07/11/1972 - Packet TIGARD WATER DISTRICT 913419. W. COMMERCIAL ST.
- TIGARD, OREGON 97223
PHONE (503) 639-1554
July 11, 1972
AGENDA
CALL TO ORDER
1. RESOLUTION TO APPROVE MINUTES OF LAST MEETING
2. VISITORS
3. RESOLUTION TO PAY VOUCHERS
4. RESOLUTION TO APPROVE REVISED RULES, RATES, AND REGULATIONS
*ow 5. RESOLUTION TO PURCHASE 2.87 ACRES OF LAND AT 125th AND GAARDE
ON A CONDITIONAL BASIS FOR FUTURE TERMINAL RESERVOIR SITE
6. RESOLUTION TO RAISE ELEVATION OF RESERVOIR #3, LOCATED AT
135th AND FERN STREET, BY 12 FEET
7. RESOLUTION TO AUTHORIZE METZGER WATER DISTRICT TO SERVE DOMESTIC
WATER TO OREGON TORO AND HYSTER COMPANIES FROM THE 12" FIRE
PROTECTION MAIN LOCATED ON 72nd AVENUE
8. RESOLUTION TO CREDIT ONE METER INSTALLATION CHARGE, $225, TO
MISS LEAH ZEDNICK, 13995 S. W. BULL MOUNTAIN ROAD
9. RESOLUTION TO APPROVE ANNEXATIONS
10. OTHER BUSINESS
ADJOURNMENT
NOW
ADMINISTRATOR'S REPORT
1. Resolution to approve minutes of last meetinss.
2. Visitors.
The Tigard Evangelical Church is presently constructing a new
church building on S. W. 121st Avenue, north of Manzanita Street.
They have completed the installation of an 8" main with fire hydrant
to the site. Rev. Roger B. Swaren indicates that the church council
desires to install a 1" meter, and objects to the requirement of an
11" meter. Our computations indicate that at least an 11" meter should
be installed, and possibly a 2" meter. For the first phase of con-
struction there will be 11 toilets, 10 sinks, 2 kitchens, 2 drinking
fountains, and probably a lawn sprinkler system. The second phase
will consist of an additional 11 toilets, 9 sinks, and 1 drinking
fountain.
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3. Resolution to pay vouchers.
4. Resolution to approve revised rules, rates, and regulations.
The rules, rates, and regulations have been corrected and an opinion
obtained from Ken Baines. Except for the changes in water rates, the
revised rules and regulations are essentially the same as previously
adopted. Some minor corrections have been made in grammar, and the con-
tents updated. Upon approval, it is intended to have small, 3" x 6",
booklets prepared by the printer.
5. Resolution to purchase 2.87 acres of land at 125th and Gaarde on
a conditional basis for future terminal reservoir site.
Mr. Robert Ames has indicated that by the date of the meeting he
will have an established selling price for his father's land. This is
choice property and a high price is anticipated. -- perhaps too high for
consideration.
-1-
ADMINISTRATOR'S REPORT (CONTINUED)
7 July 1972:
A conference this date with Mr. Robert Ames and Mr Fred Anderson,
Attorney, revealed a selling price of $50,000 in accordance with the
following terms:
30% or $15,000 down
40% or $20,000 during 1973 @ 4% interest
300 or $15,000 during 1974 @ 4% interest
Of course, any transaction would be contingent upon obtaining
approval for "conditional use" by Washington County.
Another matter which was subsequently brought to my attention is
`iv the fact that the existing 125th Avenue is only 20 feet wide. According
to Mr. Rex McDaniel, Washington County Planning Department, the county
will probably require a donation of at least 25 feet for right—of—way
purposes. Therefore, if all other factors are acceptable, a request
should be made to include another 10 feet in width of the lot, making it
500' x 260' or a total of 3 acres. This will allow the required set backs
from property lines and also provide for necessary excavation space for
construction.
Perhaps an official appraisal should be made of the property, although
the district paid $20,000 for 1.1 acres for the new Hi Tor reservoir site.
Also, there are no deed restrictions on this property.
1—a
ADMINISTRATOR'S REPORT (CONTINUED)
6. Resolution to raise elevation of reservoir #3, located at 135th
and Fern Street, by 12 feet.
Reservoir #3, built in 1959 with a capacity of 500,000 gallons, was
erroneously constructed 10 feet below the hydraulic level of the other
reservoirs in the system. Because of this, the reservoir is isolated
most of the time and utilized only in the summer when the water level is
down.
By raising the elevation 12 feet, an additional 300,000 gallons can
be attained in storage capacity. A good "rule of thumb" for computing
reservoir construction costs is 100 per gallon of water storage. There-
fore, if $30,000 were appropriated for construction, it would be a good
investment. In addition to the increased storage capacity, the reservoir
would become a usable asset.
A more accurate estimated cost for construction should be available
by the meeting.
IOW
7. Resolution to authorize Metzler Water District to serve domestic
water to Oregon Toro and Hyster Companies from the 12" fire protection
main located on 72nd Avenue.
Metzger Water District has requested that these two companies be
served domestic water via the 12" fire protection main. It is rather
ridiculous that two mains be installed on the same street; one for
domestic use and one for fire protection.
It would appear that this request should be approved, but all service
terminated, domestic and fire protection, after June 30, 1973, in accord-
ance with our letter to Metzger Water District. Domestic water consumed
should be reported to us, and charged in compliance with the reciprocal
agreement between the two districts. Charges would be similar to those
customers in Metzger Water District who utilize Tigard Water District
water (north of S. W. Hampton Avenue).
-2-
ADMINISTRATOR'S REPORT (CONTINUED)
8. Resolution to credit one meter installation charge, $225, to Miss
Leah Zednick, 13995 S. W. Bull Mountain Road.
A few weeks ago Miss Leah Zednick's domestic water well went dry
causing her to request service from TWD.
Miss Zednick has written a letter (see enclosed) requesting relief
in the installation charge of a 1" meter.
On August 23, 1955 she paid for the right to 10 hookup charges on
the Bull Mountain system, totalling $4,789.54. The "hookups were never
made. She now requests that the 1" meter installation be credited to
the hookups she has coming. The normal $200 Bull Mountain hookup charge
was waived in accordance with the minutes of August 11, 1955.
9. Resolution to approve annexations.
vor
Several areas have been approved for water service which should be
annexed. These are:
a. Tigard Evangelical Church property on S. W. 121st, north of
Manzanita.
b. Property at S. W. 161st, south of Bull Mountain Road.
c. The large island on the north slope of Bull Mountain. Both
Leah Zednick and Vance Lee have requested annexation.
d. Small island south of Mr. Bill Master's property on 141st, and
east of R. A. Gray's development, where more building is planned.
e. Tualatin Development Company property on 109th and Durham Road;
and south to Tualatin River where 4 customers are being served.
f. Tigard High School and United Sewerage Agency property where a
12" main will be installed next month.
These annexations would place the district up to date, eliminate all
islands, and all customers would be within the district.
wr.
-3-
ADMINISTRATOR'S REPORT (CONTINUED)
10. Other business.
a. Progress on new Hi Tor reservoir.
Construction on the 1 million gallon reservoir at Hi Tor is now
complete, except for the landscaping. The reservoir is full of water
and in service.
b. Well water study.
Enclosed is a report prepared by Mr. R. C. Newcomb on feasible
sites for water wells in the Tigard area.
c. h school student career program.
A federally-financed pilot program to assist 25 selected Tigard
High School students in reaching a self-determination career objective
has been introduced. TWD was afforded the opportunity to participate.
I have offered to accept 2 boys and 1 girl for practical training.
d. Office - Shop Complex
Clarence Nicoli has found a potential site for a future office-
shop complex for TWD. It is located on 6.6 acres behind the post office.
Adjacent property is selling at $30,000 per acre, but TWD can purchase
this land at $11,000 per acre. Installment payments can be arranged.
The land is cheaper because it is low and next to Fanno Creek. The
district accumulates lots of excess fill dirt when installing pipe lines
and constructing reservoirs which could be used to "build-up" the area.
Fanno Creek is to be straightened by USA in the near future which would
make available more usable land.
It would appear that 6.6 acres would not be required for the district,
and after proper landscaping, portions could be sold off at the going rate
of $30,000 per acre.
e. Alternate source of water.
The following chart shows the amount of Bull Run water consumed and
cost therefor since the connection was made in July 1969.
-4-
ADMINISTRATOR'S REPORT (CONTINUED)
Cubic Feet and Dollars:
1969 1970 1971 1972
May __-_ ---- 158,900 ($604)
June ---- 256,300 ($1273) ---- 1,978,000 ($7,519)
July ---- 3,825,900 ($13,053) 1,045,000 ($3970)
August 293,200 ($968) 2,938,400 ($10,124) 3,652,500 ($13,880)
Sept 449,300 ($1483) 1,029,600 ($3,825) 946,800 ($3,598)
Oct 5,100 ($17) ---- 394,800 ($1,500)est.
Total: 747,600 ($2468) 8,050,200 ($28,275) 6,039,100 ($22,948)
— This reflects the increased consumption that we may expect during
the remainder of this summer.
During this past week with temperatures in the 90's Capitol Highway
Water District has told us to shut off the new pump on two occasions, and
curtail all Bull Run usage on one occasion. At one time Capitol Highway
was completely empty in one reservoir and down to 3 feet in another. They
simply cannot provide us with adequate water during peak demand periods.
The 12" main is of sufficient size, but the water is not there. Ray Norman,
Administrator, Capitol Highway Water District, advises that he does not
believe his district can continue supplying Tigard the huge quantities
required, and that an alternate source should be found by next year. He
has been cooperating to the fullest to provide sufficient water to us.
4000 g/m or 5mgd can be obtained via a 12" pipe if water were available.
Fortunately, the district has 7 million gallons of storage which have pre-
cluded another water crisis. The district may be lucky to survive this
summer, but the major crisis will occur prior to 1975, earlier than antici-
pated., unless corrective measures are taken.
Deep wells are great for cheap water, but the district immediate needs
are "instant" water with high flow rates. It appears now that the cheapest
and most expeditious route to take prior to the summer of 1973 would be to
install a 12" main from Bradley Corners to Tiedeman and Greenburg Road to
connect to existing 10" and 6" mains. If Portland can provide the 5 mgd
it can easily be transported via a 12" main. Further, the cost could be
reduced to a minimum by authorizing district personnel to install the main.
-5-
..r
ADMINISTRATOR'S REPORT (CONTINUED)
A meter would be installed at Bradley Corners. Estimated costs are
as follows:
5,800 feet @ $ 7/ft = $ 41,000
10" x 12" FM meter = 8,000
Bore under Beaverton-
Tigard highway 4,000
$ 53,000 *
This would be a gravity flow line with no pumping requirements.
This would provide immediate relief while the search goes on for the
permanent solution to the source problem.
In regards to the ultimate solution, the City of Portland Council
will announce this week the authorization of $125,000 to conduct a water
'ow study of the Bull Run system. According to Mr. Hyle, they are not sure
which way they are going and whether they have the so-called"unlimited
supply." Perhaps a filtering plant should be installed. Also, CH,M is
presently conducting a study to determine if Lake Oswego can provide
the required flows of water to the Tigard area.
In any event, the chances of survival this summer without a water
shortage are marginal, chpendent solely upon the capability of Capitol
Highway to provide sufficient water. Without a doubt, TWD has resolved
the problem of last year of not being able to transmit the water from the
Baylor tanks to the distribution system and #1 reservoir.
* The limiting factor in district personnel performing the work is the
capability of our equipment to lift the pipe. TWD backhoes are reaching
their limit with 12" cast iron pipe. Ductile iron pipe is lighter, but
stronger, than cast iron. It would be preferable to install a 16" ductile
iron main as the capacity can be almost doubled to 9 mgd. 12" cast iron
weighs 63.4 eft while 16" ductile iron weighs 65.8#/ft. For each 18-foot
length of pipe, an additional 43 # must be lifted.
A 16" main can carry 9 mgd which would certainly be adequate for
several years. Cost to install a 16" D.I. main is estimated at $70,000
with district personnel performing the work. In either case, estimated
costs should be doubled if private contractors are utilized.
-6-
ADMINISTRATOR'S REPORT (CONTINUED)
11. Work accomplished during June.
a. TWD installed 1610 feet of 6" C.I. plus 2 fire hydrants and
copper services on S. W. 114th Avenue, between Gaarde and Fairhaven
(Viewmount) for a development of 37 single family dwellings for Columbia
Custom Homes. (Developer's)
b. TWD completed "tie-ins" of 12" D.I. pipe crossings on Pacific
Highway at Johnson and Walnut Avenues. Loy Clark, private contractor,
bored and installed 20" 0.D. steel casings. Crossings at Park and
Watkins Avenues will not be connected until a 12" main is installed
along the east side of Pacific Highway this Fall. (Bond Construction)
c. Page Construction Company installed 1090 feet of 6" C.I. plus
3 fire hydrants along 112th Avenue, behind the Canterbury Shopping Center
where 96 apartment units are being constructed. (Developer's)
d. TWD installed 29 meters. (3636 - 3664).
12. Work to be accomplished. July
a. TWD make "tie-in" of 12" D.I. pipe crossing on Pacific Highway
at Greenburg Road. (Bond Construction)
b. TWD install 380 feet of 6" C.I. plus 3 fire hydrants along 112th
Avenue, south of Gaarde Street, for Culver Construction Company where 92
apartment units are being constructed. (Developer's)
c. TWD install 270 feet of 8" C.I. plus 1 fire hydrant on Sunrise
Lane, west of 150th Avenue, for 2 single family dwellings; Mr. Younger
and Mr. Neu. (Developer's)
d. TWD install 130 feet of 6" C.I. plus 2 fire hydrants on Karen
Street, near 127th Avenue, for Mr. Montgomery who is constructing 33 units.
(Developer's)
e. TWD clean-up and re-landscape shoulders of streets where new pipe
lines have been installed, including Omara, Edgewood, and Bull Mountain
Road.
-7-
ADMINISTRATOR'S REPORT (CONTINUED)
f. Kearney Bros Inc will install 1170 feet of 8" D.I. , 2100 feet
of 6" D.I. , and 270 feet of 4" D.I. plus 4 fire hydrants for Mr. Dale
DeHarpport's development of 33 single family dwellings on 164th and
Bull Mountain Road, west of West Colony Park. (Developer's)
August
TWD
a./ Install 3500 feet of 12" C.I. plus 6 fire hydrants along Durham
Road, between 79th and 92nd Avenues, for School District #23J. (Pipe
extension and Developer's)
September
a. TWD complete connection at Hunziker Road and Scoffins to "tie-in"
12" C.I. and 6" C.I. (Bond Construction)
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b. TWD install 600 feet of 6" C.I. to replace 2" galvanized along
Knoll Drive. (Pipe Replacement)
c. TWD install 1600 feet of 12" C.I. plus 5 fire hydrants on east
side of Pacific Highway from Watkins to Garrett Streets. (Bond Con-
struction)
-8-
/
LAW OFFIOEB OF
• WHEELOCK,RICHARD SON,NIEHAUS,BAINES & MURPHY
SD5 FRANKLIN 13UILDINO
U.E.WHEELOCK PDRTLANfl,O;--1Eoori 97204
L3LYOE R RICHARDSON
. RUSSELL R.NIEHA[79
TELEPHONE P24-59313N4,40I� KENNETH W.L2AINEE3
EnwAnn LI_MURPHY,OR_
WILLIAM E_UCJII.VY
June 27 , 1972
Mr. Robert E. Santee
Administrator
Tigard Water District
8841 S . W. Commercial
Tigard, Oregon 97223
Re: Rules , Rates , and Regulations for Water Service
July 1, 1972
Dear Bob :
I have considered the captioned document, and it appears to com-
ply with the Oregon law governing domestic water supply districts
as provided in ORS 264.
Enclosed is a copy of ORS Chapter 198 , which governs domestic
''1.1' water supply districts, as well as other special districts within
the State of Oregon. I call your particular attention to Sections
198. 510 - 198.600 which governs the adoption of ordinances and
regulations . If all of the captioned regulations , with the excep-
tion of water charges , were effective on September 9 , 1971, they
shall continue in effect until repealed or amended, and the Tigard
Water District has complied with ORS Chapter 198. However, re-
garding any amendments to regulations in existence prior to Septem-
ber 9 , 1971 , the procedure outlined in Chapter 198 will have to be
complied with.
The District complied with ORS 264. 312 regarding increasing water
rates .
Very truly yours;--
J
( ,
Kenneth W. Baines
KWB :jb
Enclosure
OFFICE
METZGER WATER DISTRICT
6501 S.W. TAYLORS FERRY ROAD
PORTLAND, OREGON 97223
June 23, 1972
Mr. Robert E. Santee, Administrator
Tigard Water District
8841 S.W. Commercial Street
Tigard, Oregon 97223
Dear Mr. Santee:
The Metzger Water District has received requests from new industries
in the S .W. 72nd Avenue - Bonita Road area for connections to the 12"
fire protection main for both fire and domestic water service.
The industries who financed the construction of the 12" fire protection
main have no objection to the water being used for both purposes. A copy
of the letter of June 9, 1972 signed by officials of Fought and Company,
Gerber Legendary Blades, and Expressway Developing Company is enclosed.
Two of the industries presently requesting service are Oregon Toro and
"o" Hyster. Domestic services would be fully metered and the fire connections
installed separately with defector checks and by-pass meters.
The Metzger Water District is planning the installation of additional
12" cast iron mains on S .W. 72nd Avenue which when completed will
permit the district to service the entire 12" main and use the Tigard
connection for emergency stand-by only.
It is requested that you discuss this proposed arrangement with your
board of commissioners to see if it meets their approval .
Very truly yours,
METZGER WATER DISTRICT
B
y
Encl .
'fir
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,
June 9, 1972
Metzner W'utet District
6'301 S. ,,,i. Taylors Ferry Road
Port lank 1, One;on 9722
C ntiem, r
Please use this letter as your authority to furnish water
to the Fought-Sivers development on W. 72nd Avenue under the
condi t ion; 01 the agreenunt made by and txt Ween Metzger Water Di st rict,
Get lrt,r IA `,Ic•tN1;tI—V 111,1'le';, t''ollght tw (' rn any anii I';n)re'.;swuy C)eV ic>t,ikq Company
Ill M vemlN,r, 1(i66.
of haue n(: object inn to this water tx•iriq used for tx)th tin.
prO, i•C't 1. t1 and (IC'r s? i<' f)1JrlosE.':;.
loworr
FOt __h)CltTPA!'TY /`--------7------- I
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BY:- - , p - - 1s
F3.1'RE.SSWAY t) :\Tr If P f X 1:0.
13995 S.W. Bull Mt. Road
Tigard, Oregon 97223
June 20, 1972
Tigard Water District
8841 S.W. Commercial Street
Tigard, Oregon 97223
Attention: Mr. Santee
Gentlemen:
I hand you herewith check in the sum of $225.00, pursuant
to your demand to cover the purchase price of a water meter which
was installed at 13995 S.W. Bull Mt. Road, Tigard, Oregon, on
Friday, June 16, 1972.
As your records will reflect, on August 23, 1955, the
undersigned, along with my sister, paid for 10 hookup charges
at a total of $4 ,7$9 . 54 . Since that time, the connection charge
has been reduced to $200.00. We feel that we should be permitted
to credit one of the connection charges against the meter charge
and you indicated an intention to bring this matter before the
Board with the hope that you would find it possible to return to
us the within payment and cancel one of the prepaid hookup charges
on your records .
Please advise me of the Board's decision.
VPry truly yours,
.K(//, L 4�
Leah Zednik
LZ/j
Enc.
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35 O. :.s , i
Auk, ;
i•ropert.y Owners,
r.•onttrct between then::l•erV ',, _r:�-;� �' the
:1'. seri i:t t:Aer System aild the 'i ,,:1 a: Dist:
. r.ir•:•s :,-spt;:m ,:r 1.955, at t.-.al; the .;:lt.;,i ;;:qtr m 1,:111_ 1=
3 jt ritedictior s; th0 ''i ,',s+i U.tto:.
1 t110 rei,u1ar ar.o2ti.n7 c.: the •,.scar,: the €o'Lat;.. sg
pasted, which will L:: of '!l} .ro,:;t to you,
" •t1.6 e:to1utioh will ans.wr several „uestiows which
r r'ro.,,
;.).Pare note thr.t the present users ha •e priority of
r•,u;• chx;is g wat.z:r connections until Ostotor hit, 1955, The
- ^,c.,l': en in its Pei:l.l-:,ws:
lesolveci that the Tigard {rioter District, and it doss limit
to total number of meter connections upon the present facilities
on the Bull Mountain System to 50i and
Reoolved that after the expiration of the Dull Mountain cony
tract thst, the charge for meter connection to said system shall_
�Q t5OO,OO, plus usual meter charge:; &nd
tesolved that present meter owners shall have a first right
to acquire connection rights, which right shall cornti.r:ue
from the period beginning the expiration of Bull 1 ouratain.
Contract and ending October 1st, 1955•, and
:'esoived that notice shall be gilren to present r.-,eter owners
informing them of the right and this term for priority,
Yours truly,
Tigard Water District
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By H. M, Propst, Clerk
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PHONE 636-4062 01631 S.W. RADCLIFFE ROAD
AREA CODE 503 PORTLAND, OREGON 97219
R. C. NEWCOMB
CONSULTING GEOLOGIST
June 29, 1972
The Chairman
Tigard water District Board
Tigard, Oregon
FEASIUT,N'. SITES FOR WATER WELLS FOR TI BARD
In accordance with conversations with lir. Hugh Brown and Mr. Robert
Santee and by authorization by the Board of the Tigard +'cater District, a study
was made of the ground water situation in the Tigard area. The objective was
to designate areas wherein sites give the best chance of success in developing
additional water wells that would augment the Tigard supply for at least several
years, until adequate additional water can be secured frcm other sources.
G RV M-AL GEOLOGIC SIni UF.TIODI
The Columbia river basalt of Miocene age, a conformably layered series
of black and dark gray lavas, forms the main near-surface unit of the bedrock.
It is 500 to 1,000 feet in total thickness; within it the individual lava flows
average about 50 feet in thickness. Tae whole unit has been folded so that a
complex north-south anticline (upwarp) forms the West Portland Hills +o the
east and broad domal anticlines toform Bull Mountain and Cooper Mountain
to the west of Tigard. Fanno Creek follows southward through Tigard above a
narrow downwarp between these tvvo anticlinal uplands.
Overlying the Columbia River Basalt is unconsolidated silt and clay,
whose eroded surface forms the plains of Tualatin Valley. Also overlying the
Columbia River Basalt and the older part of this sedimentary valley fill along
the west side of the Portland hLls is part of a younger lava series which
spread west from the Mt. Sylvania area for a mile or more, to within a mile
or so of Tigard.
Underlying the 500-to 1,000-foot thick series of the Columbia itiver
basalt are shales and sandsto.ies of Tertiary age. These older shales enter
the ground water picture only as a negative factor. They are mainly non-
water bearing but contain saline ground water where porosity does occur.
GROUND 'wATUig SITUATION
The Mt. Sylvania lavas, beneath the slopes east of Tigard, are generally
50 to 150 feet thick and carry in their lower parts, some ground water that
percolates to springs at the edges of the lava unit. The water-bearing zone
in these lavas is thin and mostly is sufficient for only individual house wells.
The sedimentary materials that underlie the valley plains are mostly
silt and clay. Though these materials are largely saturated, there are so few
sand or gravel zones within the mass that only small yields can be obtained
from wells--suitable mainly for single household supplies.
Tigard water Page 2.
The Columbia Aiver Basalt is the only unit that is capable of
supplying large amounts of water to wells. The water occurs in the rubbley
tops of some of the individual lava flows (Newcomb, 1959). The ground water
is confined, but it has a general water table level which is close to or
slightly above the level of the valley drainage system. Wells tapping a
permeable top part of a lava layer obtain various yields, usually in the
100 to 1,000 gpm(gallons per minute) range, with 300-500 gpm as an average
range. In regions where the lava layers are tilted up and eroded, water can
rain entry to the permeable layers, the ground water is recharged annually and
wells have a permanent supply. In basinal regions such as the Tualatin Valley
the basalt may not be exposed to this ground water recharge; consequently, the
wells may experience a drop in the water level as pumping is continued. Also,
in downwarped areas the escaping saline water being squeezed out of the shales
and sandstones below, may find its way into parts of the permeable layers of
the basalt. This process may take place under certain conditions that have
been describad in the Tualatin Valley (hart and Newcomb, 1965, P. 54).
CONST +AINTS
In locating wells to withdraw ground water from the Columbia river
Basalt there are certain constraints that must be considered besides the
proximity to the mains of the Tigard Water Distribution System.
Bull Mountain and the slopes to the west of Tigard are being included
by the State Lngineer in a Critical Ground dater Area because of the decline
of water level in the basalt wells there. Though the exclusion order has
not been processed, it is doubtful if the State Engineer would grant permits
*ere to drill additional wells within the proposed critical area (shown on the
accompanying map).
Along the Fanno Creek Valley, the central part of the downwarped
structure between the bull Mountain Upland and the '::est Portland Hills, co-
incides generally with the course of Fanno Creek. The axial (deepest) part
of such a downfold is generally considered to be one glace where saline water
is most likely to migrate into the basalt. L;onsecuently, the deepest part
of this bedrock trough should he avoided in locating a water well unless a
strictly wild cat exploratory type of drilling is planned. It should be noted
that the location and the causes of the incursions of saline ground water
into the basalt are not completely known, and the hazard of saline contamin-
ation must be considered in any basalt well in this p rt of the Tualatin
Valley.
The slope of the bedrock upward to the east is more gentle so that
several hundred feet of sedimentary materials overlies the basalt in the
eastern sine of Fanno Creek valley. This makes that area less desirable
for drilling sites mainly becauseofthe greater death necessary and the
lesser information now available on the quality and permanence of the ground
water supply in that section of the valley.
Tigard v iter Page 3
POSSIIHE FAVORABLE AREAS
As judged by the information we have now, the only favorable areas
available to the Tigard dater System are to the north and the east cf the
city.
A local high of the bedrock basalt occurs north of Tigard. The basalt
bedrock lies near the surface for a square mile or so centered near Progress
and >bradley Corner. The area marked "1" on the attached man is on the
southern flank of that basalt exposure and is adjacent to the 'Tigard mains
at the cross roads known as Greenburg, where S. A. North Lakota Street meets
Greenburg Road. A well in this area would penetrate about 200 feet of clay
and silt before entering the basalt bedrock and probably would need to be
600 or 700 feet deep to penetrate the basalt sufficiently to obtain 300 to
500 gem. )enth of water level from the surface would be about 50 feet in
Area 1.
Northeast of this area are other areas, outlined but not numbered on
the attached map, where a well would enter the basalt at shallower depth;
however, the areas are distant from Tigard mains and wells there might raise
protests from owners of existing basalt wells.
The areas marked "2" and "3" on the attached man are along v. b'+. 72nd
Street and would tap the basalt beneath Sylvania lavas and the clay and
silt formation. The basalt top would be reached at about 350 feet depth at
Area 2 and at about 550 feet death at Area 3; consequently, the wells there
would need to be about 800 and 1,000 feet deep respectively. Area 2 is about
vow one-fourth mile from Tigard mains and the .ma'_ns are close by in Area 3.
Depth from the surface to the water level woeld he expected to be near 100 feet
in Area 2 and Area 3.
CONSTRUCTION OF `'r:;
hells of 300 to 1,000 gpm capacity need to be drilled with a diameter
of 12 inches to a depth of about 200 feet below the water level. A 12-inch
casing should be tightly sealed with cement grout at least 30 feet into the
basalt. At a death greater than 200 feet below the water level the well can
be drilled at 10- or even 8-inch diameter. Consequently, the well would cost
about 025 to 00 per foot at the current rates.
CONCLUSION
Large quantities of ground water from wells are not easily available
to Tigard; but, if the needs for supplementary water for the interim of
the next five or so years are sufficiently serious, a conservative program
of well construction should start with a well or two at Area 1. 'rest wells
in the vicinity of Areas 2 and 3 have a good possibility of success but need
to be deeper than in Area 1.
R. C. lewcemb
'�" Consulting Geologist
•
'li,ard 'water Page b.
Hart, L. H. , and Newcomb, H. C., 1965, Geology and Ground later of
the Tualatin Valley, Oregon. U. S. Geological Survey 'water Supply
Paper 1697, 172 p., 20 illus.
Newcomb, A. C. 1959, Some Preliminary Notes On Ground rater in the
Columbia Inver Basalt: Northwest Science, v. 33, No. 1, p. 1-18.
C
Employer-Based
Northwest Career Education
Regional Pilot Program
Educational Lindsay Building • 710 S.W. Second Avenue
Laboratory Portland, Oregon 97204 • Telephone (503) 224-3650 PLANNING GROUP
-
Jim Boozer
May 17, 1972 Joyce Brock
Jack Johnson
Lloyd Knudsen
Wayne Markkanen
Newell Miles
Nory Oliver
Darrell Pennington
Fran Rogers
Ed Stanley
Mr. Robert Santee Pete Taylor
Tigard Water District Steve Telfer
8841 S. W. Commercial Andy Ward
Tigard, Oregon Orin Zimmerman
Tom Noble (Chmn.)
Dear Bob: Leo Myers (Staff)
Our community has been afforded the opportunity to participate
in a unique career education program which is an excellent
alternative to traditional secondary education. Twenty-five
Tigard High School students will be selected from approximately
100 who have already volunteered to become part of the pilot
program which will begin September, 1972.
Technical assistance and funding is being provided by the
Northwest Regional Educational Laboratory which is located in
lowPortland, Oregon. The enclosed brochure briefly describes
the concept of this program.
I am working with a small local planning group to help structure
the program, and I feel your company has the potential of being
a learning center for a student. May I have a representative
from the Laboratory explain the program to you in greater detail?
He would describe how your company might become a part of the
pilot program. I will give you a call in the next couple of days
and discuss this further with you.
Key to the success of this program will be the support of employers
like ourselves who open our doors to select high school students.
Your involvement will certainly be welcome and appreciated.
Sincerely,
om Noble
Chairman, Planning Group
eb
Enclosure
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