HomeMy WebLinkAboutReso 84-2022 (22-453)-1-
CONTRACT PURCHASING AGREEMENT
FOR THE PURCHASE OF
FERRIC CHLORIDE SOLUTION FOR THE TREATMENT OF WASTEWATER
THIS AGREEMENT is made this 8th day of June, 2022, by and between the City of South San
Francisco, California, hereinafter called the "CITY" and Kemira Water Solutions, Inc. 4321 W.6th
St. Lawrence, KS 66049 hereinafter called the "SELLER", at South San Francisco, County of San
Mateo, State of California.
WHEREAS, THE City has determined a need for approximately 50,000 gallons annually of ferric
chloride solution delivered in bulk trailer loads to be used as a coagulant in the treatment of
wastewater.
WHEREAS, THE SELLER has the capability of delivering ferric chloride solution in the amount as
required and in a timely manner.
NOW, THEREFORE, in consideration of the mutual promises and agreements hereinafter set forth, the
parties agree as follows:
1. Obligations: The CITY agrees to buy one hundred percent (100%) of the City’s annual volume
requirement from the SELLER. SELLER agrees to sell, and deliver approximately 50,000 gallons of
ferric chloride solution to the City in accordance with SELLER’S schedule of delivery.
2. Shipping Terms:
(a)SELLER shall ship each shipment of PRODUCT FOB Delivered.
(b) All shipments of ferric chloride solution shall be accompanied with the following:
i. Bill of Lading
ii. Certified Analysis indicating ferric chloride
iii. Weighmaster’s certificate of weight
iv. Applicable regulatory documents
3.SELLER additionally agrees to comply with all provisions contained in City's specifications,
which include a requirement that insurance be obtained in the type and amount set forth in the
specifications and Section 14 below.
4.Purchase Price: The City agrees to pay to the SELLER, in accordance with the following:
PRODUCT: Ferric Chloride Solution (37% to 42% by weight)
Ship To: Water Quality Control Plant, 195 Belle Air Road, South San Francisco Ca. 94080
Unit Price exclusive of all taxes: $3.04 per gallon ($1,217.00 per dry ton).
Quantity: approximately 50,000 gallons annually.
Containers: PRODUCT delivered in bulk load (approximately 4,000 gallons per tanker
truck/trailer load).
EXHIBIT A
CONTRACT PURCHASING AGREEMENT
Page 2
NTE: The total compensation for products purchased under this Agreement shall not exceed
$152,000.
5. Taxes: SELLER shall pay all applicable federal, state, and local taxes which may be chargeable
against the delivery of the PRODUCT listed herein.
6. Quantity: The quantity of PRODUCT received, and for which the CITY shall pay SELLER,
shall be measured in wet pounds by SELLER’S scales. Any clears of shortage shall be deemed waived
unless made in writing and received by SELLER within fifteen (15) days from CITY’S receipt of the
shipment in question. Shortages of less than 1% of the net weight of PRODUCTs shall not be
contested. The parties agree to exercise best efforts in good faith to resolve any discrepancies regarding
the weight of any shipment.
7. Purchase Orders: The CITY shall issue purchase orders to SELLER authorizing the
SELLER to provide the PRODUCTs in accordance with this agreement. SELLER will make its best
efforts to ship PRODUCT within five (5) business days days after receiving the CITY’S purchase
order.
8. Pricing: The prices herein specified are firm for 12 months following execution of this
agreement and includes all delivery costs. All prices are exclusive of tax. There is no pesticide fee for
ferric chloride solutions. All prices are effective based upon the shipment date of the PRODUCT.
9. Payment: The price for the PRODUCT shall be invoiced in United States currency and will
be paid to the SELLER at the address indicated on the SELLER’S invoice. SELLER reserves the
right, among other available remedies, either to cancel this contract or suspend further deliveries under
this contract in the event the CITY fails to pay for any one shipment when payment becomes due and
upon written notice of such failure, the CITY does not pay the balance.
10. Quality: The SELLER agrees that the PRODUCT supplied pursuant to this Agreement shall be
free of sediment and solid particles and shall not contain anything that will adversely affect or interfere
with normal operation of the City’s biological treatment processes or be injurious to the ferric chloride
feeding equipment. SELLER further warrants that (A) all PRODUCT shall comply with the
Specifications, (B) SELLER has good title to all PRODUCT delivered and all PRODUCT delivered
are free from liens and other encumberances, and (C) SELLER’s delivery and installation of the
PRODUCT will be in strict conformity with all applicable state, local and federal laws.
The CITY shall be obligated to purchase only that PRODUCT which meets the Specifications and
requirements listed above. Any claim that any PRODUCT does not meet Specifications or meet the
CITY’s requirements shall be deemed waived unless made in writing and received by SELLER within
fifteen (15) days from the CITY’S receipt of the PRODUCT in question.
11. Non-Conforming PRODUCT: SELLER shall immediately replace all PRODUCT not meeting
Specifications, shall reimburse the CITY for the reasonable shipping costs associated with the CITY’S
CONTRACT PURCHASING AGREEMENT
Page 3
return of non-conforming PRODUCT, shall pay for the shipping costs associated with delivering to the
CITY the replacement PRODUCT and shall be responsible for the disposal of any non-conforming
PRODUCT and associated containers returned by the CITY. If SELLER, after notice of non-
conformity, fails to proceed promptly to provide conforming product, the CITY may perform all work
necessary to effectuate such replacement and recover the cost from SELLER.
12. PRODUCT Testing: SELLER shall analyze and retain a clearly-marked, representative sample
from each shipment of PRODUCT. SELLER shall retain each sample and such sample's test results
for three (3) months and, upon written request, shall provide such to the CITY. The parties agree to
exercise best efforts in good faith to resolve any discrepancies between their respective test results
regarding any sample and/or shipment.
13. Indemnity: To the fullest extent allowed by law, the SELLER and its employees,
subcontractors, and agents shall defend, indemnify, and save and hold harmless the CITY, its officers,
agents, employees and volunteers from any claims, suits or actions of every name, kind and description
brought forth, or on account of, injuries to or death of any person (including but not limited to workers
and the public), or damage to property, resulting from or arising out of SELLER’s or its personnel,
employees, agents, or subcontractors’ willful misconduct or negligent act or omission while engaged in
the performance of services described in this Request for Bids and/or pursuant to this Agreement,
except those matters arising from the CITY’s sole negligence or willful misconduct. The parties intend
that this provision shall be broadly construed.
14. Insurance: Prior to beginning the Work and continuing throughout the term of this Agreement,
SELLER shall, at SELLER’S sole cost and expense, furnish the CITY with certificates of insurance
evidencing that SELLER has obtained and maintains insurance in the following amounts:
A. Workers’ Compensation that satisfies the minimum statutory limits.
B. Commercial General Liability and Property Damage Insurance in an amount not less than ONE
MILLION DOLLARS ($1,000,000) combined single limit per occurrence, TWO MILLION DOLLARS
($2,000,000) annual aggregate, for bodily injury, property damage, products, completed operations and
contractual liability coverage. The policy shall also include coverage for liability arising out of the use
and operation of any CITY-owned or CITY-furnished equipment used or operated by the SELLER, its
personnel, agents or subcontractors.
C. Comprehensive automobile insurance in an amount not less than ONE MILLION DOLLARS
($1,000,000) per occurrence for bodily injury and property damage including coverage for owned and non-
owned vehicles.
All insurance policies shall be written on an occurrence basis and shall name the CITY
INDEMNITIEES as additional insureds and any CITY insurance shall be secondary and in excess to
SELLER’s insurance. If the SELLER’s insurance policy includes a self-insured retention that must be
paid by a named insured as a precondition of the insurer’s liability, or which has the effect of providing
CONTRACT PURCHASING AGREEMENT
Page 4
that payments of the self-insured retention by others, including additional insureds or insurers do not
serve to satisfy the self-insured retention, such provisions must be modified by special endorsement so
as to not apply to the additional insured coverage required by this agreement so as to not prevent any
of the parties to this agreement from satisfying or paying the self-insured retention required to be paid
as a precondition to the insurer’s liability. Additionally, the certificates of insurance must note
whether the policy does or does not include any self-insured retention and also must disclose the
deductible.
The CITY Risk Manager, in writing, may approve a variation in the foregoing insurance requirements. A
valid and executed approval by Risk Manager must accompany this Purchase Agreement for a variation to
be binding.
15. Prevailing Wage: Where applicable, the wages to be paid for a day's work to all classes of laborers,
workmen, or mechanics on the work contemplated by this Purchase Agreement, shall be not less than the
prevailing rate for a day’s work in the same trade or occupation in the locality within the state where the
work hereby contemplates to be performed as determined by the Director of Industrial Relations pursuant
to the Director’s authority under Labor Code Section 1770, et seq. Each laborer, worker or mechanic
employed by SELLER or by any subcontractor shall receive the wages herein provided for. The SELLER
shall pay two hundred dollars ($200), or whatever amount may be set by Labor Code Section 1775, as may
be amended, per day penalty for each worker paid less than prevailing rate of per diem wages. The
difference between the prevailing rate of per diem wages and the wage paid to each worker shall be paid by
the SELLER to each worker.
An error on the part of an awarding body does not relieve the SELLER from responsibility for payment of
the prevailing rate of per diem wages and penalties pursuant to Labor Code Sections 1770-1775. The CITY
will not recognize any claim for additional compensation because of the payment by the SELLER for any
wage rate in excess of prevailing wage rate set forth. The possibility of wage increases is one of the
elements to be considered by the SELLER.
16. Damage To City Facilities: Damage to CITY or public facilities or private property
caused by the SELLER in the delivery of the PRODUCT shall be repaired and/or replaced in kind by
the SELLER at no cost to the CITY.
17. Force Majeure/Hardship/Other Sources: If the CITY’S ability to take or SELLER’S ability to
deliver the PRODUCT is impaired due to circumstances beyond reasonable control, including but not
limited to fire, flood, Government action, accident, labor disputes or shortage, or inability to obtain
from normal sources raw material, equipment, or transportation, the one so affected shall be excused
without liability from taking or making delivery to the extent of such impairment. If SELLER’S ability
to deliver PRODUCT is reduced due to any such circumstance, SELLER may reduce the contract
quantity in any year upon written notice to the CITY if SELLER deems such reduction necessary to
effect a fair allocation of the PRODUCT to users/purchasers thereof, in which case the CITY’S
obligation to purchase PRODUCT from SELLER hereunder shall be reduced and adjusted
accordingly. Notwithstanding, if SELLER’S ability to deliver PRODUCT is reduced due to any such
CONTRACT PURCHASING AGREEMENT
Page 5
circumstance, then the CITY may obtain PRODUCT from another source, and the quantity of
PRODUCT obtained from another source will be credited to any minimum quantity requirement set
forth in this Agreement for the respective contract year as if such had been purchased from SELLER.
If the CITY’S inability to take PRODUCT is excused under this subparagraph, SELLER’S obligation
to sell PRODUCT to the CITY hereunder shall be reduced and adjusted accordingly.
18. Site Safety and Cleanup: The delivery and installation site shall be kept clean and free of
hazards at all times during installation. After installation is completed at the site, SELLER shall clean
the surrounding area to the condition prior to installation.
19. Period and Renewal: This AGREEMENT is for the period beginning July 1, 2022 and ending
June 30, 2023. This AGREEMENT may be extended or amended by mutual agreement in writing
between the parties on the same terms and conditions through June 30, 2024 if such mutual agreement
is reached before expiration of the current agreement.
20. Notices: All notices concerning the subject matter hereof shall be made in writing and shall be
deemed to have been duly given (i) on the date of service if served personally on the party to whom
notice is to be given, (ii) on the date of service if delivery is made by overnight courier on the party to
whom notice is to be given at the address set forth above, or (iii) five (5) days after the date of
depositing the same in the U.S. mail and mailed to the Party to whom notice is to be given, by first
class mail, registered or certified, postage prepaid, and properly addressed as sat forth above. All
notices to be given with respect to this Agreement shall be addressed to:
To the City Contract Administrator:
Brian Schumacker, Plant Superintendent
Water Quality Control Plant
195 Belle Air Road,
South San Francisco, CA 94080
To Seller:
Kemira Water Solutions
Attention: Tina Imbrogno
4321 W. 6th Street
Lawrence, KS 66049
21. Entire Agreement: This contract, along with all exhibits attached hereto which are incorporated
herein by this reference, sets forth the entire and complete agreement regarding the subject matter
hereof and may be executed in identical counterparts.
22. Waivers: Waivers of a breach or default under this Agreement shall not constitute a
continuing waiver or a waiver of a subsequent breach of the same or any other provision of this
Agreement.
CONTRACT PURCHASING AGREEMENT
Page 6
23. Assignment: Neither party shall assign or delegate its rights or obligations under this contract
without the prior written consent of the other party, which consent shall not be unreasonably withheld.
Notwithstanding the foregoing, should substantially all of the assets of either party be purchased or
otherwise acquired by an unrelated entity or person, such party may assign and delegate its rights and
obligations hereunder to the acquiring person or entity.
24. Applicable Law: This Agreement shall be construed and enforced in accordance with the laws
of the State of California without reference to the conflict or choice of law principles thereof. The
jurisdiction for any litigation arising hereunder shall be in the state of California and venue shall be in
San Mateo County.
25. Modifications: No modification, waiver, termination, or amendment of this Agreement is
effective unless made in writing signed by the City and the SELLER.
26. Attorneys' Fees: If any action at law and equity shall be brought to recover for or on the
account of any breach of, or to enforce or interpret any of the covenants, terms or conditions of this
contract, the prevailing party shall be entitled to recover from the other party reasonable attorney's
fees.
27. Equivalent Pricing: SELLER assures the CITY that it will not offer lower prices to any
Municipal entity of comparable volume, shipping distances and like chemistry without adjusting same
for the CITY. Due to other existing contractual obligations, there may instances where another like
Municipality has a lower price but such contract will not be renewed or re-bid below The CITY’S
price, without making an adjustment to the CITY.
28. Severability: If any term of this Agreement is held invalid by a court of competent jurisdiction,
the remainder of this Agreement shall remain in effect.
CONTRACT PURCHASING AGREEMENT
Page 7
Exhibit A. (Attached): PRODUCT Specifications
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their
representatives as of this day first written above.
CITY OF SOUTH SAN FRANCISCO: SELLER:
A Municipal Corporation Kemira Water Solutions, Inc.
By: ___________________________ By: _______________________________
Title: Mike Futrell, City Manager Title: _____________________________
ATTEST:
________________________
City Clerk
Approved as to Form:
____________________________
City Attorney
CONTRACT PURCHASING AGREEMENT
Page 8
EXHIBIT “A” PRODUCT SPECIFICATIONS
Ferric Chloride Solution:
CAS Number: 7705-08-0
Chemical Formula: FeCl3
Molecular Weight: 162.20
Specific Gravity (@ 20o C): 1.300 - 1.500
%FeCl3: 37% to 42% by weight
%FeCl2: <2.5%
%HCl: <1.5%
% Insoluables Less Than <0.25%
Manufactured and Formulated by:
Thatcher Company of California, Inc., Salt Lake City, UT.
Substitutions of PRODUCT of dissimilar nature are not permitted.
-1-
CONTRACT PURCHASING AGREEMENT
FOR THE PURCHASE OF
SODIUM HYPOCHLORITE SOLUTION AND SODIUM BISULFITE SOLUTION
THIS AGREEMENT is made this 8th day of June, 2022, by and between the City of South San
Francisco, California, hereinafter called the "CITY" and Univar USA Inc., 8201 South 212th Street,
Kent, Washington, 98032-1994 hereinafter called the "SELLER", at South San Francisco, County of
San Mateo, State of California.
WHEREAS, THE City has determined a need for approximately 450,000 gallons annually of sodium
hypochlorite (minimum 12.5 % chlorine solution) delivered in bulk load using tanker trucks to be used
as a disinfecting agent for the treatment of wastewater.
WHEREAS, THE City has determined a need for approximately 325,000 gallons annually of sodium
bisulfite (minimum 25 % solution by weight) delivered in bulk load using tanker trucks to be used as a
de-chlorinating agent for the treatment of wastewater.
WHEREAS, THE SELLER has the capability of delivering the required volume of sodium
hypochlorite (minimum 12.5% chlorine solution) in the amounts as required and in a timely manner.
WHEREAS, THE SELLER has the capability of delivering the required volume of sodium bisulfite
(minimum 25% solution by weight) in the amounts as required and in a timely manner.
NOW, THEREFORE, in consideration of the mutual promises and agreements hereinafter set forth, the
parties agree as follows:
1. Obligations: The CITY agrees to buy one hundred percent (100%) of the City’s annual volume
requirement from the SELLER. SELLER agrees to sell, and deliver approximately 450,000 gallons of
sodium hypochlorite solution (minimum available chlorine of 12.5% by weight) to the City in
accordance with SELLER’S schedule of delivery.
The CITY agrees to buy one hundred percent (100%) of the City’s annual volume requirement
from the SELLER. SELLER agrees to sell, and deliver approximately 325,000 gallons of
sodium bisulfite solution (minimum available 25% by weight) to the CITY in accordance with
The SELLER’S schedule of delivery.
2. Shipping Terms:
(a)SELLER shall ship each shipment of PRODUCT FOB Delivered.
(b) All shipments of sodium hypochlorite and sodium bisulfite shall be accompanied with the
following:
i. Bill of Lading
ii. Certified Analysis indicating Sodium Hypochlorite and Sodium Bisulfite
EXHIBIT B
CONTRACT PURCHASING AGREEMENT
Page 2
iii. Weighmaster’s certificate of weight
iv. Applicable regulatory documents
3. SELLER additionally agrees to comply with all provisions contained in City's specifications,
which include a requirement that insurance be obtained in the type and amount set forth in the
specifications and Section 14 below.
4. a) Purchase Price: The City agrees to pay to the SELLER, in accordance with the following:
Product: Sodium Hypochlorite Solution (12.5% available chlorine by weight).
Ship To: Water Quality Control Plant, 195 Belle Air Road, South San Francisco Ca. 94080
Unit Price exclusive of all taxes: $1.4916/gallon
$.14916/lb
Quantity: approximately 450,000 gallons annually.
Containers: PRODUCT delivered in bulk load (approximately 4,500 gallons per tanker
truck/trailer load).
b) Purchase Price: The City agrees to pay the SELLER, in accordance with the following:
Product: Sodium Bisulfite Solution (25% available by weight).
Ship to: Water Quality Control Plant, 195 Belle Air Road, South San Francisco Ca. 94080
Unit Price exclusive of all taxes: $1.4750/gallon.
$.1486/lb
Quantity: approximately 325,000 gallons annually.
Containers: delivered in bulk load, approximately 4,500 gallons per tanker truck/trailer load
NTE: The total compensation for products purchased under this Agreement shall not exceed
$1,150,595.00
5. Taxes: SELLER shall pay all applicable federal, state, and local taxes which may be chargeable
against the delivery of the PRODUCT listed herein.
6. Quantity: The quantity of PRODUCT received, and for which the CITY shall pay SELLER,
shall be measured in wet pounds by SELLER’S scales. Any clears of shortage shall be deemed waived
unless made in writing and received by SELLER within fifteen (15) days from CITY’S receipt of the
shipment in question. Shortages of less than 1% of the net weight of PRODUCTs shall not be
contested. The parties agree to exercise best efforts in good faith to resolve any discrepancies regarding
the weight of any shipment.
7. Purchase Orders: The CITY shall issue purchase orders to SELLER authorizing the
SELLER to provide the PRODUCTs in accordance with this agreement. SELLER will make its best
efforts to ship PRODUCT within five (5) business days days after receiving the CITY’S purchase
order.
8. Pricing: The prices herein specified are firm for 12 months following execution of this
CONTRACT PURCHASING AGREEMENT
Page 3
agreement and includes all delivery costs. All prices are exclusive of tax and pesticide fee. All prices
are effective based upon the shipment date of the PRODUCT.
9. Payment: The price for the PRODUCT shall be invoiced in United States currency and will
be paid to the SELLER at the address indicated on the SELLER’S invoice. SELLER reserves the
right, among other available remedies, either to cancel this contract or suspend further deliveries under
this contract in the event the CITY fails to pay for any one shipment when payment becomes due and
upon written notice of such failure, the CITY does not pay the balance.
10. Quality: The SELLER agrees that the PRODUCT supplied pursuant to this Agreement shall be
free of sediment and solid particles and shall not contain anything that will adversely affect or interfere
with normal operation of the City’s biological treatment processes or be injurious to the ferric chloride
feeding equipment. SELLER further warrants that (A) all PRODUCT shall comply with the
Specifications and be of good merchantable quality, fit for the purpose for which sold, (B) SELLER
has good title to all PRODUCT delivered and all PRODUCT delivered are free from liens and other
encumberances, and (C) SELLER’s delivery and installation of the PRODUCT will be in strict
conformity with all applicable state, local and federal laws.
The CITY shall be obligated to purchase only that PRODUCT which meets the Specifications and
requirements listed above. Any claim that any PRODUCT does not meet Specifications or meet the
CITY’s requirements shall be deemed waived unless made in writing and received by SELLER within
fifteen (15) days from the CITY’S receipt of the PRODUCT in question.
11. Non-Conforming PRODUCT: SELLER shall immediately replace all PRODUCT not meeting
Specifications, shall reimburse the CITY for the reasonable shipping costs associated with the CITY’S
return of non-conforming PRODUCT, shall pay for the shipping costs associated with delivering to the
CITY the replacement PRODUCT and shall be responsible for the disposal of any non-conforming
PRODUCT and associated containers returned by the CITY. If SELLER, after notice of non-
conformity, fails to proceed promptly to provide conforming product, the CITY may perform all work
necessary to effectuate such replacement and recover the cost from SELLER.
12. PRODUCT Testing: SELLER shall analyze and retain a clearly-marked, representative sample
from each shipment of PRODUCT. SELLER shall retain each sample and such sample's test results
for three (3) months and, upon written request, shall provide such to the CITY. The parties agree to
exercise best efforts in good faith to resolve any discrepancies between their respective test results
regarding any sample and/or shipment.
13. Indemnity: Except for any loss, damage or expense arising solely from the gross negligence or
willful misconduct of the CITY, or any employee, agent or independent contractor of the CITY
SELLER shall, to the fullest extent permitted by law, indemnify, defend and hold harmless the CITY
and its officers, employees, agents and independent contractors (“CITY INDEMNITEES”), from and
against any and all claims, loss, damage or expense, including reasonable attorney's fees, arising from
or relating to, or caused by the performance of SELLER under this Contract.
CONTRACT PURCHASING AGREEMENT
Page 4
14. Insurance: Prior to beginning the Work and continuing throughout the term of this Agreement,
SELLER shall, at SELLER’S sole cost and expense, furnish the CITY with certificates of insurance
evidencing that SELLER has obtained and maintains insurance in the following amounts:
A. Workers’ Compensation that satisfies the minimum statutory limits.
B. Commercial General Liability and Property Damage Insurance in an amount not less than ONE
MILLION DOLLARS ($1,000,000) combined single limit per occurrence, TWO MILLION DOLLARS
($2,000,000) annual aggregate, for bodily injury, property damage, products, completed operations and
contractual liability coverage. The policy shall also include coverage for liability arising out of the use
and operation of any CITY-owned or CITY-furnished equipment used or operated by the SELLER, its
personnel, agents or subcontractors.
C. Comprehensive automobile insurance in an amount not less than ONE MILLION DOLLARS
($1,000,000) per occurrence for bodily injury and property damage including coverage for owned and non-
owned vehicles.
All insurance policies shall be written on an occurrence basis and shall name the CITY
INDEMNITIEES as additional insureds and any CITY insurance shall be secondary and in excess to
SELLER’s insurance. If the SELLER’s insurance policy includes a self-insured retention that must be
paid by a named insured as a precondition of the insurer’s liability, or which has the effect of providing
that payments of the self-insured retention by others, including additional insureds or insurers do not
serve to satisfy the self-insured retention, such provisions must be modified by special endorsement so
as to not apply to the additional insured coverage required by this agreement so as to not prevent any
of the parties to this agreement from satisfying or paying the self-insured retention required to be paid
as a precondition to the insurer’s liability. Additionally, the certificates of insurance must note
whether the policy does or does not include any self-insured retention and also must disclose the
deductible.
The CITY Risk Manager, in writing, may approve a variation in the foregoing insurance requirements. A
valid and executed approval by Risk Manager must accompany this Purchase Agreement for a variation to
be binding.
15. Prevailing Wage: Where applicable, the wages to be paid for a day's work to all classes of laborers,
workmen, or mechanics on the work contemplated by this Purchase Agreement, shall be not less than the
prevailing rate for a day’s work in the same trade or occupation in the locality within the state where the
work hereby contemplates to be performed as determined by the Director of Industrial Relations pursuant
to the Director’s authority under Labor Code Section 1770, et seq. Each laborer, worker or mechanic
employed by SELLER or by any subcontractor shall receive the wages herein provided for. The SELLER
shall pay two hundred dollars ($200), or whatever amount may be set by Labor Code Section 1775, as may
be amended, per day penalty for each worker paid less than prevailing rate of per diem wages. The
difference between the prevailing rate of per diem wages and the wage paid to each worker shall be paid by
CONTRACT PURCHASING AGREEMENT
Page 5
the SELLER to each worker.
An error on the part of an awarding body does not relieve the SELLER from responsibility for payment of
the prevailing rate of per diem wages and penalties pursuant to Labor Code Sections 1770-1775. The CITY
will not recognize any claim for additional compensation because of the payment by the SELLER for any
wage rate in excess of prevailing wage rate set forth. The possibility of wage increases is one of the
elements to be considered by the SELLER.
16. Damage To City Facilities: Damage to CITY or public facilities or private property
caused by the SELLER in the delivery of the PRODUCT shall be repaired and/or replaced in kind by
the SELLER at no cost to the CITY.
17. Force Majeure/Hardship/Other Sources: If the CITY’S ability to take or SELLER’S ability to
deliver the PRODUCT is impaired due to circumstances beyond reasonable control, including but not
limited to fire, flood, Government action, accident, labor disputes or shortage, or inability to obtain
from normal sources raw material, equipment, or transportation, the one so affected shall be excused
without liability from taking or making delivery to the extent of such impairment. If SELLER’S ability
to deliver PRODUCT is reduced due to any such circumstance, SELLER may reduce the contract
quantity in any year upon written notice to the CITY if SELLER deems such reduction necessary to
effect a fair allocation of the PRODUCT to users/purchasers thereof, in which case the CITY’S
obligation to purchase PRODUCT from SELLER hereunder shall be reduced and adjusted
accordingly. Notwithstanding, if SELLER’S ability to deliver PRODUCT is reduced due to any such
circumstance, then the CITY may obtain PRODUCT from another source, and the quantity of
PRODUCT obtained from another source will be credited to any minimum quantity requirement set
forth in this Agreement for the respective contract year as if such had been purchased from SELLER.
If the CITY’S inability to take PRODUCT is excused under this subparagraph, SELLER’S obligation
to sell PRODUCT to the CITY hereunder shall be reduced and adjusted accordingly.
18. Site Safety and Cleanup: The delivery and installation site shall be kept clean and free of
hazards at all times during installation. After installation is completed at the site, SELLER shall clean
the surrounding area to the condition prior to installation.
19. Period and Renewal: This AGREEMENT is for the period beginning July 1, 2022, and ending
June 30, 2021. This AGREEMENT may be extended or amended by mutual agreement in writing
between the parties on the same terms and conditions through June 30, 2023, if such mutual agreement
is reached before expiration of the current agreement.
20. Notices: All notices concerning the subject matter hereof shall be made in writing and shall be
deemed to have been duly given (i) on the date of service if served personally on the party to whom
notice is to be given, (ii) on the date of service if delivery is made by overnight courier on the party to
whom notice is to be given at the address set forth above, or (iii) five (5) days after the date of
depositing the same in the U.S. mail and mailed to the Party to whom notice is to be given, by first
class mail, registered or certified, postage prepaid, and properly addressed as sat forth above. All
CONTRACT PURCHASING AGREEMENT
Page 6
notices to be given with respect to this Agreement shall be addressed to:
To the City Contract Administrator:
Brian Schumacker, Plant Superintendent
Water Quality Control Plant
195 Belle Air Road,
South San Francisco, CA 94080
To Seller:
Univar USA Inc.
8201 S. 212th Street
Kent, WA 98032
21. Entire Agreement: This contract, along with all exhibits attached hereto which are incorporated
herein by this reference, sets forth the entire and complete agreement regarding the subject matter
hereof and may be executed in identical counterparts.
22. Waivers: Waivers of a breach or default under this Agreement shall not constitute a
continuing waiver or a waiver of a subsequent breach of the same or any other provision of this
Agreement.
23. Assignment: Neither party shall assign or delegate its rights or obligations under this contract
without the prior written consent of the other party, which consent shall not be unreasonably withheld.
Notwithstanding the foregoing, should substantially all of the assets of either party be purchased or
otherwise acquired by an unrelated entity or person, such party may assign and delegate its rights and
obligations hereunder to the acquiring person or entity.
24. Applicable Law: This Agreement shall be construed and enforced in accordance with the laws
of the State of California without reference to the conflict or choice of law principles thereof. The
jurisdiction for any litigation arising hereunder shall be in the state of California and venue shall be in
San Mateo County.
25. Modifications: No modification, waiver, termination, or amendment of this Agreement is
effective unless made in writing signed by the City and the SELLER.
26. Attorneys' Fees: If any action at law and equity shall be brought to recover for or on the
account of any breach of, or to enforce or interpret any of the covenants, terms or conditions of this
contract, the prevailing party shall be entitled to recover from the other party reasonable attorney's
fees.
27. Equivalent Pricing: SELLER assures the CITY that it will not offer lower prices to any
Municipal entity of comparable volume, shipping distances and like chemistry without adjusting same
for the CITY. Due to other existing contractual obligations, there may instances where another like
CONTRACT PURCHASING AGREEMENT
Page 7
Municipality has a lower price but such contract will not be renewed or re-bid below The CITY’S
price, without making an adjustment to the CITY.
28. Severability: If any term of this Agreement is held invalid by a court of competent jurisdiction,
the remainder of this Agreement shall remain in effect.
CONTRACT PURCHASING AGREEMENT
Page 8
Exhibit A. (Attached): PRODUCT Specifications
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their
representatives as of this day first written above.
CITY OF SOUTH SAN FRANCISCO: SELLER:
A Municipal Corporation Univar USA, Inc.
By: ___________________________ By: _______________________________
Title: Mike Futrell, City Manager Title: _____________________________
ATTEST:
________________________
City Clerk
Approved as to Form:
____________________________
City Attorney
CONTRACT PURCHASING AGREEMENT
Page 9
EXHIBIT “A” PRODUCT SPECIFICATIONS
Sodium Hypochlorite 12.5% Solution (by weight)
as NaOCl (%wt) 12.5 - 13.2
Available Chlorine (%wt) 11.9 - 12.6
Available Chlorine (%vol) 14.3 - 15.3
Available Chlorine
grams/liter 143 - 153
Excess Caustic (%wt) 0.25 - 0.80
Specific Gravity @ 60°F 1.197 - 1.220
pH 12.0 - 13.0
Iron (Fe) ppm <0.5
Nickel (Ni) ppm <0.2
Copper (Cu) ppm <0.2
Mercury (Hg) ppb 0.001 - 0.003
Sodium Chloride (NaCl)% <15.0
Substitutions of product of dissimilar nature are not permitted.
Sodium Bisulfite 25% Solution (by weight)
% Sodium Bisulfite: 25%
% Sulfur Dioxide (SO2) Equivalent 15.4%-16.6%
pH: 3.5-4.6
Specific Gravity: 1.19-1.2
Substitutions of product of dissimilar nature are not permitted.
-1-
CONTRACT PURCHASING AGREEMENT
FOR THE PURCHASE OF
CATIONIC AND ANIONIC POLYMERS
THIS AGREEMENT is made this 8th day of June, 2022, by and between the City of South San
Francisco, California, hereinafter called the "CITY" and Polydyne Inc., 1 Chemical Plant Road,
Riceboro, Ga., 31323 hereinafter called the "SELLER", at South San Francisco, County of San Mateo,
State of California.
WHEREAS, THE City has determined a need for approximately 64,000 gallons annually of cationic
and anionic polymer emulsions used as a flocculation aid delivered in 275 gallon reusable totes.
WHEREAS, THE SELLER has the capability of delivering cationic and anionic polymer emulsion in
the amounts as required and in a timely manner.
NOW, THEREFORE, in consideration of the mutual promises and agreements hereinafter set forth, the
parties agree as follows:
1. Obligations: The CITY agrees to buy one hundred percent (100%) of the City’s annual volume
requirement from the SELLER. SELLER agrees to sell, and deliver approximately 64,000 gallons of
polymer emulsion to the CITY in accordance with SELLER’S schedule of delivery.
2. Shipping Terms:
(a)SELLER shall ship each shipment of PRODUCT FOB Delivered.
(b) All shipments of cationic and anionic polymers shall be accompanied with the
following:
i. Bill of Lading
ii. Certified Analysis indicating WE-984 Polymer, WE-527 Polymer and WE-2204
iii. Weighmaster’s certificate of weight
iv. Applicable regulatory documents
3.SELLER additionally agrees to comply with all provisions contained in City's specifications,
which include a requirement that insurance be obtained in the type and amount set forth in the
specifications and Section 14 below.
4.a) Purchase Price: The City agrees to pay to the SELLER, in accordance with the following:
Product: Ship to: Price Quantity Containers:
WE-984 South San Francisco $13.112/gal 4,000 gal 275 gal Totes
$1.49 lb
WE-527 South San Francisco $14.534/gal 30,000 gal 275 gal Totes
$1.69/lb
EXHIBIT C
CONTRACT PURCHASING AGREEMENT
Page 2
WE-2204 South San Francisco $14.534/gal 30,000 gal 275 gal Totes
$1.69/lb
NTE: The total compensation for products purchased under this Agreement shall not exceed
$924,488.00
5. Taxes: SELLER shall pay all applicable federal, state, and local taxes which may be chargeable
against the delivery of the PRODUCT listed herein.
6. Quantity: The quantity of PRODUCT received, and for which the CITY shall pay SELLER,
shall be measured in wet pounds by SELLER’S scales. Any clears of shortage shall be deemed waived
unless made in writing and received by SELLER within fifteen (15) days from CITY’S receipt of the
shipment in question. Shortages of less than 1% of the net weight of PRODUCTs shall not be
contested. The parties agree to exercise best efforts in good faith to resolve any discrepancies regarding
the weight of any shipment.
7. Purchase Orders: The CITY shall issue purchase orders to SELLER authorizing the
SELLER to provide the PRODUCTs in accordance with this agreement. SELLER will make its best
efforts to ship PRODUCT within five (5) business days days after receiving the CITY’S purchase
order.
8. Pricing: The prices herein specified are firm for 12 months following execution of this
agreement and includes all delivery costs. All prices are exclusive of tax and pesticide fee. All prices
are effective based upon the shipment date of the PRODUCT.
9. Payment: The price for the PRODUCT shall be invoiced in United States currency and will
be paid to the SELLER at the address indicated on the SELLER’S invoice. SELLER reserves the
right, among other available remedies, either to cancel this contract or suspend further deliveries under
this contract in the event the CITY fails to pay for any one shipment when payment becomes due and
upon written notice of such failure, the CITY does not pay the balance.
10. Quality: The SELLER agrees that the PRODUCT supplied pursuant to this Agreement shall be
free of sediment and solid particles and shall not contain anything that will adversely affect or interfere
with normal operation of the City’s biological treatment processes or be injurious to the ferric chloride
feeding equipment. SELLER further warrants that (A) all PRODUCT shall comply with the
Specifications and be of good merchantable quality, fit for the purpose for which sold, (B) SELLER
has good title to all PRODUCT delivered and all PRODUCT delivered are free from liens and other
encumberances, and (C) SELLER’s delivery and installation of the PRODUCT will be in strict
conformity with all applicable state, local and federal laws.
The CITY shall be obligated to purchase only that PRODUCT which meets the Specifications and
requirements listed above. Any claim that any PRODUCT does not meet Specifications or meet the
CONTRACT PURCHASING AGREEMENT
Page 3
CITY’s requirements shall be deemed waived unless made in writing and received by SELLER within
fifteen (15) days from the CITY’S receipt of the PRODUCT in question.
11. Non-Conforming PRODUCT: SELLER shall immediately replace all PRODUCT not meeting
Specifications, shall reimburse the CITY for the reasonable shipping costs associated with the CITY’S
return of non-conforming PRODUCT, shall pay for the shipping costs associated with delivering to the
CITY the replacement PRODUCT and shall be responsible for the disposal of any non-conforming
PRODUCT and associated containers returned by the CITY. If SELLER, after notice of non-
conformity, fails to proceed promptly to provide conforming product, the CITY may perform all work
necessary to effectuate such replacement and recover the cost from SELLER.
12. PRODUCT Testing: SELLER shall analyze and retain a clearly-marked, representative sample
from each shipment of PRODUCT. SELLER shall retain each sample and such sample's test results
for three (3) months and, upon written request, shall provide such to the CITY. The parties agree to
exercise best efforts in good faith to resolve any discrepancies between their respective test results
regarding any sample and/or shipment.
13. Indemnity: Except for any loss, damage or expense arising solely from the gross negligence or
willful misconduct of the CITY, or any employee, agent or independent contractor of the CITY
SELLER shall, to the fullest extent permitted by law, indemnify, defend and hold harmless the CITY
and its officers, employees, agents and independent contractors (“CITY INDEMNITEES”), from and
against any and all claims, loss, damage or expense, including reasonable attorney's fees, arising from
or relating to, or caused by the performance of SELLER under this Contract.
14. Insurance: Prior to beginning the Work and continuing throughout the term of this Agreement,
SELLER shall, at SELLER’S sole cost and expense, furnish the CITY with certificates of insurance
evidencing that SELLER has obtained and maintains insurance in the following amounts:
A. Workers’ Compensation that satisfies the minimum statutory limits.
B. Commercial General Liability and Property Damage Insurance in an amount not less than ONE
MILLION DOLLARS ($1,000,000) combined single limit per occurrence, TWO MILLION DOLLARS
($2,000,000) annual aggregate, for bodily injury, property damage, products, completed operations and
contractual liability coverage. The policy shall also include coverage for liability arising out of the use
and operation of any CITY-owned or CITY-furnished equipment used or operated by the SELLER, its
personnel, agents or subcontractors.
C. Comprehensive automobile insurance in an amount not less than ONE MILLION DOLLARS
($1,000,000) per occurrence for bodily injury and property damage including coverage for owned and non-
owned vehicles.
All insurance policies shall be written on an occurrence basis and shall name the CITY
INDEMNITIEES as additional insureds and any CITY insurance shall be secondary and in excess to
CONTRACT PURCHASING AGREEMENT
Page 4
SELLER’s insurance. If the SELLER’s insurance policy includes a self-insured retention that must be
paid by a named insured as a precondition of the insurer’s liability, or which has the effect of providing
that payments of the self-insured retention by others, including additional insureds or insurers do not
serve to satisfy the self-insured retention, such provisions must be modified by special endorsement so
as to not apply to the additional insured coverage required by this agreement so as to not prevent any
of the parties to this agreement from satisfying or paying the self-insured retention required to be paid
as a precondition to the insurer’s liability. Additionally, the certificates of insurance must note
whether the policy does or does not include any self-insured retention and also must disclose the
deductible.
The CITY Risk Manager, in writing, may approve a variation in the foregoing insurance requirements. A
valid and executed approval by Risk Manager must accompany this Purchase Agreement for a variation to
be binding.
15. Prevailing Wage: Where applicable, the wages to be paid for a day's work to all classes of laborers,
workmen, or mechanics on the work contemplated by this Purchase Agreement, shall be not less than the
prevailing rate for a day’s work in the same trade or occupation in the locality within the state where the
work hereby contemplates to be performed as determined by the Director of Industrial Relations pursuant
to the Director’s authority under Labor Code Section 1770, et seq. Each laborer, worker or mechanic
employed by SELLER or by any subcontractor shall receive the wages herein provided for. The SELLER
shall pay two hundred dollars ($200), or whatever amount may be set by Labor Code Section 1775, as may
be amended, per day penalty for each worker paid less than prevailing rate of per diem wages. The
difference between the prevailing rate of per diem wages and the wage paid to each worker shall be paid by
the SELLER to each worker.
An error on the part of an awarding body does not relieve the SELLER from responsibility for payment of
the prevailing rate of per diem wages and penalties pursuant to Labor Code Sections 1770-1775. The CITY
will not recognize any claim for additional compensation because of the payment by the SELLER for any
wage rate in excess of prevailing wage rate set forth. The possibility of wage increases is one of the
elements to be considered by the SELLER.
16. Damage To City Facilities: Damage to CITY or public facilities or private property
caused by the SELLER in the delivery of the PRODUCT shall be repaired and/or replaced in kind by
the SELLER at no cost to the CITY.
17. Force Majeure/Hardship/Other Sources: If the CITY’S ability to take or SELLER’S ability to
deliver the PRODUCT is impaired due to circumstances beyond reasonable control, including but not
limited to fire, flood, Government action, accident, labor disputes or shortage, or inability to obtain
from normal sources raw material, equipment, or transportation, the one so affected shall be excused
without liability from taking or making delivery to the extent of such impairment. If SELLER’S ability
to deliver PRODUCT is reduced due to any such circumstance, SELLER may reduce the contract
quantity in any year upon written notice to the CITY if SELLER deems such reduction necessary to
effect a fair allocation of the PRODUCT to users/purchasers thereof, in which case the CITY’S
CONTRACT PURCHASING AGREEMENT
Page 5
obligation to purchase PRODUCT from SELLER hereunder shall be reduced and adjusted
accordingly. Notwithstanding, if SELLER’S ability to deliver PRODUCT is reduced due to any such
circumstance, then the CITY may obtain PRODUCT from another source, and the quantity of
PRODUCT obtained from another source will be credited to any minimum quantity requirement set
forth in this Agreement for the respective contract year as if such had been purchased from SELLER.
If the CITY’S inability to take PRODUCT is excused under this subparagraph, SELLER’S obligation
to sell PRODUCT to the CITY hereunder shall be reduced and adjusted accordingly.
18. Site Safety and Cleanup: The delivery and installation site shall be kept clean and free of
hazards at all times during installation. After installation is completed at the site, SELLER shall clean
the surrounding area to the condition prior to installation.
19. Period and Renewal: This AGREEMENT is for the period beginning July 1, 2022 and ending
June 30, 2023. This AGREEMENT may be extended or amended by mutual agreement in writing
between the parties on the same terms and conditions through June 30, 2024 if such mutual agreement
is reached before expiration of the current agreement.
20. Notices: All notices concerning the subject matter hereof shall be made in writing and shall be
deemed to have been duly given (i) on the date of service if served personally on the party to whom
notice is to be given, (ii) on the date of service if delivery is made by overnight courier on the party to
whom notice is to be given at the address set forth above, or (iii) five (5) days after the date of
depositing the same in the U.S. mail and mailed to the Party to whom notice is to be given, by first
class mail, registered or certified, postage prepaid, and properly addressed as sat forth above. All
notices to be given with respect to this Agreement shall be addressed to:
To the City Contract Administrator:
Brian Schumacker, Plant Superintendent
Water Quality Control Plant
195 Belle Air Road,
South San Francisco, CA 94080
To Seller:
Polydyne, Inc.
1 Chemical Plant Road
Riceboro, GA, 31323
21. Entire Agreement: This contract, along with all exhibits attached hereto which are incorporated
herein by this reference, sets forth the entire and complete agreement regarding the subject matter
hereof and may be executed in identical counterparts.
22. Waivers: Waivers of a breach or default under this Agreement shall not constitute a
continuing waiver or a waiver of a subsequent breach of the same or any other provision of this
Agreement.
CONTRACT PURCHASING AGREEMENT
Page 6
23. Assignment: Neither party shall assign or delegate its rights or obligations under this contract
without the prior written consent of the other party, which consent shall not be unreasonably withheld.
Notwithstanding the foregoing, should substantially all of the assets of either party be purchased or
otherwise acquired by an unrelated entity or person, such party may assign and delegate its rights and
obligations hereunder to the acquiring person or entity.
24. Applicable Law: This Agreement shall be construed and enforced in accordance with the laws
of the State of California without reference to the conflict or choice of law principles thereof. The
jurisdiction for any litigation arising hereunder shall be in the state of California and venue shall be in
San Mateo County.
25. Modifications: No modification, waiver, termination, or amendment of this Agreement is
effective unless made in writing signed by the City and the SELLER.
26. Attorneys' Fees: If any action at law and equity shall be brought to recover for or on the
account of any breach of, or to enforce or interpret any of the covenants, terms or conditions of this
contract, the prevailing party shall be entitled to recover from the other party reasonable attorney's
fees.
27. Equivalent Pricing: SELLER assures the CITY that it will not offer lower prices to any
Municipal entity of comparable volume, shipping distances and like chemistry without adjusting same
for the CITY. Due to other existing contractual obligations, there may instances where another like
Municipality has a lower price but such contract will not be renewed or re-bid below The CITY’S
price, without making an adjustment to the CITY.
28. Severability: If any term of this Agreement is held invalid by a court of competent jurisdiction,
the remainder of this Agreement shall remain in effect.
CONTRACT PURCHASING AGREEMENT
Page 7
Exhibit A. (Attached): PRODUCT Specifications
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their
representatives as of this day first written above.
CITY OF SOUTH SAN FRANCISCO: SELLER:
A Municipal Corporation Polydyne Inc.
By: ___________________________ By: _______________________________
Title: Mike Futrell, City Manager Title: _____________________________
ATTEST:
________________________
City Clerk
Approved as to Form:
____________________________
City Attorney
CONTRACT PURCHASING AGREEMENT
Page 8
EXHIBIT “A” PRODUCT SPECIFICATIONS
The products selected for use at the South San Francisco - San Bruno Water Quality Control Plant
were selected based upon specific jar tests of several products. The products which provided the best
performance were:
WE-984
1. Polymer Type: Anionic Emulsion
2. Polymer Trade Name: WE-984
3. Percent of Total Solids: 48% - 55%
4. Minimum Percent of Active Solids: 41%
5. Molecular Weight: Very High
6. Bulk Density Range: 300-2000 cps*
7. UL Viscosity Range: 4.3-5.3
8. Specific Gravity: approximately 1.02
WE-527
1. Polymer Type: Cationic Emulsion
2. Polymer Trade Name: WE-527
3. Percent of Total Solids: 34% – 41%
4. Minimum Percent of Active Solids: 29%
5. Molecular Weight: Extremely High
6. Bulk Density Range: 500-2000 cps*
7. UL Viscosity Range: 7.5-9.3
8. Specific Gravity: approximately 1.02
* centipoise
Substitutions of product of dissimilar nature are not permitted.
MANUFACTURING SPECIFICATIONS
Total Solids TBD
Residual AcAm < 1000 ppm
Neat Viscosity 500 - 2000 cPs
UL Viscosity 4.3 - 5.3 cPs
HANDLING AND STORAGE
Suggested in-plant storage life is one year in unopened drums. For best
results, store at 50-80 F. Bulk tanks should be mixed by periodically
recirculating the contents bottom to top. Bulk tanks can also be fitted
with an agitator type mixer that reaches the bottom 2 feet of the tank.
Drums and bins should be mixed very well before first use and weekly
after that. Do not allow emulsion polymers to freeze. Should freezing
occur, allow the product to thaw thoroughly in a heated area and mix
well before attempting to use it. For spills of CLARIFLOC
WE-2204, sprinkle vermiculite or equivalent absorbant over the
spill area and sweep the material into approved chemical disposal
containers. Do not spray water onto a spill because the resulting
gel is very difficult to clean up.
SAFETY INFORMATION
CLARIFLOC WE-2204 is a mildly acidic product that can irritate
the skin and eyes and should be handled accordingly. Gloves, goggles
and apron are highly recommended. Anyone responsible for the
procure-ment, use or disposal of this product should familiarize
themselves with the appropriate safety and handling precautions
involved. Such information is outlined in the POLYDYNE Material
Safety Data Sheet. In the event of an emergency with this product,
contact Chemtrec anytime day or night at (800) 424-9300.
SHIPPING
CLARIFLOC WE-2204 polymer is shipped in 55 gallon
drums containing 450 pounds net or totes containing 2300
pounds net. Bulk quantities are also available.
PRINCIPAL USES
CLARIFLOC WE-2204 is a very high charge cationic
polyacrylamide in emulsion form that is used as a flocculant in a wide
variety of municipal wastewater treatment applications. It has been
successfully applied in all liquid/solids separation systems including
clarification, thickening, and dewatering.
TYPICAL PROPERTIES
Physical Form Clear to Milky White Liquid
Cationicity 60 %
Active Polyacrylamide Min. 35 %
Freezing Point 7o F (-14o C)
Density 8.5 - 8.7 lb/gal.
PREPARATION AND FEEDING
CLARIFLOC WE-2204 is a single component emulsion polymer
that must be pre-diluted in water before use. In most cases, this
product should not be applied neat. One method for dilution is
adding the neat polymer into the vortex of a mixed tank at a
concentration between 0.25-1.0%polymer (0.5% is optimum) by
weight. The polymer can also be injected through a number of
commercially available systems that provide in-line mechanical
mixing. The best feed systems use initial high energy mixing (>1000
rpm) for a short time (<30 sec) to achieve good dispersion followed by
low energy mixing (<400 rpm) for a longer time (10-30 min). Polymer
solutions should be aged for 15-60 minutes for best results. Solution
shelf life is 8-16 hours.
MATERIALS OF CONSTRUCTION
Cross-linked polyethylene, fiberglass, stainless steel or lined steel are
the preferred materials of construction for bulk tanks. Avoid natural
rubber and Buna-N gaskets as these materials swell when placed in
contact with neat polymer. Unlined mild steel, black iron, galvanized
steel, copper or brass are not recommended in any part of the feed
system. Stainless steel, Viton or Teflon are the best choices for pump
heads. For feed lines, use PVC or reinforced Tygon tubing.
CLARIFLOC WE-2204 POLYMER