CHANGE ORDER NO. 9 RE FORMER CLEARWATER MANUFACTURED GAS PLANT SITE
CITY OF CLEARWATER, FLORIDA
d/b/a CLEARWATER GAS SYSTEMS
and
ENVIRONMENTAL CONSULTING & TECHNOLOGY, INC.
CHANGE ORDER NO.9
EFFECTIVE DATE:
CLIENT: CITY OF CLEARWATER, FLORIDA
d/b/a! CLEARWATER GAS SYSTEMS
400 North Myrtle Avenue
Clearwater, Florida 34615
PROJECT: Former Clearwater Manufactured Gas Plant Site
The following changes are hereby made to the Professional Services Agreement
between the CITY OF CLEARWATER, FLORIDA, d/b/a CLEARWATER GAS
SYSTEM ("CGS") and ENVIRONMENTAL CONSULTING & TECHNOLOGY, INC.
("Consultant"), dated as of April 22, 1994 (the "Agreement"):
1. Article I - Term of Agreement is hereby amended to extend the term of the
Agreement for a period of one year from the date of this Change Order.
Personnel rates set forth in this Change Order shall remain in effect throughout
the extended term of this Agreement.
2. Article II - Scope of Work ("Work") is hereby amended to provide for the
implementation of all work described in the supplemental assessment work plan,
dated October 2002, attached hereto as Exhibit A and incorporated herein by
reference.
3. Article III - Compensation is hereby amended to provide that the maximum costs
for fees and reimbursable expenses for the services described in paragraph 2
above shall not exceed the sum of Sixty-Four Thousand Forty Two and 90/100
Dollars ($64,042.90). A breakdown of the maximum costs for various tasks of
the work described in paragraph 2 above is set forth in Exhibit B. In no event
shall such maximum costs be exceeded without authorization from CGS by
written approval of the appropriate Change Order. Any fees or
reimbursable expenses Consultant incurs in excess of said maximum costs
and without written approval of the appropriate Change Order by CGS shall
be entirely at Consultant's obligation and expense and CGS shall not be
liable for same.
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T:\COMMON\CGS\CO #9.doc--11/4/2002
4. Article V - Time for Completion is hereby amended to provide that the additional
work described in paragraph 2 and Exhibit A above shall be initiated within
30 days from the Effective Date of this Change Order and shall otherwise follow
the task completion date schedule set forth in Exhibit A.
5. Except as modified herein, all of the terms and provisions of the Agreement shall
remain in full force and effect.
APPROVALS REQUIRED:
ENVIRONMENTAL CONSULTING &
TECHNOLOGY, INC.
By: cLa~
Name: Charles D. Hendry. Ph.D.
Title: Vice President
Countersigned:
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SUPPLEMENTAL ASSESSMENT WORK PLAN
FORMER MANUFACTURED GAS PLANT SITE
CITY OF CLEARWATER
CLEARWATER, PINELLAS COUNTY, FLORIDA
PREPARED FOR:
CITY OF CLEARWATER
Clearwater, Florida
PREPARED BY:
~r:1
Environmental Consulting & Technology, Inc.
1408 North Westshore Boulevard
Suite 115
Tampa, Florida 33607
(813) 289-9338
Facsimile: (813) 289-9388
020895-0100
OCTOBER 2002
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
PROFESSIONAL CERTIFICATION
The technical contents of this supplemental assessment work plan for the City of
Clearwater have been prepared in accordance with currently accepted professional
practices. This report is for the sole use of the City of Clearwater and the Florida
Department of Environmental Protection.
Prepared by:
Sandra Tippin
Date
Reviewed by:
Mark A. Culbreth, P.G.
Senior Hydrologist
Florida License No. PG0001217
/4 /1) I~ 2-
11// /I1(f
Date
Environmental Consulting & Technology, Inc.
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
TABLE OF CONTENTS
PR 0 FESSI ON AL CERTIFI CA TI ON ............................................................................. I
1. SCO PE OF W 0 RK................................................................................................ 1-1
1.1 OBJECTIVE .................................. ................................................. ............... 1-1
1.2 M ONITO RIN G WELL INST ALLA TI ON .................................................. 1-1
1.3 SO IL SAMPLE CO LLECTI ON ................................................................... 1-3
1.4 GROUND WATER SAMPLE COLLECTION .......................................... 1-3
1.5 INVESTIGA TION DERIVED WASTE ...................................................... 1-4
1.6 Q U.ALITY ASSURANCE .......... .... .................................................... ............ 1-4
2. RES UL TS ......................... ................................ ........ ............. ........ .................... ..... 2-1
2 .1 REPORT ............................................................. .......................... .................. 2-1
2.2 INVESTIGA TION DERIVED WASTE ...................................................... 2-1
2.3 QUALITY ASSURANCE ..... .... .............................. .................. ...................... 2-1
2 .4 SCHEDULE........ .... ........... .... .... ... ..... .......... .................................. ................. 2-2
TABLES
FIGURES
..
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
LIST OF TABLES
Table 1.
Proposed Analytical Methods
LIST OF FIGURES
Figure 1.
Proposed Monitoring Well Location Map
Figure 2.
Proposed Monitoring Well Construction Details
Figure 3.
Proposed Deep Vertical Extent Well Construction Details
Figure 4.
Proposed Soil Sample Location Map
...
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
1. SCOPE OF WORK
1.1 OBJECTIVE
The objective of this supplemental assessment work plan is to outline the contamination
assessment activities discussed with the Florida Department of Environmental Protection
(FDEP) during the meeting between the City of Clearwater and the FDEP on September
25, 2002.
1.2 MONITORING WELL INST ALLA TION
Environmental Consulting & Technology, Inc. (ECT) will oversee the installation of four
surficial aquifer monitoring wells at the locations depicted on Figure 1. The well
locations include:
. west of the warehouse/purchasing building; .
. north of the city field engineering office;
. south of the city field engineering office; and
. southwest of the regulator building.
The surficial aquifer monitoring wells will be installed at the base of the surficial aquifer
using direct push technology by a licensed water well contractor, using a truck mounted
geoprobe rig. A stainless steel hand auger will be used to advance the first 4 ft.
Continuous soil samples will be collected to the total depth of the borehole using
macrocore sampling tubes. The monitoring wells will be constructed from 10ft of 1.5-
inch diameter, O.OIO-inch slotted, schedule 40 polyvinyl cWoride (PVC) screen, threaded to
a 5-ft length of schedule 40 PVC well casing. A 30/45 silica sand filter pack will be placed
in the borehole to approximately 1 ft above the top of well screen. A I-ft thick fine (30/65)
sand seal will be placed on top of the filter pack and the remainder of the borehole will be
filled with neat cement grout. The monitoring wells will be completed with a locking cap
inside of an 8-inch manhole protected with a 2 by 2-ft concrete pad. Figure 2 depicts the
proposed well construction details for the monitoring wells. The monitoring wells will be
developed following installation until the development water runs clear.
Environmental Consulting & Technology, Inc. 1-1
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
Three deep monitoring wells will be installed using rotosonic drilling to maximum depths
of 50 feet below land surface (ft bls) at the following locations:
. adjacent to monitoring well MW-I2D (MW-I2DV);
. adjacent to monitoring wells MW-7 and MW-7D (MW-7DV); and
. at a location to be determined following the installation of MW-7DV and
MW-I2DV and the determination of ground water flow direction in the aquifer
underlying the clay.
Figure 1 depicts the location of two of the proposed vertical extent monitoring wells.
Following the installation of MW-7DV and MW-I2DV, ECT will survey the top of
casing elevations of the wells to 0.01 ft vertical accuracy and the water level elevations
will be measured in all four of the DV wells. The final DV well will be installed at the
site boundary at a location that is determined to be downgradient of the source areas
identified in the CAR.
The vertical extent monitoring wells will be installed using 7-inch temporary isolation
casing installed to a depth of about 30 ft. Continuous soil samples will be collected to the
total depth of the borehole. The monitoring wells will be constructed from 5 ft of 2-inch
diameter, O.OIO-inch slotted, schedule 40 PVC screen, threaded to a 45-ft length of schedule
40 PVC well casing. A 30/45 silica sand filter pack will be placed in the borehole to
approximately 1 ft above the top of well screen. A 1- ft thick fine (30/65) sand seal will be
placed on top of the filter pack and the remainder of the borehole will be filled with neat
cement grout. The monitoring wells will be completed with a locking cap inside of an 8-
inch manhole protected with a 2 by 2-ft concrete pad. The monitoring wells will be
developed following installation until the development water runs clear. Figure 3 depicts
the proposed construction for the deep monitoring wells.
ECT will survey the horizontal and vertical coordinates of the newly installed monitoring
wells to the same benchmark as the existing network of monitoring wells.
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
1.3 SOIL SAMPLE COLLECTION
Continuous soil samples will be collected during the installation of the additional wells to
the total depth of the wells. The soil samples will be screened using an organic vapor
analyzer with a flame ionization detector (OV AlFID) at 1- ft intervals for the shallow
wells and at 2-ft intervals for the deep wells. The soil samples will be examined and
classified during collection by a geologist onsite to document the lithology encountered
during well installation.
ECT will collect vadose zone soil samples from 10 locations at the former gas plant site.
The locations of the proposed soil samples are indicated on Figure 4. At each of these
locations, a soil sample will be collected from 0 to 2 ft bls and from 3 to 5 ft bls (just
above the water table) for analyses for the presence of volatile organic aromatics (VOAs)
using U.S. Environmental Protection Agency (EPA) Method 8021, polynuclear aromatic
hydrocarbons (PAHs) using EPA Method 8310 and cyanide using EPA Method 9010.
Table 1 is a summary of proposed analytical methods.
ECT will collect vadose zone soil samples from two locations in the footprint of the
storm water pond to be constructed on the adjacent property east of Myrtle Avenue and
north of Hart Street. The locations of these soil samples are indicated on Figure 4. At
each of the two soil sample locations, soil samples will be collected from depths of 0 to 2
ft bls and 3 to 5 ft bls for analyses for the presence of VOAs using EP A Method 8021,
P AHs using EP A Method 8310 and cyanide using EP A Method 9010.
Soil samples will be collected in accordance with the FDEP SOPs. Table 1 lists the
analytical parameters.
1.4 GROUND WATER SAMPLE COLLECTION
ECT will collect a complete round of water level measurements at all monitoring wells
prior to the collection of ground water samples.
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
A minimum of 24 hours following monitoring well development, ECT will collect
ground water samples from the newly installed monitoring wells and monitoring wells
MW-15DV and MW-llDV in accordance with the FDEP Standard Operating Procedures
(SOPs). The ground water samples will be analyzed for the presence of VOAs using
EP A Method 8021, P AHs using EP A Method 8310 and cyanide using EP A Method
901 o. Field parameters including temperature, pH, conductivity, dissolved oxygen,
oxidation reduction potential and turbidity will be measured and recorded during sample
collection. Table 1 is a summary of proposed analytical methods.
1.5 INVESTIGA TlON DERIVED WASTE
All investigation derived waste. including soil cuttings, drill cuttings, development and
purge water will be containerized using 55-gallon drums for disposal.
1.6 QUALITY ASSURANCE
All soil and ground water sample collection will be completed in accordance with FDEP
SOPs.
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
2. RESULTS
2.1 REPORT
ECT will prepare a report which includes the results of the additional investigations. The
report will include figures and tables for the site including:
. monitoring well construction details table;
. water table elevation summary;
. summary of organic vapor readings table;
. summary of soil analytical results table;
. summary of ground water analytical results table;
. updated site figures depicting all monitoring well locations;
. water table contour map;
. potentiometric surface map; and
. dissolved constituents map.
ECT will include copIes of all water sampling logs, well construction details and
analytical data reports in its report.
The report will also include a discussion of the data for monitoring wells MW -10 and
MW-IOD which are located on the Health Department Property and will evaluate the data
with respect to petroleum versus coal gasification impacts. The report will include an
evaluation of the data with respect to applicable soil and ground water cleanup target
levels.
2.2 INVESTIGA TION DERIVED WASTE
Documentation of disposal of investigation derived waste will be provided.
2.3 QUALITY ASSURANCE
All soil and ground water sample laboratory analytical reports will be reviewed to
evaluate the acceptability of the data for this project's data quality objectives.
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City of Clearwater
Former Manufactured Gas Plant Site
Supplemental Assessment
Work Plan
2.4 SCHEDULE
A report describing the results of the proposed field work will be submitted to FDEP
within 12 weeks from initiation of field work.
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TABLES
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Table 1, Summary of Analytical Methods
Former Clearwater Manufactured Gas Plant
Clearwater, Florida
Parameter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
: v.CJj~#ifi: :6.t.~~ni.~: At~m~#~~: i.~p.A.: M~tM~: ~1)~1j::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Benzene
Ethylbenzene
Toluene
Total Xylenes
. . ........ ......... ............. ......... -............ ...............-.......
......... .... ,...............-..".. ... ........-... ... ...
:F!ijjii;~~/~~(A.~~~ti.~:#y'd~~r~~ri~:i~A.:M~/{~:~3.t6i::::::::::::::::::::::::::::::::::::.
Acenaphthene
Acenaphthylene
Anthracene
Benzo( a )anthracene
Benzo(b )f1uoranthene
Benzo( k )f1uoranthene
Benzo( a)pyrene
Benzo(g,h,i)perylene
Chrysene
Dibenzo( a, h )anthracene
Fluoranthene
Fluorene
Ideno(1,2,3-c,d)pyrene
Naphthalene
Phenanthrene
Pyrene
1-Methylnaphthalene
2-Methylnaphthalene
........... .
... -................. '... ............
.~~""ra' :c.heif,;~:t'y: (~A :~~~ :~3~;~: iJi,iJ:9()10)::::::::::::::
Cyanide, Total
. .
.......... -.
Printed On: 10/14/2002
T:\COMMON\City of Clearwater\GasPlant\Analytical
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PROPOSED SURFICIAL AQUIFER
MONITORING WELL CONSTRUCTION DETAILS
CROSS-SECTIONAL
VIEW
PROTECTIVE CASING AND CONCRETE PAD
GROUND LEVEL
30/65 FINE SAND
1 FOOT
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CASING MATERIAL
CASING DIAMETER
PAD DIMENSIONS
STEEL
8 INCHES
2' X 2'
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SECURE WELL CAP
WELL CASING
MATERIAL
DIAMETER
JOINT TYPE
LENGTH
SCH 40 PVC
1.5 INCHES
THREADED
5 FEET
BACKFILL AROUND CASING
MATERIAL
THICKNESS
NEAT CEMENT GROUT
3 FEET
SEAL
TYPE OF SEAL
THICKNESS
FILTER PACK
TYPE OF FILTER
DISTANCE ABOVE SCREEN
WELL SCREEN
SCREEN MATERIAL
DIAMETER
LENGTH
SLOT SIZE
30/45 SILICA SAND
1 FOOT
SCH 40 PVC
1.5 INCHES
10 FEET
0.010 INCHES
/-
DEPTH TO BOTTOM OF
MONITORING WELL
- DIAMETER OF BOREHOLE
1 5 FEET
-r-
4 INCHES
NOT TO SCALE
FIGURE 2.
PROPOSED SURFICIAL AQUIFER MONITORING WELL ~ ".1....
CONSTRUCTION SCHEMATIC ... ..,
CITY OF CLEARWATER, FORMER MANUFACTURED GAS PLANT SITE
CLEARWATER, FLORIDA Environmental Consulting &: Technology, Inc.
Source: ECT, 2002.
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Sep 15, 2002 - 8:47am by jvonborstE
PROPOSED DOUBLE CASED VERTICAL EXTENT
MONITORING WELL CONSTRUCTION DETAILS
GROUND LEVEL
CROSS-SECTIONAL
VIEW
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CASING MATERIAL
CASING DIAMETER
PAD DIMENSIONS
SECURE WELL CAP
TEMPORARY PROTECTIVE CASING
DIAMETER
BACKFILL
LENGTH
WELL CASING
MATERIAL
DIAMETER
JOINT lYPE
LENGTH
BACKFILL AROUND CASING
MATERIAL
THICKNESS
SEAL
lYPE OF SEAL
THICKNESS
FILTER PACK
lYPE OF FILTER
DISTANCE ABOVE SCREEN
WELL SCREEN
SCREEN MATERIAL
DIAMETER
LENGTH
SLOT SIZE
DEPTH TO BOTTOM OF
MONITORING WELL
- DIAMETER OF BOREHOLE
FIGURE 3.
PROPOSED DOUBLE CASED VERTICAL EXTENT
MONITORING WELL CONSTRUCTION SCHEMATIC
CITY OF CLEARWATER, FORMER MANUFACTURED GAS PLANT SITE
CLEARWATER, FLORIDA
Source: ECT, 2002.
STEEL
8 INCHES
2' X 2'
7 INCHES
NEAT CEMENT GROUT
30 FEET
SCH 40 PVC
2 INCHES
THREADED
45 FEET
NEAT CEMENT GROUT
43 FEET
FINE SAND
1 FOOT
30/45 SILICA SAND
1 FOOT
SCH 40 PVC
2 INCHES
5 FEET
0.010 INCHES
SO FEET
8 INCHES
NOT TO SCALE
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PROPOSED SOIL SAMPLE LOCATION
FIGURE 4.
PROPOSED SOIL SAMPLE LOCATION MAP
FORMER CLEARWATER MANUFACTURED GAS PLANT SITE
CLEARWATER, FLORIDA
Ee,
Environmental Consulting & Technology, Inc.
Source: ECT, 2002.
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Proposed Budget
Clearwater Gas System
Supplemental Assessment Work Plan
Task Labor Equipment EXDenses Subcontractors Subtotal
Meeting 1,630.86 0.00 79.36 0.00 $1,710.22
Monitor Well Installation 2,698.08 150.00 152.92 2,215.40 $5,216.40
Soil Sample Collection 2,670.36 150.00 152.01 5,220.00 $8,192.37
Ground water sample collection 4,474.47 509.20 275.15 2,310.00 $7,568.82
Deep Well Installation 4,640.79 0.00 336.19 22,841.50 $27,818.48
Off site soil sample collection 1 ,265.88 150.00 103.70 1,034.00 $2,553.58
Top of casing survey 1,392.93 150,00 106.93 0.00 $1,649.86
Report 9,032.10 0.00 301.07 0.00 $9,333.17
Subtotal $27,805.47 $1,109.20 $1,507.33 $33,620.90 $64,042.90
Printed On: 10/25/2002
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