Title: Letter to law firm
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00051247/00001
 Material Information
Title: Letter to law firm
Alternate Title: Letter to law firm reviewing summarizing the review of the well field development planned for Cypress Creek and with recommendations for changes and additions.
Physical Description: 7p.
Language: English
Publication Date: Oct. 18, 1974.
Spatial Coverage: North America -- United States of America -- Florida
General Note: Box 2, Folder 5C ( COSME-ODESSA SFWMD - SWFWMD ), Item 88
Funding: Digitized by the Legal Technology Institute in the Levin College of Law at the University of Florida.
 Record Information
Bibliographic ID: UF00051247
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: Levin College of Law, University of Florida
Rights Management: All rights reserved by the source institution and holding location.

Full Text

Mr. J. D. Varn -7- October 18, 1974

4. The ultirnate production capaMlity of the well field would be
estimated on the basis of these tests, both individually, and
collectively. If necessary, the pumping might be limited to
smaller arrounts, or it might be spread away from the clus-
ters, by drilling new wells and ceasing to operate others
within the clusters. If the well field could support more
withdcrawals, the added production could be spread over the
general area between the clusters.

Monitor inr

We have often made a special point of the importance of monitoring
effects of pumping as part of any major well field development. The observa-
tion proparn that is now being carried out by the USGS should be reviewed
and, if !ncoc.t2ry, e.paded to provide a continuing picture of water levels,
streantrllow, and precipitation in the area as effects of pumping take place.
M'onit: ells sh-.aud be c:.nstructed to de:tct any major rnovement of highly
mn.ine.rZeed water that might take place as the result of changes in the potentio-
i!tric surfacc.

Data tBase and Review

Now seems to be an appropriate time for a general review of the back-
ground da.a that will be necessary for Cypress Creek as the well field is
developed. The responsibility for accumulating the data, distributing it to
the intei "c;ted parties,, and organizing and maintaining a "data base" should
be clc rl y nsined so -. at needed information is not overlooked and all infor-
nation :s readily avail'abe. An initial stop in compiling this data base is a
field inventory of all wells *in and near the proposed well field, .with well loca-
tions ard all other pertirent measuring points located on a base map for
general use.

The meeting held on September 20 between technical representatives
of the four parties to the Agreement seemed to be valuable to all concerned.
If the parties are inter.alced in maintaining their technical interests through
these representatives, it might be of value to establish some clear under-
stan.dings regarding joint planning and data review as development of the well
field progresses.
Very truly yours,

W. L. Guyton

Mr. J. D. Varn -- August 18, 1974

5. Increasing the production, again by the lowest practicable
increment, spreading the panmping, and repeating the observa-

6. Limiting production when the limit of acceptable effects has
been reached.

To use I. -:-ults of large pumping tests to nrrake preliminary esti-
r.atc oc the rpr::ir~um productivity of the well field on the basis of a spe-
cified level of effects, the pumping tests should cover the proposed area
of c -,Ipmcnt. If this approach were carried out as part of the develop-
moent of the well field, clusters of wells would be located so that the effects
of each .oTh. be relatively s p ar:te, th. ;rocct!on frrom cach would be
4.a i.h t .,.?. ff!cts il"e ,",ithin a liV itnd area,
;vJd the effect' of .r ;r: in from- each cluster would be allowed to reach
rec tc::ilo ;tca.y- tt:t c r-' ti-ions before efrth er development was planned.
This procedure v'oiild ',rhas give better advance knowledge of the ultimate
aour of punC- in, t,.. colid bic ,ustainc:l than if the wells were spread
unlfi'ly over Xth : r ara to s.. ~.1ith, but it also could conceivably
-% tT._ so% P..
result V6 #.ome well being too closely spacFd. Under the present cundi<
tion, cicnsidering th e develop rent now under way, development by this
procedure right proceed as follows:

1. The first three production wells at the northern end of the
pipeline would constitute the first "cluster, which would
producc approximately 9 -ngd. Effects of this first produc-
tion step would l:.Z allowed to progress well toward equilibri-
um before further production would take place.

2. Assuming the results of the first cluster did not dictate other-
wise, a second cluster, toward the center of the well field,
would also be established to produce approximately 9 rngd.
The effects of the second cluster would be allowed to develop
before .further production takes place.

3. Depending on satisfactory indications froim the first two
clusters, a third cluster, located well toward the southern
end of lhe "o.Cwer pool," would be constructed to produce
ap:. .-. :i "; .;ly 9 ,a:yd. If-aLc. of the third cluster would be
allowed to approach steady state before further production
takes place.

IMTr. J. D. V'rn -5- October 18, 1974

has yet been obtained that in our opinion will support predictions of long-
term or steady-state conditions, other than the general order of magnitude
of the decline of the rotentiorJetric surface at the pumping wells, that might
exist due to ground-v.watr withdrawals in Cypress Creek. Consequently,
the 30 r:d tim:at. does not appear at this time to be satisfactorily tied
to effects thvt puvrping rnmiht produce.

A pumping test is scheduled by L, E & G in the relatively near future
that will withdraw several mgd for several weeks. Further, as part of the
well field development, L, B & G have indicated plans to carry out a pump-
ing test using the fir hr,"e proOuction wells at the northern end of the pipe-
line, onrce thCse v'ells can be produced into the pipeline. Thig test could
have a pr-nmping rate approaching 9 to 10 mgd, and could last'for a period of
r .nct :. Th.e- te-fs afre e:tp ctd.. to produce the type of information neces-
eary to b-egin to estimate ultimate well-field production.

Ac. 'r.s lee:i nurc'vlously diCcceacd, ard as is indicated by the plans of
LT B &.r G for production testing, the large flow rate, long-time testing re-
quired ip probably riost practicably carried out as part of the well field
develop nent, From the viewpoint of Pasco County, therefore, we believe
that the well field development should be planned in stages in such a way
that the necessary information will be obtained before the development pro-
ceeds to the extent that its delayed effects will be beyond acceptable limits.

The most conservative method for developing the maximum producti-
vity of the well field within the limits of acccpt.ale effects is to spread the
withet i vwals over a vricde area, stage the development in small steps, and
wait for the effects of pumping to become established before adding the next
astep. Under the prcs e.it conditions, this 0wo;uld involve:

1. Setting an initial well field production rate at the lowest
practicable level.

Z, Spreading the pumping over the entire well-field area.

3. Establishing a full complement of observation points for
rpcnitorinT effects.

4, Holding the production rate relatively constant until changes
in the water table, in the potentiometric surface, and in the
positions of mincralizcd water have stopped taking place.

M 3r. J. D. Yarn -4 October 18, 1974

or lower than that encountered at the other major well fields. In the north-
west corner of the Cypress Creek area, leakance is probably somewhat
i.'gher, although the B, C & E test result that this estimate is based upon
was affected by flaws in the test well construction Records obtained by
L, 3B :G of bck'r-round water levels in shallow and deep wells at their
te~t site1 generally seem to indicate much closer coupling between the
shallow and Floridan zqufCrs than can be iterpretod from the growth of
a cone of denresoion in te potenriomerric auracz during a pumping test.
The shape of the "pot:nt',n.etric surface of the Floridan aquifer also appears
to idica.e lettr hy 2..ic co li. in th Cynrnss Creek area than in near-
.by aa. The de rce. to which this coupling might take place close to the
rtreamn bed, as opposed to over a larger area, cannot be determined from
any tcttc to date. In fact, it ap:car' urlikcly that any projection of steady-
..-... cc: puntmrin. tests where ,inrping rates are on the order of 1, 000 gprn and
which last for period %. of timer.. on tho order, of several days.

Conseq.-Jcntly,n umning tcsts to be r.Ged to obtain design data for the
proposed Cypress Crecr- WVell Field should stores. thu aquifer system with
high purmping rate and long pumping times. On the basis of the testing to
date, it appears that for a single well, a pumping test conducted at a with-
drawal rate of 2 to 3 rm-d, carried out for a period of weeks, would be ex-
rected to produce a cone of depression that was at least beginning to come
into balance with its recharge and would produce drawdowns in observation
wells of sufficient magnitude to allow acceotalle quantitative interpretation.
Tokss of this rna-..i tiae are presenlay planned by L, B & G for several of
the p production wcllse no-.- under construction. Even a test of this size, how-
ever, would not be expected to produce changes in the shallow aquifer which
clc rly indicate the rtaedy-ctate effects that may take place. It appears
that the best and most practicable nmtchod for YTeasuring these potential
effects will be through careful monitoring during actual production of the
well field.

Develo fmcrnt

Accordin;- to plans prepared for the City of St. Petersburg, it is
c!.f-:d thlt the first ph..e of the development of the Cypress Creek Well
Ficld provide a prom iL:vc c..;~ ity of 30 r.:d. At the present time, this
production is sciticuied to comr-e fro; n ten wells located along the eastern
edge of the "upper pool. Eased on test results to date, no information


Mr. J. D. Varn -3- October 18, 1974

should be carried out to estimate hydrologic properties. In general, the
artenian Fl.ori~an eystem comes into equ.l.ibriumn relatively quickly with its
recharge. The sources of recharge such as the evapotranspiration, how-
ever, may take a significant time to reflect changes that take place as
water Is taken into the artesian system. For example, a cone of depres-
sion in the potentiometric surface may reach near steady-state conditions
in a few weeks, while depressions in the water table, or lowered lake
levels, or dcwatered surface lands, or movement of mineralized water,
may take years to become clearly established. This time lag presents a
severe obstacle to fast and maximum development of ground water in this
area, because prediction techniques for effects of pumping are relatively
limited and co sequently these e'octs rust to a large extent actually be
seen to know when to restrict withdrawals. .

In addition to the time required to establish steady-state conditions,
substantial quantities of water must ordinarily be pumped in any given
pumping test to create drawdowns from which reliable test data can be
obtained.. This is the rocult of the fact that the Floridan aquifer is sach
a good conductor of water, or is highly transmissive.

Black, Crow & Eidsness, Inc., acting on behalf of Pinellas County,
has carried out pumping tests of several privately owned wells in the
Cypress Creek area, and has conducted tests in conjunction with test
drilling in locations within Section 33 and Section 20 of T 25 S, R 19 E.
In the same township, the firm of Leggette, Brashears & Graham, actlag
on behalf of the City of St. Petersburg and the four-party agreement, has
carried out tests in conjunction with test drilling generally north and L.outh
of the southern boundary of Section 14.

Based on the pumping tests conducted to date in the Cypress Creek
arec., by 3, C & E and L, 13 & G, t'-e trancmisoivity of the Floridan z.Iifer
appears to be itt:hin the general range oftrancmissivities encountered at
nearby major well field, including the South Pasco, Lutz, and Eldridge
Wilde Well Fields. Aquifer storage coefficients determined from the
testing appear to be generally nearer the higher end of values encountered
at the other major well fields.

None of the tests to date has provided results from which effective
leakance can be satisfactorily determined. On the basis of a test by
B, C LC E in Section 33, and a tcot by L, B t G in Section 14, the ef.cc-
tive leakance in these areas could be considered to be nearly as low as

Mr. J. D. Varn -2- October 18, 1974

To provide a basis for determining effects of pumping, a background
of hydrological conditions should be compiled before major development of
the ground-water supply takes place. The United States Geological Survey,
in cooperation with other government agencies, has already established
data-?ratherin. points to define the potentiometric surface and the water
table over much of the area in and around Cypress Creek. Eased on the
data pubichlcd qr::'rtery by the U"SS, measurements in Cypress Creek are
ritri.urily concc-r.tat-,,!_ in the northern half, or "upper pool" of the planned
well field devecloprc:nt. Observation points in the "lower pool", or south-
ern .ccf of .the dc.velop.t, shold alao be erabhlished as part of the gen-
eral development of the field, and this would best be done well before major
withdrawals take place in the area. In addition fo water-level measurements,
the U'GS now has strLarffoer nreasur'nug po-i:-.s on Cypress Creel: nfear
Dr rhy, n AntP.rto (SR 54), Vort h rton Cardens (SR 52), arnd Sulphur
rSprins. Also, at least one mrea during station for precipitation is operated
by tihe -U.C, in Cyprccs Creek. I

Evanot',anpit.--on in -th'i .rcnral iOcle Gulf Area has been deter-
rnninc. by the US;GS (Middle GCuf Study) to be on the order of 35 to 40 inches
per year. The Cypres;3 Creek area, which appears to be an area of natural
discharge from the Floridan aquifer, could conceivably have evapotranspira-
tion rates that are even higher, and a reversal of natural leakage caused by
pumping could cause significant changes in the amount of water discharged
to the atmosphere. As a part of understanding the hydrology of the Cypress
Creek area, it will be desirable to know as much as practicable about
c-vao-rarpratio rates before and after pumping, and studies toward that
enic' shouldd be considered.

The actual depth or location of mineralized water in the Floridan
aquifer beneath Cypress Creek is not yet known. Plans have apparently
bejen r.-;.de by the City of St. Petersburg to deepen their exploratory well,
E 106, to locate the mineralized water. This well is adjacent to the first
three production wells being drilled in the northern half of the well field,
PL.,n for probl:lj te mine iL.ibed wv.atcrs in other areas of the well field
are apparently not yet firm. However, we believe that at least one or two
other such deep holes should be drilled as part of the well-field testing
prior to extensive development.

Vell ri,-!d D,,' n D.ta

Te natural response of the generalized leaky aquifer system (shallow
aquifer confining bed Floridan aquifer) governs the type of testing that

'c . '...- 1V8 197'4

Mr. J. D. Varn
Carlton, Fields, WVard, Emmanuel, Smith & Cutler
Attorneys at Law
Pcst CUfic rox 3-239
Tan-pa, Florid: 33601

Dear M.r. Va nr:

This letter summarizes our review to date of the well field devel-
opn:act plG.nr~e for Cyprees CroCk, and p'resento recommnenrdations that
wv 1 avZ at t tC':. The tc-t res Elts c.r-i data reviewed w6re supplied
by JL, 'gtte, Bashars, & Graham; Black, Crow & Eidsness, Inc.; and
thLe CoiaL-.w:,t L 1id;% Water a" agenL:t Diclt:ict. In addition to our
review of wri'tct,:- niaterial, I met with technical representativ:. of the
a!l.ove rnenn:'):.x-, orznn:zationn on Scptcrber 20, 1974, to discuss the
y t ., .9 k- L .- I"% rJ V,< .. "" fo r ir
dat .: ".. as f ,or :' ard develo Ament in the

Eased on discussions in this meeting, our interpretation of the
material supplied to us, and our previous work for Pasco County, the
following par:" ..aphs are dccigned to provide:

a. A. b:ief summary of aquifer systemrr response and general
data r needs,

b. The present availability of background and test data,

c. A. approach to well field devclop-ment that would be ex-
pectcd to provide a degree of control over effects due to
pulp i Lag.

F.ach -round Dr. r

The cffccs of grouind-':-ator withdrawals in the area are expected
to be prin:arliy dependent upon changes that take place in the water table
.,, I. .. .. .J ,
of tl.,' :. :...:'., ^ ..i:. **: a 1:-.- t,.a \ : .,-tric c rr.a co of the 2 lorld, n
aquifer. These ,ffects could include, among other things: lowered wa!er
levels in shallow and deep wells, lowered lake levels, decreased alream-
flow, cha-:ctl in vect.tiion, sinkholes, and movement of mineralized

University of Florida Home Page
© 2004 - 2010 University of Florida George A. Smathers Libraries.
All rights reserved.

Acceptable Use, Copyright, and Disclaimer Statement
Last updated October 10, 2010 - - mvs