gal

FINAL

RMA OFF-POST WELL ABANDONMENT

CONSTRUCTION COMPLETION REPORT

Prepared for:

Rocky Mountain Arsenal Remediation Venture Office

Department of the Army

Shell Oil Company

U.S. Fish and Wildlife Service

Prepared by:

LATA/AG&M Team

ROCKY MOUNTAIN ARSENAL

July 9, 1999

Lq 

5193-1/1-D

ARCADIS GERAGHTY&MILLER

00016124
THE LATAIARCADIS GERAGHTY & MILLER TEAM

CONTENTS

Section

Page

A c ro n y m s .. .. .. .. ................. ..... ...................................................... .... ............. ...... v

List of Figures and Tables ..................................................................................................... vi

E x ecu tiv e S u m m ary ............................................. ...................................................................... I

1.0 In tro d u ctio n . ... . .................................................................................................. 2

1. 1 S ite H isto ry ... ............. .......................................................................... 2

1.2 Description of Remedy ............. .......... ............................... ........................ 2

2.0 Chronology of Events . . ...... .. . .................. ......................................................... ... 4

2.1 Pump Removal and Video Logging ........... .. . . ................................ .............. 5

2.2 M onitoring W ell Closure (37304 and 37319) ...... .............. .................................. ..... 5

2.3 Domestic W ell Closures .................................. .... .................................................... 5

2 .3 .1 W ell 2 9 9 A ....... ......................................................................................... 6

2.3.1 1 Site Preparation . ........... . ....................................... ........ 6

2.3 1 2 Perforation ......... . .. ............. .... . ........................................ ...... 6

2 3 1 3 G ro u ting .. ... ................. .. .. ... ................................................... .. 6

2 3 1 4 Decontamination ............. .. ...... ........... .... .. . . ........... 6

2.3 1 5 Surface Closure and Site Repairs ................. .. . ............ 8

2 .3 .2 W ell 9 8 5 A .. ............................. .. .. ..................................... ................ .8

2.3.2 1 Site Preparation ... ..... ............ ..... ........................................ ....... 8

2.3 2 2 Perforation ...... .... ...... .... .. ... ................................................ 8

2.3 2.3 Grouting .. .......... .. ....... ..... ......................................... .... 8

2 3 2.4 Decontamination ..... . ...... . .. ............. .. 8

2.3 2 5 Surface Closure and Site Repairs . .......................... ... 8

2 .3 .3 W ell 3 9 5 A .. ............... .................. ........................ ........... ....... ...... 8

2 3 3 1 Site Preparation . ... . .. . .. ....... .. ........ .... ...... ............. .... 8

2 3 3 2 Perforation . ........ ....... I .. . .... .. .......................... .............. .. 8

2 .3 3 .3 G ro u ting ....... ..... .... ....... .... .... ................................. ......... ..... 8

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2.3.3.4 Decontamination .......... ...... 9

2.3.3.5 Surface Closure and Site Repairs ... ......... ............................................ 9

2 .3 .4 W ell 9 14 A .......... ... . ............... . .. .... .. ............................ ..................... 9

2.3 4.1 Site Preparation .... .. . ...... ........ .. .... ....... ............................. 9

2.3.4.2 Perforation ... . ............................ .. ......................... ..................... 9

2 .3 4 3 G ro utin g ........................... ........ ..................................................... 9

2.3.4.4 Decontamination ................ :", * ....... 9

2.3.4 5 Surface Closure and Site Repairs . .. .......... ................. I ............... 9

2.3.5 W ell 1070A ........... ............................................................................... 10

2.3.5.1 Site Preparation. ................... .. . ........................................... 10

2.3.5.2 Perforation . ............. ..................................... .......................... 10

2 .3 .5 .3 G ro uting ..... ...... ........... .. ..... ........................................................ 10

2.3.5.4 Decontamination .. .... . . ................... .... .............. ............ ............ 10

2.3.5.5 Surface Closure and Site Repairs ................ ....................................... 10

2.4 Replacement W ell Construction ..... ............................. ............................................. 10

2 .4 .1 W e ll 9 14 B .......................... ... .................................................................. I I

2 4 1 1 Drilling M ethod . . .. .......................... . ........................................ 11

2.4.1.2 W ell Construction . .................... ..................................................... I I

2.4.1.3 W ell Development ................. .. ............................. .................... 11

2.4.1.4 Pump, Piping, and Connections . ........... .......... .. .................. 12

2 4.2 W ell 1070B .. ..... .. .................................................. .. ........ . .... 12

2 4 2 1 Drilling M ethod .. ............... .. .. .......................................... . .. 12

2.4 2 2 W ell Construction . . ......... . ................................................ 12

2.4.2.3 W ell Development ............. . . ............................................... .. 12

2 4.2.4 Pump, Piping, and Connections .. ....... .. ........... .... .... ... ........ 12

3.0 Performance Standards and Clean-Up Goals ... .......... . ........... ........................ 12

4 0 Quality Assurance/Quality Control . . ... .. . ....... ....... .................. ............. .. 13

4.1 Review and Oversight .... ............ ................ ......... .... ............ ............ .......... 13

4 2 Video Logging Depth M easurements .............. ...... . ...... .. .... ..... ............ 13

4.3 Grout Volumes .. . ..... ............. ............. .. .......... . ........ ..... . . ........ 14

4.4 W ell Depths ......... ............. ........................... ....................................... 14

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4.5 Documentation ......... ....... ................................................................... .14

5.0 Description and Rationale for Project M odifications .... ............................................ 15

M odification I . .. .. .. ...................... ............... ............... ........... ... 15

M odification 2 .. ............. ..................................................................... 15

6.0 Construction Quality Assurance Documentation Summ ary ... .......................................... 15

7.0 Final Inspection Documentation ........ .......... ................................................................... 15

8.0 Operation and M aintenance Requirem ents ....... .................... ............................................ 16

9.0 Summary of Costs ...... .............. .......................................................................... 16

10.0 Certification .... ......... ........... ........................ .................................................. 16

11.0 Supporting Documents.. .. ....... ....................... ...................................................... 16

Appendix A-W ell Closure Forms . .. ............................................. .................................. .. A- I

Appendix B-Final Inspection Attendance List ... . ......... . ................................................... B-1

Appendix C - Photographs .... .. ................................................................................. C-1

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THE LATAIARCADIS GERAGHTY & MILER TEAM

ACRONYMS AND ABBREVIATIONS

CERCLA Comprehensive Environmental Response, Compensation and Liabilities Act

CCR Construction Completion Report

CDPHE Colorado Department of Public Health and Environment

CPG Certified Professional Geologist

DIMP Diisopropyl Methylphosphonate

DOL Department of Labor

HASP Health and Safety Plan

LATA Los Alamos Technical Associates

Mod I First Modification

Mod 2 Second Modification

QA/QC Quality Assurance/Quality Control

QAPP Quality Assurance Project Plan

RDIS Remedial Design and Implementation Schedule

RMA Rocky Mountain Arsenal

ROD Record of Decision

RPD Relative Percent Difference

RVO Remediation Venture Office

sow Statement of Work

TCHD Tri-County Health Department

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THE LATAIARCADIS GERAGHTY & MUER TEAM

LIST OF FIGURES AND TABLES

Tables

Page

Table I Chronology of Scheduled and Actual Project Milestones .... ....... ................ ........ .4

Table 2 Sum m ary of Abandonm ent M ethods ... ................................ .................................. 7

Table 3 Construction Details for Replacement Wells .......................... ............................ .. I I

Table 4 Precision of Video Logging Depth Measurements .................................................. 14

T able 5 Project C ost Sum m ary ................................................................................. 16

Fi2ures

Page

Figure I O ff-Post W ell Location M ap .. .............................................................. 3

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THE LATAIARCADIS GERAGHTY & MILLER 7FAM

Executive Summary

This Construction Completion Report (CCR) has been prepared in accordance with the Record of

Decision (ROD) as appended in the Remedial Design and Implementation Schedule (RDIS) of

December 9, 1996 The purpose of the CCR is to document the completion of each implementation

project under the On-Post Operable Unit ROD and, in this case, these standards have been adopted to

document completion of an implementation project for the Off-Post Operable Unit.

This project involved closure of seven (7) off-post, domestic water supply and monitoring wells to

prevent downward migration of contaminants from the alluvial aquifer to the Arapahoe Aquifer. Five of

the wells were domestic water supply wells that were closed per requirements of the ROD. These wells

were closed by perforating or removing the casing, followed by pressure-grouting the entire interval of

the well. The remaining two wells were monitoring wells not covered under the ROD, but closed under

this work scope because they were no longer being used for groundwater monitoring. These wells were

closed by backfilling with a mixture of Portland cement, bentonite, and water. Following well closure,

two replacement wells were constructed in a manner that prevents downward migration of contaminants

Because the domestic water-supply wells were on private land, pre-construction conditions were

photographically documented, and care was taken to repair any damage and return work sites to their

original condition.

The contract for this effort was awarded to Los Alamos Technical Associates (LATA) on July 21, 1998,

closure of wells and construction of new wells was completed by November 30, 1998, and all field

activities were completed on December 4, 1998. A Final Inspection was conducted on December 16,

and at this time satisfactory completion of all activities in the statement of work was verified. In

attendance were representatives from the Environmental Protection Agency (EPA), the Tri-County

Health Department (TCHD), the Colorado Department of Public Health and Environment (CDPHE),

and the RMA Remediation Venture Office (RVO)

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THE LATAIARCADIS GERAGHTY & MILLER TEAM

1.0 Introduction

Under the Record of Decision (ROD) for the Off-Post Operable Unit at Rocky Mountain Arsenal

(RMA), criteria were set for abandonment of wells in the Off-Post Study Area. The scope of this effort

was abandonment of seven off-post wells, and their locations are shown in Figure 1. Five of the wells

were domestic water supply wells that were closed per requirements of the ROD These wells were

completed in the confined aquifer, and sampling results showed concentrations of diisopropyl

methylphosphonate (DIMP) above the remediation goal of 8 ýtg/L. Closure of these wells was needed to

prevent continued migration of contaminants from the alluvial system to the underlying confined aquifer

through the well bore. These five wells were closed through mechanical perforation and, in one case,

overdrilling, followed by pressure grouting.

The other two wells were 2-inch diameter PVC monitoring wells that were not covered under the ROD,

but were abandoned by plugging/backfilling with grout under this work scope because they are no

longer being used for groundwater monitoring. One of these wells was completed in the confined

aquifer and the other in the Unconfined Flow System (UFS). The UFS consists of groundwater flowing

through alluvial materials and underlying weathered bedrock, and in the off-post study area typically

consists of primarily alluvial groundwater. Therefore, the UFS in the off-post study area will be referred

to as the alluvial aquifer in the remainder of this document.

1.1 Site History

RMA occupies more than 17,000 acres (approximately 27 square miles) in Adams County,

approximately 8 miles northeast of Denver, CO The property was purchased by the United States

Government in 1942 and was used to manufacture chemical warfare materials, such as mustard (14D),

lewisite, and incendiary munitions during World War 11. From February 1953 to late 1957 RMA

manufactured the nerve agent isopropyl methylphosphonofluoridate (GB or sarin). In addition to

military activities, from 1947 to 1982 portions of R-MA were leased to private industry, including Shell

Oil Company, for manufacture of pesticides and herbicides.

Past activities at RMA resulted in contamination of alluvial groundwater with DIMP, a by-product of

GB production. This DIN/IP groundwater plume has migrated off-post, following the alluvial

groundwater flow direction to the north Sampling results in five domestic water supply wells showed

concentrations of DIMP exceeding the remediation goal of 8 ýtg/L. These results indicated that the

domestic well casings were either constructed improperly or deteriorated to the point where they were

providing conduits for DIMP contamination to reach the Arapahoe Aquifer.

1.2 Description of Remedy

The ROD for the Off-Post Operable Unit specifies that closure methods for off-post wells will be

identical to closure methods for on-post wells, and the specified closure methods were used in this

program Closure methods involved perforation and/or overdrilling, followed by pressure grouting the

entire borehole. This method seals both the well and the annulus (area between the casing and the

borehole wall) so that alluvial water can no longer flow downward into the Arapahoe Aquifer Well

casings were typically perforated over their entire length, or in some cases to the top of the screened

interval. At one location mechanical perforation was not effective, and this well was overdrilled using

the air-rotary method and the entire length of PVC casing was removed prior to grout emplacement.

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THE LATA/ARCADIS GERAGHTY & MILLER TEAM

2175000 2,180000 185 000

9144

East 117th Street

49BSA 76

395A

070A i041hAvenue

Zý9A OF

2

;30

Q.

In

3 04 37319

East 96th Street

- - - -- - - -- - - .. .. . . -L - 4L

R -AA

2.175.000 Z180.000 2.185.000

Frinwry Roads

Secondarv Roads

Light Oury Roads

cirt Roads I bla Ma fen

Railroads

mftjmý Co N.- IVAdl To Be Closed

Figure 1. Locations of Off-Post Wells Closed

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3
THE LATAIARCADIS GERAGHTY & MILLER TEAM

Because the wells were located on private property, care was taken to document pre-existing site

conditions and to return the sites to at least equivalent condition following field work.

2.0 Chronology of Events

Based on the field activities described in this report, the following major design and construction

components were accomplished:

. Removed the pumps, piping -and wiring from four of the off-post domestic wells identified in the

ROD for closure. The fifth well (299A) did not have a pump in it at the start of the program.

0 Video logged the five domestic wells to determine their construction details and develop

abandonment strategies for them.

0 Abandoned two off-post monitoring wells using cement/bentonite grout.

- Obtained well permits from the Colorado State Engineer's Office for two replacement wells

requested by the well owners (Wells 1070B and 914B) These wells replace wells 1070A and

914A. Well numbers are assigned by the TCHD Well permit numbers are issued in documents

generated by the State Engineer's Office

0 Abandoned the five domestic wells by either mechanically perforating or overdrilling their

casings and filling them with cementibentonite grout.

0 Installed two replacement wells equivalent to the existing wells, but properly constructed and

sealed to avoid downward migration of groundwater from the alluvial aquifer to the Arapahoe

Aquifer

- Performed site repairs including providing piping and electrical service to the replacement wells.

Table I provides the major project schedule execution milestones and dates of completion. The original

abandonment completion milestone of October 31, 1998 was extended to November 30 because of the

additional time required to obtain the replacement well permits and to overdrill the casing of one of the

wells that could not be perforated

Table 1. Chronology of Scheduled and Actual Project Milestones

Activity Scheduled Completion Date Actual Completion Date

Scope of Work May 22,1998 May 22,1998

Contract Award July 21, 1998 July 21, 1998

Contractor Mobilization None Established August 31, 1998

Pull Pumps and Video Log wells None Established September 2, 1998

Abandon Monitoring Wells 37304 None Established October 9, 1998 and 37319

Abandon/Replace Domestic November 30,1998 November 24, 1998 Wells

Final Inspection None Established December 16,1998

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THE LATA/ARCADIS GERAGHTY & MUER TEAM

2.1 Pump Removal and Video Logging

The pumps and associated piping and wiring were removed &om four of the five domestic wells

scheduled for abandonment to facilitate video logging the wells Well 299A did not contain any

pumping equipment. The pumps, piping and wiring were stockpiled at each well site in an area

designated by the well owner unless they requested that the equipment be removed from the site. In

these cases, the equipment was transported to RMA for recycling or disposal.

Video logging of the wells was performed in order to evaluate well construction and condition prior to

closure. In order for downhole video logging to be effective, water within the wells must be relatively

clear. To ensure water clarity in the wells, potable water was injected into the well with a hose after the

pumps were removed. The wells were then allowed to stand undisturbed for a minimum of 24 hours

before video logging was performed. Also, because of the requirement for clarity in the water column,

wells were logged downward (i.e, from surface to bottom). In this way, sediments were not disturbed

prior to logging. In all cases, water conditions in the wells were such that video logging was effective

The wells were logged using a two-inch diameter downhole camera with a downward looking wideangle lens and self-contained light source. The downhole video tool was connected to a video recorder

and a spool that automatically records depth in the borehole. A marker on the instrument cable was used

to evaluate the precision of depth measurements. The marker was aligned with a specific point on the

casing and depth recorded as zero When the tool was returned to the surface, the alignment of this

mark to the point on the casing was compared with the automated depth reading.

In several cases, video logs showed obvious leakage of water from the alluvial to Arapahoe Aquifer.

Water was seen cascading down the inside of the well casings at 1070A and 395A. In addition, the

casing in Well 995A was observed to be corroded, and several holes were identified in depth interval

that coincided with the alluvial aquifer Video logs were recorded on standard VHS tapes suitable for

playback on a VCR. These tapes were submitted to the RMA COR as part of the project file.

2.2 Monitoring Well Closure (37304 and 37319)

Per requirements of the contract statement of work (SOW), abandonment of Monitoring Wells 37304

(State Plane Coordinates 2182183E/197232N) and 37319 (State Plane Coordinates 2183504E/197609N)

was included in the scope of this project These wells were abandoned by backfilling with a mixture of

Portland cement, bentonite, and water, Grout was emplaced from the bottom up using a grout pump and

remie pipe to ensure that no void spaces were present. Protective surface casings were then removed

and the casings were cut off and capped below ground surface The amount of grout placed in each of t

the wells was greater than calculated casing volume. At 37304, the casing volume was 4.4 gallons and

10 gallons of grout was used. At 37319, the casing volume was 104 gallons and 115 gallons of grout

was used This indicates that grout was forced outward into the annulus and/or formation, effectively

closing these wells.

2.3 Domestic Well Closures

Closure of the remaining five wells was accomplished through either perforating or overdrilling the well

casing and injecting grout inside the perforated casing or open borehole through a tremie pipe.

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THE LA TAIARCADIS GERAGHTY& MILLER TEAM

Perforation was performed using either a 4- or 6-inch diameter, pneumatically powered (by pressurized

air) star-wheel perforator that creates 10, 0 1 -inch diameter perforations per foot of casing. Where the

casing diameter varied from these diameters, the tool was adjusted as required to ensure perforation of

the entire well casing.

Sealing off of the contaminated alluvial aquifer from the underlying Arapahoe Formation was

accomplished by grouting the entire length of the well casing and/or borehole This method exceeds the

requirements of the Colorado Water Well Rules which only require casing perforation and grouting

across a minimum of 20 feet at the confining layer boundary The wells were grouted with a mixture of

Portland cement, bentonite, and water. Quantities and ratios of these constituents were logged in both

field logbooks and well closure forms When the wells were completely grouted, the volume of grout

was compared with the calculated borehole volume to ensure that no void spaces were present.

Borehole-volume calculation methods and the acceptable difference between grout volume and

calculated borehole volume were presented in the Quality Assurance Project Plan (QAPP) for the OffPost Well Closure Project, Details of the abandonment of each of the five wells are provided in Table 2

and the following subsections.

2.3.1 Well 299A

2.3. 1.1 Site Preparation. The activities performed at this well to prepare it for abandonment included

cutting off the steel protective posts around the well, turning off the power supply to the well (including

lock-out/tag-out), and drilling out the pitless adapter inside the well so that the perforator could pass

down the casing.

2.3.1.2 Perforation. The well was mechanically perforated from just below the pitless adapter to a depth

of 175 feet where there was reffisal of the perforator No fiirther effort was made to perforate deeper

because the casing was already perforated well below the boundary between the alluvium and Arapahoe

Formation, which was identified as being at a depth of 47 feet on the original well log. In addition,

video logs showed that the well casing was slotted from 173 to 274 feet so grout would fill the annulus

over this depth interval

2.3.1.3 Grouting. The well casing was grouted through a tremie pipe that initially extended to a depth of

270 feet. As the grout filled the casing, the tremie pipe was removed in stages, but always remained

below the grout level. The grout was allowed to settle for several days and then topped off to bring its

level back to approximately two feet from ground surface,

2.3.1.4 Decontamination. All equipment used downhole at this location was decontaminated at the

CERCLA plant prior to mobilization to another site.

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3

C0 Table 2. Vummary of Abandonment Methods

Casing Screened Well Total Casing Perforated Overdrilled Grouted Casing Grout Location

Number Depth Depth/ Materials Interval/ Interval Interval Interval Volumes Volumes (state plane) Diameter Type PA

611 to 761 173'to 274' 2174790E so

299A 274' 411 to 2741 steel hand 8'to 175' NA 2' to 274' 237 gallons 365 gallons 201192N

slotted

6"to 10'

985A 289' 4" to 270 steel NA 1 Vto 268' NA 2'to 256' 174 gallons 270 gallons 2172683E

open hole 203575N

270'to 28.

4.5" to 74' 2186226E

395A 185' open hole steel NA T- 741 NA T- 185' 217 gallons 220 gallons 202174N

74'to 185'

4" to 457' steel to 8' 260' to 457' surface to 2184647E

914A 492' open hole PVC hand NA 215' 2' to 492' 523 gallons 680 gallons 208503N

457'to 492' 8'to 457' slotted

5"to 101, 120'to 193' 2171616E

1070A 193' 4" to 193' steel hand 6.5' to 190' NA 10'to 193' 157 gallons 195 gallons 201662N

slotted I
THE LA TAIARCADIS GERAGHTY& MILLER TEAM

2.3.1.5 Surface Closure and Site Repairs. Surface closure and site repairs performed at this site consisted

of cutting off the well casing approximately two feet below ground surface, placing a watertight

concrete seal on top of the casing up to ground surface, cutting off the remaining protective posts and

patching the asphalt paving at these locations

2.3.2 Well 985A

2.3.2.1 Site Preparation. The activities performed at this well to prepare it for abandonment included

turning off the power supply to the well and having the utility company install an insulating boot on the

overhead power line near the well to protect it from damage during raising and lowering of the drilling

rig mast.

2.3.2.2 Perforation. The 4-inch diameter casing was mechanically perforated across a depth range of I I

to 268 feet. The 6-inch surface casing was not perforated because it only extended to a depth of 10 feet,

which is well above the alluvial water table. After the perforator and drill pipe were removed from the

well the casing below a depth of 256 feet collapsed.

2.3.2.3 Grouting. The well casing was grouted through a tremie pipe that initially extended to a depth of

250 feet. As the grout filled the casing, the tremie pipe was removed in stages, but always remained

below the grout level. The grout was allowed to settle for several days and then topped off to bring its

level back to approximately two feet from ground surface.

2.3.2.4 Decontamination. All equipment used downhole at this location was decontaminated at the

CERCLA plant prior to mobilization to another site

2.3.2.5 Surface Closure and Site Repairs. Surface closure and site repairs performed at this site consisted

of cutting off the well casing approximately two feet below ground surface, placing a watertight

concrete seal on top of the grouted casing up to ground surface, removing the insulating boot from the

power line and replacing gravel in the driveway that had been washed away during the well

abandonment activities

2.3.3 Well 395A

2.3.3.1 Site Preparation. The main activity performed at this well to prepare it for abandonment consisted

of having the utility company temporarily turn off the power to the site so that the overhead power lines

over and near the well would not interfere with operation of the drill rig and other equipment during

abandonment and surface closure operations The tenants living in the two houses at the site were also

provided with motel rooms during well abandonment activities.

2.3.3.2 Perforation. The 4 5-inch diameter casing was mechanically perforated along its entire length

from the base of the well vault at seven feet to a depth of 74 feet. The well bore was uncased below this

depth

2.3.3.3 Grouting. The lower uncased portion of the well was grouted and allowed to set overnight prior to

perforating the casing. The remainder of the well was then grouted after perforation In both cases the

grout was injected through a tremie pipe that was always maintained below the grout level in the well.

Because site closure operations had to be performed immediately after abandonment so that power could

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THE LATAIARCADIS GERAGHTY & MILLER TEAM

be restored to the site, it was not possible to let the grout first set up To ensure a good surface seal of

the well casing, a bag of bentonite chips was placed on top of the grout and a steel cap was welded to the

top of the casing inside the well vault.

2.3.3.4 Decontamination. All equipment used downhole at this location was decontaminated at the

CERCLA plant prior to mobilization to another site.

2.3.3.5 Surface Closure and Site Repairs. Surface closure and site repairs performed at this site consisted

of removing all materials from the well vault, collapsing the upper two feet of the vault walls, and

backfilling the vault with fill dirt from on-site. A small portion of the vault wall near the power pole

directly east of vault was not collapsed so that the stability of the power pole would not be affected (the

power pole was observed to wobble when the east vault wall was disturbed) The landowner was

notified of this action

Z3.4 Well 914A

2.3.4.1 Site Preparation. The activities performed at this well to prepare it for abandonment included

turning off the power supply to the well and cutting down a tree next to the well to allow access with the

drilling rig.

2.3.4.2 Perforation. Mechanical perforation was unsuccessful at this well The upper 60 feet of the PVC

well casing began to collapse after application of the perforator. This apparently resulted from the fact

that the PVC casing was not held in place with grout below this depth (i e., the annulus was left open).

A rubber "basket" was pulled from the well during perforation, and was apparently used to hold the

grout from this depth to the surface. There also apparently was no seal in this well when it was

originally constructed Because the casing could not be perforated below 60 feet, it was decided to first

grout the lower portion of the well and then over drill the PVC casing to a depth well below the interface

between the alluvium and the Arapahoe Formation. The lower cased and uncased portion of the well

was grouted from total depth of 492 ft up to a depth of 217 feet and allowed to set overnight. The casing

was then drilled out using the air rotary drilling method to a depth of 215 feet Sections of PVC casing

were continuously ejected into the mud pit during these operations, indicating that the casing was

removed during overdrilling.

2 * 3.4.3 Grouting. Both the cased and uncased portions of the well were pressure grouted through a tremie

pipe that was always maintained below the grout level in the well The grout was allowed to settle for

several days and then topped off to bring its level back to approximately two feet from ground surface.

2.3.4.4 Decontamination. All equipment used downhole at this location was decontaminated at the

CERCLA plant prior to mobilization to another site

2.3.4.5 Surface Closure and Site Repairs. Surface closure and site repairs performed at this site consisted

of regrading and installing new landscaping rock in the area around the well and the replacement well,

sealing small cracks in the concrete driveway caused by the drilling rig, re-sodding the area over the

trench containing electrical and water connections to the replacement well, and repairing damage done

to the lawn sprinkler system during well abandonment and installation activities. Also, the drill cuttings

produced during overdrilling of 914A and drilling of 914B (replacement well) were contained in drums

provided by RMA and transported to RMA for management as solid waste.

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2.3.5 Well 1070A

2.3.5.1 Site Preparation. The activities performed at this well to prepare it for abandonment included

turning off the power supply to the well and trimming limbs off of a tree next to the well to allow access

with the drilling rig.

2.3.5.2 Perforation. The well was mechanically perforated from the base of the well vault at 6.5 feet to a

depth of 190 feet.

2.3.5.3 Grouting. The well casing was grouted through a tremie pipe that initially extended to a depth of

170 feet. As the grout filled the casing, the tremie pipe was removed in stages, but always remained

below the grout level. The grout was allowed to settle for several days and then topped off with two

bags of bentonite chips, which along with a steel cap welded to the top of the casing, provides a

watertight surface seal in the base of the well vault.

2.3.5.4 Decontamination. All equipment used downhole at this location was decontaminated at the

CERCLA plant prior to mobilization to another site.

2.3.5.5 Surface Closure and Site Repairs. No site repairs were required for the existing well because the

landowner requested that the well vault be kept intact. Activities performed at the replacement well

consisted of regrading the area around replacement well, re-sodding the area over the trench containing

electrical and water connections to the replacement well, and cleaning the garage walls near the

replacement well Also, the drill cuttings produced during drilling of 1070B (replacement well) were

contained in drums provided by RMA and transported to RMA for management as solid waste.

2.4 Replacement Well Construction

Replacement wells were constructed for abandoned wells 1070A and 914A These wells were

constructed in a manner compliant with Colorado Water Well Rules (2 CCR 402-2) and that ensures no

conduit exists for contaminants to migrate from the alluvial to confined aquifer The replacement wells

will be used by the property owners for irrigation. Prior to drilling the replacement wells, required

permits were obtained from the Colorado State Engineer's Office. The replacement wells were placed a

sufficient distance from the closed wells to ensure that the boreholes did not intersect, and no grout

contamination extended from the abandoned well to the replacement well Well 914B is approximately

50 feet northwest of 914A and 1070B is approximately 200 feet north of 1070A

The contaminated alluvial aquifer was sealed off from the confined aquifer in the replacement wells by

use of a watertight, steel surface (conductor) casing that extended to the alluvium/confining layer

(Arapahoe) interface and was grouted in place Beneath this, the wells were constructed with a 4-inch

PVC, flush jointed casing and a factory slotted screen To the extent possible, the replacement wells

were completed at the same depth as the abandoned wells they are replacing. Details of the replacement

well installations are provided in Table 3 and the following subsections

Rml 0319801 ftma-rpt doc/07109/99 10
THE LATAIARCADIS GERAGHTY & MILLER TEAM

Table 3. Construction Detailsfor Replacement Wells

Well 914B Well 1070B

State Plane Coordinates 208583N,2184508E 201875N, 2171661 E

Total Casing Depth 425 feet 200 feet

Surface Casing Depth 64 feet 55 feet

Surface Casing Size & Type 6 inches -steel 8 inches -steel

Well Casing Size &Type 4 inches - PVC 4 inches - PVC

Screened Interval 255 - 425 feet 120 - 200 feet

Bentonite Interval 125 - 233 feet 100- 111 feet

Grout Interval 10 - 125 feet 10 - 100 feet

Pump Depth 400 feet N/A

2.4.1 Well 914B

2.4.1.1 DriffingMethod. The surface casing for well 914B was installed and grouted through the alluvium

using hollow-stem augers. Then the 6-inch diameter boring for well 914B was initially drilled using the

air rotary method. However, after a total depth of 489 feet was reached, the bottom portion of the

borehole became unstable and the drill bit and pipe became stuck in the hole After removing the bit and

pipe and several failed attempts at re-drilling the bottom portion of the hole, which had collapsed to a

depth of 430 feet, it was decided to install the well at this approximate depth and to condition the hole

with drilling mud before attempting installation of the casing and screen.

2.4.1.2 Well Construction. The well was constructed with the casing at a depth of 425 feet with a screened

interval that extended upward from this point to a depth of 255 feet Although it was planned to install a

sand pack across the screened interval, the PVC tremie pipe installed with the casing became wedged in

the borehole and could not be moved In order to avoid losing equipment in the unstable hole, a rubber

cement basket was attached to the casing above the screen (at 255 feet) during installation and was used

to hold the bentonite and grout seal placed in the annulus above the screen. This construction method

complies with State of Colorado requirements for domestic water wells

2.4.1.3 Well Development. Development of 914B was done in three stages First, approximately 900

gallons of fresh water was circulated through the borehole after the casing and screen were installed and

before placement of the bentonite and grout seal to dilute the drilling mud in the borehole. After all the

well materials were in place, the well was bailed to remove the remainder of the drilling mud

Rml 0319801 /rma-rpt doc/07/09/99 11
THE LATAIARCADIS GERAGHTY& MILLER TEAM

Approximately 300 gallons of water were bailed from the well. The third phase was to pump the well.

A submersible pump was temporarily placed in the well and used to pump approximately 700 gallons of

water.

2.4.1.4 Pump, Piping, and Connections. The original pump, piping and wiring from 914A were reinstalled in 91413, as agreed upon by the landowner. Underground water and electric lines were run

through a pitless adapter from the well to a location in the basement of the house as agreed upon by the

landowner. In addition, a stick-up spigot was installed in the water line running from the new well to

the house. While the wiring was completed to supply power to the well, the landowner agreed to take

responsibility for completing the necessary piping to connect the well to the irrigation system.

2.4.2 Well 1070B

2.4.2. 1 Drilling Method. The surface casing for well 1070B was installed and grouted through the

alluvium and set in the confining unit using hollow-stem augers. Then the 8-inch diameter boring for

well 1070B was drilled using the air rotary method to total depth of 204 feet. An 9-inch diameter hole

was drilled to allow better access to install the sand pack, bentonite and grout in the annulus around the

casing and screen.

2.4.2.2 Well Construction. The well was constructed with the casing at a depth of 200 feet with a screened

interval that extended upward from this point to a depth of 120 feet. A sand pack was placed in the

annulus across the screened interval and overlain by bentonite and grout seals (see Table 3 for

construction details)

2.4.2.3 Well Development. Initially, the well was developed by surging and bailing Approximately 200

gallons were bailed from the well A submersible pump was then temporarily placed in the well and

used to pump approximately 500 gallons

2.4.2.4 Pump, Piping, and Connections. The original pump, piping and wiring from 1070A were not reinstalled in 107013, because the landowner wished to have new equipment in the well and took

responsibility for purchase and installation Underground water and electric lines were run through a

pitless adapter from the well to a location in the basement of the house as agreed upon by the landowner.

While the wiring was completed to supply power to the well, the landowner also agreed to take

responsibility for completing the necessary piping to connect the well to the irrigation system.

3.0 Performance Standards and Clean-Up Goals

The main goal of this project was to eliminate the potential for vertical leakage of contamination from

alluvial aquifer downward to the Arapahoe Aquifer The measures taken to achieve this goal during

abandonment of the five wells were as followsPerforation of as much as possible of the well casings prior to grouting to seal off any voids

behind the casings In all cases the perforations extended well beyond the interface of the

alluvium and Arapahoe Formation

Rm 103/9801 ftma-rpt doc/07/09/99 12
THE LA TAIARCADIS GERAGHTY & MILLER TEAM

" Overdrilling of the casing at 914A, where perforation was not possible. The casing was

completely removed from the borehole to a point well below the interface of the alluvium and

Arapahoe Formation.

" Filling the entire length of the wells with cement/bentonite grout using a tremie pipe to eliminate

the possibility of leaving voids or cavities inside the casings.

The potential for downward migration from the alluvium in the replacement wells was eliminated by

installing and grouting steel surface casings through the alluvium into the confining layer, and also

installing bentonite and grout seals in the annulus of the wells from just above the screens to within the

surface casings.

4.0 Quality Assurance/Quality Control

Quality Assurance/Quality Control (QA/QC) during the performance of the project was maintained by

adhering to the requirements of the QAPP developed as part of the Work Plan for the project. The

QA/QC checks performed during this project are described below,

4.1 Review and Oversight

Review and oversight of field activities for the Off-Post Well Closure project included review and

approval of project documents by a Certified Professional Geologist (CPG), and informal field audits.

During performance of field work, two informal audits were conducted by the Task-Order Manager. The

purpose of the audits was to evaluate compliance with the requirements of this Field Workplan

(including the QAPP) and the project Health and Safety Plan (HASP) Results of the informal audits are

summarized below

Auditor Date Activity Findings

Steve Gorin September 11. Pulling Pumps Work compliant with H&S requirements (exclusion

- Task Order 1998 zone, hard-hats, steel-toed boots, etc )

Manager Proper lock-out/tag-out of power supply to wells

Work compliant with Work Plan and QAPP

Steve Gorin October 9, Closure of wells Work compliant with H&S requirements (exclusion

Task Order 1998 37304 and 37319 zone, hard-hats, steel-toed boots, etc.)

Manager Grout mixtures/calculations compliant with QAPP,

Tremic pipe maintained below grout surface during

emplacement

In addition to' informal audits, the Task Order Manager periodically reviewed and supervised activities

throughout the field effort A geologist was also present at the work-sites throughout the field effort to

supervise and direct well abandonment, construction, and site repair activities.

4.2 Video Logging Depth Measurements

The downhole video tool is connected to a video recorder and a spool that automatically records depth in

the borehole. A marker on the instrument cable was used to evaluate the precision of depth

measurements. The marker was aligned with a specific point on the casing and depth recorded as zero

When the tool was returned to the surface, the alignment of this mark to the point on the casing was

Rml 03/9801 ftma-rpt.doc/07/09/99 13
THE LATAIARCADIS GERAGHTY & MILLER TEAM

measured and compared with the automated depth reading The differential between these two

measurements for each well is provided in Table 4 All measurements were within the acceptable

measurement precision of +/- 5%.

Table 4. Pýrecision of Video Logging Depth Measurements

Well Number Change in Depth Measurements Relative Percent Difference

Before and After Logging Runs (RPD)

299A 1 foot 0.04%

395A none 0%

914A 2 feet 0.04%

I 985A 1 foot 0.04%

1 1070A I none 0%

4.3 Grout Volumes

Volume of grout placed in abandoned wells was compared with the calculated borehole volume.

Because the casing was perforated prior to emplacement of grout, the emplaced volume was expected to

exceed the calculated borehole volume The borehole volumes shown in Table 2 were calculated using

the equation provided in the QAPP. The allowable RPD between the measured and calculated grout

volumes was set at >90% As can be seen in Table 2, the volume of grout actually used in each well was

more than its calculated volume (i e , >I 00%) This indicates that the grout filled the entire casing, and

was forced outward into the annulus and formation to effectively close the wells Where open hole was

present below casing, grout was emplaced in two lifts and volume calculations were based upon the

second lift (from bottom of casing to surface)

4.4 Well Depths

Depths of boreholes, wells, and construction materials in the wells were measured to the nearest 0.2 feet.

4.5 Documentation

To document the proper abandonment of the existing wells and construction of the replacement wells

information recorded included the following.

0 Pre-mobilization site analysis and estimate of abandonment impact to property

0 Photographic documentation of well closure area's original condition, closure procedures, and

post closure condition

* Existing well construction information, including downhole video logs

. Field notebooks

- Well Data Sheets

Rml 03/9801 ftma-rpt doc/07/09/99 14
THE LA TAIARCADIS GERAGHTY& MILLER TEAM

. Records of volumes, containers, and contents of waste disposed.

- Permit applications for new wells.

0 Lithologic logs and construction details for the two new replacement wells.

These materials are stored in the Rocky Mountain Arsenal Technical Information Center (RTIC) at

RMA.

5.0 Description and Rationale for Project Modifications

Two project modifications were required during performance of Off-Post Well Closure. These are

summarized below, and cost impacts are summarized in Section 9.0 of this Construction Completion

Report.

Modification 1: The first modification (Mod 1) was required because the drilling subcontractor did not

originally propose rates that complied with the Department of Labor (DOL) wage determinations

provided by RMA. As a result, the Contracting Officer requested a revised cost proposal with approved

DOL rates. This revised cost proposal was submitted to RMA on October 27, 1998.

Modification 2: The second modification (Mod 2) was required because well 914A could not be

abandoned by mechanical perforation and had to be overdrilled Costs for overdrilling were submitted

in the original proposal, but initial funding was based upon mechanical perforation in all wells. Because

well 914A could not be mechanically perforated, overdrilling was performed to a depth of 215 feet. A

cost proposal for this modification was submitted to RMA. on November 18, 1998.

6.0 Construction Quality Assurance Documentation Summary

Construction quality assurance documentation for the Off-Post Weil Closure project includes the

following:

Pre-construction damage estimates (submitted to RMA COR)

Well closure forms, including grout mixtures and volumes (Appendix A)

Tapes of downhole video logs (submitted to RMA COR)

Pre-construction photographs (submitted to RMA COR)

Photographs of field activities (submitted to RMA COR)

7.0 Final Inspection Documentation

A final inspection was conducted on Wednesday, December 16, 1998 to verify that wells had been

properly closed, replacement wells had been constructed, and site repairs had been adequately

performed In attendance were representatives from TCHD, CDPHE, EPA, and the RMA RVO

Following the inspection, all parties agreed that the Off-Post Well Closure project had been

satisfactorily completed A copy of the attendance list is included in Appendix B.

Rml 03/9801 /rma-rpt,doc/07/09/99 15
THE LATA'ARCADIS GERAGHTY& MILLER TEAM

8.0 Operation and Maintenance Requirements

There are no operations and maintenance requirements following well closure and construction of

replacement wells.

9.0 Summary of Costs

Table 5 summarizes project costs, including modifications. The reasons for each project modification

were discussed in Section 5.0. Funding was originally based upon the cost proposal for mechanical

perforation, but a cost proposal for over-drilling was also submitted. Mod #2 does not actually represent

an increase in proposed project costs, because costs for overdrilling, were submitted in the original proposal. In fact, the successful use of mechanical perforation in the majority of wells actually resulted

in cost savings. The project cost increased by 6.4% from the original bid because of DOL wage requirements. The increase was requested by the Contracting Officer because the rates originally provided by the driller (Layne-Western) were lower than the DOL rates required under the contract.

The calculated percent increase is based upon a project cost of $133,593, which is the combined cost of

the mechanical perforations and overdrilling performed.

Table 5. Project Cost Summary

Contract) Description Cost

Mod

Contract Odolnal Amou~nt 21 July 1998 $120,433 - Perforate

$192,319 - Overdriil Mod #1 DOL Labor Rates for Driller $8,606

Mod #2 Overdrilling atgi4A $13,160 _________Total: $142,199

10.0 CERTIFICATION

The Remediation Venture Office (RVO) has determined that the remedial action has been completed in

accordance with the ROD, has met the intent of the ROD to be protective of human health and the

environment and complies with the final design package, as modified. No Further Action is required on

this implementation project

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _

0(harles -Scharmann- Remedy Execution Manager Date'

11.0 Supporting Documents

* Rocky Mountain Arsenal Record of Decision for the Off-Post Operable Unit, December 1995

" Work Plan for Rocky Mountain Arsenal Off-Post Well Closure, September 1998

" Health and Safety Plan for Rocky Mountain Arsenal Off-Post Well Closure, September 1998

" Statement of Work for Off-Post Well Closure, July 1998

" Colorado Water Well Rules (2 CCR 402-2)

5425-1Ill -A

Rml 03/9B01 Irma-rpt.dac/07109/99 16 0 0 6 6
T74E LATAIARCADIS GERAGHTY & MILLER TEAM

APPENDIX A. WELL CLOSURE FORMS

RM103/9801/APP-A DOC/07109/99 A-1
RENfEDIATION VENTURE OMCE

Well Closure

Wellnumber 2 ýKA project Pý-( -45ý (1)61( A4AVz4ItAfaý.ge_ I of- 2

Site Location- 0 A v c H E P, dc ks Pi

Date Started Mýlqy Date Completed_ (

Surveyed Location NM N Surveyed Elevation GS*

TOC** Aj M

E

Depth to Water (TOC)/Date (60ýZ 1137f6r Casing Depth (GS) 2:FqDrilling Contractor L 4 ý h Type of Rig 6-

Prepared By_ Date

Well Construction HistM

Original Depth of Well (GS) 2 q 0 Original Bore-Hole Depth ý2

Type Diameter TOP Bottom

Borehole- 7 :?/,r " -/. F.2 / ý- ' -4 2- 70

Casing #1 srýtd C 0 76

Casing #2 -76 C COEK f, ir S,ý: Ifo

Casing,11

Closure Drilliniz Log

Depth Closure Boring Drilled (feet) li-CA

Diameter Closure Boring (inches)

Drilling Method

Depth to Water (GS) Date

Sample Tkenl Sample Volume

Geophysical Logs

Geophysical Contractor

Perforation Method C /194 i C.1 5 fA*Q tiA 6e(

Perforation Depth (GS) F - /

OGS Ground Surface **TOC - Top of Casing
REMEDIATION VENTURE OFFICE

Well Closure

well number A Project im 15 rtý. Page - 2-.f- 2-

Casin Removal

Drilled? Footage Pulled? Footage

Protective Casing

Casing #1

C asing 

#2

Casing #3

Screen or Casing Le

Screen or Diameter Material TOP Of Bottom of

Casin (Inchesl Or type (Feet) (Feet)

Interval #1 S7 /"%Cl

Interval #2 CAF(!ý2 _J 1ý1- le 7ý6 -73

Interval #3 4L- It /73

Interval #4

Sealing Specifics

Method of Sealing ýLA pup V It ILIJ S i al,ý: CASt' o 1 4 ýýt:tA VA CC, C-79- ý0 4A 4t dJ

Depth Tremic Pipe Placed (feet below GS)

Sand/fill (Interval Seal #1 (Interval) Seal #2 (Interval

Material &44 bi.ý -

% Bentonite s-',/.

Gal. Water /Bag

(or Est. Grout Density)

Date Added

Comments
REMEDIATION VENTURE OMCE

W llnumber 

ý57 

Well Closure

e 

m6mý Page_ 1 of 2

Site Location E. w cx cr C 0

Date Started 0116 /1 F Date Completed

Surveyed Location N Surveyed Elevation GS*

TOC** N LM

Depth to Water (TOC)tDate 3311'( 6 Casing Depth (GS)

Drilling Contractor LAýAe Type of Rig

Prepared By Date

Well Construction Histo[y

Original Depth of Well (GS) ýk Ck k K &j - Original Bore-Hole Depth Ljý Pýk IA 0 LV L4

Type Diameter MAE Bottom

Borehole- A Agwvi

Casing #1 T"

Casing #2 /A, sCasing #3

Closure Drilliniz Log

Depth Closure Boring Drilled (feet) JA 04 A49 Or-,19 16

Diameter Closure Boring (inches)

Drilling Method

Depth to Water (GS) Date

Sample Taken? Sample Volume

Geophysical Logs

Geophysical Contractor

Perforation Method _5-ýAiA Cj A ee

Perforation Depth (GS) _ 7 /_

*GS - Ground Surface **TOC - Top of Casing
REMEDIATION VE'I,=RE OFFICE

- -A Well Closure Page 2 of 2

well number 75 ploilct qledsý U 6 1/ tý 64

Casing Removal

Drilled? Footage Pulled? Footage

Protective Casing ylo-ý jýeý11046ýf

Casing #I

Casing #2

Casing #3

Screen or Casing Le

Screen or Diameter Material TOP Of Bottom of

Casin (Inches) Ortyp (Feet) (Feet)

Interval #1 S, S'(E LL

Interval #2

Interval 11

Interval #4

Sealing Specifics

Method of Sealing it a Ae)lr 140joqx;!]ý m%K IML4. V&W

Depth Tremie Pipe Placed (feet below GS)

Sandfrill (Interval Seal #1 (Interval) Seal #2 (Interval)

Material e-e -e 'I V

% Bentonite c- r.

Gal. Water Mag -7,

(or Est. Grout Density)

Date Added

Comments
REMEDIATION VENTURE OFFICE

Well Closure

Wellnumber ý4A Prolect fos 46A film A4 ft 6age I of 2

Site Location-/ 4

Date Started Date Completed_ 1ý)12 7 A7 E'

Surveyed Location /YM N Surveyed Elevation GS0 . /VM

TOC** /Yw

E

Depth to Water (TOCYDate 77z /q F Casing Depth (GS)

Drilling Contractor -Type of Rig

Prepared By 4 Date /

Well Construction HistoEy

Original Depth of Well (GS) Original Bore-Hole Depth

Lze Diameter LOB Bottom

Borehole 6 /" 7Ld iffý2 /

Cuing I 1 5- -ýCr- 0 8

Casing #2 CCasing #3

Closure Drilling Log

Depth Closure Boring Drilled (feet) SDiameter Closure Boring (inches)

Drilling Method 7'ý 14 Y

Depth to Water (GS) Date 76 //Fbý

Sample Take.? Simple Volume

Geophysical Logs A o/I C-

'0

Geophysical Contractor

Perforation Method 0

Perforation Depth (GS)

OGS Ground Surface **TOC Top of Casing
REMEDIATION VENTURE OFFICE

Well Closure

well number Pj.rt OtT-Aes- 616- ff 4 of Kpage - 2-of

Casing Removal

Drilled ? Footage Pulled? Footage

Protective Casing 12 a Ile -eý,

Casing #1 20 f

Casing #2

Casing #3

Screen or Casing Le

Screen or Diameter Material TOP Of Bottom of

Casin (Inchesl Or typ (Feet) t)

Interval #1 (f 0

Interval #2

Interval 11

Interval #4

Sealing Specifics

Method of Sealing I)a 0 g0-26A7ý- /'IAS Co,160 kdle,, 'blow

tX 7-

Depth Tremie Pipe Placed (feet below GS)

Sand/rill (Interval) Seal #1 (Interval) Seal #2 (Interval

Material

% Rentonite

Gal. Water /Bag

(or Est. Grout Density)

Date Added 69 ý12 -3 12 V?

Comments
RET%,IEDIATION VENTURE OFFICE

Well Closure

Wellnumber off -ý& ý ýJj- ý1AbrLWMj4jý,,t.76p,gc_ l - of

SiteLocation ZAjým d, (G /94ý UCJA47Xý.11-1 CQ

Date Started (04rl,7s Date Completed_ ile&M fr

Surveyed Location Nw N Surveyed Elevation GSO . /Yw

TOC** /VM

E

Depth to Water (TOCYDate Casing Depth (GS) ;2 SIP

Drilling Contractor Z /I Y tic Type of Rig CPU 7sPrepared By S ý'Ope Date / le ? 7

Well Construction Histo[y

Original Depth of Well (GS) Original Bore-Hole Depth

Type Diameter TOP Bottom

Borehole- -74" ý,, 20 6 270 7p,-r, Vo -3/sý'

Casing # 1 5; ýrcý 6 /,0/,

Casing #2 .57 -1C--&-( I,-"e 0 2?0

Casing #3 cw 2 31 S- I

Closure Drilliniz Loiz

Depth Closure Boring Drflled (feet) JA cr-ý- 'I

Diameter Closure Boring (inches)

Drilling Method

Depth to Water (GS) Date

Sample Taken? Sample Volume

Geophysical Logs

Geophysical Contractor

Perforation Method VA E C t C44 A/f V, 6d ýed

Perforation Depth (GS) _ Z/ ?-6'9-

*GS - Ground Surface OTOC - Top of Casing
REMEDIAMON VENTURE OFFICE

Well Closure

well number project P05Y 6)e ý/ 4 4,q k", "o M Page _ 2_of- 2-

Casing Removal

Drilled ? Footage Pulled? Footage

Protective Casing

Casing #I 7d I Ct

Casing #2

Casing #3

Screen or Casing Le

Sc-reen or Diameter Material TOP Of Bottom of

Casin (Inches) Or typ (Feet) (Feet)

Interval #1

Interval #2 C,451 5- ýC&

Interval #3

Interval #4

Sealing Specifics

Method of Scaling 02CLý2 M fktý14 r;qdr r/fl-/`/ký or

Depth Tremic Pipe Placed (feet below GS) S-0

Sand/f ill (Interval Seal #1 (Interval) Seal #2 (Interval

Material 6 .2

% Bcntonite

Gal. Water /Bag

(or Est. Grout Density)

Date Added 16 Ire

Comments ý0 44 

/C)
RENIEDIATION VENTURE OFFICE

Well Closure

Wellnumber project of

SiteLocation or 0 ik

Date Started //5/9v- Date Completed_ ---/ Iltl A ?

Surveyed Location IN N Surveyed Elevation GS* AIM

TOC$*

E

Depth to Water (TOCYDate Casing Depth (GS)

Drilling Contractor L Type of Rig rw

PreparedBy-4 Slw` Date 141eq r

Well Construction History

Original Depth of Well (GS) Original Bore-Hole Depth

Type Diameter L02 Bottom

Borehole =774*' ý ý20 -T'-

Casing #1 -5 & ,L- ( ý- 49

Casing #2 4- /0-( ;2 a

Casing #3 (ý20

Closure Driffina Log

Depth Closure Boring DriUed (feet) If I/C

Diameter Closure Boring (inches)

Drilling Method

Depth to Water (GS) Date

Sample Takenl Sample Volume

Geophysical Logs

Geophysical Contractor

Perforation Method 1Aj f r,6 Aw cof s ýAK 61 A pc

Perforation Depth (GS) 0

OGS Ground Surface **TOC - Top of Casing
REMEDIATION VENTURE OFFICE

Well Closure

well number 06C-4574 P-ge- 2-of-2-

Casing Removal

Drilled ? Footage Pulled? Footage

Protective Casing klo-ý

Casing #I

Casing #2

Casing #3

Screen or Casing Le

Screen or Diameter Material TOP Of Bottom of

Casin (Inches) or typ (Feet) (Feet)

Interval #1 h5; ot% 57 6 / /o/

Interval #2 CA5ýhq /0//

C / , q-P Interval #3 6 le- X t

Interval #4

Sealing Specifics

Method of Sealing L-A ýA- a kýý J/tA-rýa/e I oe

Depth Tremie Pipe Placed (feet below GS) Y117

Sand/fill (Interval Seal #1 (Interval) Seal #2 (Interval

Material

% Bentonite

Gal. Water Mag 9W

(or Est. Grout Density)

Date Added

Comments
RENEDIATION VENTURE OFFICE

Well Closure

Wcllnumber off- A S-ý 6J6 JýA6 6 11 ýPage - i of 2

SiteLocation- 57E-Yf 5cclq- T25 -,

Date Started ý? lf8- Date Completed 0 7YT ý

Surveyed Location N M N Surveyed Elevation GS* -5-14zq. r2

TOC** 7

E

Depth to Water (170C)(Date 0 1(6A 11 t Cuing Depth (GS)

Dfflling Contractor L AV sA F- Type of Rig W E- TSPrepared By Date

Well Construction Histo[y

Origirml Depth of Well (GS) Original Bore-Hole Depth

Twe Diameter ZO.2 Bottom

Borehole (A. PL ý N7W VA

Casing#l 50/d A/C- 4 1, 1C. 6-

Casing #2 U C- 5'CoeC6 2,

Cuing #I

Closure Drilliniz Log

Depth Closure Boring Drilled (feet) L4 0_ý A 11p /;c A

Diameter Closure Boring (inches)

Drilling Method

Depth to Water (GS) Date

Sample Takeril Sample Volume

Geophysical Logs

Geophysical Contractor

Perforation Method

Perforation Depth (GS)

*GS Ground Surface **TOC - Top of Casing
REMEDIATION VENTURE OFFICE

Well Closure

well number 3 -Proiect OtT- Pd-'ý 0& ( ( A ý-' Page _ 2-of-2-

Casiniz Removal

Drilled ? Footage Pulled? Footage

Protective Casing

Casing #1

Casing #2

Casing #3

Screen or Casing Le

Screen or Diameter Material TOP Of Bottom of

Casin (Inches) or typ (Feet) (Feet)

Interval # I CA$ /',Kl, a" /VC- .2- / 16.

Interval #2 Olt to V- 2

Interval 113

Interval #4

Sealing Snecifics

Method of Sealing ýp U K 440 Pt 4- A--r d r La e, C A al S- C

Depth Tremic Pipe Placed (feet below GS) 0 r4 C,(-rtd ýrCAOS6ý &J611

Sand./f ill (Interval Seal #1 (Interval) Seal #2 (Interval

Material CC W k ýV .2 .2.17

% Bentonite

Gal. Water /Big 7 W/ ul:!

(or Est. Grout Density)

Date Added

Comments
REMEDIATION VENTURE OFFICE

Well Closure

Wellnumber - Project OW 464j6'1'"66Aage- 1 of 2

SiteLocation 6-7 0

Date Started Date Completed_

Surveyed Location N Surveyed Elevation GS*

TOC** Z6, 3

E

Depth to Water CrOC)(Date 1-23 4 1(01qýItf Casing Depth (GS)

Drilling Contractor A Type of Rig

Prepared By_ 5 Date

Well Construction Histo[y

Original Depth of Well (GS) Original Bore-Hole Depth

Tvve Diameter LOB Bottom

Borehole- (6" 4 C, 2 7 S-.3 4o ( i (. sCasing #1 '5ýLel - t '571

Casing#2 56(.d pv(- q- fir 1 It-S ýL

Casing #3 POC '57C(tettA /s* TsS-Lý. TsCIosure Drilliniz Loiz

Depth Closure Boring Drilled (feet)

Diameter Closure Boring (inches)

Drilling Method

Depth to Water (GS) Date

Sample Takenl Sample Volume

Geophysical Lop

Geophysical Contractor

Perforation Method

Perforation Depth (GS)

*GS Ground Surfkca **TOC - Top of Casing
REMEDIATION VENTURE OFFICE

Well Closure

well number Pj,c 0 n+ U Aý A J 6 AL,4 F tAý Page

Casing Removal

Drilled I Footage Pulled? Footage

Protective Casing

Casing #1 (t

Casing #2

Casing #3

Screen or Casing Le

Screen or Diameter Material TOP Of Bottom of

Casin (inches) Ortype (Feet) (Feet)

(VC 3 1 Interval #1 C65ftý4 ( 'Pse - t

Interval #2 5,cgteVN pvc ý5-

Interval #3 V

Interval #4

Sealing Specifics

Method of Sealing OUVA C E VA E 'A4 I -Ju CASýKj&-

Depth Tremic Pipe Placed (feet below GS) I S* 0

Sand(f t It (rnterval Seal #1 (rnterva Seal #2 (Interval)

Material ce KAEtt 3

% Bentonite

Gal. Water /Bag Z (ol .4

(or Est. Grout Density)

Date Added

Comments
F 0 R M STATE OF COLORADO For Office Use only

"G. OFFICE OF THE STATE ENGINEER

GWS-9 818 Centennial Bldg., 1313 Sherman St.. Denver, Colorado 80203

12195 (303) 866-3581

TYPE OR PRINT IN 13LACK INK

WELL ABANDONMENT REPORT

(To Report Plugging and Sealing Wells)

PERMIT NUMBER OF PLUGGED WELL T-t)

1. INDIVIDUAL/COMPANY RESPONSIBLE FOR PLUGGING

NAME(S) tas 41A*uo_3'7e_-r_4nieW 4s-s-ac,lýlcs, Zýc.

Mailing Address IS M Cp /,9 ýdlt'4 Y/Y 5ý6_ ýS_0

City, St. zip C-dyc'n

Phone (34;' ),Z4,a, 3S-ý 6

2. ACTUAL WELL LOCATION: COUNTY- S

PROPERTYADDRESS Ir)-T'30 lix. H&vJee-s-op, ý_O ý?0(6clO

(Address) (City) (State) (Zip)

1/4 SE 1/4, Sec. 'T Twp. El N. MS., Range 6-7 0E. 0W. 9 P.M.

Distancesfro-n SectionLin s 1700 Yt.fromON. NS. Line, Ft.fromME. orE1W. Line.

3. 1 (we), report that an existing well was plugged and sealed for the following reason(s):

The well was plugged and sealed as required under the conditions of

approval of Well Permit No.

The well was not in use and was plugged and sealed.

Other (please explain)

4. The well was plugged and sealed according to the Water Well Construction

Rules on OCI L 6 ý 6- K IS- , 19 q90 -

5. The well was plugged with the following materials placed at the indicated intervals:

AMOUNT AND TYPE OF MATERIAL METHOD OF PLACEMENT INTERVAL

7tý 6-M (ý16ý from feet to feet

from feet to feet

f rom feet to feet

f rom feet to feet

INTERVALS OF CASING REMOVED4E io IN FEET from feet to 2 92feet

from feet to -feet

6. 1 (we) have read the statements made herein and know the contents thereof, and that they are true to my (our)

knowledge. [Pursuant to Section 24-4-104 (1 3)(a) C.R.S., the making of false statements herein constitutes perjurý

in the second deqree and is punishable as a class I misdemeanor.1

Name/Title (Please type or print) Signature Date

ft(ýLtý ?-. 60r;,J I Pr,)ýJ /4-ý 1 ý1ýlq

INFORMATION~ It is the responsibility of the well owner to have the well properly plugged and sealed. The Well

--Construction Contractor is responsible for notifying the well owner of the plugging and sealing requirement.

This form may be reproduced by photocopy or word processing means.
0 R M STATE OF COLORADO For Office Use only 0. OFFICE OF THE STATE ENGINEER GWS-9

2/95 818 Centennial Bldg., 1313 Sherman St., Denver, Colorado 80203

(3031866-3581

PE OR PRINT IN BLACK INK

WELL ABANDONMENT REPORT

(To Report Plugging and Sealing Wells)

FERMIT NUMBER OF PLUGGED WELL

1. INDIVIDUAL/COMPANY RESPONSIBLE FOR PLUGGING

NAME(S)

Mailing Address /S IF e4rLý', ýYA c2

city, St. zip C-6, ýJ6-m

Phone (,?.0-3

2. ACTUAL WELL LOCATION: COUNTY AdAM 5

PROPERTY ADDRESS C790 0 E- Iq v6-. vi Wciesv,\ C

(Address) (City) (State) (Zip)

1`1771

5E-1 /4 ( J 1/4, Sec. 0 Twp. Q, EIN. E S., Range E. 1.41 W. 6 P. M.

Distances from Section Lines -f"O Ft. f rom 0 N. M S. Line, / -700 Ft. f rom 7 E. or M W. Line,

3. 1 (we), report that an existing well was plugged and sealed for the following reason(s):

The well was plugged and sealed as required under the conditions of

approval of Well Permit No.

Z] The well was not in use and was plugged and sealed.

17 Other (please explain)

4. The well was plugged and sealed according to the Water Well Construction

Rules on c(-406ex, 17 -, 19 C(3 .

5. The well was plugged with the following materials placed at the indicated intervals:

AMOUNT AND TYPE OF MATERIAL METHOD OF PLACEMENT INTERVAL

365 A/ý- - CE bti4 16,cm ýj q t-ýr ýXOL&-ý tk EVA ('6 from o2, feet to -2?ý '(-feet

from feet to feet

from feet to feet

f rom feet to feet

INTERVALS OF CASING REMOVEýý FEET from 9 feet to 1:7 eet

from feet to feet

6. 1 (we) have read the statements made herein and know the contents thereof, and that they are true to my (our)

knowledge. (Pursuant to Section 24-4-104 (13) (a) C.R.S., the making of false statements herein constitutes perjurN

in the second degree and is ounishable as a class 1 misdemeanor.]

Name/Title (Please type or print) e Date

s4eý4 P. 60/'TýJ / &6j-ký L4t"' I ;V :-ý - 1//Oý

--INFORMATION-- It is the responsibility of the well owner to have the well properly plugged and sealed. The Well

Construction Contractor is responsible for notifying the well owner of the plugging and sealing requirement.

Thfs form may be reproduced by photocopy or word processing means.
0. OFFICE OF THE STATE ENGINEER

0 R M STATE OF COLORADO 

For Office Use only

818 Centennisi Bidg., 1313 Sherman St., Denver, Colorado 8020321195 (3031 866-3581

PE OR PRINT IN BLACK INK

WELL ABANDONMENT REPORT

(To Report Plugging and Sealing Wells)

PERMIT ER NUMBER OF PLUGGED WELL 30ýý'

1. LNINDIVIDUAL/COMPANY RESPONSIBLE FOR PLUGGING

M i g

City S1

N M -7-r

DI

AME(S) La,

Mailing Address IS

city, St. zip

P 0 1

Phone (30-3

2. ACTUAL WELL LOCATION: COUNTY A V0_5

PROPERTY ADDRESS -?57Z I E-, / b A v e-, vL ýts oti _C0 FL06ý-o

(Address) (City) (State) (Zip)

5-F- 1/4 SE- 1/4, Sec. 7 Twp. ON. 22ý11 S., Range 1:1 E. 'L'A7CJ4'W. P.M.

Distances from Section Lines Ft. from 1:1 N. Z S. Line, L'7(3 Ft. from IKE. or7W. Line.

3. 1 (we), report that an existing well was plugged and sealed for the following reason(s):

The well was plugged and sealed as required under the conditions of

approval of Well Permit No.

The well was not in use and was plugged and sealed.

Fý Other (please explain)

4. The well was plugged and sealed according to the Water Well Construction

Rules on IV6 uc vý_6 et,ý (3 _, 1 9_ýg .

5. The well was plugged with the following materials placed at the indicated intervals:

AMOUNT AND TYPE OF MATERIAL METHOD OF PLACEMENT INTERVAL

4c 60 " 6ý from /Cfeetto /f3feet

from feet to feet

-from feet to feet

from feet to feet

INTERVALS OF CASING REMOVED411ý 1\1 FEET from 9-S-_ feet to feet

I from feet to -feet

6. 1 (we) have read the statements made herein and know the contents thereof, and that they are true to my (our)

knowledge. [Pursuant to Section 24-4-104 (13)(a) C.R.S., the making of false statements herein constitutes perjurý

in the second dearee and is CLInishable as a class 1 misdemeanor.]

Name[Title (Please type or print) Signqture Date

INFORMATION~ It is the responsibility of the well owner to have the well properly plugged and sealed. The Well

Construction Contractor is responsible for notifying the well owner of the plugging and sealing requirement.

This form may be reproduced by photocopy or word processing means.
STATE OF COLORADO For Office Use only 0. OFFICE OF THE STATE ENGINEER

2/95 818 Centenniai Bldg., 1313 Sherman St., Denver, Colorado 80203

IllyPE OR PRINT IN BLACK INK

WELL ABANDONMENT REPORT

(To Report Plugging and Sealing Wells)

PERMIT E NUMBER OF PLUGGED WELL 13

1. ýNQ INDIVIDUAL/COMPANY RESPONSIBLE FOR PLUGGING

N M

City S'

AME(S) Ij Los Alýmo-5 ý7 14 S-Cacilt4s Z C.

Mai g C-1ý7 41vi, ailing Address

city, St. zip Gcý' ýCfG 61 L L9

IV

P 

0 Phone (303 .2 0,1- 39

2. ACTUAL WELL LOCATION: COUNTY A d'ýqmv

PROPERTY ADDRESS 1;2, ziJ:( f, 11'7d--+ý AV&; Hemc&vu -o co

PR 

(Address) 

(City) 

(State) (Zip)

is

1/4 '!ýW 1/4, Sec. Tw p. El N. Z S., Range DE.Ew. 6 P.m.

I (w )

Distances 0U from Section Lines 2 00 Ft. from 0 N. Z S. Line, 7 00 Ft. f rom 0 E. or W. Line.

Fý Tl_

3. 1 (we), P report that an existing well was plugged and sealed for the following reason(s):

Fý The well was plugged and sealed as required under the conditions of

approval of Well Permit No.

The well was not in use and was plugged and sealed.

Other (please explain)

4. The well was plugged and seaied according to the Water Well Construction

Rules on CCý06Gi-0- 2ý , 19 7? .

5. The well was plugged with the following materials placed at the indicated intervals:

AMOUNT AND TYPE OF MATERIAL METHOD OF PLACEMENT INTERVAL

-L IqIS EVA Ký169 It /a ki ýlf- a LIC4 from 0 feet to feet

from feet to feet

f rom feet to feet

f rom feet to feet

INTERVALS OF CASINGýý/RIPPED IN FEET f rom 0 feet to -:ZIS-feet

I from feet to feet

6. 1 (we) have read the statements made herein and know the contents thereof, and that they are true to my (our)

knowledge. [Pursuant to Section 24-4-104 (13)(a) C.R.S., the making of false statements herein constitutes perjurý

in the sE:cond degree and is punishable as a class 1 misdemeanor.]

NamefTitle (Please type or print) e Date

Plr# . j,(, ý A,.ý I / 1ý 117

j I S I

--INFORMATION-- It is the responsibility of the well owner to have the well properly plugged and sealed. The Well

Construction Contractor is responsible for notifying the well owner of the plugging and sealing requirement.

This form may be reproduced by photocopy or word processing means.
0 R M STATE OF COLORADO For Office Use only 0. OFFICE OF THE STATE ENGINEER

GWS-9

2/95 1118 Centennial Bldg., 1313 Sherman St., Denver, Colorado 80203

(3031 866-3581

TYPE OR PRINT IN BLACK INK

WELL ABANDONMENT REPORT

(To Report Plugging and Sealing Wells)

PERMIT NUMBER OF PLUGGED WELL upiýlllwvl

1. INDIVIDUAL/COMPANY RESPONSIBLE FOR PLUGGING

NAME(S) 7ý-s,

Mailing Address 1,936' C-,ýCz0ly /S

city, St. zip co ?e Of /

Phone (7d3

2. ACTUA WELL LOCATION: COUNTY

PROPERTY ADDRESS 133,;- 0 Z-, M Iq v s-.

(Address) (City) (State) P)

1/4 56 114, Sec. ý,Z Twp. 7N."S.,Range 6;Z 7E.CRW. P.M.

Distances from Section Lines 5-00 Ft. from 1:1 N. 3 S. Line, 2-5'0 () Ft. from 2 E. or 0 W. Line.

3. 1 (we), report that an existing well was plugged and sealed for the following reason(s):

The well was plugged and sealed as required under the conditions of

approval of Well Permit No.

The well was not in use and was plugged and sealed.

Fý Other (please explain)

4. The well was, plupged and sealed according to the Water Well Construction

Rules on 0& 7a 6 ev- / 6' -, 1 9-ZL.

5. The well was plugged with the following materials placed at the indicated intervals:

AMOUNT AND TYPE OF MATERIAL METHOD OF PLACEMENT INTERVAL

9,451 e'e &u L- Aý,IL6 4 ; /C- - 7'e 0 Pt 71- 44,cm is- from feet to ff-f eet

from feet to feet

from feet to feet

INTERVALS OF CASING REMOVEZ CIRIP from feet to feet

DPE ý IN FEET from feet to 7-f- feet

from feet to feet

6. 1 (we) have read the statements made herein and know the contents thereof, and that they are true to my (our)

knowledge. [Pursuant to Section 24-4-104 (13)(a) C.R.S., the making of false statements herein constitutes perjur-9

in the second degree and is punishable as a class 1 misdemeanor.]

Nýrqe/Tjtle (Please type or print) Signature Date

-INFORMATION- It is the responsibility of the well owner to have the well properly plugged and sealed. The Well

Construction Contractor is responsible for notifying the well owner of the plugging and sealing requirement.

This form may be reproduced by photocopy or word processing means.
THE LATAIARCADIS GERAG14TY & MILLER TEAM

APPENDIX B. FINAL INSPECTION ATTENDANCE LIST

RM1 03/9801 /APP-A DOC/07/09/99 B-1
Final Insvection Attendance List

Attendee Organization

Sam Garcia EPA

Laura Williams EPA

Ed Larock CDPHE

Stephen Smith RVO

Tim Kilgannon RVO

Cindy Fullerton TCHD

Hugh Blaney Army Contracting Officer

James Pearce NIKE

Steve Gorin LATA

Neville Gaggiani Contracting Officer's

Repr sentative
THE LA TAIARCADIS GERAGHTY& MILLER TEAM

APPENDIX C. PHOTOGRAPHS

RM1 0319801 /APP-A DOC/07/09/99 C-1
Original Configuration of Well 299A
Pulling Pump at Well 914A
AMEN

Perforating Casing at Well 1070A
1.

Drilling Mud Collection for Replacement Well 914B
Pulling Pump at Well 985A
Mechanical Star Wheel Perforator
I 

I

Mud-Rotary Drilling at Well 914A
Drilling Replacement Well 1070B
Well Vault at 395A with Overhead Wires
Former Site of Closed Well 299A
Former Site of Closed Well 985A
MILL

Connection/Spigot for Replacement Well 914B
Former Site of Closed Well 1070A
Former Site of Closed Well 395A
Replacement Well 914B