Mr. Jacob D. Varn -3- April 30, 1975
During this time, withdrawals should be rraintained at as consistent a rate
as is practicable, to aid in indicating relationships between cause and effect.
In effect, this initial development will serve as a large scale test and
will provide part of the information needed to estimate the effects of larger
quantities of wa-tcr that Igaht one day be taken from the well field,
If the present water nJ.ds of the developers of the Cypress Creek
Well Field requirc much more than an initial 10 mgd, an additional initial
sul y of 10 red r i-ht .e taken from the lower po1 of the well field. If
aquifer properties in the lower pool are similar to those determined to
dat in the upper pCoi, the estimated extent of primary effects and the esti-
-mated time lag would be v. ithU the ran-e estimated for the upper pool. A
sir-ih.r set of constraints should be applied to future development from the
Development of the Cypress Creek Well Fieid is underway at this
time .nd a plan for the method of development is needed now to insure that
Pasco County citizcans are provided with a. degree of protection from unde-
sirable effects due to ground-water withdrawals that may be too great or
too concentrated, iVWhile there are surely other approaches to development
of the well field, the plan suggested here for observation and staged devel-
opiment is specifically designed to meet the needs of Pasco County and
could 'c u:3sd unles s and ui.til a better alternative is forthcoming.
Very truly yours,
WILLIAM F. GUY TON & ASSOCIATES
Dr. W. L. Cuyton
Mr. Jacob D. Varn -Z- April 30, 1975
Floridan aquifer A series of Floridan aquifer observation wells
should be placed at intervals of approximately two miles along and outside
the perimeter of developed sections of the well field. Additional observa-
tion wells could be placed between the well field and water-related surface
features of particular concern, along with previously mentioned Shallow
Deep monitor wells should be placed at effective centers of pumping
within the well field to monitor the depth to highly mineralized waters.
There should be at leIot one deep monitor in the upper pool, one in the
lower pool, and one toward the center of the well field, if and when devel-
opment extends to each of these areas.
Because of the time laF between withdrawals of water from the Flo?-
id.n aquife-r and resul-nt effects upon the "-hallow aquifer and lakes, and
S'ially uon t v c of ir.ncr '.liz d ,atcr, dcveloprl.ent of the.
yield from the well field should proceed gradual l d ly, providing time for ef<-
fects to keep pace with withdrawals. The initial quantity of water taken
from the field should be small enough that the effects can be accepted by
the people of Pasco County.
Experience at other municipal well fields within Pasco and neighbor-
ing counties, and accumulated test data to date within the Cypress Creek
area itself, suer-est that a limit on the initial quantity of water developed
from the upper pool of the planned well field might be placed at 10 million
gallons per day. Prirn.ry water-table effects of a 10 mgd withdrawal,
based on methods of analysis described in our report, "Estimated Effects
of Grouind.-iator Pumping in Pasco County, Florida, January 1974, and
on analysis of test data supplied by the City of St. Petersburg for tests of
well numbers E106 and C-2 are estimated to be confined to within a dis-
tance of one-half to one mile from the center of pumping.
Based on the same methods and data, the time required for approxi-
m:itcely 50 percent of the expected long-term change in the shallow water
table to take place is crtimatjd to be from one-half to three years. To
p-1:ovidc ti to lali o it oc t :'" 2 cr ct I t.t occ..: rc.i to cv.lu.\t..
the impact of these effects, a period of at least one to two years should
elapse before additional withdrawal from the upper pool takes place.
April 30, 1973
Ir. Jacc D3. fVarn
Carlton, Fici.-, ard, Ernmanuel,
Smith & Cutler
Attorney7 at Law
Post Office Box 3239
Tar npa, Floridac 33601
Dear Mr. Varn:
As was indicated by o-ur letter of October 18, 1974, regarding the
develo-pent of a imuniii1pl vrell field in the Cypress Creek area, pro-
tectiorn of surrounding areas of Pasco County from undesirable effects
requiires that the developr-:in- t proceed in an orderly fashion with special
attention being given to:
1. Cblse.vation specific data gathered before, during, and
alter dvelupmn'n to identify effects that take place because
of -,rouil'.i- a ter v'ithldrzl -als.
2, t. DPev,-:,-.- .ent a specific plan for gradually devel-
opling the total yield of the well field, so that development
can be stopped before effects reach undesirable levels.
c c rvt ion
Observation of changes that take place in the water level of the
Shallow aquifer, e ake lcvl, the level of the potentiometric surface of
the Floridcn aquift r, a: the depth of highly rn.iacralized waters within
the Floridan aquifer, are needed by Pasco County to provide the County
\vici za L-asi. for c 'JLlih+ -,: (a) control over withdrawals and (b) evi-
dence of the intensity of effects.
Lakes and Shallow aquifer Observation points should include a
series of wells in the Shallow aquifer at appro::im;ately one-mile inter-
vals aloi5 and outLiJe- t-L. puri'imeter of developed sections of the well
field, with additional wells being placed between the field and lakes or
water-relat(ctd surface fc.'roesc of particular concern. Lakes of parti-
cular ecoi.c;?.ic or accth:ic value should be provided with a means for