drilling plan - geohydrologic drilling program, locations ...drilling plan sunrise mountain landfill...

SFUND RECORDS CTR

2066425

DRILLING PLAN

Sunrise Mountain Landfill

IGeohydrologic Drilling Program

Locations 7,13, and 15

Prepared on behalf of:

I

m Republic Services

| of Southern Nevada

I• Prepared by:

I SCS ENGINEERS

• 2702 North 44th Street, Suite 105B

Phoenix, Arizona 85008

• (602) 840-2596

• July 10,2001

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TABLE OF CONTENTS

TABLE OF CONTENTS

LIST OF TABLES

INTRODUCTION AND PURPOSE

SECTION 1 Project Management and Communication

1.1 THE PROJECT TEAM

1.2 PROJECT MEETINGS

1.2.1 Implementation Meeting

1.2.2 Daily Briefing

1.2.3 Weekly Meetings/Teleconferences

1.2.4 Progress Meetings

1.3 PROGRESS REPORTS

1.3.1 Daily Field Logs

1.3.2 Progress Reports

1.4 VARIANCE PROCEDURES

SECTION 2 LOCATION 13

2.1 HISTORY AND BACKGROUND

2.2 DRILLING PLAN FOR LOCATION 13

2.2.1 Summary of Proposed Drilling Plan for Location 13.

2.2.2 Discussion of Plan

2.3 WELL INSTALLATION


3 1 HISTORY AND BACKGROUND


3.2.1 Summary of Proposed Drilling Plan for Location 7 ...






4.2.1 Summary of Proposed Drilling Plan for Location 15.


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• 4.3 WELL INSTALLATION

• LIST OF TABLES

1 TABLE 1: STAFF

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July 2001 ©2001, SCS Engineers

INTRODUCTION AND PURPOSE

Drilling activities were initiated at locations 7, 13, and 15 at the Sunrise Mountain Landfill(Site) during the 2000 calendar year. This work was to be conducted in accordance with theSite Sampling and Analysis Plan, as contained in the USEPA-approved Work Plan datedFebruary 29, 2000. Technical difficulties were encountered during the course of work atlocations 7B, 13A, 13B, and ISA and these boreholes were abandoned. A letter from USEPAdated June 18, 2001 indicated that abandoning these boreholes (7A, 13A, and ISA) was adeviation from the Work Plan and that the boreholes must be re-drilled and new wellsinstalled at these locations. Technical issues were also indicated concerning drillingprocedures at location 13B.

SCS Engineers (SCS) has been engaged by Republic Services of Southern Nevada (RSSN) toassist in the implementation of appropriate drilling, sampling, and well installation proceduresaccording to the previously approved Work Plan at locations 7, 13, and 15 during the summerof 2001. The scope of SCS' work is to provide project management and technical assistanceto ensure this work is completed, and new wells installed in accordance with the previouslyapproved Work Plan and subsequent revisions and technical memorandums currently in effectincluding Geotechnical Environmental Services' June 19, 2001, revised Work Plan. The termWork Plan as used herein means the previously approved Work Plan and subsequent revisionsand technical memorandums currently in effect.

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July 2001 © 2001, SCS Engineers

SECTION 1 PROJECT MANAGEMENT AND COMMUNICATION

SCS recognizes the importance of diligent technical and administrative management of thiswork, and has therefore committed the necessary resources the carry out the work in anefficient and professional manor. SCS will pay particular attention to communication issues,not only between our project team, but also among other stakeholders including Clark County,Bureau of Land Management (BLM), and United States Environmental Protection Agency(USEPA) and their oversight contractor (SAIC).

1.1 THE PROJECT TEAM

Table 1 shows SCS' Key Personnel and Contractors assigned to this project.

Table 1: Project Team

Project Director

Technical Project Manager

Field Project Manager

QA/QC Manager

Field Geologist

Drilling Contractor

Geophysical Logging Contractor

Contract Laboratory

Stephen Smith

Mark Varljen

Derek Reeve

Stephen Smith

Ed Carlton

Layne

COLOG

NEL

1.2 PROJECT MEETINGS

1.2.1 Implementation Meeting

SCS will start overseeing the current drilling activities on Monday, July 9, 2001. An initialmeeting of the Project Team will be held on July 9, 2001 to discuss current and future drillingactivities at the Site.

An implementation meeting, attended by all team members, will be conducted once thisDrilling Plan is approved by the USEPA. The implementation meeting will open lines ofcommunication and familiarize all project team members with site issues, expectations,project processes and procedures.

1.2.2 Daily Briefing

The Field Project Manager, the Field Geologist, and the Drilling Contractor will assemblebriefly every day after the day's work to summarize the progress, highlight any difficulties orsafety issues, and set objectives for the upcoming day's work. The day's activity and boringlogs will be submitted to the Field Project Manager, who will compile this information, andbe responsible for submittal of daily field logs.

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1.2.3 Weekly Meetings/Teleconferences

The Field Project Manager, the Field Geologist, QA/QC Manager, and Technical ProjectManager will hold a teleconference weekly to review geologic logs, assess progress, resolvetechnical issues, and update the schedule, as necessary. Decisions to plug-off particular zonesor proceed with well construction, or to initiate a Variance Request (as discussed in section1.4) will be specifically addressed during these meetings. The drilling and geophysicallogging contractor may participate in these meetings, as necessary.

After the weekly teleconference, the Field Geologist will update the boring tracking log. Theboring tracking log is a spreadsheet data base system, and an example of its content ispresented in Attachment A. SCS will add additional data to the boring tracking log, forexample, when an elog was performed along with the date and footage. Additionalsuggestions for data inclusion on the boring tracking log from the stakeholders are welcome.

1.2.4 Progress Meetings

The Project Director, Technical Project Manager, Field Project Manager, and Field Geologistwill meet on-site, as needed, to resolve any "big picture" issues, brief interested stakeholderson project progress and issues, and obtain stakeholder input as necessary. The drilling andgeophysical logging contractor may participate in these meetings, as necessary.

1.3 PROGRESS REPORTS

1.3.1 Daily Field Logs

Daily written logs will be completed by field staff and submitted to the Field Project Managerat the completion of each day. The Field Project Manager will compile the daily logs andtransmit them to the Technical Project Manager, RSSN, USEPA and/or their designee forreview by the following business day.

1.3.2 Progress Reports

At least once per month, an updated boring tracking log will be emailed to interestedstakeholders.

1.4 VARIANCE PROCEDURES

If site conditions or other circumstances indicate that it may be desirable to deviate from theWork Plan, EPA will be notified. This notification, approval, or modification will bedocumented. This documentation will include the circumstances leading to the request,details of the proposed change, reason for the change, and approvals or modifications to therequest.

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The first boring (GH-13A) at this location was started on June 29, 2000. GH-13A has thefollowing coordinates and elevation: Northing 11,466.38; Easting 10,166.27; and 1,877.61Elev. On June 29, 2000, GH-13A was advanced from 0 to 149 feet below ground surface(bgs) (1,877.61 to 1,728.6 Elev). On June 30,2000, GH-13A was advanced from 149 to 184feet bgs (1,728.6 to 1,693.6 Elev). At this elevation, apparently water was encountered in theboring. Mr. Hakkila performed the logging on June 29 and 30, 2000. Mr. Martin re-loggedthe 0 to 184 feet bgs on February 27, 2001 based on review of cores in storage.

On July 5, 2000 (6:25 a.m.), the water level in GH-13A was recorded at 181.56 feet bgs(1,696.05 Elev). On July 7, 2000, a water sample was obtained from the borehole. A reviewof the analytical data from the July 7, 2000 water sample indicated that several metals(chromium reported at 0.017 mg/L) and anions were detected and that for all the organiccompounds analyzed, acetone had the only detection (reported at 0.034 mg/L). Constituentsanalyzed in this sample were below their corresponding MCL's (NEL ID #L0007048 sampledJuly 7, 2000).

On August 8, 2000, borehole GH-13A was reamed out and a 14-inch casing was installed andcompleted on August 9, 2000 to a depth of 184.5 feet bgs (1,693.1 Elev).

On August 14, 2000, advancement of borehole GH-13A resumed through the 14-inch casingfrom 184 to 329 feet bgs (1,693.6 to 1,548.6 Elev). On August 15, 2000, borehole GH13Awas continued from 329 to 453 feet bgs (1,548.6 to 1,424.6 Elev). On August 16, 2000,borehole GH-13A was continued from 453 to 477 feet bgs (1,424.6 to 1,400.6 Elev). Mr.Cooke performed the logging on August 14, 15, and 16, 2000. The following water levelmeasurements were obtained from GH-13A after advancement to 477 bgs (1,400.6 Elev):

Time

UNKNOWN

8:30

7:55

7:20

14:20

6:20

6:30

10:10

10:45

Date

09/01/2000

09/13/2000

09/20/2000

09/25/2000

09/26/2000

09/27/2000

09/28/2000

10/02/2000

10/18/2000

Boring Depth,(ft) bgs

477

477

477

477

477

477

477

477

477

Water Level,(ft) bgs

293.40

292.42

272.52

255.42

251.40

249.80

305.50

258.45

240.0

Water Elevation,(ft)

1584.21

1585.19

1605.09

1622.19

1626.21

1627.81

1572.11

1619.16

1637.61

Note: Water was first reported in GH-13A at 184 feet bgs (1,693.6 Elev)



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On September 27, 2000, a water sample was obtained from borehole GH-13A from 8:00 to8:30 a.m. There was one sample, one duplicate, and one rinseate sample collected andanalyzed. A review of the analytical data from the September 27, 2000 water sampleindicated that several metals and anions were detected, and that there was no detection of anyanalyzed organic compounds. Chromium (dissolved) was reported as non-detect (NEL ID#L0009303, #L0009304, #L0009305 sampled September 27, 2000).

It has been reported that on September 27, 2000, the T4W drill rig was set up at GH-13A toapparently advance the boring. During the process of blowing out the water prior to drillingadvancement, a decision was made at approximately 14:30, or slightly later, not to advancethe boring. The T4W drill rig was removed from location 13.

On October 18, 2000, USEPA representatives were at the Site. They had requested thatgroundwater samples be taken from various locations so that they could observe monitoringprocedures and obtain a set of split samples. One borehole selected was GH-13A. A watersample was obtained from borehole GH-13A on October 18, 2000 and split with USEPArepresentatives. On October 18, 2000, a water level measurement taken in GH-13A indicateda water level at 240.0 feet bgs (1,637.61 Elev). A review of the analytical data from theOctober 18, 2000 water sample analyzed by NEL indicates that several metals (chromium,dissolved reported at 1.28 mg/L) and anions were detected, and that there was no detection ofany analyzed organic compounds (NEL ID #LOO 10235 sampled October 18, 2000). Asreported by NEL, the level of chromium appears to be above its MCL of 0.1 mg/L. Thereporting of this chromium value may be a laboratory error as no other water samplesperformed by NEL are in this range. For verification purposes, SCS would like to request thatthe USEPA review their records, and provide a copy of the results for the corresponding splitsample.

The second boring (GH-13B) at this location started on December 4, 2000. GH-13B has thefollowing coordinates and elevation: Northing 11,455.60; Easting 10,183.31; and 1,885.67Elev. On December 4, 2000, GH-13B was advanced from 0 to 159 feet bgs (1,885.67 to1,726.7 Elev). On December 5, 2000, GH-13B was advanced from 159 to 189 feet bgs(1,726.7 to 1,696.7 Elev).

On December 6, 2000, a water level measurement taken at 6:45 a.m. in GH-13B indicated awater level at 189.10 feet bgs (1,696.57 Elev). The logging Geologist reported about 6-inchesof water in the borehole on the log. On December 6, 2000, GH-13B was advanced from 189to 256 feet bgs (1,696.7 to 1,629.7 Elev). On December 7, 2000, GH-13B was advanced from256 to 269 feet bgs (1,629.7 to 1,616.7 Elev). On December 8, 2000 (Friday), GH-13B wasadvanced from 269 to 307 feet bgs (1,616.7 to 1,578.7 Elev). On December 11, 2000(Monday), GH-13B was advanced from 307 to 327 feet bgs (1,578.7 to 1,558.7 Elev). Thedrilling was discontinued at 13:50 on December 11, 2000. Mr. Jackson performed the loggingofGH-13B.

On December 11, 2000, a water sample was obtained from borehole GH-13B from 10:00 to10:15 a.m. On December 11, 2000, a water level measurement indicated the water level to beat 307 feet bgs (1,578.7 Elev). A review of the analytical data from the December 11, 2000water sample indicated that for all the organic compounds analyzed, acetone and 2-butanone


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had the only detections (0.380 mg/L and 0.058 mg/L, respectively; NEL ID #L0012109sampled December 11, 2000).


2.2.1 Summary of Proposed Drilling Plan for Location 13

Based on a review of available data, it is believed that at least two water zones exist atlocation 13 down to 1,400.6 Elev (about 480 bgs). The first waterbearing zone down fromthe surface (1,690 to 1,700 Elev; about 185bgs) will be evaluated for yield rate and MCLconstituents as provided for in the Work Plan. It is believed that this water zone is isolatedwithin the lithology and is probably seasonal in nature. Borehole GH-13C will be advancedto this approximate depth to evaluate the first water bearing zone. If the water yield rate ismore than the required amount or constituents are above MCL's, a monitoring well will becompleted in this water zone. If the water yield rate is less than the required amount and theconstituents are below MCL's, the water zone will be cased off and GH-13C will continuedown to the second water zone.

For the second water zone down from the surface (1, 615 to 1,625 Elev; about 260 bgs), thetop of the zone will be located, and yield rate and MCL constituents will be evaluated. If GH-13C is completed as a monitoring well in the first water bearing zone, GH-13D will bestarted, cased through the first water zone, and used to evaluate the yield rate and MCLconstituents at the top of the second water zone.

Once the data on the top of the second water zone is known, SCS proposes to continue tosample the lithology and drill to find a confining layer or to a maximum of 15-feet below firstencountered water (saturated zone). If a confining layer is found, procedures in the Workplan will be followed. If no confining layer is found within 15 feet, a yield rate will bedetermined, a water sample taken, and the borehole will be reamed and a casing will be set toa depth of 15-feet below the first reported water level (saturated zone) in the borehole. If nowater is found, the borehole will be continued through the set casing using procedures in theWork Plan. If water is found below the casing elevation, drilling will stop and the USEPAwill be contacted.

SCS believes that location 13, between approximately 1,625 and 1,400 Elev (255 to 480 bgs),and possibly deeper, consists of small-interbedded lenses of more permeable materials.Current drilling practices have proceeded too quickly through this zone trying to find the topor bottom of a confining layer. Air rotary drill rigs and percussion hammer drill rigs by theway they work, exert significant air pressure on these small-interbedded lenses, dry outcuttings, and seal off the side walls of the boring for water flow in these small channels. Asthe boreholes have deepened, excessive amounts of water pressure, weekend down times, andgravity have led to the boreholes filling up with water. In most cases, the water depth hascaused operational problems with the air rotary equipment making it useless and causingdrilling to cease.


SCS proposes to locate a new borehole, GH-13C, having the following approximatecoordinates: Northing 11,460; Easting 10,210. This will be approximately 30 feet east of GH-

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13B. The surface elevation will be measured at the location of GH-13C, recorded, and usedas a reference point.

It is proposed that the T4 drill rig currently being used at the Site be used to drill a pilotborehole at the GH-13C location. From the surface to 1,725 Elev (about 155 bgs), samplecuttings from the air rotary discharge will be observed by the Field Geologist, and comparedto lithology reported for boreholes GH-13A and GH-13B. If cutting samples indicate possibledeviation from the previously logged boreholes at location 13, as determined by the FieldGeologist, or if saturated conditions are unexpectedly encountered, advancement will stopimmediately and drive samples will be collected. Continuous core samples consisting of splitspoon samples as defined in the Work Plan will be used from 1,725 Elev (about 155 bgs) tothe depth water is detected. The pilot borehole will be advanced behind the continuous coresamples.

Based on review of the water elevation, first reported water, and the lithology of boreholesGH-13A and GH-13B, it is anticipated that the top of the first water bearing zone at location13 is going to occur between 1,690 and 1,700 Elev (about 185 bgs). This is subject to changeand verification during the drilling of GH-13C. It appears based on available data that thismay be a seasonal water zone. GH-13A had approximately 2.5 feet of water in this zone inlate June and early July of 2000. However, GH-13B had an inconsistent data point within thissimilar zone in the first half of December of 2000. The important thing is that as theanticipated top of the water zone is approached, the continuous core sample and drillingadvancement must be slowed down. Water level in the borehole should be checked after eachcore sample starting at 1,710 Elev (about 170 bgs) and downward until the top of the waterbearing zone is located or until 1,680 Elev (about 200 bgs) is reached in the borehole.

Once the top of the water zone is found or 1,680 Elev (about 200 bgs) is obtained, boreholeGH-13C should be advanced to the confining unit or 15-feet below first saturated zone. Ifwater is not found by 1,680 Elev (about 200 bgs), drilling will be stopped and USEPA will becontacted. Boring logs will be completed by the Field Geologist for borehole GH-13C.

For purposes of comparison and to provide a quality control check on previous data obtainedat location 13, SCS proposes to perform geophysical logging as defined in the Work Plan forthe pilot borehole at GH-13C. If the geophysical data compares favorably, no furthergeophysical logging will be performed on locations 13 or 7, except for advancement footagebelow current geophysical data. If it does not, geophysical data will be obtained until theissues are resolved. Since geophysical data was not obtained previously at location 15,geophysical logging will always be performed at this location.

If water is encountered in the anticipated zone, SCS proposes to determine the yield rate andobtain water samples for laboratory analysis. A bailer will be used to evacuate the boreholeand the recovery will be monitored. A yield rate will be calculated. The decision treeprocesses as defined in the Work Plan will be used to determine if a well is required to becompleted in this water zone.

If a well is required, a well completion diagram with supporting data will be faxed to theUSEPA for their review. The well will be installed, completed, developed and sampled asdefined in the Work Plan.

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Based on review of the water elevations, it is anticipated that the top of the second water zoneat location 13 is going to occur between 1,615 and 1,625 Elev (about 260 bgs). This issubject to change and verification during the drilling of the borehole. The important thing isthat as the anticipated top of aquifer elevation is approached, the continuous core sample anddrilling advancement must be slowed down. Water level in the borehole should be checkedafter each core sample starting at 1,635 Elev (about 245 bgs) and downward until the top ofthe aquifer is located.

Once the top of the aquifer elevation is established, the borehole will be advanced until aconfining layer is found or the borehole is a maximum of 15-feet below the first reportedwater elevation (saturated zone) in the borehole. If a confining layer is found, a casing will beset and the borehole will be continued in accordance with the procedures in the Work Plan.

If no confining layer is found, drilling advancement will be stopped at 15-feet below the firstreported water level (saturated zone) in the borehole. After the water elevation is obtained,the yield rate of the borehole will be determined. A bailer will be used to evacuate theborehole and the recovery will be monitored. A yield rate will be calculated. The boreholewill then be reamed and a casing will be set to a depth of 15-feet below the first reportedwater level (saturated zone) in the borehole. If no water s found, the borehole will becontinued through the set casing as per the Work Plan. If water is found in the core samplesor in the borehole, drilling will stop and the USEPA will be contacted.

If no water is found, the boring will be advanced to the next saturated zone. If no confiningunit is found within 15-feet of encountered water in the next zone, drilling will be stopped.Yield rates will be determined. If a monitoring well is needed, it will be installed with a 20-foot screen (15-feet below and 5-feet above first reported water/saturation zone). Otherwise,the water zone will be sealed off and drilling will continue using procedures in the Work Plan.


It is anticipated that GH-13C will be completed successfully and can be used to install MW-13C. It is unknown whether MW-13C will be completed in the upper water bearing zone andin that case, a GH-13D will be used after casing off the upper water zone to complete furtheradvancement or GH-13C will be used after casing off the upper water zone to completefurther advancement. In any event, the well(s) will be installed, completed, developed andsampled as defined in the Work Plan.

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The first boring (GH-7A) at this location was started on April 18, 2000 by Eagle Drilling.GH-7A has the following coordinates and elevation: Northing 15,558.12; Easting 12,333.05;and 2,014.39 Elev. Between April 18 and 20, 2000, borehole GH-7A was advanced from 0 to170 feet below ground surface (bgs) (2,014.39 to 1,844.4 Elev), using a hollow-stem auger.Advancement of borehole GH-7A was stopped on April 20, 2000. On May 24 and 25, 2000,the 170 feet that had been drilled in April 2000 was reamed. There appears to be noindication in the records that a casing was placed in the reamed borehole. On May 25, 2000,after the reaming was completed, the borehole was advanced from 170 to 185 feet bgs(1,844.4 to 1,829.4 Elev) using a percussion hammer drill rig. There appears to be noindication in the records that water was encountered in borehole GH-7A. Mr. Jonesperformed the logging on April 18, 19, and 20, 2000 and Mr. Rapoza performed the loggingon May 24 and 25, 2000.

On July 11, 2000, a second boring (GH-7B), approximately 20 feet northwest from the firstone, was started by Boart Longyear Drilling. GH-7B has the following coordinates andelevation: Northing 15,574.70; Easting 12,320.90; and 2,012.30 Elev. Between July 11 and18, 2000, the borehole was advanced using a sonic rig from 0 to 248 feet bgs (2,012.30 to1,764.3 Elev). At 248 feet bgs (1,764.3 Elev), it was reported that the soil became very stiffand moist. A water sample was taken on July 18, 2000. Drilling continued until noon on July19, 2000 with advancement to 253 feet bgs (1,759.3 Elev) at which time drilling stopped. Itwas noted in the field log that the outside of the core barrel was muddy between 248 and 250feet bgs (1,764.3 to 1,762.3 Elev). At 14:40 on July 19, 2000, a water level reading of 250.75feet bgs (1,761.55 Elev) was recorded. On July 20, 2000, a water level reading of 242.25 feetbgs (1,770.05 Elev) was recorded at 6:30 a.m., and a water sample was taken. A water levelreading was taken on July 21, 2000, and recorded as 249.00 feet bgs (1,763.30 Elev).

Drilling was resumed on GH-7B on July 25, 2000. Between July 25 and August 1, 2000, GH-7B was advanced from 253 to 421 feet bgs (1,759.3 to 1,591.30 Elev). On August 1, 2000, awater sample was obtained.

Drilling was resumed on August 14, 2000. Between August 14 and August 24, 2000, GH-7Bwas advanced from 421 to 590 feet bgs (1,591.3 to 1,422.3 Elev). A water sample was takenon August 25, 2000.

Drilling resumed on September 28, 2000 at 590 feet bgs (1,422.3 Elev). However, due to achange in drilling company, the logging of borehole GH-7B started at 597 feet bgs (1,415.3Elev). West Coast Hazmat was the driller and an air rotary rig was used. Between September28 and October 3, 2000, GH-7B was advanced from 590 to 645 feet bgs (1,422.3 to 1,367.3Elev). The total depth of this boring was 645 feet bgs (1,367.3 Elev). It was reported that theboring ended in a fractured Limestone formation when the drill became sand-locked. Sixdifferent geologists performed the logging of this borehole. One additional water sample wastaken on October 17, 2000. This sample was split with USEPA representatives.


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Between September 13 and October 2, 2000, several other water level readings were taken. Asummary of all water level measurements recorded at GH-7B is provided below. It can beseen by these results that a somewhat consistent water level was observed over the period forwhich readings were taken.

Time

14:40

6:30

UNKNOWN

9:40

11:16

10:32

6:20

6:45

Date

7/19/2000

7/20/2000

7/21/2000

9/13/2000

9/20/2000

9/26/2000

9/28/2000

10/2/2000

Boring Depth, (ft)bgs

253

253

253

590

590

590

590

640

Water Level, (ft)bgs

250.75

242.25

249.00

248.00

247.90

247.45

252.38

247.87


1761.55

1770.05

1763.30

1764.30

1764.40

1764.85

1759.92

1764.43

Note: Water was first reported in GH-7B at 248 feet bgs (1,764.3 Elev)



Based on a review of available data, it is believed that the top of the water zone at location 7is between 1,758 and 1,765 Elev (about 251 bgs). The top of the water zone will be located,and yield rate and MCL constituents will be evaluated. Borehole GH-7C will be advanced tothis approximate depth to evaluate the top of the water zone. A monitoring well will beinstalled within GH-7C with 5-feet of screen below the water and 5-feet above per the requestof the USEPA's June 18, 2001 correspondence, unless a confining unit is found before the 5-foot interval.

Once the data on the top of the water zone is known, SCS proposes to drill another boring(GH-7D) to locate a confining layer below the elevation of the well in GH-7C or to amaximum of 15-feet below the first reported water level (saturated zone) in GH-7C. If aconfining layer is found, a casing will be set and procedures in the Work Plan will befollowed. If no confining layer is found within the 15-feet, GH-7D will be reamed and acasing will be set to a depth of 15-feet below the first reported water level (saturated zone) inGH-7C. If no water is found, GH-7D will be continued through the set casing usingprocedures in the Work Plan. If water is found below the casing elevation, drilling will stopand the USEPA will be contacted.



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SCS proposes to locate a new borehole, GH-7C, having the following approximatecoordinates: Northing 15,575; Easting 12,300. This will be approximately 20 feet west ofGH-7B and will be located near CSAMT Lines 3 and 11. The surface elevation will bemeasured at the location of GH-7C, recorded and used as a reference point.

It is proposed that the T4 drill rig currently being used at the Site be used to drill a pilotborehole at the GH-7C location. From the surface to 1,790.0 Elev (about 223 bgs), samplecuttings from the air rotary discharge will be observed by the Field Geologist and compared tolithology reported for boreholes GH-7A and GH-7B. If cutting samples indicate possibledeviation from the previously logged boreholes at location 7, as determined by the FieldGeologist, or if saturated conditions are unexpectedly encountered, advancement will stopimmediately and drive samples will be collected. Continuous core samples consisting of splitspoon sampling as defined in the Work Plan will be used from 1,790 Elev (about 223 bgs) tothe depth water is detected. The pilot borehole will be advanced behind the continuous core(split spoon) samples.

Based on review of the water elevation, first reported water, and the lithology of boreholesGH-7A and GH-7B, it is anticipated that the top of the aquifer at location 7 is going to occurbetween 1,758 and 1,765 Elev (about 251 bgs). This is subject to change and verificationduring the drilling of GH-7C. The important thing is that as the anticipated top of aquiferelevation is approached, the continuous core sample and drilling advancement must be sloweddown. Water level in the borehole should be checked after each core sample starting at 1,775Elev (about 238 bgs) and downward until the top of the aquifer is located.

Once the top of aquifer elevation is known, borehole GH-7C should be advanced to the top ofa confining layer or a maximum of six feet below the top of aquifer elevation with continuouscore sampling. Boring logs will be completed by the Field Geologist for borehole GH-7C. Amonitoring well will be completed in GH-7C with the bottom of the screen set at 5-feet belowthe first reported water level (saturated zone) and top of screen set at 5-feet above the firstreported water level in GH-7C (as requested by USEPA's June 18, 2001 correspondence),unless a confining unit is found at less than 5-feet.

It is anticipated that geophysical logging will not be performed in GH-7C since it wasperformed in GH-7B. The Field Geologist who will perform the quality control check asdiscussed in Section 2 of this document, will verify this assumption. After borings at location7 go below 1,367.3 Elev (about 640 bgs), geophysical logging will be performed.

SCS proposes to locate a new borehole, GH-7D, having the following approximatecoordinates: Northing 15,560; Easting 12,285. This will be approximately 20 feet southwestof GH-7C and will be located near CSAMT Lines 3 and 11. The surface elevation will bemeasured at the location of GH-7D, recorded and used as a reference point.

Borehole GH-7D will follow the exact same procedures as outlined above for GH-7C, exceptthat the borehole will be advanced until a confining layer is found below the bottom elevationof GH-7C or the borehole is a maximum of 15-feet below the first reported water elevation inGH-7C. If a confining layer is found, a casing will be set and the borehole will be continuedin accordance with the procedures in the Work Plan.

Sunrise Mountain Landfill 10Geohydrologic Drilling Program 10199007.01 Task 4

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If no confining layer is found, drilling advancement will be stopped at 15-feet below the firstreported water level (saturated zone) in GH-7C. After the water elevation is obtained, theyield rate of borehole GH-7D will be determined. A bailer will be used to evacuate theborehole and the recovery will be monitored. A yield rate will be calculated. Borehole GH-7D will then be reamed and a casing will be set to a depth of 15-feet below the first reportedwater level (saturated zone) in GH-7C. If no water s found, GH-7D will be continued throughthe set casing as per the Work Plan. If water is found in the core samples or in the borehole,drilling will stop and the USEPA will be contacted.

If no water is found, the boring will be advanced to the next saturated zone. If no confiningunit is found within 15-feet of encountered water in the next zone, drilling will be stopped.Yield rates will be determined. If a monitoring well is needed, it will be installed with a 20-foot screen (15-feet below and 5-feet above first reported water/saturation zone). Otherwise,the water zone will be sealed off and drilling will continue using procedures in the Work Plan.


It is anticipated that GH-7C will be completed successfully, and can be used to install MW-7C. The well will be installed, completed, developed and sampled as defined in the WorkPlan, except that a 10-foot screen will straddle the top of the aquifer as requested in USEPA'sJune 18, 2001 correspondence.

Sunrise Mountain Landfill 11Geohydrologic Drilling Program 10199007.01 Task 4

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Only one borehole has been advanced at location 15 (GH-15A). Layne-Christensen Drillingstarted this borehole on October 13, 2000. GH-15A has the following coordinates andelevation: Northing 14,471.90; Easting 13,119.60; and 2031.42 Elev. Between October 13and 18, 2000, the borehole was advanced from 0 to 281 feet below ground surface (bgs)(2,031.42 to 1,750.4 Elev) using a percussion hammer rig for the first 31 feet and a reversecirculation rig from 31 feet to 281 feet. A water sample was taken on October 18, 2000. OnOctober 19, 2000, the boring was advanced two feet from 281 to 283 feet bgs (1,750.4 to1,748.4 Elev). A water level of 275.53 feet bgs (1,755.89 Elev) was recorded on October 19,2000.

It is reported in the boring log for GH-15A that on October 20, 2000, the borehole was blownout prior to further advancement to relieve the borehole of water. On October 20, 2000,drilling continued in GH-15A and proceeded from 283 to 317 feet bgs (1,748.4 to 1,714.4Elev). A water sample was taken on October 20, 2000 and a water level reading of 278.65bgs (1,752.77 Elev) was recorded.

Drilling resumed on October 23 through October 24, 2000, with the borehole being advancedfrom 317 to 387 feet bgs (1,714.4 to 1,644.4 Elev). A water sample was taken at the end ofthe day on October 24,2000. On October 25,2000, drilling continued and the borehole wasadvanced from 387 to 437 feet bgs (1,644.4 to 1,594.4 Elev). A water sample was collectedat the end of the day on October 25, 2000. On October 26, 2000, the boring was advancedfrom 437 to 517 feet bgs (1,594.4 to 1,514.4 Elev). A water sample was collected at the endof the day on October 26, 2000. On October 27, 2000, borehole GH-15A was advanced from517 to 597 feet bgs (1,514.4 to 1,434.4 Elev).

Drilling resumed on November 17, 2000, when Western Hazmat used an air rotary rig to drillfrom 601 to 612 feet bgs (1,430.4 to 1,419.4 Elev). The final day of drilling for borehole GH-15A was on November 27, 2000, when the borehole was advanced from 615 to 626.2 feet bgs(1,416.4 to 1,405.2 Elev). It was reported that during the drilling on November 27, 2000, theborehole was blown out twice with 50 to 60 gallons of water recorded on the boring log asaccumulating during approximately two hours and forty minutes between blow outs. Theboring log indicates that the hold was producing too much water to use the rotary air drillingmethod. Two additional water levels were recorded on November 28, 2000.

Time

**

**

12:50**

Date

10/19/2000

10/20/2000

1 1/28/2000

1 1/28/2000

Boring Depth, (ft)bgs

283

317

626

626

Water Level, (ft)bgs

275.53

278.65

340.31

295.69


1755.89

1752.77

1691.11

1735.73

Note: Water was first reported in GH-15A at 281 feet bgs (1,750.4 Elev)


12 SCS ENGINEERS10199007.01 Task 4

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Based on a review of available data, it is believed that the top of the water zone at location 15is between 1,748 and 1,755 Elev (about 279 bgs). The top of the water zone will be located,and yield rate and MCL constituents will be evaluated. Borehole GH-15B will be advancedto this approximate depth to evaluate the top of the water zone. A monitoring well will beinstalled within GH-15B with 5-feet of screen below the water and 5-feet above per therequest of the USEPA's June 18, 2001 correspondence, unless a confining unit is foundbefore the 5-foot interval..

Once the data on the top of the water zone is known, SCS proposes to drill another boring(GH-15C) to locate a confining layer below the elevation of the well in GH-15A or to amaximum of 15-feet below the first reported water level (saturated zone) in GH-15B. If aconfining layer is found, a casing will be set and procedures in the Work Plan will befollowed. If no confining layer is found within the 15-feet, GH-15C will be reamed and acasing will be set to a depth of 15-feet below the first reported water level (saturated zone) inGH-15B. If no water is found, GH-15C will be continued through the set casing usingprocedures in the Work Plan. If water is found below the casing elevation, drilling will stopand the USEPA will be contacted.


SCS proposes to locate a new borehole, GH-15B, having the following approximatecoordinates: Northing 14,483; Easting 13,104. This will be approximately 20 feet northwestof GH-15A and will be located on CSAMT Line 11. The surface elevation will be measuredat the location of GH-15B, recorded, and used as a reference point.

It is proposed that the T4 drill rig currently being used at the Site be used to drill a pilotborehole at the GH-15B location. From the surface to 1,780.0 Elev (about 251 bgs), samplecuttings from the air rotary discharge will be observed by the Field Geologist and compared tolithology reported for borehole GH-15A. If cutting samples indicate possible deviation fromthe previously logged borehole GH-15A, as determined by the Field Geologist, or if saturatedconditions are unexpectedly encountered, advancement will stop immediately, and drivesamples will be collected. Continuous core samples consisting of split spoon sampling asdefined in the Work Plan will be used from 1,780 Elev (about 251 bgs) to the depth water isdetected. The pilot borehole will be advanced behind the continuous core (split spoon)samples.

Based on review of the water elevation, first reported water, and the lithology of boreholeGH-15A, it is anticipated that the top of the aquifer at location 15 is going to occur between1,748 and 1,755 Elev (about 279 bgs). This is subject to change and verification during thedrilling of GH-15B. The important thing is that as the anticipated top of aquifer elevation isapproached, the continuous core sample and drilling advancement must be slowed down.Water level in the borehole should be checked after each core sample starting at 1,765 Elev(about 266 bgs) and downward until the top of the aquifer is located.



Once the top of aquifer elevation is known, borehole GH-15B should be advanced to the topof a confining layer or a maximum of six feet below the top of aquifer elevation withcontinuous core sampling. Boring logs will be completed by the Field Geologist for boreholeGH-15B. A monitoring well will be completed in GH-15B with the screen set at 5-feet belowthe first reported water level (saturated zone) and top of screen set at 5-feet above the firstreported water level in GH-15B (as requested by USEPA's June 18, 2001 correspondence),unless a confining unit is found at less than 5-feet.

Since geophysical logging was not performed on GH-15A, SCS proposes to performgeophysical logging as defined in the Work Plan for the pilot borehole at GH-15B.

SCS proposes to locate a new borehole, GH-15C, having the following approximatecoordinates: Northing 14,470; Easting 13,090. This will be approximately 20 feet southwestof GH-15B and will be located near CSAMT Line 11. The surface elevation will be measuredat the location of GH-15B, recorded, and used as a reference point.

Borehole GH-15C will follow the exact same procedures as outlined above for GH-15B,except that the borehole will be advanced until a confining layer is found below the bottomelevation of GH-15B or the borehole is a maximum of 15-feet below the first reported waterelevation (saturated zone) in GH-15B. If a confining layer is found, a casing will be set andthe borehole will be continued in accordance with the procedures in the Work Plan.

If no confining layer is found, drilling advancement will be stopped at 15-feet below the firstreported water level (saturated zone) in GH-15B. After the water elevation is obtained, theyield rate of borehole GH-15C will be determined. A bailer will be used to evacuate theborehole and the recovery will be monitored. A yield rate will be calculated. Borehole GH-15C will then be reamed and a casing will be set to a depth of 15-feet below the first reportedwater level (saturated zone) in GH-15B. If no water is found, GH-15C will be continuedthrough the set casing per the Work Plan. If water is found in the core samples or in theborehole, drilling will stop and the USEPA will be contacted.

If no water is found, the boring will be advanced to the next saturated zone. If no confiningunit is found within 15-feet of first encountered water in the next zone, drilling will bestopped. Yield rates will be determined. If a monitoring well is needed, it will be installedwith a 20-foot screen (15-feet below and 5-feet above first reported water/saturation zone).Otherwise, the water zone will be sealed off and drilling will continue using procedures in theWork Plan.


It is anticipated that GH-15B will be completed successfully, and can be used to install MW-15B. The well will be installed, completed, developed and sampled as defined in the WorkPlan, except that a 10-foot screen will straddle the top of the aquifer as requested in USEPA'sJune 18, 2001 correspondence.

. . . ._.. j , ,Sunrise Mountain Landfill 14Geohydrologic Drilling Program

IIIIIIIIIIIIIIIIIII


ATTACHMENT A

BORING TRACKING LOG


SCS ENGINEERS

10199007.01 Task 4

VW# ^m ••terHHtiorfBV thtBlinstdHBi |VBBom«Vamp« i WPP PB«ing"P"" ••• "CurFW! ^— l^—1 (MSL) | Water | Date | Date | Date | Development! Depth | Status

MW-1AGH-1B(AB-1B)PW-1CMW-2A (2")MW-2A (4")PW-2BGH-2C (AB-2C)PW-2C2 (2")PW-2C2 (4")PW-2DPW-2D2GH-2EGH-2E2GH-3A (AB-3A)GH-3B (AB-3B)GH-3B2 (AB-3B2)GH-3CGH-3CL (AB-3CL)GH-3DPW-4APW-4BPW-4CMW-5A (AB-5A)GH-5B (AB-5B)GH-5B2 (AB-5B2)GH-5B3 (AB-5B3)PW-5B4PW-5CGH-6A (AB-6A)PW-6B (2" inside 4")PW-6CGH-7A (AB-7A)GH-7B (AB-7B)MW-8AMW-8BPW-9APW-9BPW-10APW-11A(2"inside4"PW-11BMW-11CPW-12AGH-12B(AB-12B)

DryNA

1763.931688.70

Dry1699.80

NA1700.751701.311560.021688.63

NANANANANANANANA

1673.601680.501616.91

NANANANA

1723.041754.19

NA1764.201766.46

NANA

1754.391667.671751.211765.851772.811671.781688.001298.871682.64

NA

DryNA

246.38197.27

Dry202.31

NA219.00218.44352.12224.15

NANANANANANANANA

188.78184.91254.71

NANANANA

181.08146.57

NA208.51208.97

NANA

398.05481.65449.10449.93668.50217.53193.65589.73200.58

NA

4/11/2000Abandoned

1/9/20015/15/20005/15/20004/16/2001Abandoned

8/9/20008/9/20002/21/20013/2/2001

NANA

AbandonedAbandonedAbandoned

On-HoldAbandonedAbandoned8/17/20001/23/20013/14/2001

AbandonedAbandonedAbandonedAbandoned

4/5/20018/23/2000

Abandoned7/13/20001/11/2001

AbandonedAbandoned3/16/20013/7/20012/2/20015/7/2001

2/15/20018/25/200011/8/20005/25/200110/11/2000Abandoned

7/5/2000NA

1/10/20017/5/20007/5/20004/20/2001

NA8/18/20008/18/20003/8/20013/8/2001

NANANANANA

On-HoldNANA

3/8/20013/8/20013/27/2001

NANANANA

4/20/20018/29/2000

NA7/20/20001/31/2001

NANA

3/21/20014/20/20012/7/20015/30/20013/13/20018/29/200011/17/200C

NA11/16/200C

NA

NANA

1/31/200111/2/20005/9/20005/16/2001

NA8/2/2000

12/28/200012/13/20003/22/2001

NANANANANA

11/8/2000NANA

1/11/20012/27/20015/9/2001

NANANANA

9/20/200012/6/2000

NA1/10/20011/29/2001

NANA

1/30/20013/2/20013/1/2001

5/23/20013/14/200112/28/200C11/29/2000

NA12/7/2000

NA

NANA

1/31/2001In Progress

NA5/16/2001

NA1/15/20011/15/20014/16/20013/21/2001

NANANANANANANANA

1/11/20011/26/20015/9/2001

NANANANA

6/15/200112/5/2000

NA1/5/20011/29/2001

NANA

In ProgressIn Progress3/1/20015/23/20013/14/200112/28/200011/28/2000In Progress12/4/2000

NA

102'420'682'215'215'215'

230.5'263'263'533'440'687'NA216'247'247'500'116'813'295'806'470'

192.5'130'125'412'733'154'10'

227'431'185'645'398'492'535'475'720'407'260'828'

252.5'263'

Well InstalledAbandonedDeveloped and sampledWell Installed Being DevelopmentWell InstalledDeveloped and sampledAbandonedDeveloped and sampledDeveloped and sampledDeveloped and sampledDeveloped and sampledSurface conductor installedSurface conductor installedAbandonedAbandonedAbandonedOn-HoldAbandoned/SonicLITHOLOGYDeveloped and sampledDeveloped and sampledDeveloped and sampledAbandonedAbandonedAbandonedAbandonedDeveloped and sampledDeveloped and sampledAbandonedDeveloped and sampledDeveloped and sampledAbandonedGrouted UpBeing DevelopedBeing DevelopedDeveloped and sampledDeveloped and sampledDeveloped and sampledDeveloped and sampledDeveloped and sampledBeing DevelopedDeveloped and sampledAbandoned

gwwells0622.xls Information Current as of June 22, 2001 7/9/20013:13PM

'W-12B2 1706.70 181.97 | 3/29/2001 4/20/2001 | 4/26/2001 | 4/24/2001 484' Developed and sampled

GH-12C(AB-12C) NA NA Abandoned NA NA NA 1217' LITHOLOGYMW-12D 1093.73 787.10 5/1/2001 5/30/2001 NA In Progress 810' Being DevelopedGH-13A(AB-13A) NA NA Abandoned NA NA NA 477' Grouted UpGH-13B(AB-13B) NA NA Abandoned NA NA NA 327' Grouted UpPW-14A 1682.65 216.43 11/30/2000 12/1/2000 1/9/2001 1/8/2001 226' Developed and sampledGH-15A(AB-15A) NA NA Abandoned NA NA NA 636' Grouted Up

gwwells0622.xls Information Current as of June 22, 2001 7/9/20013:13 PM

drilling plan - geohydrologic drilling program, locations ...drilling plan sunrise mountain landfill...

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