1994-109E:\WPDOCS\ORD\BAKER.AMD
ORDINANCE NO. q1'/Q?
AN ORDINANCE AUTHORIZING THE MAYOR TO EXECUTE AMENDMENT NO. 1 TO
THE AGREEMENT BETWEEN THE CITY OF DENTON AND BAKER-SHIFLETT/EMCON
RELATING TO PROFESSIONAL ENGINEERING SERVICES FOR EXPANSION OF THE
LANDFILL; AUTHORIZING THE EXPENDITURE OF FUNDS THEREFORE; AND
PROVIDING AN EFFECTIVE DATE.
THE COUNCIL OF THE CITY OF DENTON HEREBY ORDAINS:
SECTION I. That the Mayor is authorized to execute an
amendment to the agreement between the City of Denton and Baker-
Shiflett/Emcon relating to geotechnical professional engineering
services for the expansion of the landfill under the terms and
conditions contained within said amendment, a copy of which is
attached hereto and made a part hereof.
SECTION IT. That the City Council hereby authorizes the
expenditure of funds not to exceed One Hundred Seventy-Seven
Thousand Two Hundred Thirty Seven ($177,237) Dollars for the
services required pursuant to the Agreement.
SECTION III. That this ordinance shall become effective
immediately upon its passage and approval.
PASSED AND APPROVED this the day of , 1994.
BOB CASTLEBERRY,
BY:
APPROVED AS TO LEGAL FORM:
DEBRA A. DRAYOVITCH, CITY ATTORNEY
BY:
~c
ATTEST:
JENNIFER WALTERS, CITY SECRETARY
AMENDMENT NO. 1
TO THE
AGREEMENT BETWEEN THE CITY OF DENTON, TEXAS
AND BARER-SHIFLETT/EMCON, INC.
THIS AGREEMENT is made and entered by and between the City of
Denton, Texas, a municipal corporation situated in Denton County,
Texas, hereinafter called the "City", acting herein by and through
Lloyd Harrell, its duly authorized City Manager, and Baker-
Shiflett/Emcon, Inc., an independent contractor, acting herein by
Michael M. Shiflett and through its duly authorized President
hereinafter called the "Engineer".
W I T N E S E T H
That for and in consideration of the mutual covenants and
agreements herein contained, the parties hereto do hereby covenant
and agree to amend the agreement dated March 1, 1994 for
geotechnical services for the landfill expansion as follows:
1. SECTION I - SERVICES OF THE ENGINEER:
The addition of the following language to the end of Section
I:
Hydrogeological analysis and consolidation tests as set
forth in Attachment B.
2. SECTION II - CHARACTER AND EXTENT OF ENGINEER'S SERVICES:
The addition of the following language to the end of Section
II:
Engineer shall perform additional scope of services as set
forth in Attachment B attached to this document.
3. SECTION V - COMPENSATION TO ENGINEER:
The first paragraph is amended to read as follows:
The total compensation for all of the assignments to be per-
formed by Engineer as described in Section II - CHARACTER AND
EXTENT OF ENGINEER'S SERVICES hereof shall not exceed
$177,237.
All other provisions, terms, conditions and obligations of the
Agreement between CITY and ENGINEER which are not expressly amended
herein shall remain in full force and effect. Said Agreement and
this Amendment shall be construed together as a single contractual
agreement.
IN WSTI14ONY HE F, the parties have executed the Agreement, this
p_ day of 1994.
61
This Agreement is executed in four (4) counterparts.
CITY OF DENTON, TEXAS
BOB CASTLEBERRY, MAYOR
ATTEST:
JENNIFER WALTERS, CITY SECRETARY
BY : gin 11 I'L/I 1 wu
AP ED TO LEGAL FORM:
DEBRA A. DRAYOVITCH, CITY ATTORNEY
BY:
BAKER-SHIFLETT/EMCON, INC.
MICHAEL M. SHIFL T, PRESIDENT
ATTEST:
BY : ff l" tit ~ O J
E:\WPDOCS\K\HAKER.AMD
PAGE 2
~x 1
ATTACHMENT NO.
SCOPE OF SERVICES
HYDROGEOLOGICAL, GEOLOGICAL, AND
GEOTECHNICAL STUDY
ATTACHMENTS 4 AND 5
Prepared for
Citv of Denton
June 1994
Prepared by
EMCON Baker-Shiflett. Inc.
Eneineerine and Environmental Services
Fort Worth. Texas
Proposal 940-94-05-01
SCOPE OF SERVICES
Task 1 Site Geology
A geologic study utilizing the existing site subsurface data will be conducted for use as
the geology sections of Attachment 4. This study will include identification of geologic
and stratigraphic units at the site. The geologic age. lithology, thickness. depth.
geometry, hydraulic conductivity and other appropriate analysis will be provided using
geologic maps and cross-sections as well as boring logs.
Task 2 Additional Laboratory Testing
HDR has requested that EBS conduct site specific laboratory tests including triaxial
strength and consolidation tests, so that HDR can perform landfill side slope analysis and
landfill floor settlement/heave analysis.
PROPOSED SUPPLEMENTAL LABORATORY TESTING
FOR DENTON LANDFILL EXPANSION
Test
Quantity
Rate
Total
Triazial Compression/Consolidated
Undrained with Pore Pressure
Measurement
3
855.00
2,565.00
Direct Shear
2
555.00
1,110.00
Consolidation
2
195.00
390.00
Specific Gravity
7
45.00
315.00
Atterberg Limits
7
40.00
280.00
Percent passing No. 200
4
25.00
100.00
Sieve Analysis
2
45.00
90.00
Hydrometer
2
75.00
150.00 11
TOTAL TESTING $5,000.00
FW/320/DENAT74&5 P.606-94/P1o:4 Rev. 0. 06/09/94
940-94-05-015 1
Task 3 Site Hydrogeoiogy Studv
A hydrogeologic study of the site siil 'r., -,rrnrmed '-asea ~n the .:ata :-,om .field
exploration, laboratory testing. aquiver testing. -na .cater-!ecel measurements in the site
piezometers. Water level reading events wiiI be scheduled for the ptezometers to provide
data over a period of seasonal change. As a cost-sa%mgs measure. '.ce propose to utilize
the city of Denton 's on-site personnel to perform ceelc.cater iecei readings.
Precipitati^n data will be collected from the nearest weather station, and hydrographs
comparing precipitation and groundwater levels will be .7repared. Groundwater contours
within the depths of piezometer installations (if any) will be developed for each
groundwater zone encountered to demonstrate any seasonal change.
Aquifer characteristics of the groundwater zones at the site will be determined by
conducting a pump test and interpreting the rest information. The purpose of this test is
to determine hydraulic conductivity of the aquifer and to determine if the individual zones
are hydraulically connected. Direction and rate of groundwater flow will be interpreted
from the water-level data, potentiometric surface maps and the pump test data.
Evaluation of likely contaminant flow pathways will be evaluated by the use of seasonal
potentiometric surface maps and by constructing hydrogeologic cross-sections. Based on
this analysis and appropriate groundwater monitoring system will be designed in
accordance with Subtitle D and TNRCC requirements.
Task 4 Geology, Hydrogeological, and Geotechnical Report
A report containing the geological, hydrogeology, and geotechnical data, analysis and
interpretation will be prepared and formatted as Attachments 4 and 5 for the permit
application.
Data and conclusions regarding geological, hydrogeology, and geotechnical aspects of
the site characterization will be provided as completed to HDR. Permit documents
(Attachments 4 and 5) will be completed and submitted to HDR for their inclusion into
the permit application.
ADDITIONAL SERVICES
• This assumes geologic, geotechnical, and hydrogeological analysis of the
proposed site. It does not include interpretation or analysis of data associated
with the existing landfill.
• Response to TNRCC comments will be charged as additional services.
• Analysis of additional groundwater zones if required.
FW/320/DENATT4&5-P.606-94/pjo:4 Rev. 0, 06/09/94
940-94-05-015
SCHEDULE
It is anticipated that the .Attachments -:.loci : ranon ill he xmniered ~%tinin :20 davs
Prom date of the notice to proceed. H~uro_raphs id rc updated one r'inai time prior to
submittal of the permit application the T\RCC. The date •~t ihat :odaie %ill be
agreed upon by EMCON Baker-Shirlett. inc. EBS ind HDR.
ESTIMATED COSTS
Task 1 Geology Study
Task Geotechnical Testing
Task 3 Hydrogeology Study
Task 4 Report - .-Attachments 4 and
Contingency - 15%
TOTAL ESTIMATED COSTS
14-000
.000
'3.000
;1.000
8.700
S 66.700
FW/3201DENATT4&5-P.606.941pjo:4 Rev. 0. 06/09/94
940-94-0"1 5 3
ATTACHMENT NO.
SCOPE OF SERVICES
HYDRO GEDLOGICAL, GEOLOGICAL, AND
GEOTECHNICAL STUDY
ATTACHMENTS 4 AND 5
Prepared for
City of Denton
June 1994
Prepared by
EMCON Baker-Shiflett, Inc.
Engineering and Environmental Services
Fort Worth. Texas
Proposal 940-94-05-01
SCOPE OF SERVICES
Task 1 Site Geology
A geologic study utilizing the existing site subsurface data will be conducted for use as
the geology sections of Attachment 4. This study will include identification of geologic
and stratigraphic units at the site. The geologic age. lithology, thickness, depth,
geometry, hydraulic conductivity and other appropriate analysis will be provided using
geologic maps and cross-sections as well as boring logs.
Task 2 Additional Laboratory Testing
HDR has requested that EBS conduct site specific laboratory tests including triaxial
strength and consolidation tests, so that HDR can perform landfill side slope analysis and
landfill floor settlement/heave analysis.
PROPOSED SUPPLEMENTAL LABORATORY TESTING
FOR DENTON LANDFILL EXPANSION
Test
Quantity
Rate
Total
Triaxial Compression/Consolidated
Undrained with Pore Pressure
Measurement
3
855.00
2,565.00
Direct Shear
2
555.00
1,110.00
Consolidation
2
195.00
390.00
Specific Gravity
7
45.00
315.00
Atterberg Limits
7
40.00
280.00
Percent passing No. 200
4
25.00
100.00
Sieve Analysis
2
45.00
90,00
Hydrometer
2
75.00
150.00
TOTAL TESTING $5,000.00
FW/320/DENATT4&5-P.606-94/pj0:4 Rev. 0, 06109/94
940-94-05-015 1
Task 3 Site Hydrogeoiogy Study
A hydrogeologic study of the site will be performed based on the data from field
exploration, laboratory testing, aquifer testing. and water-level measurements in the site
piezometers. Water level reading events will be scheduled for the piezometers to provide
data over a period of seasonal change. As a cost-savings measure. we propose to utilize
the city of Denton's on-site personnel to perform weekly water level readings.
Precipitation data will be collected from the nearest weather station, and hydrographs
comparing precipitation and groundwater levels will be prepared. Groundwater contours
within the depths of piezometer installations (if any) will be developed for each
groundwater zone encountered to demonstrate any seasonal change.
Aquifer characteristics of the groundwater zones at the site will be determined by
conducting a pump test and interpreting the test information. The purpose of this test is
to determine hydraulic conductivity of the aquifer and to determine if the individual zones
are hydraulically connected. Direction and rate of groundwater flow will be interpreted
from the water-level data, potentiometric surface maps and the pump test data.
Evaluation of likely contaminant flow pathways will be evaluated by the use of seasonal
potentiometric surface maps and by constructing hydrogeologic cross-sections. Based on
this analysis and appropriate groundwater monitoring system will be designed in
accordance with Subtitle D and TNRCC requirements.
Task 4 Geology, Hydrogeological, and Geotechnical Report
A report containing the geological, hydrogeology, and geotechnical data, analysis and
interpretation will be prepared and formatted as Attachments 4 and 5 for the permit
application.
Data and conclusions regarding geological, hydrogeology, and geotechnical aspects of
the site characterization will be provided as completed to HDR. Permit documents
(Attachments 4 and 5) will be completed and submitted to HDR for their inclusion into
the permit application.
ADDITIONAL SERVICES
• This assumes geologic, geotechnical, and hydrogeological analysis of the
proposed site, It does not include interpretation or analysis of data associated
with the existing landfill.
• Response to TNRCC comments will be charged as additional services.
• Analysis of additional groundwater zones if required.
FW/3201DENATr4&5-P-606-941pjo:4 Rev. 0, 06/09194
940-94-05-015 2
SCHEDULE
It is anticipated that the Attachments 4 and 5 report will be completed within 120 days
from date of the notice to proceed. Hydrographs will be updated one final time prior to
submittal of the permit application to the TNRCC. The date of that update %vill be
agreed upon by EMCON Baker-Shiflett. Inc. tEBS and HDR.
ESTIMATED COSTS
Task 1 Geology Study 14,000
Task 2 Geotechnical Testing 5.000
Task 3 Hydrogeology Study 28.000
Task 4 Report - attachments 4 and 5 11.000
Contingency - 15% 8,700
TOTAL ESTIMATED COSTS S 66.700
FW/320/DENATr4&5-P.606-94/pj0:4 Rev. 0. 06/09/94
940-9"5-015 3