Tony,
Do you guys feed Seaquest? One of our clients was thinking about switching to that chemical for corrosion control. The sales rep.
piakes ‘ lot of claims about how well it works, but we wanted to check with some operators that have actually been working with it
ra while.
if you are using Seaquest, are you happy with it? Have you observed any major advantages or disadvantages? Has it affected
your chlorine residuals or any other water quality data (changes that can be directly attributed to the chemical)?
If you don’t use this product, then please disregard this email.
Thanks, Greg
Greg B. MeGlohorn, P.E.
Project Engineer
8.P. Barber & Associates, Inc.
Printed for Michael <
[email protected]> 5/4/2006
xxxEND_PAGE:deq02_b216_2370_2887_183
Corrosion Control Project
INTRODUCTION
In an effort to limit the lead and copper contaminants found in the distributed
water supply hee Water and Power Authority undertook the Corrosion
Control Project, Assigned initially to the Environmental Affairs department this |
endeavor grew to encompass personnel from the Maintenance, Water Distribution and
Engineering departments in both districts united in a joint effort to bring four automated
chemical injection systems on-line.
The chemical in question is an orthophosphate based solution Seaquest which has
been certified by the National Sanitation Foundation and approved by the Department of
Planning and Natural Resources as a corrosion treatment. “Seaquest produces a mono
molecular coating on the interior of piping in order to diminish pitting and reduce bio-
film formations while sequestering lead and copper contaminants for later flushing.
Manufactured and distributed by Aqua Smart, Inc. of Atlanta Georgia the Seaquest
injection process has proven successful at several distribution systems throughout the
world. England, Brazil, South Africa and New Mexico are all reported to have Seaquest
treatments in operation within their boundaries.
Design Methodology
The chemical injection system design was formulated solely by the Engineering
and Environmental Affair departments. Two systems were specified for ay
distribution system to meet the need of the two separate 16” and 24” systems (an
upcoming project). Likewise two systems one treated the desalinated and well
water systems,
xxxEND_PAGE:deq02_b216_2370_2887_184
83-21-99
Pe ey se]
Project Schedule
The Authority ‘was mandated by the Department of Planning and Natural
Resources to complete installation and begin application of the corrosion control
treatment within ninety (90) working days following the receipt of written approval. This
approval was received by the Executive Director's office on January 24, 1998
determining a start up date of no later than June 8, 1998. Despite several construction
delays the first system was energized and treatment initiated on May 4, 1998 |
Pump Station orf aaa. The second system on (gaat was installed and placed
in a stand by status, while bothggemesystems have been brought online. Refer to
Figure 1,1 the ‘As Built’ schedule for further detail,
Operations
Ideally, it is intended that the corrosion control system operates with a minimum
of manual support, In fact, once the chemical in its powder form, is mixed and
transferred to the injection tank it is expected that the system will operate in automatic for
approximately 2 - 3 days at a time, even to the point of notifying the operator when a new
mixture is necessary, Several alarms and fail-safes and have been configured into the
system to avoid equipment damage or operator injury. Additionally, all operators of both
Water Distribution departments partook in a two and a half-day training seminar held by
the system’s designers, During these sessions a review was made of the Material and
Safety Data Sheets of all pertinent chemicals and the proper safety procedures were
demonstrated for all required services of the operator(s),
xxxEND_PAGE:deq02_b216_2370_2887_185
Once chemical mixture is accomplished the injection pumps electronically
controlled by the procéss ene station increases or decrease the injection stroke
percentage to supply 0.5 ppm of phosphate in the system. The phosphate analyzer
monitors a sample taken from the distributed water, and supplies a signal to the process
control station. Simultaneously, the water flowmeter provides a like function for the
water flow parameters of the system. Auxiliary transmission furnishes output readings a
system recorder and alarm announcer.
Treatment
Through the operational procedure described Seaquest treatment has been in
progress in ees for nine nionths. The manufacturer has recommended that
systematic flushing procedures be implemented after approximately six to twelve months
of treatment at the present rate of injection. Additionally, system monitors were installed
to detect concentrations at remote locations. This was to verify treatment throughout the
systems entirety. Chart 1.3 below displays the residual phosphate concentration at
remote (sample points farthest from injection) locations.
Chart 4.3 Remote location phosphate residuals
>
OS we oe Chtaee ee Fe
aw
xxxEND_PAGE:deq02_b216_2370_2887_186
Though the majority of these concentrations varied from 0.2 to 1.6 mg/l.
Readings clearly indicate that the treatment is reaching the furthest points in the system at
the recommended désages.
Conclusions
After successful implementation, thames W ater end Power Authority is
now in compliance with the Environmental Protection Agency and the Department of
Planning and Natural Resources consent decree. With al] departments working
collectively the project wes completed within the allotted time. The Authority
subsequently realized tremendous savings between the estimated cost and the actual cost.
The final evajuation however relies on the results of the corrosive, lead and copper
contaminant testing to be performed March 1999.
xxxEND_PAGE:deq02_b216_2370_2887_187
SSE eS SS a SD oe ne rosin adietiae tt UY AVENE NS Et
VIRGIN ISLANDS on
ann POWER
AUTHORITY /y
eg }OX 1450. ST. THOMAS
US. WGIN ISLANDS d0804. 1450
. TELEPHONE: (3411) 774.3552
FAX. (94) 776 2723
July 12th. 1999
Christine Lottes, PWWS
Department of Planning and Natural Resources
Division of Environmental. Protection
Government of the Virgin Islands
1118 Watergut Homes
Christiansted
St, Croix, V.I. 00820
Dear Ms, Lottes,
Enclosed please find the calculated 90th percentile values
of Lead and Copper content in distributed water from. the
St. Thomas system, located in the category Tier 3.
Of the 60 sample sites only 13.3% were collected from the
same location as the initial survey in 1993.
Statistical account for the 60 sample sites are as follows:
26 (43.3%) Single Family Resident (SFR) before 1983
14 with cisterns attached.
5 ( 8.3%) Single Family resident (SFR) after 1982
1 with cistern attached.
29 (48.3%) Multi Family Bldg.
27 with cisterns attached.
A total of 70% of the 60 sample sites were connected to
a cistern, : a
xxxEND_PAGE:deq02_b216_2370_2887_188
Cc. Lottes, PWWS page 2
July 12th 1999
Also attached is a map of the St. Thomas distribution
system with sample site locations.
Please call me if you have any questions at 774-3552
ext, 2313,
sincerely
/f a aclu
@lise Knudsen
Laboratory Supervisor
cc: Martin Ramirez, Superintendent of Water Distribution
Greg Rhymer, Manager Environmental Department
Carol Aubin, DPNR/DEP. St. Thomas
xxxEND_PAGE:deq02_b216_2370_2887_189
Trt ans St aS stab ee cea CSN ARS AEE AN LID OTE OL SOTN SETS RES SSE Ot ents eno:
Lead and Copper Monitoring Test Results (*)
Collected between March 22nd and April 6th. 1999
Lead values (**): Copper values (**):
Sample ID Lead (ppb) Sample ID Copper (ppb)
816 QT wi. 825 293.2
813 26.3 812 166.5
835 23.43 809 149.6
106 47.0 601 134.3
807 : 12.8 805 12.0...3.
856 12,2 107 112.6
820 11.0 -(90 percentile) -807 100.0
826 TB 820 ee 6)
809 7.8 835 88.9
602 7.4 816 69.4
831 6.6 831 59.8
601 6.6 847 53.6
846 5.7 824 50.4
605 5.6 836 47.7
815 S25 810 42,0
840 5.5 808 36.6
858 5.4 844 36.3
842 Seed 605 36.0.
847 4.9 814 36.0
827 4.5 104 32.0
819 4.0 106 32.0
837 4.0 826 31.5
825 Set 852 29nd
812 3.5 101 29.0
823 3.4 815 27.3
103 32 843 24.8
841 cya 813 24.0
852 epee 838 22.7
811 2.8 841 20.6
844 Zn6
104 23
107 2.2
28 ea.# at <2.0 31 ea.# at <20.0
(*) recorded values enclosed |
(**) values are listed from the highest to the lowest.
xxxEND_PAGE:deq02_b216_2370_2887_190
VIRGIN ISLANDS
WATER
AND POWER
AUTHORITY
le Ga.
P.O, Box 1450, 5T, THOMAS
VIRGIN ISLANDS, U, 6. A. 00804 ~ 1450
2000 TELEPHONE: (340) 774-3562
FAX1 (340) 776-2723
February 25th.
Harold Mark
Department of Planning and Natural Resources
Division of Environmental Protection
Government of the Virgin Islands
1118 Water Gut Homes
Christiansted
St. Croix; Vel» 00820
Dear Mr. Mark,
Enclosed please find the calculated 90th percentile values
of Lead and Copper content in the St. Thomas Distribution
system, located in category Tier 3.
O£ the 60 sample sites 23 (38.3%) were collected from the
same locations as in Spring/99 sample collection.
Statistical account for the 60 sample sites are as follows:
18 (30.0%) Single Family Resident (SFR) before 1983
14 with cisterns attached.
5 ( 8.3%) Single Family Resident (SFR) after 1982
3 with cisterns attached.
37 (61.7%) Multi Family Resident/Business/Office Bldg.
33 with cisterns attached.
A total of 83.3% of the 60 sample sites were connected to
a cistern.
|
xxxEND_PAGE:deq02_b216_2370_2887_191
H. Mark page 2
February 25th, 2000
Also attached is a map of the St. Thomas distribution
system with sample site location.
Please call me is you have any questions at 774-3552
ext. 2313.
Sincerely,
Annelise Knudsen
Laboratory Supervisor
cc: Martin Ramirez, Superintendent, Water Distribution
Greg, Rhymer, Manager, Dept. of Environmental Affairs
Carol Aubin, DPNR/DEP. St, Thomas
|
xxxEND_PAGE:deq02_b216_2370_2887_192
Lead and Copper Monitoring Test Results (*)
Collected between January 11th. and February 3rd. 2000
Lead values (**): Copper values (**): i
Sample ID Lead (ppb) Sample ID Copper (ppb) |
938 65.4 938 257.4
950 11.3 939 185.6
922 14.7 928 110.8
S57 11.8 $10 98.9
952 10.8 606 79.2
939 10.0 948 76.8
958 9.9 -({90 percentile) -949 74.4
606 6.4 917 73.1 i
959 5.7 920 63.9 i
910 4.9 947 58.7
944 4.5 952 57.5
937 3.9 S46 56.7
949 3.6 919 53.2
936 3.4 922 50.4
949 2.7 937 47.8
9303 2.6 916 46.4
926 2.0 936 41.8
944 39.5
951 34.3
903 30.2
718 29.5
950 28.2
909 25,0
932 21.4
43 ea.# ab «2.0 36 @a.# at <20.0
{*) recorded values enclosed.
(**) values are listed from the highest to the lowest.
xxxEND_PAGE:deq02_b216_2370_2887_193
ASMNISS VIRGIN ISLANDS
Sire, WATER Wer
EQS ano POWER
wis” ~=AUTHORITY =
P.0 BOX 1ah0. 81 THOMAS
U.S. VIRGEN ISLANDS 00804-1450.
TELEPHONE: (340) 774-3552
FAX, (340) 776 2723
March 7th, 2001
Harold Mark
Department of Planning and Natural Resources
Division of Environmental Protection
Government of the Virgin Islands
1118 Water Gut Homes
Christiansted
St. Croix, V.I. 00820
Dear Mr. Mark,
Enclosed please find the calculated 90th percentile values
of Lead and Copper content in the St. Thomas Distribution
system, located in category Tier 3.
Reduced monitoring of 35 samples collected resulted in
the following values (90 percentile) for Lead 6.2 ppb
and for Copper 49.1 ppb. representing a deduction of
27% and 29% respectively from the values obtained in the
February 2000 Lead and Copper monitoring.
Statistical account for the 35 sample sites are as follows:
12 (34%) Single Family Resident (SFR) before 1983
1 ( 3%) Single Family Resident (SFR) after 1982
22 (63%) Multi Family Resident/Business/Office Bldg.
The majority of the sites were connected to a cistern,
Attached is a map of the St. Thomas Distribution system
with sample site locations.
Please call me if you have any questions at 774-3552
xt. 2313,
Sincerely, “- e
i . fea A Ge CA 2k, cae bee Cyt me,
Annelise Knudsen
Laboratory Supervisor
cc: Martin Ramirez, Superintendent, Water Distribution
Greg. Rhymer, Manager, Dept. of Environmental Affairs
Anibal Bermudez, DPNR/DEP, St. Thomas
BRANCH: P.O. BOX 1009, CHRISTIANSTED, ST. CROIX, U. S. VIRGIN ISLANDS 00820-1009
i
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xxxEND_PAGE:deq02_b216_2370_2887_194
PSR OI OTe EEE TCA NE
Sco shomanseraratetinite:
bets cinta sons ernie ee SON SE
St. Thomas Water Distribution System
Lead and Copper Monitoring Test Results (*)
Collected between January 23rd and February 16th 2001
Lead values (**) Copper values (**)
Sample ID Lead (ppb) Sample ID Copper (ppb)
613 25.6 613 154.2
020 12.4 O02 95.5
618 411.1 Q24 86.4
021 6.2 {90th percentile) 017 49.1
620 6.1 021 47.3
024 3.5 018 40.2
010 Sei 612 35.3
934598 2.8 618 24.1
008 25 010 23.0
004 23
027 2,3
002 2.2
018 2
22 samples at < 2.0 26 samples at < 20.2
(*) wvecorded values énclosed
(**) values are listed from highest to lowest.
xxxEND_PAGE:deq02_b216_2370_2887_195
90 % Before - 0.108 ppm After - 0.011 ppm
parts per million
Desalination Unit # 1
Lead results
0.40
T
0.35 +
0,30 +-
0.25 +
0.20 +
0.10 +
0.05 +
(0.00 45} 33,3 ane
FE 1993-no treatment Ha 1999-SeaQuest
TH-4 ALK-3 pH-67
xxxEND_PAGE:deq02_b216_2370_2887_196
90 % Before 0.021 - ppm After - 0.014
parts per million
Desalination Unit # 2
Lead results
0.20 T
0.18 +
0.16 a
0.14 +
0.124
7
0.104
0.08 +
0,04
0.02 +-
E23 1993 - No treatment 1999- SeaQuest
TH-1 ALK-3 pH-67
'
'
i
i
xxxEND_PAGE:deq02_b216_2370_2887_197
90% Before 0.948 ppm After - 0.1 ppm
parts per million
5.0 +
4.5 |
4,0 |
3.5 7
3.0 +
2.5 +
2.0 +
1.5 +
Desalination Unit # 1
Copper results
1993-no treatment 3 1999-SeaQuest
TH-1 ALK-3 pH-67
xxxEND_PAGE:deq02_b216_2370_2887_198
90 % Before - 0.3 88 ppm After - 0.227 ppm
Desalination Unit # 2
Copper results
0.8
0.7
0.6
poh
re)
)
1
t
()
uo} it Jad syed
0.3 +
0.1 +
EZ 1999- SeaQuest
[22 1993 - No treatment
TH-1 ALK-3 pH-67
xxxEND_PAGE:deq02_b216_2370_2887_199
CITY OF NEWBERRY
GEORGE HUGH CONNELLY WATER TREATMENT PLANT
$2] Highway121 + Sitverstreet, South Carolina 29146
Michael Rdelstein, National Sales and Development Manager
Aquz Smart, Inc .
4445 Commerce Drive
Atlanta, GA 30336
May 24, 2003
Dear Mr. Edelstein,
After using Seaquest for over one year, we have noticed the following changes in our system.
1, We've lowered our pH from 7.8-8.0 to 6,5 without any negative results, Our water quality is excellent.
2, We've reduced our caustic usage by 75%,
3, We've reduced our chlorine usage by 22%.
4, We've gotten off of chloramines and stopped using ammonia for better water quality.
3, Inthe year that we've been using SeaQuest, we've only had one limited outbreak of red water, which
‘was caused by a sudden spike of mental and orgenics in cur system, which cleared up very quickly,
Serene v0 ne Len Sod sraner-coenplatats, went peovloesty; ie yee Rayesthons ast Ay #0 :
6. ‘We've reduced our flushing considerable (in some areas every few months) to just once a year. |
7. We've visibly seen reduotion of corrosion and scale,
8. We've had an increase in chlorine residuals in our system.
9. Oar TYHMs average is 26% lower.
10, Our HAA average is stable.
11, Our lead and copper results pasted for viva reduced monitoring. “
Since we' ve been on SeaQuest, we have improved our overall water quality as stated using far less.
chemical in our water with better results and have saved the City of Newberry, SC a considerable |
amount of money. Thank you for a great product. |
David Hendrix
Superintendent
|
Phone (B03) 276-0311. + “FAX (803) 276-0312
xxxEND_PAGE:deq02_b216_2370_2887_200
City of Greer, SC
Tony Green, Water Plant Manager
864-848-5527
(MARCH 38, 2002 — APRIL 6, 2002)
Monitoring of 13 weekly samples taken in distribution for residual chlorine. This is the
result from the dead end line of the 13 weekly samples.
SeaQuest in use for the first 4 weeks!
1. Monitoring Results - First Week (MARCH 3 - 9, 2002) 0.05
This is a dead end line and has averaged this residual for 5 years!
2. Monitoring Results - Second Week (March 10 - 16, 2002) 0.05
Same dead end line
SEA QUEST PUT INTO SYSTEM THIS WEEK
3. Monitoring Results - Third Week (March 17 - 23, 2002) 0.13
Same dead end line
Nothing different treatment wise other than adding SEA QUEST
(NO flushing was done to this line!)
Cut Chlorine from 3 mg/L to 2.6 mg/L and Ammonia ratio from 4 to 1
to 5 to 1 (dropped from 90 Ibs to 70 Ibs per week)
4. Monitoring Results - Fourth Week (March 24 - 30, 2002) 0.60
Same dead end with the exception of feeding SEA QUEST
(Still no flushing)
5. Monitoring Results — Fifth Week (APRIL 1 - 6, 2002) 0.94
Same dead end but now SEA QUEST has been in use approximately 4 weeks
(With no flushing at this fine!)
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xxxEND_PAGE:deq02_b216_2370_2887_201
City of Greer, SC
Tony Green, Water Plant Manager
864-848-5527
MEMORANDUM