Exh 9A2301 Maitland Center Parkway, Suite 300
Maitland, Florida 32751
tel: 407660-2552
' fax: 407875-1161
May 2, 2002
Ms. Donna Kaluzniak, C.E.P.
Utility Director
.City of Atlantic Beach
1200 Sandpiper Lane
Atlantic Beach, FL 32233-4318
Subject: Assessment and Maintenance of Atlantic Beach Floridan Aquifer
Production Wells, City of Atlantic Beach, Florida
Dear Ms. Kaluzniak:
AGENDA ITEM #9A
MAY 28, 2002
On December 3, 2001, January 21, and March 18, 2002, Camp Dresser and McKee Inc. (CDM)
provided resident oversight of contractors involved in removing the pumps, with associated
suction pipe and /or manifolds, from four Floridan aquifer production wells located at the Atlantic
Beach Water Treatment Plants No. l and No. 2. The pumps were inspected for buildup of
minerals (caldfication), general maintenance, repair, and evaluation Following the removal of the
pumps, with associated suction pipe and/or manifolds from the wells, the wells were logged with
video and geophysics to evaluate their condition This letter report snmmari~va the observations
and evaluations of the assessment of the Atlantic Beach Service Area production wells. In
addition, this letter report includes CDM's recommendations for present and future well use.
Background
Water Treatment Plant (WTP) No. l (46911 street) receives an average of approximately 1,650
gpm of water from production wells 1 and 2 when in use. Production well l is located at the plant,
while well 2 is located neazby at the Water Pollution Control Facility (1100 Sandpiper Lane).
Production well 1 was installed in 1953 and is a free flowing artesian well with a vertical turbine
pump. Production well 2 was installed in 1962 and is an artesian well, which free flows through a
pipe system to a storage tank klcated at WTP No. 1. Well 2 is capped and its flow to WTP No. l is
controlled with a gate valve. Production wells 3 and 4, located at WTP No. 2 (2301 Mayport Rd.),
are free flowing artesian wells. Well 3 has a Jacuzzi pump in an adjacent pump house, and well 4
has a vertical turbine pump. Production well 3 was installed in 1976, while well 4 was installed in
1998. Table 1 is a summary of the water supply production wells in the Atlantic Beach Service
Area and their assocated pumping capacities.
Since the time of their installation, the City of Atlantic Beach (COAB) has experienced significant
losses in well yields from three of the four production wells. The well assessment was needed to
consulting•engineering •constructlon •ooerat ons
AGENDA ITEM #9A
MAY 28, 2002
Ms, Donna ICaluzniak, C.E.P.
May 2, 2002
Page 2
determine the possible causes of the losses in well yield, to perform maintenance as necessazy on
the well pumps, to provide well data in support for a Consumptive Use Pemrit renewal, and to
make recommendations for improving production capadty to meet current and future potable
water demands. W. Eazl Floyd & Sons,. Inc. provided well repair services. Advance Borehole
Services performed the geophysical logging, and Deep Venture performed the video logging. A
professional geologist from CDM provided oversight during logging and repairs to wells and
helped with interpretation of the logging.. In addition, at the request of the St Johns River Water
Management District (SJRWMD) and the COAB, CDM reviewed video and geophysical logs for
wells 2 and 4 with Mr. Rick Spechler of the United States Geological Survey (USGS). Mr. Spechler
was involved in the geophysical logging of select COAB wells in the eazly 1991Ys, as part of a
regional USGS study of the Floridan aquifer.
Field Observations
In addition to the color video log, the following geophysical logs were used in the evaluation of the
wells: caliper (determines borehole size), gamma (used. for interpreting lithology), resistivity (used
primarily to identify possible salt water intrusion), specific conductance (a measurement of the
ionic content, which is an induator of salt water intrusion), temperature (helps identify water
source), and flow velodty (aids in identifying most-productive water bearing zones). Table 2
s~+**»*+~ri~eS the significant video and geophysical observations of all four wells including well
construction details.
WTP No. l
Well l
Well 1 is located in the southwestcomer of the properly at WTP No. 1. Well 1 has a 12-iruh casing
terminating in the limestone (410 ft) followed by an open borehole in the Floridan aquifer
extending down to a total depth (TD) of 1,002 feet The well is a hee flowing artesian well. It has a
vertical turbine pump with ti0 ft of suction pipe. The well is 47 yeazs old. Video logging revealed
that this well has excessive mineral (CaCOj) scaling (numerous scale protrusions off the casing -
see attached videos) throughout the casing, with the heaviest buildup scaling occurringfrom285-
410 feek
Geophysical logs of temperature and resistivity aze indicative of cooler fresh water flowing into the
well and correlates with the zones from cavities and porous limestone observed on the video and
caliper logs. Flow velodty logs show a reduced flow below 925 feet to TD. Overall, resistivity was
high and specific conductance was low throughout the open-hole section of the well indicating
fresh groundwater recharging the well
Well2
Well 2 has an 18-inch casing extending to % feet which then reduces to a 12-inch. casing extending
to 407 feet The well has an open borehole in the Floridan aquifer extending down to a TD of 1,290
AGENDA ITEM #9A
MAY 28, 2002
•~
Ms, Donna ICaluzniak, C.E.P.
May 2, 2002
Page 3
feet. The well is located at the entrance of the Water Pollution Control Fadlity and is piped to WTP
No. 1. The well is artesian and free flows to WTP 1 without the use of a pump. The well is 40 years
old. Video logging revealed that this well has even more mineral (CaC03) scaling and pitting
throughout the casing than welll.
Geophysical logs of resistivity and specific conductance indicate that the well has signs of saltwater
intnuion The water quality is twice as conductive as well 1. There is a zone from 1,168-1,180 feet
with a high flow velocity and poorer quality wafter. Limited water quality sampling of the well in
2001 by the Gty further substantiates evidence of saltwater intrusion The SJRWMD considers
fresh groundwater in northeast Florida, unaffected by saltwater intrusion, bo have diloride
concentrations in the range of 20 to 30 mg/1. Well 2 was sampled twice in 2001 and had reported
concentrations of 98 mg/1 Quly 25~) and 113 mg/1 (November 5~).
WTP No. 2
We113
Well 3 is located on the southeasYcomer of WTP No. 2. This well is a free flowing artesian well
with a centrifugal Jacuzzi pump in an adjacent pump house. The well has a 16-inch surface casing
(110 ft) that reduces to 12-inches terminating in the top of the limestone (394 ft) and is followed by
an open borehole in the Floridan aquifer extending to 1,014 feet. Well 3 was installed in 1976 and is
25 yeazs old Video logging revealed that this well is in fair condition There is moderate build up
of scaling.
Groundwater clarity was exceptional with little suspended particles flowing through the well.
Numerous cavities and fractures were observed to have significant flow velocities, decreases in
temperature, and anomalous resistivity highs. This data is indicative of fresh water flowing into
the well at these areas in the limestone. Most of the flow appears to be coming from above 900 feet.
There is a zone with vertical fractures and voids, which is apparently a contact between different
lithology and formations. This fracture zone can be seen in all 4 production wells. The zone can be
seen at slightly deeper depths in wells 1(671-674 ft), 2 (678~i79 ft) and 4 (663-667 ft). This zone
appears to be a prolific water-bearing zone in each of the wells.
We114
Well 4 is located on the west side of WTP No. 2 The well was installed in 1998. It has a vertical
turbine pump with 65 feet of suction pipe. The well has a 16-iruh surface casing (100 ft), redudng
to 12-inches terminating in the bop of the limestone (422 ft), with an open borehole in the Floridan
aquifer extending to 684 feet. The well was observed to be in good condition (no scale protrusions
off the casing -see attached video). There was very little build-up of scaling inside the casings. An
offset of approximately 4 inches was observed in the open borehole beginning at 493 feet,
indicating that the well is not completely plumb.
AGENDA ITEM #9A
MAY 28, 2002
Ms, Donna ICaluzniak, C.E.P.
May 2, 2002
Page 4
The gamma and resistivity logs showed a similar profile to well 3. -The flow velocity log was
relatively consistent with a slight inaease at approximately 455 feet There were almost no gamma
counts recorded from 426570 feet indicating an exceptionally clean and pure limestone void of
clay, organics, or phosphate.
Assessment of Reduced Production
Based on the video and geophysical logging and field observations performed for this project,
there are several maintenance activities and improvements that need to be made to increase the
reliability of meeting current and future water demands. The age of wells 1, 2, and 3, combined
with regional drawdown in the potentiometric surface elevation of the Floridan aquifer, have
resulted in reduced yield from the Atlantic Beach Service Area water supply wells.
Data from a USGS monitoring well installed neaz Mayport indicates a reduction in potentiometric
surface elevations in the area over the last 5 years. This is substantiated by groundwater modeling
performed by the SJRWMD (Durden,1997 and 2000) showing that pumping from other legal users
of water QEA, the NAS, and Jacksonville Beach) has caused a reduction in the potantiometric
surface of the aquifer.. Additionally, well losses due to calcification of the well have further
decreased the specific capacity (discharge per unit foot of drawdown) of the three older wells.
Well Repair
CDM subcontracted W. Eazl Floyd & Sons, Inc. to remove manifolds, pumps, and assodated
suction pipe. During the removal of $re pump and suction pipe for well 4 at WTP No. 2, it was
observed that the drive shaft was made of carbon steel with a small section of stainless steel. The
sections of thecarbon-based drive shafts were damaged. These were replaced with 65 feet of new
stainless steel shafts. Tn addition, Fioyd & Sons replaced adamaged 5-foot section of suction pipe.
Table 3 is a summary of the well repairs.
Recommendations
A summary of existing water supply well conditions and recommendations for future water
supply are presented in Table 4. This assessment was conducted to refine the recommendations in
the Water Master Plan for water supply well rehabilitation replacement
As indicated in the table, CDM recommends that the COAB abandon well 2 at the WTP No.1.
This well cannot be rehabilitated, due to excessive corrosion of the well casings and the age of the
well. In addition, there is evidence of saltwater intrusion occurring at greater depth (lower
Floridan aquifer) in this well. Therefore, as required by the SJRWMD (Chapter 40C~, FAC -Water
Wells), the well should be abandoned due to potential cross contamination of aquifers. The COAB
can take advantage of the St Johns River Water Management District ccet sharing well
abandonment program which will pay for up to 25 percent of the cost of well abandonment Well
AGENDA ITEM #9A
MAY 28, 2002
Ms, Donna Kaluzniak, C.E.P.
May 2, 2002
Page 5
2 should be replaced with a new shallower well (700 to 800 feet bls) capable of providing a similar
yield to the existing well. Abandonment and replacement of this well is consistent with
recommandations in the Water Master Plan
Well 1, located at WTP No.1, should be decommissioned and replaced within 5-7 years due to
caldflcation and corrosion of the well casing. Well 3, at WTP No. 2, should also be
decommissioned and replaced within 7-10 years due to calcification and mnosion of the well
casing. Abandonment and replacement of these wells is consistent with recommendations in the
Water Master Plan
Based on the condition assessment of the Atlantic Beach water supply wells, CDM suggests that
the Water Master Plan's recommendation to interconnect the Atlantic Beach and Buccaneer water
systems be completed as soon as possible. The interconnection provides the city with an
appropriate level of supply redundancy and flexibility. CDM recommends the replacement of
well 2 be added to the cit}/s capital improvement program as a project requiring immediate
funding. All new wells should be logged every 10 yeazs to observe the integrity of the well casings
and pumping capacity.
If you or your staff have any questions concerning the contents of this letter report, please call
me at (407) 660-2552.
Very truly yours,
~N - V V v/~^^-'~
lpe P. Wiseman, P.E.
Principal Engineer
Camp Dresser & McKee Ina
LPW/sb
FILE: 20376-34518/ E-110 w/o attachments, E-600 w/attachments
N:\20676\34518\AB_Welt_Letter.doc
c: Jim Hanson -City of Atlantic Beach (w/o videos)
Donald Maurer, P.E. - CDMjJacksonville (w/o videos)
Jason M. Mills, P.G. - CDM/Orlando (w/o videos)
Tahle 7
Inventory of Existing Water Supply Wells and Pumping Capacity Data
for the Atlantic Beach Watsr System
Weil or Welifield Casing Casing Total Well veld Actual Existng or
Pum
p or Faali
ry Dia. D th
~ pa yt
p at Time of Pump Date Pum
Ped or Flowing
proposed In Use? Source
Type
Number Name M) (ft) (fr) Installation Ca act
o b Drilled (date) (Y or N) Aquifer
in m i
1 AB WTPt 12 470 1,002 2,000 950 1953 Vertical lurbine 75 h Existing Y Foridan Hous
2 AB WTPt 18 x 12 18' - 96
tr-ao7 1,290 •3000 •700. 1982 Free Fbwing ExisBrg Y Floridan Hous
3 AB W1P2 18 x 12 15' - t 10
1r - 394 1,014 2,500 1,650 1978 JagrIIi 30 hp Existlrg Y Foridan Hous
4 AB WIP2 16 x 12 18• - 100
tr-4zz 884 .1,850 1,750 1998 .Vertical turbine 30 hp Existing Y Foridan Household use
• Artesian well free flowing wHlwtd a pump on it.
AB =Atlantic Beach
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