,INC. June 7,2006
TR 28214-5/Lake Elsinore J.N. 160-04
Page 2
Seepage Mitigation Recommendations
Subdrains are recommended in locations where water seepage was observed on the
slope face or at the toe-of-slope, as appropriate. The proposed subdrains will
typically be constructed along the slope face or toe-of-slope to a depth sufficient to
intercept the groundwater. Where subdrains are constructed at the toe-of-slope, the
subdrain should extend to a minimum depth of 3 feet below pad grade. Specific
depths of the individual drains shall be determined in the field by a representative
of Petra. The collected groundwater should be discharged into a permanent
drainage structure.
Subdrain Options
The specific design of the subdrains is variable, depending on the type of drainage
medium utilized. In order to obtain pricing options, Petra has included three types
of subdrains. These types are presented below.
Conventional Pipe and Gravel Subdrain — This design utilizes 3- or 4-inch
perforated plastic pipe encased in approximately 2 to 3 cubic feet of gravel per
foot, which is wrapped in filter fabric. The pipe is positioned at the bottom of the
gravel pack with the perforations along the bottom of the pipe. The gravel should
be either %- or 3/a-inch open graded rock. Filter fabric should be Mirafi 140N or
approved equal. The fall on the drain pipe should be a minimum of 1 percent.
The subdrain trench should be a minimum width of 12 inches and capped with at
lease 12 inches of compacted fill soils to reduce surface infiltration,
Miradrain G20ON Subdrain — Miradrain G20ON is a two-sided dimpled plastic
drainage panel covered on both sides with Mirafi 140NC non-woven filter fabric.
The panel should he placed in a trench of dimensions similar to that of the
conventional pipe and gravel subdrain. The panel should be positioned directly
against the uphill wall of the trench to intercept the seepage. A 3- or 4-inch
perforated pipe should be placed with perforations down along and in direct
contact with the bottom of the panel to function as a collector drain. The pipe
should be wrapped in filter fabric extending from the uphill side of the panel
around the pipe. The fall on the drain pipe should be a minimum of 1 percent.
The panel should extend to within 6 inches of the top of the trench. The trench
CASTLE & COOKE ALBERHILL RANCH,INC. June 7,2006
TR 28214-5/Lake Elsinore J.N. 160-04
Page 3
should be backfilled with on-site fill soils. No gravel is required. Additional
product information and installation recommendations are attached.
Mirafi HD Drain Subdrain—Mirafi HC Drain is a high-flow drainage composite
consisting of a 1-inch thick, three-dimensional, high-impact polystyrene core
wrapped with a non-woven filter fabric. The panel is installed in a fashion
similar to the Miradrain panel, except that a collector drain pipe is not required.
The collected water flows within the panel to a point of discharge. Because of
the lack drain pipe, the trench need only be 4 to 6 inches in width. Special panel
connectors are utilized to maintain flow and adapters are used to connect the
panel with the discharge pipe. As with the Miradram, no gravel is required.
Additional product information and installation recommendations are attached.
Trench Backfill
Subsequent to completion of subdrain installation, the subdrain trenches should be
backfilled to design grade with compacted fill. Fill soils should be placed in lifts
approximately 6 to 8 inches thick, moisture-conditioned and compacted in place to
a minimum relative compaction of 90 percent, utilizing appropriate compaction
equipment to prevent damage to the subdrain components. Subdrain installations
and fill placement should be observed,tested and documented by Petra.
This report was prepared in conformance with generally accepted professional
engineering practices and no further warranty is implied nor made, This report is
subject to review by the controlling authorities for the project.
CAST 1,11; & COOKE ALBERBILL RANCH,INC. June 7,2006
TR 28214-5/Lake Elsinore J.N. 160-04
Page 4
This opportunity to be of continued service is appreciated. Should you have
questions,please contact this office.
Respectfully submitted,
4�pFESS/p
PETRA GEOTECHNICAL, INC. 40 'C.o1y B.g,
ORIGINAL �h
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Grayson al GE EXP.
Principal Engineer r,
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Attachments: figure 1 —Seepage Mitigation ap
Mirafi product information
Distribution: (6) Addressee
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EXPLANATION SEEPAGE
(LOCATIONS ARE APPROXIMATE)
MITIGATION MAP
-.•.--- ••-.•---. PROPOSED TRACT 28214-5
SUBDRAIN
ZONE OF"SEEPAGE ! PETRA GEOTECHNICAL, INC.
DO
JN 160-04 JUNE,2006
FIGURE 1
Product Description
MI RA Fl .
Innovative Geosynthetics
l
product Mirafi® HC Drain
High Capacity Drainage Composite
i
Mirafil Construction Products offers a FEATURES AND BENEFITS wide trench using a standard trench-
wide range of moisture protection prod- Mirafi HC Drain's drainage capacity ing machine, The depth of the trench
ucts for a wide range of applications. is up to three times the flow of will depend on which drain width and
These materials are cost-effective ele- application. When determining the
ments which improve and enhance aggregate or sand assuring effective drainage. depth add an additional 3" for cover-
modem construction techniques. age over the drain, Place the Mirafi'
• Consistent multi-directional core HC Drain into the trench to fit against
PRODUCT DESCRIPTION configuration provides a uniform flow the bottom and sides of the trench.
path for water to escape.
i Mirafi' HC Drain is a high-flow Use the native soil as the backfill and
g • High compression strength to with- place in layers, compacting prior to
drainage composite consisting of a 1" stand overburden stresses. adding the next layer, Continue to fill
thick, three-dimensional, high-impact . Eliminates the need for bringing the trench until the desired height is
polystyrene core wrapped with a non- aggregate to the construction site, g
woven filter fabric. The filter fabric is obtained.
- Narrow trench required for
bonded to the individual dimples of the
installation. Connectors are also available. To
molded polystyrene core to minimize g
fabric intrusion into the flow channels . Native soil for backfilling. connect two rolls together, use the
caused by backfill pressure. The filter 'splice' connector, After placing the
fabric serves as a filter medium to pre- 'splice' over the two ends, use water-
vent the passage of particles into the CAUTIONS&LIMITATIONS proof tape to keep in place. Once the
HC Drain is placed in the trench,
core while allowing excess water to
Limit ultraviolet exposure by covering attach End Outlet to the end of the roll
pass freely into the drainage system. within 7 days of installation. Installer
fi®HC Drain is available in vari- to make the transition from HC Drain
The Mira should replace any panels damaged to a corrugated 4" pipe. The Side
ous widths: 6", 12", 18", 24", 36"
during installation. Mirafi HC Drain is Outlet is used to make line transition
(punched and non-punched) and 48" resistant to chemicals in normal soil
non from HC Drain for collection of water
( punched only). environments. However, some
along the drain length. A `ain to tw is
o outlet
reagents may affect its performance, available to branch one drain
Basic Use: Mirafr HC Drain is used in Ten Cate Nicolon representatives
place of traditional aggregate filled should be consulted concerning the other rolls. Make sure all connectors
are taped with waterproof tape.
french drain or trench drains. Mirafi" suitability of Mirafi' HC Drain in unusual
HC Drain is primarily used along roads soil environments, .
and highways as an edge drain as well These guidelines serve as a basis for
as on athletic fields, golf courses, play- INSTALLATION GUIDELINES installation. Detailed instructions for
grounds, airports and as foundation Mirafi'HC Drain can be easily installed installation and termination procedures
drains. using the following procedure: are included in the product packaging.
Dig a 4" (101.6mm) to 6" (152.4mm)
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HC Drain connectors Mirafi HC Drain
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! Ten Cate Nicolon
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Technical Data ,tVl / RAF j
Innovative Geosynthetics
product Mirafi® HC Drain
High Capacity Drainage Composite
Mirafi®HC Drain Technical Data
Property Test Method Unit Typical Value
Core
Composition HIPS
Thickness ASTM D 1777 in(mm) 1.0 (25.4)
Compressive Strength ASTM D 1621 psf (KPa) 9,500 (455)
In Plane Flow Rate' ASTM D 4716 gpm/ft (1/min/m) 21 (24,2)
In Plane Row Rate' ASTM D 4716 gpm/ft Q/min/m) 82 (94,6)
Filter Fabric
Grab Tensile Strength ASTM D 4632 Ibs (kN) 111 (0.49)
Puncture Strength ASTM D 4933 Ibs (kN) 70 (0.31)
AIDS ASTM D 4491 US Sieve(mm) 70 (0.21)
Water Flow ASTM D 4491 gpm/ft' (1/min/m') 140 (5698)
'Flow Rate Is tested at 10 psi(a gradient of 0.1 'Flow Rate is tested at 10 psi 0 gradient of 1.0
NOTE:48"wide drainboafd is non-punched,non multi-directional flow.
ROAD SHOULDER
ROAD PAVEMENT
ROADBED
HC DRAIN
TRENCH- .•y,-a- '
DIGATRENCH4-TOE •r�.IN WIDTHAND DEPTHAS
••r:.4:�
REQUIRED AND PLACE - -
HC DRAM TO FIT AGAINST
BOTTOM AND ONE SIDE-
RACKFILL WITH NATIVE SOIL
SOIL
www.mirafl.com
WARRANTY CORPORATE OFFICE
MAW Crilrslrrrallon Predicts asfwnes no IiaMfdy for the accuracy or L•arrpleleness of Iles hfvrmahion or for hire uhlimale use Iry 366 South Hollaml Drive•Per Kkxgraf=',GA 30567
titre purchaser- MIIW:r disdairns any and all vrf)ro-;s,anfAiad,w slalulory stun(Jartls,warms Rios or 9,Iar:aloes,indudOg will KxA 60
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of IrBda a;to airy ec7llpnerrl,materials,rx inlrxnrelirNl furrud>nd bonnvillt. This dorxlmanl stro ld not be Datalarod au onginaar-
irk advice.
LT.PDS.HC DRAI N.0604 �`
Tin Cate Nicolon
Product Description
i
Innovative Geotextiles
i
product G-Series Drainage Composites
for Retaining Walls, Cut-off Drains and Landfill Closures
i
MirafP Construction Products offers a wide withstands installation and in-sftu earth
range of geotechnical drainage composites stresses.
for civil engineering applications. These • Relief of hydrostatic pressure buildup
composites are cost-effective reinforce- against subterranean surfaces.
ment elements which improve and enhance • Cost savings thanks to the lightweight,
modem construction techniques in a variety easy to install 1.22m x 15.24m(4'x 50') 1'
of civil engineering applications, panels. This saves the transportation
cost of bringing aggregate to the con-
PRODUCT DESCRIPTION struction site. '
G100N Is produced from a high compressive
strength core with a Mirafi N-Series nonwoven APPLICATIONS
filter fabric bonded to one side. The G100W G100N and G100W products are designed ,
provides the added benefit of a Mirafl'Filter- for use in high4low, high compressive
weave'woven geotextile bonded to one side strength,vertical applications where single-
for higher clog resistance and long-term flow sided subsoil drainage filter layer is needed. `
capacity. The flat side of the core fits directly against
wall surfaces making It ideal for retaining
G200N,ideal for two-sided
drainage' Se applica
non- walls,bridge abutments and other similar Vertical Installation of G-Series
lions,is produced with a
retaining structures,
woven filter fabric banded to both sides of a
high compresslve-strength pierced dimple G20ON is designed for use where double- ..-.�. Wig ,
core, sided subsoil drainage filler layer is required.
G20ON is capable of collecting large quanti-
ties of subgrade water and conducting it to a
• Consistent and proven long-term per- discharge pipe or collection system. Ideal '`'
formance due to a multi-direcfional core npplications are placement against the exca- a
configuration providing a uniform flow vation cut of a retaining wall or slope,landfill
path for water to escape, closure interceptor drainage and in trench
• High-flow drainage capacity of up to drains. ,
three times the flow capacity of aggregate
or sand,assuring effective drainage for vir- INSTALLATION GUIDELINES
tually any drainage need. Detailed instaflation instructions are avail-
• High compressive strength core that able from your Mirafi'representative. Horizontal Installation of G-Series
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G100N G100W G200N
Ten Cate Nicolon
Technical Data
Innovative Geotextiles
product G-Series Drainage Composites
for Retaining Walls, Cut-off Drains and Landfill Closures
Property Test Method Units G100N G100W G20ON
CORE
Color -- black blaL* black
Thickness ASTM D 1777 mm(in) 10.16(0.40) 10.16(0.40) 10.16(0.40)
Compressive Strength ASTM D 1621 kN/m'(ps1) 862(18000) 862(18000) 862(18000)
Maximum Flow Rate' ASTM D 4716 I/min/m(gpm/ft) 260(21) 280(21) 260(21)
Installed Vertically' ASTM D 4718 I/min/m lgpm/!Q 155(12.5) 222(18) 155(12,5)
installed Horizontally' ASTM D 4716 11nWYm(Apm/Iq 30(2.4) 47(3.8) 30(2.4j
`in plane flow tested at l 73kPa(360opso with a gradient of 1.0.
2Instal4erl flow rate with soil or concrete overburden at verticalgred/erlt of 1.0,
,instalted Bow rate with soil overburden at horizontal gradient of 0.05.
GEOTEXTILE FILTER
ty,)Jta 011'GaotexYiJe _ - _ _ - -, 140NC_ _ Filterweave'402 _,_140NC_
MECHANICAL PROPERTIES
Grab Tensile Strength(MD) ASTM D4632 kN(lbs) 0,49(111) 1.62(365) 0.49(111)
Grab Tensile Strength(CD) ASTM D4632 I(N Rbs) 0,49(111) 0.89(2W) 0.49(111)
Mullen Burst Strength ASTM D 3786 kPa(psi) 1516(220) 3007(4W 1516(220)
Trapezoidal Tear Strength(MD) ASTM D 4533 kN(Ibs) 0.21 (47) 0.51 (115) 0.21 (47)
Trapezoidal Tear Strength(CD) ASTM D 4633 kN Obs) 0.21 (47) 0.33(75) 0.21 (47)
Puncture Strength ASTM D4833 kN(Ibs) 0.31 (70) 0.44(100) 0.31 (70)
UV Resistance after 500 hrs ASTM D 4365 %strength 70 90 70
HYDRAULIC PROPERTIES
ACS ASTM D 4751 mm(U.S.Seive) 0.212(70) 0.425(40) 0.212(70)
Permittivity ASTM D 4491 sec' 1.9 2.14 1.9
Flow Rate ASTM D 4491 I/min/m'(gpm/ftl 5698(140) 5907(145) 5698(140)
Percent Open Area COE-02215-86 % na 10 ne
PACKAGING
Roll Width m(ft) 1.22(4) 1.22(4) 1.22(4)
Roll Length Im(ft) 15.24(50) 15.24(50) 15.24(50)
Est.Gross Weight kg Qbs) 22.7(50) 22.7(50) 25(55)
Area - m2(ftj 18.6(200) 18-6(200) 18.6(200)
NOTE AIllnoixoties stlown are typical vatuos.
Retaining Wall Assembly Slope Retaining wall interceptor drain
� I•I r pp`t'. 1W5,+tilIH�45fr7@6 MIRAGRID SOIL
• .A-._tic OI MIRaN4T-TM EROSION -tip• IIEMFGR('EMFIJT
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F'LL.D SLOnE O1a� --X-tS-
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•1�% G20ON `CrIarJNEL 0
- rot FC1xN1ANI7 DRAINAGFGFONr-
il, ,• - 0130tAROF PIPE LEVELING PAD
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WAnnArm CORPORATE OFFICE
NORAR'GUnISMUCilon Products amanes no Iiabllly for Iha aa:tracy or completeness of this infumalion a for Ile ullimale use by 3&Soulh Noland Drive-Pendmgi w;.,GA 30%7
the ptuchasar. MIRAFI"dsdaimr,any and all evrmu.applied,of slalulury standards,warranties or guarantees,including without 088)795-0808-Q06)693-2226-Fax((06)093-4400
liinilalion any impried warranty as In marchantahilily or f lness(a a pariictAw purpose or arising from a course of dealing or usage
of trade as to a+>y eq+tprnenl,rnalsriafs,or Infcxmalion 1urilis41ed Ila'with, This dow)nenl shwld nut be cronslrued as elgineer- 421
ing advice.
f,PDS.FISFRIFS.G604
Ten Cate Nicolon
Installation Guidelines
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y.v«..f.L,1Ai• ,.,.wr.w..mutt
INSTALLATION GUIDELINES FOR
G-SERIES DRAINAGE COMPOSITES
Prepared by
Mirafi® Construction Products
,= =` 365 South Holland Drive
1 Pendergrass, GA 30567
Ten Cate Nicolon Tel: (706) 693-2226
Fax: (706) 693-2083
www.mirafl.com
January 2003
General
G-Series prefabricated drainage panels may be installed in a variety of construction
applications. They may be installed against retaining walls, lagging systems, buttress/
landfills, interceptor/edge drains and as sheet drains in reinforced soil structures. G-Series
Drainage Composites can be cut with a utility knife or scissors. Slurries, shotcrete or
concrete may be placed directly onto either side of the panels. Native soils can be used over
G-Series Drainage Composites.
Vertical Appftadons
The G-Series Drainage Composites panel can be installed in rows or columns with the
fabric side toward the soil. Each method has its advantages depending in the criteria of the
project as to which method is best.
When installing the G-Series Drainage Composites in rows:
Place the longitudinal edge of the core against the wall so that it is flush with the wall
footing.
• Attach subsequent panels in shingle fashion. It is acceptable to:
(1) place the longitudinal edge of the upper panel over the flanged longitudinal edge
of the lower panel;
(2) overlap the upper panel dimples onto the dimples of the lower panel by 50mm
(2").
When installing the G-Series Drainage Composites in columns:
• Start at the low point of the wall and attach the panel to the wall.
• Adjacent panels may be:
(1)joined together with the lateral edge of the connecting panel placed over the
flanged edge of the previous panel;
(2) overlap the dimples of the preceding panel onto the dimples of the previous
panel by 50mm (2"),
The geotextile from the adjacent panels should overlap the preceding panel. The fabric can
be adhered with liquid adhesive or duct tape.
The top or terminal edge of the G-Series Drainage Composites should be sealed by
applying a piece of filter geotextile sufficient in width to prevent soil or other foreign
construction materials from intruding into or behind the G-Series Drainage Composites
panels.
A "set back" or "ledge" condition may be encountered in some construction applications.
Where this condition exists, G-Series Drainage Composites panels should be installed
beginning at the bottom of the wall and ending at the ledge. Subsequent courses of G-Series
Drainage Composites should be installed flat against the upper wall portion and over the
lower edge. The overlapping G-Series Drainage Composites sections will be pushed flush
against the wall during backfilling.
Attachment Method- no Waterproofing Membrane used
The G-Series Drainage Composites should be attached to non-waterproofed walls with
contact adhesive, double sided tape or concrete nails. The G-Series Drainage Composites
will be permanently secured upon completion of bacicfilling. Backfilling should be placed
within two weeks. Backfill to at least 150mm (6") above the top edge of the G-Series
Drainage Composites.
Attachment Method- Soldier Pile Supported Excavations
The G-Series Drainage Composites should be secured with the appropriate fasteners for
the substrate, i.e. concrete, masonry, wood or soil. Prevent concrete from flowing behind the
G-Series Drainage Composites core by sealing the backside of the panel with duct tape or
wood furring strip. Voids in the soil or lagging that exceed 150mm (6") across and 125mm
(5") deep must be filled to provide support for the G-Series Drainage Composites,
HORIZONTAL APPLICATIONS
Concrete Lined Channels
Proper preparation of the subgrade will require grading to a 2% minimum slope. The area of
installation should be clear of rubble, rock, large soil clods, etc.
Place G-Series Drainage Composites with the fabric side toward the soil.
The flange of the second and subsequent panels should be placed over the backside of the
preceding dimpled core and butted as close as possible to the preceding panel. The panel
joints, longitudinal and transverse on the G-Series Drainage Composites core, should be
sealed with duct tape. This will aid in preventing concrete or soil from intruding into the G-
Series Drainage Composites core during subsequent construction phases.
Construction traffic should be minimized over the installed G-Series Drainage
Composites. Sand and/or concrete may be poured directly over the G-Series Drainage
Composites core.
Sheet Drains (Reinforced Soil Slopes and Walls)
Delivery. Storage and Handling
The contractor shall check the geosynthetic drainage composite upon delivery to ensure that
the proper material has been received. During all periods of shipment and storage, the
geosynthetic drainage composite shall be protected from temperatures greater than 60°, mud,
dirt and debris.
Placement
The soil surface against which the geosynthetic drainage composite is to be placed shall be
free of debris and inordinate irregularities that will prevent intimate contact between the soil
surface and the drain,
Seams
Edge seams shall be formed by utilizing the flap of geotextile extending from the
geocomposite's edge and lapping over the top of the geotextile of the adjacent course. The
geotextile flap shall be securely fastened to the adjacent fabric by means of a non-water-
soluble construction adhesive. Where vertical splices are necessary at the end of a
geocoinposite roll or panel, a 200-mm (8") continuous strip of geotextile may be placed,
centered over the seam and continuously fastened on both sides with non water soluble
construction adhesive. As an alternative, rolls of geocomposite drain material may be joined
together by turning back the geotextile at the roll edges and interlocking the cuspidations
approximately 50 mtn (2"). For overlapping in this manner, the geotextile shall be lapped
over and tightly taped beyond the seam with tape or adhesive. Interlocking of the core shall
i
always be made with the upstream edge on top in the direction of water flow. To prevent soil
intrusion, all exposed edges of the geocomposite drainage core shall be covered by tucking the
geotextile flap over and behind the core edge. Alternatively, a 300 mm(12") wide strip of
geotextile may be used in the same manner, fastening it to the exposed fabric 200 mm (8") in
from the edge and fold the remaining flap over the core edge. Alternatively, a 300 mm (t2")
wide strip of geotextile may be used in the same manner, fastening it to the exposed fabric
200 mm (8") in from the edge and fold the remaining flap over the core edge.
Repairs
Should the geocompositc be damaged during installation by tearing or puncturing,the
damaged section shall be cut out and replaced completely or repaired by placing a piece of
geotextile that is large enough to cover the damaged area and provide a sufficient overlap on
all sides to fasten.
Soil Fill Placement
Structural backfill shall be placed iinmediately over the geocomposite drain. Care shall be
taken during the backfill operation not to damage the geotextile surface of the drain. Care
shall also be taken to avoid excessive settlement of the backfill material. The geocomposite
drain, once installed, shall not be exposed for more than seven days prior to backfilling.
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