Specifications LAW /CRANDALL
A DIVISION OF LAW ENGINEERING
AND ENVIRONMENTAL SERVICES. INC.
i 17 \0
January 15, 1997
Mr. Brian Rager � kr� 4 S � ,
City of Tigard
•
13125 SW Hall Blvd. � � t �
Tigard, OR 97223 dr'� D� ��'� 'JAN 2 7 1997
� AR
Subject: Ryder Truck Rental . .. ♦ C ► OF. TIGARD
14750 SW 72nd „ \(1. t?'
Law /Crandall Project 70144 -6 -0385 41 \
Re: Request for waiver to construct a Water Quality Facility
� - � qto -cos
Dear Mr. Rager:
Enclosed with this letter you will find a copy of our drainage and pavement plans for the above -
mentioned project. Based on our evaluation of the options provided in the Unified Sewerage Agency
Design and Construction Standards, we are requesting for an approved waiver to construct a water
quality facility due to the following reasons. First of all the layout and topography of the parking
facility prevent us from installing a practical vegetated corridor and/or any type of ponds. In
addition the relatively small size of the parkin! e -- :.. es it ineffective to construct on -site facility.
The total proposed building and paved area 83 950 thout the alternate area as shown on the
pavement plan. Therefore based on these reasons we ould like to request a waiver for constructing
water quality facility on -site. We understand that a Sys em Development Change will be required if
the waiver is approved.
Please feel free to contact us if you have any questio ' regarding this matter.
Sincerely,
A. azen Wahbeh Richard C. Leach
Senio ngineer PrincipalNice President
AMW/bv
B96-Proj \603: 0385.114 - '/4 _Llt3 � 5 T1 S
Attachments 2 aatior ki. L JZ AL- 121�1e (6,4r4.!1 a t
Tr .S T T c L
(1 copy submitted) _- - `S n ( � f
{
cc: Ryder Truck Rental, Inc. G-,r t P f - 6�S
Attn: Mr. Adrian Grimes 4a4/.§ A/
Hal's Construction
Attn: Mr. Phil Hickman 64
200 CITADEL DRIVE • LOS ANGELES. CA 90040 -1554 /
(213) 889 -5300 • FAX (213) 721 -6700 1 / ZL{ bq
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8
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-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 1
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Existing t .
Catch Basin PROPOSED X CONCRETE SWALE v
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Existing Catch Basin
Y Top of Rim El. = 164. f /87F 1 8 bpe PV4 '
= PROPOSED CATCH BASIN # 2
0 4 — 1 /8 "/Ft. stove Inv. Elev. = 166.59
PROPOSED CATCH BASIN #3 k---- s
eqr III Inv. Elev. = 165.13' 1 ` ,7 Barricade Slope surface toward Q [I
J D `4Existing Catch Basin Fuel Tank (Fuel Tank / 3' concrete Swale Y
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ii
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ci Concrete Canopy t
Existing Concrete
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Bench Mark top a Conereta Slab �..: Existing I Q
at eev. = 170.78 NW inside caner
Z 1 a arTrete Plant Box Catch Bali Excavate depressed area to solid material. Q
N Oregon State Highway Dept Datum �� �� Backfifl with soil & compact in 6" layers.
5
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12"OR PVC '
3 Concrete -_ _ W CD
o Driveway
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cii Concrete > 0 t 1/8 " /Ft. slope
Cutout
Existing Catch Basin T EXISTING • PROPOSED CATCH BASIN #1 Existing Concrete ' US
co , MAIN BUILDING = Inv. Elev.= Retaining Wall
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NOTES;
p • Catch basins and pipes shall comply with Oregon Speciality Plumbing Code Section 1408
Ps- specifications and shall be trapped by using an inverted one-quarter bend or welded baffle
m • Elevations and grades shown on this drawing are for general guidance. They may be modified
REVISED 12/23/96
in the field to insure drainage D RAI NAG E PLAN
• Contractor shall comply with Oregon Standard Specifications for Highway construction V , � RYDER TRUCK FACILITY
• Polyvinyl Chloride Pipe (PVC) Pipe shall be used for storm drains and shall meet the requirements 14750 SW 72ND AVENUE
of ASTM C -900. The minimum cover over the top of the pipe shall not be less than 18 inches.. TIGARD, OREGON
Where the backfifl cover over the top is less than 18 inches use class A bedding and encase the
entire circumference of the pipe with a minimum of 6 Inches of concrete. The concrete shall comply I 0 40 80
with section 00440 -Minor Structural Concrete and bedding and back fit shall comply with section REFERENCE: _
00405 of the Oregon Standard Specifications for highway construction. ALTA/ACSM Land The Survey (dated 3/17/95) by Scale Feet A
a
� Not to be constructed
� 4" wide painted line, typ.
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co 38" w ide ramp t : _ { 1
10' 1:12 max. slope 10 - _� 50 ' -0° ) 21-0 - - - - - - -
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a 18-6" 4 -s-
paces 8 fi 8'-0" — -- -- - - -- -- -- -- --
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U ` REVISED 12/23/98
:':'.4: NEW PAVEMENT
° y PAVEMENT PLAN
�` AREA TO BE BI AS AC r/J rtER NOTES:
REFERENCE; 14750 SW 72ND AVENUE
REMOVE EXISTING ASPH CONCRETE TIGARD OREGON
ALTA/ACSM Land Title Survey (dated 3/17/95) by
j::::::::::::::: AND REPLACE V1ATH NEW PAVE MENT TOTAL AREA OF PROPERTY 2.825 ACRS OR 123,085 SF T Global Engineering, Land Su rveying and Planning Co. __ ,
' —_ _' TOTAL B AND PAVEMENT AREAS -.83 .� ,..
0 40 80
— == NEW 4 INCH PCC SPILL PRO TECTION APRON 800 T.E. AL RN *�E
If
TOTAL LANDSCAPE AREA 39,115 W ALTERNATE Scale Feet
uetinirea nF�.l OA[ AISLE 28,265 WITH ALTERNATE
LAW / CRANDALL