DRAFT



## WORK PLAN FOR ROCKY MOUNTAIN ARSENAL

OFF-POST WELL CLOSURE

PREPARED FOR:

RMA-CBDCOM PREPARED BY: LATA/AG&M TEAM



# ARCADIS GERAGHTY&MILLER 3603-1/1-A 00011312

## Contents
Section Page 1. Well Closure and Abandonment Plan ...................................................................................... I 1.0 Background ..................................................................................................................... 1 2.0 Purpose and Scope ........................................................................................................... I 3.0 Field Work Plan ............................................................................................................... I I I Site Reconnaissance ................................................................................................ 1 1.1 Potential Property Damage Assessment ....................................................... I 33.1.2 Utility Clearance .......................................................................................... 3) 3.2 Site Preparation ...................................................................................................... 4 3.2.1 Well Preparation .......................................................................................... 4 -3) Video Logging ........................................................................................................ 5 )..).I Well Preparation .......................................................................................... 5 .)..).2 Logging Methods and Procedures ............................................................... 5 .3.3.3 Documentation and Reporting ..................................................................... 6 )..).4 Decontamination .......................................................................................... 7 3.4 Well Closure ........................................................................................................... 7 33.4.1 Equipment and Procedures .......................................................................... 7 n.).4.2 Documentation ............................................................................................. 8 4.3 Decontamination .......................................................................................... 9 3.5 Drilling Plan forPlacement Wells .......................................................................... 9 3.).5.1 Equipment and Procedures .......................................................................... 9 5.2 Documentation ........................................................................................... 10 -3

.5.3 Decontamination ........................................................................................ 10 3.6 Site Repair/Restoration ......................................................................................... II

### Contents (continued)
Section Page 11. Quality Assurance Project Plan .............................................................................................. 12 1.0 Background ................................................................................................................... 12 2.0 Review and Oversight ................................................................................................... 12 2.1 CPG Review and Approval .................................................................................. 12 2.2 Informal Audits .................................................................................................... 13 .3.0 Quality Assurance/Quality Control (QA/QC) ofMeasurements .................................. 13 4.0 Documentation .............................................................................................................. 16 111. Waste Management and Disposal Plan .................................................................................. 20 IV. Health and Safety Plan .................................................................................. Bound Separately

iiiTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT 1.WELL CLOSURE AND ABANDONMENT PLAN 1.0 Background The Los Alamos Technical Associates (LATA)/Arcadis Geraghty and Miller (AG&M) Team will perform closure and abandonment ofseven (7) off-post wells at Rocky Mountain Arsenal. as described inthe 22 May 1998 Statement ofWork (SOW). This work will beperformed under delivery order (DO) 0002 ofcontract #DAAM02-97-D-0007, issued by RMA on 21 July 1998. The anticipated start-date for the field effort is IAugust 1998, with completion ofwork by 3 )I October 1998. Project organization. responsibilities. and schedule arepresented inthe Task Order Management Plan (TOMP) forthis effort. The Health and Safety Plan for the well closure program was prepared as a stand-alone document, and will bereviewed and signed by all workers atthe field sites. 2.0 Purpose and Scope Under the Record ofDecision (ROD) forthe Off-Post Operable Unit atRMA. criteria were set for abandonment ofwells in the Off-Post Studv Area. The scope ofthis effort is abandonment of se-..,en off-post wells. Six ofthe wells are completed in the confined aquifer and need to be abandoned to prevent migration ofcontaminants from the alluvial system to the underlying confined aquifer through the well bore. The other well is completed in the alluvial aquifer and will be abandoned by backfilling/plugging. Locations ofthe seven (7)wells scheduled for closure are shown in Appendix A ofthe SOW. 3.0 Field Work Plan The following sections describe field activities associated with the off-postwell closure. Table I summarizes known information about the off-post wells. including casing diameters, completion depths. and locations.

rml02/9802/text doc/8/14/98 DRAFTTable 1.Sunimaryof Kitowit Well hiforiiialioiz

(D co 0 Well ID Coordinates (E/N) Depth (ft) BoreholeDiameter (in) Casing Diameter (in) Casing Type Completed Aquifer 395A 2186226/202174 Unknown (300 Unknown Unknown Unknown Unknown reported byowner) M 0 2 Q 914A 2184647/208503 480 6 4 Plastic Confined Q Z25 985A 2172683/203575 315 7at0-20 ft 6at 0-20 ft Steel0-270 Confined Q ZD- 6 at 20-270 ft 4.5 at 0-270 ft Open 270-315 rn co 4.5 at 270-315 ft hole at270-315 ft 299A 2174790/201192 290 77/8 at0-92 ft 65/8 at0-92 ft Steel Confined 6at92-290 ft 4.5 at76-290 1070A 2171616/201662 Unknown Unknown Unknown Unknown Confined A (suspected 200) 37304 2182183/197232 25 4 2 PVC Unconfined 37319 2183504/197609 1715 963 2 PVC Confined

;u > n nTHELATAIARCADIS GEPAGHTY& MILLER TEW DRAFT 3.1 SiteReconnaissance Because the off-post wells scheduled for closure are onprivate property. sitereconnaissance will beperformed to identify and minimize potential property damages. In addition, utility clearance will be performed priorto any on-site excavation or drilling activities. 3.1.1 PotentialProperty DamageAssessment The LATA/AG&M Team will perform a detailed site analysis priorto beginning field work. The intent ofthis effort is to identify all potential damages toproperty that may result from well abandonment activities and/or construction ofnew wells. The features evaluated will include: " Potential damage to landscaping (i.e.. lawns, trees. shrubs. and gardens) " Potential driveway damages. " Potential damage to structures The LATA/AG&M Team will document site conditions priorto well abandonment by taking photographs and detailed field notes. Photographs will include landscape features (i.e.. lawns, trees. and shrubs). condition ofdrivewa,ý s. and an-Y other features that may potentially be damaged during site work. These photographs may be compared with conditions following well abandonment to ascertain the extent ofanN property damages. Prior to initiation ofwell closure at each location. the LATA/AG&M Team,ývill submit a letterto the Contracting Officer's Representative (COR) describing our best estimate ofdally property damages expected from site activities. 3.1.2 Utility Clearance Prior to any intrusive work (i.e.. digging or drilling), local utility companies will be contacted to provide site clearance. Utilivy clearances A illbe performed fortelephone. electrical, water, and natural gas line. and will be coordinated through the Utility Notification Center ofColorado (T-JNCC). Utilit-, companies "ill be responsible formarking locations ofunderground utilities in

rml02/9802/text doc/8/14198 DRAFTTHELATAIARCADIS GEPAGHTY& MILLER TEAM DRAFT the areas. Ifany underground utility lines not located by autility company are inadvertently encountered during excavation, the COR will be notified and the utility line left inplace untilthe appropriate utility company has beennotified. 3.2 SitePreparation Following submittal ofthe letter estimating property damages. andpriorto commencement of well-closure activities, the well sites will beprepared for closure. Required sitepreparation activities vary by location, and are summarized in Table 2. Table2. SitePreparation Requirements Well ID SitePreparation Activities Well 395A e Remove rooffromwell pitto provide access. 0 Disconnectwiring fromwell pump. 9 Shutdown power tolineoverthe well (residents may betemporadly relocated tohotels) 0 The ownerwill clean allofthedebris outofthevaultpriortothe sitework. Well 914A * Disconnectwiring fromwellpump. 0 Removesmall cottonwood tree adjacent towell Well 985A e Disconnect wiring from well pump Well 299A e Disconnectwiring fromwell pump * Excavate an area around the well-head casing. 0 Remove four bump posts in the area (cut at ground level) 0 Ownerwill remove building supply materials from vicinity ofthe well 0 Owner will relocate the "break area" forworkers at Hugh M Woods to an area outside exclusion zone Well 1070A e Disconnect wiring from well pump 0 Remove rooffrom well pitto provide access. * Protect 2" copper water line or reroute around the well pit. a Possibly need to trim branches from a neighbor's tree. Well 37304 9 No site preparation required Well 37319 * No site preparation required 3.2.1 Well Preparation Following preparation ofthe areas surrounding the wells. each well will need to be prepared for abandonment. This work will include:

" Opening/excavation ofsumps and vaults. as required. " Disconnection ofNAiring from the well pumps by a licensed electrician.

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" Removal ofpumps and related equipment from the wells " Removal ofstick-up and surface casings.
These activities will allow access to the wells for subsequent video-camera logging and well closure.
3.3 Video Logging
In order to evaluate the construction and condition ofthe five off-post water supply wells, downhole video camera surveys will be performed. These surveys will be performed prior to well closure, including the wells with known construction. This is to provide documentation and verification ofwell construction prior to closure. Video surveys will notbe required forthe two monitoring wells Q7304 and 373 19) because well construction has been documented, and they '11

be abandoned by backfilling/plugging.
3.3.1 WellPreparation
In order for downhole video logging to be effective, water within the wells must be relatively clear. In actively pumping wells. water will tend to contain suspended sediments that may limit visibility with a downhole camera. Because the wells scheduled for closure have not recently been in use. we anticipate thatthe water will be clear enough for video logging. However, ifthe water is initially too cloudy for video logging. we may inject potable water into the well with a hose. The well will then be allowed to stand undisturbed for 24 -48 hours until the water settles, and video logging will again be performed.
3.3.2 LoggingMethodsandProcedures
Because ofthe requirement for clarity in the water column, wells will be logged downward (i.e., from surface to bottom). In this waý. sediments will not be disturbed priorto logging. Ifwater clarity is not sufficient for evaluation ofwell construction using the downhole video tool, the COR will be notified and alternatives evaluated. Alternatives may include use ofadditional

rm102/9802/text doc/8/14/98 5 DRAFTTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT borehole tools (such as cement-bond logs. collar locators, andresistivity logs) or abandonment of thewell(s) by casingremoval.
Two different downhole cameras may be used; one 6" diameter toolwith side-view capabilities. and one2" diametertool with a downward looking wide-angle lens. Both downhole video cameras have self-contained light sources. The downhole video tools will be connected to a video recorder and a spool that automatically records depth in theborehole. A marker on the instrument cable willbe usedto evaluate theprecision ofdepth measurements. The marker will be aligned with a specific pointon the casing and depth recorded as zero. When the tool is returned to the surface. the alignment ofthismark to the point on thecasing will be compared with the automated depth reading whenthe video tool is returned to the surface. Requirements formeasurement precision are described in Section Il ofthisdocument (Quality Assurance Project Plan). In addition to water clarity. the downhole video-logging tool will require unrestricted access to the entire well (surface through screened interval). Ifthe well casing iscompromised (i.e., bent or constricted) such that the borehole video tool can not access the entire well depth. this information will be provided to the COR. and alternate well closure methods (up to and including casing removal) x),ill be evaluated. 3.3.3 DocumentationandReporting Measurement locations. depths. and other pertinent information will be recorded by the Field Team Leader in afield logbook. Video records will be recorded on VCRtapes. and copies ofthe tapes will be submitted to the COR. An-, deviations fromthis Work Plan will be noted and reported to the COR. Situations that impede the ability to effectively log any well will be reported to the COR. and revised approaches for logging and/or well closure will be evaluated.

rml02/9802/text doc/8/14/98 6 DRAFTTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT 3.3.4 Decontamination The downhole video tools, cables, and any other equipment that comes into contact withwater in the wells will be decontaminated atthe RMA on-post CERCLA decontamination facility priorto deployment to the nextwell. Priorto leaving thewell site, visible dirt and other materials will be removed with a brush. The equipment will then berinsed atthe decontamination station priorto entry into the decontamination line. Decontamination will conform to existing RMA-RVO plans andprocedures. 3.4 Well Closure The following sections describe well-closure procedures anticipated to complete the SOW. Two wells (37304 and 37319) will be abandoned by backfilling/plugging. Under this Work Plan, we assume that the remaining five wells will be closed using theperforation/grouting method. However. this closure method maybe contingent upon our ability to document well construction usino the do,ýý,nhole video tools. Ifwell construction can notbe determined, other methods, up to and including casing removal. will be evaluated. In this event, the COR will be notified and v,ell-closure will be delaved until a decision is reached on the closure method. At thistime. the Work Plan "ill be revised toreflect the ne,,N closure method and related equipment and procedures. 3.4.1 EquipmentandProcedures Wells 37304 and 37319 will be abandoned bv backfiIlin-/pIugging from total depth tothe surface. They will be backfilled with a mixture ofportland cement. bentonite. and water. Grout will be emplaced from the bottom up using a grout pump and tremie pipe. The amount ofgrout placed inthe well will be compared with calculated borehole volume to ensure thatno void spaces are present. Closure ofthe remaininQ five wells will include casing perforation and grouting. Perforation will be performed using a Holte Star-Wheel Perforator. This tool can perforate casings from 4"

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to 12" in diameter, and is powered pneumatically (by pressurized air). This tool is deployed down the well, activated, and pulled upward through the well casing. It creates 0.1"perforations at a density of 10perforations per foot around the circumference ofthe casing. Where casing diameter increases, the tool will be adjusted as required to ensure perforation ofthe entire well casing. The casings willbe perforated from the top ofthe screened interval to the surface. Sealing offofthe contaminated alluvial aquifer from the underlying Arapahoe Formation will then be accomplished by placing clean sand across the screened interval, and grouting the entire length ofthe well casing. This methods exceed the requirements ofthe Colorado Water Well Rules which only require casing perforation and grouting across a minimum of20 feet at the confining layer boundary. Following perforation, the well will be grouted from total-depth to the surface. The grout will be composed ofa mixture ofportland cement, bentonite, and water. Quantities and ratios ofthese constituents will be recorded in both a field logbook and on well closure forms. Grout will be pumped into the well using an injection pump and tremie pipe. When the well is completely grouted. the volume ofgrout will be compared with the calculated casiniz volume to ensure that no void spaces are present. Casing-volume calculation methods and the acceptable difference between grout volume and calculated borehole volume are presented in Section Il (QAPP).
3.4.2 Documentation
Information will be recorded b-N, the Field Team Leader on both well abandonment forms and in the field locybook. This will include. but not be limited to site location, date, depth-to-water. well construction information. grout composition. calculated borehole volumes, and volume ofgrout placed in the wells. All field notes and forms will be reviewed by the Technical Lead prior to submittal to the COR. Examples ofwell abandonment records. and a State ofColorado well closure form are presented in Appendix A.

rmI02/9802/text doc/8/14/98 8 DRAFTTHELATAIARCADIS GEPAGH7Y & MILLER TEAM DRAFT 3.4.3 Decontamination Tremie pipes, perforating tools. trucks, drill rigs, and any other equipment that comes into contact with water in the wells will be decontaminated atthe RMA on-post CERCLA Wastewater Treatment Plant/Decontamination Facility priorto deployment to the nextwell. Prior to leaving the well site, visible dirtand other materials will be removed with abrush. The equipment will then be rinsed atthe CERCLA decontamination station at RMAprior to entry into the decontamination line. Decontamination will conform to existing RMA-RVO plans and procedures. 3.5 DrillingPlan forReplacementWells Replacement wells will be constructed forabandoned wells 1070A and 914 A in accordance with the requirements ofthe SOW. Construction materials. methods, and documentation will be in compliance NYith Colorado Water Well Rules (WWR). These wells will be constructed in a manner that ensures no conduit exists for contaminants to migrate from the alluvial to confined aquifer. The replacement wells will be used bythe property owners for irrigation. Prior to drilling the replacement wells. required pennits will be obtained fromthe Colorado State Enuineer's Office. Wellsxkill be constructed in accordance with the requirements ofthe Colorado Water Well Construction Rules (2 CCR 402-2). 3.5.1 EquipmentandProcedures The replacement wells will be drilled in locations accessible to drill rigs, and agreed upon by the property owners. The replacement Aells %kill be a sufficient distance from the closedwells to ensure that theboreholes do not intersect and no grout contamination extends from the abandonedwell to the replacement well. Ifpossible. the replacement výells will be drilled using the air-rotar method. However. ifloose materials cause the borehole to collapse during drilling. mud-rotary may be used to maintain an open borehole. In this event. drilling mud will be contained. collected. and disposed at RMA per

rm1 02/9802/text doc/8/14/98 9 DRAFTTHELATA/ARCADIS GERAGHTY & MILLER TEAM DRAFT the Waste Management and Disposal Plan (Section III). Logging oftheborehole willbe performed on thecuttings returned to the surface during drilling. Theborehole diameter willbe 8", with a6" steel surface casing advanced from the surface to the top ofthe confining unit (Arapahoe). The contaminated alluvial aquifer willbe sealed offfrom the confined aquifer in the replacement wells by use ofawatertight, steel surface casing that will extendto the alluvium/confining layer (Arapahoe) interface. The steel casing will be grouted in place from the base ofthecasing up using apositive displacement method through atremiepipe, as required by the Colorado Water Well Rules. Beneath this,the well will be constructed with a 4" schedule 40 PVC casing inside the 6"borehole. Tothe extent possible, the replacement wells will be completed at the same depth and screened interval as the abandoned wells they are replacing. Well screens will be 0.03 )2" slotted PVC, andthe sandpack around the screen will be composed ofColorado Silica Sand, Inc. (CSSI) 10-20 sand. Well development willbe perfon-ned using a surge-block to flush fine-grained sediments out ofthe screen followed by bailinQ to remove these materials from the well Finally. a submersible pump will be usedto pump the well until the extracted water is clear. 3.5.2 Documentation Replacement well construction will be documented in the field logbook and on field forms. Well construction diagrams will be prepared showing casing and borehole diameters, depths, screened inten,al. gravel pack. seal. and grout locations. Well construction diagrams will be reviewed and the final design approved by the Technical Lead (Certified Professional Geologist). Original field forms. loobooks. and diagrams will be delivered to the COR. 3.5.3 Decontamination Tremle pipes. perforating tools. trucks. drill rias. and any otherequipment that comes into contact NA-ith water inthe wells will be decontaminated atthe RMA on-post CERCLA decontamination facilitN priorto deployment to the next well. Prior to leaving the well site. visible dirt and othermaterials will be removed with a brush. The equipment will then be rinsed

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atthe CERCLA Wastewater Treatment Plant/Decontamination Facility priorto entry into the decontamination line. Decontamination will conform toexisting RMA-RVO plans and procedures. 3.6 SiteRepairlRestoration Following well abandonment and construction ofreplacement wells, site repairs will be made to returnthe work sites as close as possible to their original condition. Original conditions willbe determined from site photographs and field notes taken priorto well abandonment and construction. Ifheavy equipment creates cracks inconcrete driveways, the damaged driveway section will be replaced. Walls ofwell vaults will be cut offat approximately Iftbelow ground surface, and the vaults will be backfilled/plugged with clean fill material to the original surface grade. All excavations at the well sites will bereturned to original grade. Damages to anybuildings, structures. or fences. although not anticipated. will be repaired. Insulating materials covering powerlines will be removed, and all rubbish and/or debris will be removed from the site for appropriate disposal atRMA. as described in the Waste Management and Disposal Plan (Section 111). Following site repairs/restoration. final conditions at the well sites will be documented with photographs and detailed field notes. Any issues or concerns raised by residents will be communicated to the COR so that he can provide guidance on any additional site repair/restoration activities.

rm1 02/9802/text doc/8/14/98 DRAFTTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT 11.QUALITY ASSURANCE PROJECTPLAN 1.0 Background This Quality Assurance Project Plan (QAPP) hasbeen prepared tomeetthe requirements ofthe project Statement ofWork (SOW) (WBS 1.000. 100.110.114) and the requirements ofSection C.6.1.7 ofthe RMA Technical Support Contract SOW. Inaccordance with these requirements, this QAPP provides specific procedures andprotocols to achieve quality assurance objectives of the Off-Post Well Closure project. Because no sampling, chemical analysis, or detailed hydrologic studies will be performed. detailed discussions ofprecision. accuracy, representativeness. completeness. and comparability (PARCC parameters) are notincluded in this document. However, abriefdiscussion ofmeasurement QA/QC is included in Section -3 ).0. 2.0 Review and Oversight RevieNN and oversight offield activities forthe Off-Post Well Closure project will include review and approval ofproject documents by a Certified Professional Geologist (CPG), and informal field audits. 2.1 CPG Review andApproval Per requirements ofthe SOW. the LATA/AG&M Team has designated aproject Technical Lead/CPG to revieN&-and approve project documents. The Technical Lead/CPG has overall responsibility fortechnical aspects ofthe program. He will be available to attend biweekly project meetings. and will guide technical xNork performed by the Team. He will review and approve the following project documents priorto final submittal to the COR: " Well abandonment forms " Well completion forms (neA wells) " Well construction diagrams (all Neils) " Measurement data and calculations

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The Technical Lead/CPG will report any identified deficiencies andrecommended corrective actionsto the COR. 2.2 InformalAudits During performance offield work, informal audits will beperiodically conducted by the Technical Lead/CPG and theTask-Order Manager. The purpose ofthe audits will be to evaluate compliance with the requirements ofthis Field Work Plan and the project Health and Safety Plan (HASP). Any deficiencies noted will be reported to theCOR, along with recommended corrective actions. Informal audits will be performed bythe LATA/AG&M Team atafrequency ofat least once perweek. Particular attention will be paidto health and safety issues, and technical requirements for ensuring contaminants do not spread from the alluvial to confined aquifers. Following each inforinal audit.results will be immediately reported to the COR verbally. followed by a brief(1-3 pg.) memorandum provided to the CORwithin 48 hours noting any deficiencies and corrective actions taken. 3.0 Quality Assurance/Quality Control (QA/QC) of Measurements The Off-Post Well Closure project does not involve sampling and chemical analysis and, therefore. few measurements will be taken. Hoxkever. QA/QC for measurement data are briefly discussed below. Water-Level Measurements Water level measurements will be made %N ith a calibrated well sounder to the nearest 0.1ft. This instrument contains a calibrated line "ith a water interface probe that sounds an alarm upon contact with water. Each water-level measurement will be made twice so that measurement precision can be calculated bN:

rm102/9802/text docJ8/14/98 DRAFTTHELATAIARCADIS GERAGHTY& MILLERTEAM DRAFT X, RPD X1 -2- (100) (Xi + X,) /2 Where: RPD = Relative percent difference 

### X,IX2 = Value ofmeasurements I and 2 Acceptable measurement precision will be +/- 5%.
Downhole Video Depth Measurements
The downhole video tools will be connected to a video recorder and a spool that automatically records depth in the borehole. A marker on the instrument cable willbe used to evaluate the precision ofdepth measurements. The marker will be aligned with a specific point on the casing and depth recorded as zero. When the tool is returned to the surface, the alignment ofthis mark to the point on the casing willbe measured to the nearest 0.1ft and compared withthe automated depth reading when the video tool is returned to the surface. RPD will be calculated for the two measurements. based upon the equation shown in the previous section (Water-Level Measurements). The acceptable measurement precision will be +/- 5%.
Grout Mixture Measurements
Grout used forwell closure and construction ofnew wells will be composed ofa mixture of bentonite. portland cement. and water. Portland cement and 2% bentonite will be measured to the nearest 0.5 pound. Water ,vill be measured to the nearest 0.2 gallon. Following mixing, densitv ofthe Prout will be calculated bv weichino a measured volume (nearest 0.2 gallons. to the nearest 0.25 lbs.). Densivy ofthe grout and mixingratios will be recorded on the well abandonment field forms. Grout densitv will conform to State ofColorado requirements for well abandonment.

rm1 02/9802/text doc/8/14/98 14 DRAFTTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT GroutVolume Volume of routplaced in abandoned wells will becompared with the calculated casing volume. Because the casing willbe perforated priorto emplacement ofgrout, the emplaced volume should exceed the calculated casing volume. The equation for calculating casing volume is as follows:

n 1 2h,

ton Where: r casing radius length ofcasing with a given diameter n number ofcasing lengths with different diameters The difference between the calculated and measured volumes will be based upon the following equation:
PD = V1 (100) V, Where: PD = percent difference VI= volume emplaced V2 = calculated borehole volume. The percent difference bet,.keen measured grout volume and calculated borehole volume must be ý:90%. There isno upper bound to thisvalue because the amount ofgrout entering the well annulus and formation can not be accurately estimated. and proper closure is ensured regardless ofthe magnitude ofthisvalue (i.e.. amount over 90%).

rmI0219802/text doc/8114198 15 DRAFTTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT Well Depths Depths ofboreholes, wells. and construction materials in the wells will be measured to the nearest 0.2 ft. The reference point forthese measurements willbe a fixed point on the surface (i.e., in surface casing). For existing wells that will be closed, surface elevations are typically surveyed to the nearest 0.01 ft. and well construction details will be reported as elevations. New wells will be referenced to a fixed point on the surface casing, and will be measured as depth from surface as opposed to elevation.
4.0 Documentation
The project objective is to prevent downward migration ofcontaminants in the alluvial flow system to the underlying regional confined flow system via well borings by closing specific wells located outside ofthe RMA boundary. To meet this objective, the following data will be collected:
" Utilitv clearances and Tri-Country Health Department (TCHD) approvals/notifications for each private property parcel. " Site analysis and estimate ofabandonment impact to property, " Photographic documentation ofwell closure area's original condition. closure procedures, and post closure condition. " Well construction information. including camera logs, " Field notebooks: " Well Data Sheets. " Records ofvolumes. containers. and contents ofwaste to be disposed; " Permit application.ý for new xAells: and " Lithologic logs and construction details for two new replacement wells.

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Foreach parcel, the LATA/AG&M Team will obtain written information from the LNCC, along withmarked locations ofburied utilities atthe field sites. Estimate ofPropertv Damage Copies ofthe Field Team Leader's site analysis and memo tothe COR regarding property damage estimates will be maintained. Photographic Documentation The LATA/AG&M Team will document site conditions priorto, during, and after well abandonment by taking photographs and detailed field notes. Photographs will include landscape features (i.e., lawns. trees. and shrubs). condition ofdriveways, and any other features that may potentially be damaged during site work. Photographs provide the most accurate record ofthe field worker's observations. The), can be significant during future inspections, informal meetings. and hearings. and may be compared with conditions following well abandonment to ascertain the extent ofany property damages. Photographs mustbe documented to be avalid representation ofan existing situation. Each photograph will be recorded in the Field Team Leader's lo(ybook and labeled with the following items to document activities at each well closure area: " Date and time " Signature ofphotographer " Name and well number for site " Type ofcamera. lens. film. and other equipment used (logbook only) " General direction faced and description ofsubject " Distance from photographer to object " Sequential number ofphotograph and roll number

rml02/9802/text doct8/14/98 17 DRAFTTHE LATA/ARCADIS GERAG14TY & MILLER TEAM DRAFT Video camera logs will also be maintained and used to record construction details ofthe wells to be abandoned. The date. time. and depth belowtop ofcasing will automatically be logged oncamera. Before lowering the camera into the well, site workers will record the type ofcamera and other equipment used, as well as thename ofthe camera operator. Collection ofvideo logs will also be noted in the FieldTeam Leader's field logbook. Well Data Sheets Well construction information other than camera logs will be recorded on well data sheets. including original well casing and borehole depths and diameters, top ofcasing and ground surface. material ofconstruction. screened section length, diameter, and location below ground surface. depth to water. and type ofscreen (construction and slot width). Tv.-o types ofwell data sheets are required for thisproject. RNIA well abandonment record sheets and State ofColorado well closure forms #GWS-9 (Examples presented in Appendix A). RMA sheets require closure information such as perforation method and depth and sealing methods and materials. Both ofthese forms completed for each abandoned well will be submitted to the COR within 24 hours ofclosure or by the next business day and to State Enunneer's Office by the project completion date. Field Loilbooks All information related to field actwities xNill be recorded in a bound loebook with consecutiveIN -numbered paoes. This loubook výill be maintained by theField Team Leader or hisdesianate. Ifnot included on specific data collection forms such as well construction diaarams. entries inthe loubook should include at least the information listed below: " Date and time ofentry: " Name and address offield contact: " Site identification (including .ýell number): " Description ofabandonment or drilling processes:
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" During drilling. a lithology description with depth interval (from cuttings); " Field observations ofthework area, including a sketch; " Field measurements such as camera depth or grout mixing ratios and masses; " Deviations from the work plan or noted anomalies, such as differences in well construction details; and " Any uncompleted work. Logbook maintenance will be assigned to a single individual and records oflogbook numbers kept when more than one logbook is used. Ifany person otherthan the Field Team Leader or designate makes an entry. he/she will sign and date the entry. Logbook pages will not be removed. Ifa mistake is made, the author will denote itby drawing a single line through the mistake. writing the new information above the line. and initialing and dating the change. The loubook must be siened at the end ofeach day.
Lou forNe,.N Wells Replacement well construction m, ill be documented in the field logbook and on field forms. Well construction diagrams will be prepared sho,.ýing,casing and borehole diameters. depths. screened interval. gravel pack. seal. and grout locations. Formation lithology will also be logged in the driller's loabook. Well construction diagrams xvill be reviewed and the final design approved by the Technical Lead (Certified Professional Geologist). Original field forms. logbooks. and diaszrams xvill be delivered to the COR. The required Well Construction and Test Report will be delivered to the Colorado State En&,Ineer*s Office b-,,- the close ofthe project.

rm102/9802/text doc./8/14/98 19 DRAFTTHELATAIARCADIS GERAGH7Y& MILLER TEAM DRAFT 

### III. WASTE MANAGEMENT AND DISPOSAL PLAN All wastes generated during well abandonment andconstruction activities are considered nonhazardous. as documented by previous water sampling and analytical results. We anticipate three types ofwaste generated inthis effort: 1. Concrete waste and debris -disposed ofat RMA 2. Steel and PVC -disposed ofatRMA (steelwill berecycled. ifpossible) 3. Containerized wastes (cuttings. fluids. drilling mud, etc.) -Disposedofat RMA These waste streams willbe segregated as generated at the well sites. Wastes will thenbe transported to RMA by the LATA/AG&M Team fordisposal orrecycling atthe appropriate facilities. in accordance with applicable RMA plans andprocedures.

rm1 02/9802/text doc/8/14/98 

### 20 DRAFTTHELATAIARCADIS GERAGHTY& MILLER TEAM DRAFT



## Appendix A Example RMA and State of Colorado Well Closure Forms

rm102/9802/text doc/B/14/98 21 DRAFTF 0 R M STATE OF COLORADO Fof Office Use only NO. OFFICE OF THE STATE ENGINEER Gws-9 818 Centennial Bldg.. 1313 Sherman St., Denver, Colorado 80203 12f95 (3031806-35131 TYPE OR PRINT IN BLACK INK 

### WELL ABANDONMENT REPORT (To Report Plugging and Sealing Wells) PERMIT NUMBER OF PLUGGED WELL 1. INDIVIDUAL/COMPANY RESPONSIBLE FOR PLUGGING NAME(S) Mailing Address City, St. Zip Phone (-) 2. ACTUAL WELL LOCATION: COUNTY PROPERTY ADDRESS (Addrcr_-) (City) (State) (Zip)

- 1/4 1/4, Sec. Twp. ON. [IS., Range E. W P.M. ,es from Section Lines Ft. from 1:1 N. S. Line, Ft. fromE E. or Distanr OW.Line. 3. 1(we), report that an existing well was plugged and seated for the following reason(s): 

# F] The well was plugged and sealed as required under the conditions of approval of Well Permit No. [__j '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 '19 5. The well was plugged with the following materials placedat the indicated intervals: AMOUNT AND TYPE OF MATERIAL METHOD OF PLACEMENT INTERVAL from feet to feet from feet to feet from feet to
- feet from feet to -feet INTERVALS OF CASING RFMOVED/RIPPED INFEET from teet to feet ýrom 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) knowledoe. I[Pursuant to Section 24-4-104 (13)(a) C.R.S., themaldrig offalse statements herein constitutespedurN In the second degree and is punishable a3 a class 1 misdemeanor.) Name/T-rtle (Please tvpe or print) I Sipriature I Dot

-IMF-ORMATION- It isthe responsibility of the well owner to have the well properly plugged and sealed. The Well

Construction Contractor is responsible for notrtying the well owner of the plugginq and sealing requirement. This form may be reproduced by photocopy or word processino means.REIVIEDIATION VF-NTURE OFFICE 

## Well Closure Well No... 36061 Project CANU/ Basin A Well Abandonment Page of 2 Site Lo.cation: Ro,ky Mountain Arsenal, Basin A, Section 36 Date Started- 6-16-98 Date Completed: 6-19-98 Surveyed Surveyed Location N Elevation GS* 181251 5258 2185212 E TOC' 52,60.93 Depth of Water (TOCIfOate 21-71f/2-18-98 Casing Depth (GS): 114.6 Drilling Layne - Western Rig lng-ersol Rand TH60 Prepared By: Dallas Werner zda,-ý Date 6-25-98 Well Conraruction HistQry Original Depth Original Bore of Well ft. Depth ft. (GS) 114.6 114.6 Diameter (in.) Too (ft.) Bonom (ft.)6oreholleCasing-#1: PVC 2 0 100.1 Casing #2: Screen 91: PVC 2 100.1 107.3 -Cornments: Umiude c=ýWý Grwat4cl" "Ibme ZACwo P.C. if gxo"rm Closure, Drilling Log Di,-pth Closure Boring Drilled (ft.) 115' Diameter Closure Boring On.i 8" to 43'. 6.75" from 43-115'
-D rilling Method 8" odex and 6.75" a-I'r rotary tricone Oeoth of.Water (GS) 21. 7.1' Date 2-18-98 .Sample Taken? Not Applicable SampleVolume 'Not Applicable Geophysical Lový 114one Geophysical Contractor Xor, Applien'bIr Perforation Method Vor- Applicable 'Perforation Depth (GS) Not Applicable *GS - Ground Surface **TOC = Top Of CasingREMEDIATION VENTURE OFFICE 

## Well Closure Well Nlo. 36061 Project CAMU I Basin A Well Abandonment Page 2 of 2 Casiýq Rg-,moval Drilled? Foot!ýQe Ptilled7 Footagg Protective Casing, Not: Applicable Casing #1: Not Applicable Casing #2: Not: Applicable Screen #1: Not ApplicableSCreen or Casing Left lzcre!2r; or Diameter Matedil T!2o gf bottorn Qf

Casing find or Type JfLi Interval #1: Not Applicable Interval #2.- Not Applicable Interval #3: Nar- Applicable Interval #4: Not ApplIcable Sealing St)ecifics Mdthod of Sealing Grout Pump and Tremi-e Pipe Depth Tremie Pipe Placed ft. (GS) 1131 Of I" Steel Pipe Slap Til- -$.andI RII fInTervall Seal #1 fintervan Soal #2 (Interval) Matefial: Holnam Portland Type 1-11, 94P bags 0-115'

Sentonite 2Z - 1.88# per bag of Portland ýGal. %ý/ater/Bag 8-'5 Gallons per bag of Potlana -with 2% :Rýnranitp (or Est. Grout Density) 14.5f/gallcyn Comments: Material used:

Zentonite Powder 78.96# Water - 357 gs!llons

coarse gravel from- 50-115' - water @ Z5' -when Zrouting (.original backfiU Materlal)