WMOD00075

• Contract/Permit #: #2000-2
• Applicant: Western Weather Consultants
• Project Name: San Juan
• Date: 11/1/2000
• Weather Modification - Doc Type: Application

"

Appendix to question No. 1.2

UISPOSlTLON of SILVER lODIDE U()t;L1 ^~ ^ StEl\U:G Al:l:::n.Y
II. l,clJ rcl~ct'!/' lklugl." 1\ r;UlU.:tull, Mill Ji.H'i.ild _.. Klein

ABSTRACT

Periodic 8amplinR of lurface eol1 and vegetation in
fiubalpine meadow, spruce, .nd ..pan communiti.. wa.
carried out a10ns flve tran..cea tn the carlat ar..
ln an acteNpt to determine the disposition of .llver
iodide nucleatlnR a ent u.ed tn the San JUAn anow au ~
mentation projece. ...p ea 0 Q ag., ttet, an !
8011 were taken at ..veral elevatlona along the tran-:
sects. when po.atble durtna .prlnl and tall, to allow
lnonilurlnR ot .tlver content and .1lver lDOyo..nt 1n
tht= target area, To satn additional lnfonutfon on
silver dyn..te't laboratory .cudi.. of stIver ~y.-
flu:-nt tn '011 co 1 um:n. . analy... of .Uver dUpo.ltlon
and move~ent ID the vicinit ot round-b..ed .n.ra-
tor 81tel, aad .nalrYle. 0 Ava a e ata on a v.r
in water and .now wera co.,l.t.d. Th. available data
.how no 11 lrleant Incr..... ID .tlver cootaQt war.
detected on tn. tar~ ar... an D 10.. ca... e
~h In .a. 1.. taken .t the end of the ~D1torl LI
appearad to b. fOver thAQ ta ...,1.. taken at Pi li-
Atnnin, of the pro.~~. HIly.r tenda to De r.taIn.d
.ur ac. .011 .na-Irtter. thou.h .~ ~va"nt to
.ubsurface.o v.. alil-..rvael; v.r cont.nt iil"
.tra.mflow did not IndIcate trand. In silv.r Content
-which could be attrlbutad ta tna .aadlna prolra..

INTRODUCTION

Theoretical con.id.ratIon. of tha behavior at allv.r
Jodlde Indicate a low .0lubilIty of the co.pouQd .nd
an extreme probabilIty of rapid ImmobilizatIon 10 the
80il aystem. The.e poInt to unlikely ecolo,ical ..-
pact. but It w.. conaid.rad n.c....ry to uDdartake a
.0nito~ln& p~osr.. on the ta~8.t _rea to deta~ina
uhethe~ additiona of .aedinl .aterial could b. de-
tected. and whether ..eded ..teri.l could be t.ken up
by the major plant co.munltIa. on the tars.t arca.

~~~

* 1. To meaaure the level of ailver In the terreetrl.1 I
.colly-.te... of the tar.at .r.. on . periodic ba.i.. In
o~der to det.r~lh. wh.ther incr..... of .Jiv.r-c.n b. I
detected. l
~ 2. To evaluate ailver diapo.itlon .,U"~ow,dlnl ..adin. \
gll:luH'ator lIite., to detenlino pO.llbl. DIOve.nt ot
ailYe~ t1IEouSh pby.ical and biololical pEOC........
~ 1. To IItud)' .ilver .,.."...nt thl"OUlh Moll. in iabun-
tory ayate... to bett.r underatand what influence.
aeedina asent 'ccuaul.tlon and .ave..nt.
t 4. To analy.e .r..l and taClponl trenda .In ,Uver
concentration ot _now and atreaaflow In the tarlet
ar.a fro. avaLlable Don-expert.ental data.
- .s <<.. + ,'0 nS 0...; tt-.J -
CONCLUSIONS

..

Three vl!ar'a monitorio. of .ilver concentratIOna in
Colia:.. litter, .nd .oil of ..p.n. epruca, .nd ar..a
r01'!lll111 !r.te,s in che San Juan tara.t ar.a or the IPpar
Colorlldo Rivar Pilot Protect h.. ehoVR nO a11nl Ic.at
chan e. in the.. concentration. ovar tha orlod or
sampling. An analy.i. 0 ..mpl. numbara roqu r.d to
datect annual .ddltiona or 0.002 to 0.006 ppm 4~y
"".dght. of aliver hOlD cloud ..al11na to .pruc. litter,
.lndicaee. chat detectIon of the lower annual addltJon

would r.qui~e .bout 200 ...pl.e par y..r tor S y..r.
at the: 95, porc.nt confidenc. le..l lor e.ch coalpon-
ant. [f the varIanc. of .ilv.r conceatr.tloD cao be
reduc.d fro. 0.08 to 0.02 ppa the pr,..ac ...p11a.
prolra= ahould b. adaquate to d.tact .0 .oRu.1 addi-
tion of 0.002 ppa .ftar 4 year.. At the r'IO.a
Sprin.. lan.rator .ite No. 2S .11y.r level.. ln
folia.e. litter, aoll. and ar... ta .prinl 1'73.
wera .enerally .1Ilhtly lower than in .priRI 1972,
but atill ao..what h1aher thaa before aeAdiaa e~
.anc.d in f.ll 1970. CODcantr.tione ehowed e .an.ral
daclln. from ma.i.u. l.vel. at 10-20 a. to backlround
lavel. .t .bout 200 . fro. the .tca.

He.n value. of ailver conceatr.tion. on tha t.rsat
.ra. .how that 'pruca I1te.r (O.IS p,-, ..h b.aia)
and foll..a (0.17 pp., ..h baat.) have .ilntflc.acly
hiah.r .Uver cODc.aeratlon. chaa .,ruee .0U (0.08
Ppa, aah ba.t.). On.. dry w.t.bt ".le, .ilv.r eon-
eantratlon la .oil 1. .1lalflcaoC1Y .r..ter than In
follaa_ in all thr.. ve.et.cloo CYf!!. A
....on.l trend or allyar COftceotrar:r.ine-rn
both .011 and Ye etatloa ladlcatad hi h.r cone.atra-
ton. n apr a, t aD n a t te. 0 tot
allvar la the or..t .coe at... iDd1ceta that the to
C. 0 ao COD a a C 0 a a var .. ou
o ti.aa t at n.. ._ . Cat C
pra.ant iEa t.. 0 _a... 0 r vaa ca a
al,alrlcaat .url.C. a.pOaltloa. e..ll. pilot te.Ce
ol aol1 laachins .nd plant upt.ke proc..... indicated
atrons root adaorptlon of .11var aa4 iDbibitlon of
plant uptaka.

~..:

Althou h .ilver concaatr.tioaa 1a 'DOV w.~. fouad to
be too v.r. . tD . ow .tat t . caat
ditlerenc.. b.tV..A . tl. t tara.' .r.. .
other. to the velt and ...~ O~ ~~. ~.-.a .&~v.~
cODc.ncr.cion in .now oa the taraet aT'. 1. .DOUt
twice .. hi h .a the 4owavIDd...D .Dd cbr.a tt.a.
.. hlAh .a the upw ,,&D. 0 .e D, at.a. ty
(i.... I All burned bJ .11 laDar.tora p.~ aoath)
w.. ~Ot a lood pr&diccor of .llver cODc.atr.tioD 1n
eAQW .t ~olt Cr.ek ..... Mo el~(iC'QC diff.~ene.D
in .Uvar CODcenU_U.on of eU... low could be found
batwa.n 5 .tr.... includlnl ] Oft the C'CI.t area .nd
2 to th" ueat (upWlnd)...o1: It. Man annu'l au.v.r
concentration lor tn. rlva .tr.... lucr....d tro.
CO.l t 0.3) . lO-10 . /.1 1. 1911.0 (0.6 t 1.l) .
10- 0 I /.1 in 1973. Howaver. .eaa ..tdc. cODveulon
JI.charae al.o iQcr....d froa 2.9 .]'.GC (103 cf.) In
1911 co 4,) .3/..e (160 et.) 1.1913. AlChouSh.
r~lotIon.hip obvlou.ly axl.t. b.tweeu dl.charse .nd
iilver concener.tloD In tadlvidual .cr...., DO
Rcneral predictive modal could be developed b.tw..a
th~ tuo p.r~~ter..

,. In,Hholl!Ult1.':a~ Illodal ilit th__ movm.ent of "Uver frO'Cl
~llver Iodide thrnuah .'soll coluaa va. d.velo~ed
olmi ca.ted. it 1ndic.te.~ that the .:llv.r CODeaatr.-
II tlon in the .oil aolution at aa'1 I.s.VeA 'ct.e i. be.t
\ rapre..ntad by a klnetic-typ. reaccion. coupled wlch
'an JnaJaoificant equi1tbriua-c1p. re.ctloG. A bllh
~ ad.ol:pt,lQU rau conu.nt COGuol. the iaitial
~r.aetion. but 10 to 30 p.rceat of a_puc _:llver con-
t_~.Dtratlo~ ,l. II~aly to aova thro~.h tb. pro~~~a.

1 .

!' In Steinhoff. H.
:j~all Mountains.
Collins.
~, l'r~$cnL adJre.R:

\.1. ..nd J. D. lye. (Ed".). 1916. EcoloKJcal lmVoU:lti uf MlIOl.'pilCk augll\li!.ntatlon in lh~ San
Colorado. San Junn Ecolu~y "roJ~ct. Hnal lh:pClrl. Coloradu State Unlv. Publ'1 rort

United Nations k:du..:.nIlllI..tl, S..:.h:ntJI"J.:. /lUll ~;'dl"r~1 Oq;.lId &.'u Jon. ParJs. fr""ce.

10\

A-8d-l