The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1894-09-23


At its mouth on the seashore In a confused
masa Thus no map could tell when he
hegan TO burrow through this mass of
earth what its character might prove to be.
for what he found at one point Was no
index to what lac might find few feet fur
Their along. Test holes were put Gown to
soIve this question. but they had the effect
81 rather misleading the engineers, for
they happened 10 strike the best kinds Of
material to be encountered in the work
Of excavation. Thus they anticipated
no extraordinary trouble and located the
line of the tunnel from an open cut under
the intersection Of Roliin and Republican
streets west under the center line of Re-
publican street 60 point about forty feet
vest OF the west line of Lombard street,
where IL defieets TO the southwest and
runs diagonaliy under lots aud blocks TO
ihs foot OF Depot street, where 10 opens
on tide water its total length being 500
feet. II was decided TO make IL q perfect
circle OF six feet inside diameter, with
fail Of one inch in leo feet. lined with
brick, and with barrel stave outfall
pipe thirty inches In diameter extending
BN feet out into the Sound to a point
about three feet below the surface a. low
water. A castiron receiving basin 3axS6
Inches forms the connection between tun-
mel and ouIfall pipe. The ares IL will drain
shown by the accompanying map.
The work OF actual excavation was
begun az the foot OF Depo; street on March
u isai, aud carried on continuously until
March l. lS92, up to which time l. 400 feet
bad been driven. Aboe; the same date
york vas begun on the sinking of a shaft
q feet deep At the intersection of Lom-
bard and Republican streets. aud was
completed on August 10. 1891. Excava-
Ten vas then begun from the bottom of
tAis shait both east and west, and was
completed 90 Roli.n street.. l.oSi feet. on
May z iS92 From the SHAFT westward
excavation began on September l. 1891.
and sss continued without interruption
uaill January -, 1892 when .oSS feet had
teen driven in this direction. IL was ia
the 1870 feet remaining that the grsss
dinieulsies were encountered. the most
serious delays occurred and the only loss
o. Lie 10 10 laid To the account Of the
work.
ruRouaH GLACIAL pErosfr.
II was ia the eaarse Of this excavation
that true idea vas formed Of the tresch-
ssoas ana caSagsable character Of the
ktoand 90 be trsvsrssa. Beginning at the
Depot street end IL runs through avery
sespact hsEdpan. which needed very la
ie nmbeFlng. Fer she next 10 feet IL
GUS fairly compact blue clay. with
s'seaks OF iajabe clay running through IL,
and eross-cgs eth ulany small seams II
sAnd carrying water. Dor the next 80
stss The nAtesia. Is very nraa and rather
aff blue clay. Theu at a point |, AZ feet
east oi the portal the tunnes runs into
aiiny. ssetal dritt. which continues for
-" iees the excavation through whieA
eat as muca as al the rest Of that
paft OF tie q ora. It IS saseharged with VA
W. ana as the tg8nsl Was drgyea through
nsag.y a. the Nesss IA that para Of the
sa1assy became dry. and have ever stnee
NnsAlned go. although the tunnel isssif IS
AZ ieSt eeioS the snFface IL - estimated
taAs at en~-s.stlesA a. mach SsssF Is new
asAsnE into she tunnel where IL pierces
sais material ~ when the s8anei VAS first
aFisen. fast wAieA proves taas > sasssr-
s@arsa reservoir sas drained. Ihe
eassg woul1 aitsa burst "a from the sides
~ streams a. tA3ek as . mans leg,
carrying VITA Il great quantities
9aAcksaad. an often eeadsEs
larEe "a mans Ast.
e1s u ~AlcA a. h2F.sa wllA saea foEss