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AMENDMENT NUMBER 1 TO WORK ORDER 6 )
This Amendment Number 1 to Work Order 6 ( "Amendment") is entered into as of
this2rd6y of August , 200 5 ( " Effective Date") pursuant to that certain Continuing
Contract Agreement for Professional Services entered into as of April 6 , 2004
("Agreement") , by and between Indian River County , a political subdivision of the State of
Florida ( "COUNTY") and Kimley- Horn and Associates Inc . ( "CONSULTANT") .
1 . The COUNTY has selected the Consultant to perform the professional
services set forth in Work Order Number 6 dated February 8 , 2005 ,
2 , The COUNTY and the Consultant desire to amend Work Order Number 6
as set forth in Attachments 1 and 2 attached to this Amendment and made a part hereof by
this reference , all in accordance with the terms and provisions set forth in the Agreement .
3 . From and after the Effective Date of this Amendment , Work Order Number
6 is amended as set forth in this Amendment . Pursuant to paragraph 1 . 4 of the Agreement ,
nothing contained in any Work Order shall conflict with the terms of the Agreement and the
terms of the Agreement shall be deemed to be incorporated in each individual Work Order
as if fully set forth herein .
IN WITNESS WHEREOF , the parties hereto have executed this Amendment as of
the Effective Date first written above .
CONSULTANT BOARD OF COUNTY COMMISSIONERS
Kimley- Horn and Associates Inc . OF INDIAN RIVER COUNTY
2 /
/V
By By 4 -
vrG � Evp Thomas S . Lowther , Chairman
Title : Aa
BCC Approval Date 08 - 02 - 2005
Attest : J . K . Barton , Clerk of Court
133
� .
Deputy Clerk
Approved :
ACA
Jo A . Baird , County Administrator
A roved as to form a%d legal sufficie y :
rian E . Fe unty Attorney
HA04457200mcowAmendment # 1 . doc
1
Attachment 1
To
Amendment 1
To
Work Order Number 6
Proposed Bioassay Protocol
for
Indian River County Utilities South RO Plant
Byproduct Treatment Evaluation
Project Description and Understanding
The following provides a narrative description of a testing protocol proposed to be conducted on the water
treatment byproduct produced at the Indian River County Utilities South Reverse Osmosis Water
Treatment Plant. The intent of this testing protocol is to determine if it can be demonstrated that the
current treatment process applied to this byproduct is the cause of a random but repeated failures in
bioassay testing . The current treatment process injects sodium hypochlorite into the concentrate stream to
reduce hydrogen sulfide and following that injects diffused air under pressure to elevate dissolved oxygen
in the byproduct stream. There is a possibility that random but repeated bioassay test failures have been
caused by any of the following.
• Inadequate reduction of hydrogen sulfide .
• Excess chlorine remaining after reduction of hydrogen sulfide .
• Contaminant introduced into the byproduct stream contained in commercially available sodium
hypochlorite .
• Contaminant introduced into the byproduct stream through the compressed air system.
Should it be demonstrated that the current byproduct treatment process is contributing to previous
bioassay test failures , a new treatment system is proposed which involves only aeration of the byproduct
stream using a counter current packed tower degasifier. A treatment system of this configuration will
remove hydrogen sulfide and elevate dissolved oxygen concentration in the byproduct stream without
adding chemicals to the stream which may introduce contaminants to the byproduct .
SCOPE OF SERVICES
The basis of this proposed testing protocol is to conduct simultaneous bioassay tests on samples of
byproduct, one taken prior to application of the current treatment process and the second taken after
application of the current treatment process . The samples will be taken such that they represent the same
byproduct produced by the reverse osmosis plant through the use of sample points which are
approximately 500 feet apart in a pipeline having a velocity of 5 fps . The sample taken after application
of the current byproduct treatment process would be subjected to bioassay testing without further
treatment . The sample taken prior to application of current byproduct treatment will be stripped of
hydrogen sulfide and have dissolved oxygen levels increased by aeration , simulating the proposed
byproduct treatment process . This simulated treatment process will consist of a vigorous aeration using
an air stone and aquarium grade air pump until all hydrogen sulfide is removed from the byproduct
sample .
H :\044572009\Scope\Bioassay testing - Amendment Ldoc
Sampling and testing will be conducted every three weeks in order to gain information and data in a
relatively short period of time . The three-week interval allows test results to be received prior to starting
the next round of testing .
Bioassay tests will be conducted in using a screening test on both samples . The specific purpose in this
testing program is to identify a difference between the current and proposed byproduct treatment process .
Screening tests will provide information on the relative difference in toxicity between the two samples
being tested . Following the conclusion of approximately six rounds of the screening testing on parallel
samples , a definitive test will be conducted on byproduct subjected to the proposed treatment process to
determine its LC 50 .
Sampling will be a grab sample so as to not introduce differences in injected substances through the
current byproduct treatment process . Sampling will be rotated throughout this program with samples
taken at 8 a . m. , 2 p . m. , and 8 p . m. on a rotating basis .
FEES :
Consultant will provide these Services as described herein on a lump sum basis for the following fees :
Task Fee
I . Coordination , Sampling, and Evaluation $ 11 , 280
2 . Lab Costs and Equipment $ 99900
Total $ 21 , 180
We will provide these services in accordance with our Continuing Services Contract with Indian River
County date April 6th, 2004 and Kimley-Horn and Associates , Inc .
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