NCD980840409_19930519_Charles Macon Lagoon & Drum_FRBCERCLA SPD_Aquifer Test Procedure-OCR

MAY 1 9 1993
4WD-NSRB
i;= I L..Q.:. MA CDN . D Ll:... '~ <.. '{ •'. ~~ .... ~-~•-.•~--··•·:··::•:· ., .. :,_ :···• 'll:.,... . . ' . . . ., •'
UNITED STATES ENVIRONMENTAL. PROTECTION AGENCY
REGION IV
345 COURTLAND STRE:E:T, N.J;;;,
ATLANTA, Gf:.ORUIA 30°36~
Technical Committee
c/o David L, Jones
Clark Equipment Company P.O. Box 7008 . GEf~':.RAL SE"VIC!:S A01.11NISTRATlON
South Bend, IN 46634
RE: Macon/Dockery NPL Site
Cordova, NC
Dear Mr. Jonesi
The aquifer test procedure submitted on April 29, 1993, as revised by your letters of May 13, 1993 and May 18, 1993, is approved. Even though the test will be completed shortly, please incorporate all changes and submit a complete final document for the file, The final aquifer test procedure document is due no later than June 41 1993.
If you have any questions, please give me a call.
Since~ ~: ...... ~~
Remedial Project Manager
oc1 Wayne Barto, de maximis
Norma Eichlin, CDM
Patrick Watters, NC DEHNR
•
Printod on nccycltd Pt1pt1r
• sz
de maximis, inc.
904 I Executive Park Dr.ve
Suite 601
Knoxville. TN· 37923
(SI 5) 691-5052
FAX TRANSMITTAL SHEET
PRO.J ECT /FI LE
THIS FAX CONSISTS OF II PAGE($) INCLUDING THIS COVER SHEET.
TO:
TELECOPIER NUMBER:
FROM: hJ~nr
Please call [phone] if there are any problems with this
transmission (FAX Number 615 691-6485).
REMARKS:
Please accept this facsimile of the Group's response to U.S. EPA's comment letter of
May 10, 1993 on the Aquifer Test Procedure. In· the interest•. of saving· timing and
facilitating agency approval, I have taken the liberty to transmit this fax directly to the
individuals listed below. Please contact me at your earliest convenience to arrange a
conference call to discuss any review comments. Hard copy of this document will follow
by mail. Please note that the piezocone data mentioned in the response is not
•.transmitted with this facsimile but will be forwarded with the hard copy by mail.
Also sent to:
Norma Eichlin
CDM-FPC
404-951-891 0
f:\projects\30€8\fax.:rr
Steve Hall
Region IV-ESD
706-546-3340
Pat Waters
NC DEHNR
919-733-4811
Unless Othen.,is.o indicated, t!ie infonnatlOrl ·contained in t~is facsi11H! ~ is privHeged and
confiQY\ti:1l inforKlticri intended for the use of th,e indivtdJ.ll or entlty ~ above •. If t~e reader of
t.his JDeS&age i~ not the intended recipient, or the cq,lovec.al" ~gent ~~1~le to del1~r-lt to !he
interYX'd: reeipient, you are heret,y not;t;ed that arry di~sem1nat1on. d1s~~1~1~. or c~1ng of th1s
coom.n1c:Jt1on i& str-lctly prohibftcd. If you have received thi::. CCN1U'l1C-.ltion 1n error ~r are riot sure
whether" it is pri'Vileged, pl~ase ill11Ediiltely notify us by t:e:lephcne.,and destroy all cop1es <lnd return the
or-iginal message to us at the above address vfa the u_s_ Postal serv1ce ilt our expense.
File:f:LX.fona.dsk:5
• •
Macon/Dockery Site
Richmond County, North Carolina
May 13, 1993
Ms. Giezelle Bennett
Remedial Project Manager
US EPA, Region IV
345 Courtland Street
· Atlanta, Georgia 30365
Reply to: Technical Comnittee
c/o David L. Jones
Clark Eqi..cipment Conipany
P. 0. Box 7008
South Bend, rn 46634
Phone: [phone]
Fax: [phone]
Subject: Macon/Dockery Site -Cordova, NC
Response to Agency Comments on the
Aquifer Test Procedure Memorandum
Dear Ms. Bennett:
Enclosed please find the Group's response to agency comments received through your
correspondence dated May 10, 1993. The format of this. response includes a restatement of the
agency comment followed by the Group's response prepared by RMT, Inc. This response
should be considered as an addendum to the previm::sly submitted Aquifer Test Procedure
memorandum, and therefore, the changes noted will supersede, as appropriate, the applicable
portions ot the original submittal.
As you are aware, the aquifer test is the final field activity. This is reflected in the· revised
schedule previously provided to U.S. EPA on April 22, 1993. The revised schedule indicates that
the pump test is to begin on May 17, 1993. · In order, to stay as close to this schedule ·as
possible, the Group requests your review and approval of this submittal at your earliest
convenience.
Please call me at [phone] or contact Wayne Barto or Bruce Thompson with de maximis,
·. inc. at (615) 691 ·5052 if you have any further questions or wish to schedule a conference call
for discussion of this submittal.
Sincerely,
Ocvv--ul c. /Jc:::r
David L. Jones w,-~
Project Coordinator
Macon/Dockery Technical Committee Chairman
WFB/jca
Attachments
cc: Macon/Dockery Technical Committee Members
Jim Marler, RMT, Inc
Wayne Barto, de maximis, inc.
l:\projects\3068\mdcvrltr
•
US EPA COMMENT
•
US EPA/NORTH CAROLINA COMMENTS
TO AQUIFER TEST PROCEDURE
PROJECT: MACON/DOCKERY SITE
CORDOVA, NC
1. Page 2 • The first paragraph should give an estimate of the depth of each plezometer and
pumping well.
The reference to the ESD SOP has a typo.
RESPONSE
The estimated depth of drilling to install the piezometers and pumping well is 80 feet below
ground surface.
The typographical error is noted for the ESD's SOP.
US EPA COMMENT
2. As stated earlier, PVC Is fine for the use specrfled-.tn this•document. However,-EPA will
not consider any sampling data, that may come from these wells In the future.
RESPONSE
US EPA's comment is acknowledged, The piezometers will·be installed for purposes·of
obtaining water level data only and will not be used for obtaining ground water samples. Toe
pumping well, on the other hand, will be sampled periodically during the pumping phase of
the aquifer test. The samples obtained will be analyzed for the constituents of concern and
other inorganic constituents such as iron. This testing is being done to support the basis for
the preliminary design. This testing is not being done for compliance monitoring. For final
design, a monitoring program will be developed that includes some existing monitoring wells
and may include new monitoring wells. Should new wells be required for compliance
monhoring, they will be designed using US EPA approved materials of construction for
monitoring purposes.
US EPA COMMENT
3.. Page 7 • The specifications for the submersible pump should be given. The document
reports that the range for gw flow will be between 0.5 and 15 gpm. However, other
calculations In this document (660 gal In 120 min) seem to Indicate that the rate will be
about 5 gal/min. In addition, what backup measures will be taken If the data logger goes
out? It Is the Agency's understanding that Ground Water Technology no longer makes
data loggers. This may cause undue delays.
G;\QATA\Ci,LOAI.A\YiP1?0\'11Xl1"loa,.CMT/GSA83 Page 1 of 5
11r--1, '· ,_,_,. --f-: < _,;_ 1·(Ml';.;.1·1.:.::,
• •
US EPA/NORTH CAROLINA COMMENTS
TO AQUIFER TEST PROCEDURE
PROJECT: MACON/DOCKERY SITE
CORDOVA, NC
RESPONSE
The specifications for the submersible pump are as follows:
1. Manufacturer: Grundfos,
2. Model: Redi-Flo2 • 2' Environmental Submersible Pump,
3. Pump Type -MP1,
4. Flow Range: ContinuousNariable (100 ml/min -9 US GPM), and
5. Pump End Construction Materials: Stainless Steel and Teflo~.
Regarding the reference to 'other calculations· referred to in the review comments, there
seems to be some misunderstanding of the information provided. The pre-test portion of the
procedure refers to the equilibration phase of the aquifer test following the step-drawdown
test. Therefore the values grouped in the example used in the comment '660 gallons in 120
minutes' do not relate to each other. AMT cannot predict, but can estimate the actual well
yield ahead of time. We haveideveloped a testing•scheme.that can be applied generically.
This testing scheme has worked well in other pumping tests. The submersible pump.will be
adequately sized to allow for the potential withdrawal· of ground water at rates that at this time
are projected to above the anticipated well yield.
AMT will be utilizing electronic• water level indicators in the event the data logger and·
transducers breakdown during the test. The data logger will be outlined appropriately with
sufficient equipment including extra transducers and banery.
US EPA COMMENT
4. The entire discharge sequence should be fully described and also shown on Figure 3
Including sampling locations. The scenario now does not have any provisions.for
sampling or water collection after the treatment system, How will treatment be conflrmed
and what will happen to the water during the 12-hour sampling Interval? The first
sampling event should occur one hour after treatment has begun before the 12,hour
Interval starts.
RESPONSE
Ground water pumped from the well will pass through a flow meter and into a 200-gallon
storage tank. This tank will provide approximately 40 minutes of settling time to allow larger
particles to be removed. Senled water will be pumped by a positive displacement gear pump
into a 1 o micron cartridge filter to remove any additional solids. These cartridges will hold
approximately 90 grams of material before the pressure drop necessitates replacement. Six
ion exchange units, operated in a series configuration, will remove iron and manganese to less
than o.3 and 0.05 mg/L. respectively. Ground water will then be treated for organics removal
by two activated carbon contactors in series. These ss.gallon units have been designed to
remove the organics, namely, chloroform, TCE, PCE, and 1,1-DCE, to below detectable limits.
0:\CA T A\G:.OAIA\WP\70\7001 708.CMT /OSA,g:J. Page 2 of s
10: 13 'B803 28 l 0288 R. ~. T. CVL. SC. • •
US EPA/NORT11 CAROLINA COMMENTS
TO AQUIFER TEST PROCEDURE
PROJECT: MACON/DOCKERY SITE
CORDOVA, NC
The treated water will then be discharged to the ground In the location designated In the
previously swbmined Aquifer Test Procedvre (see revised i=i9ure 3).
RMT does not propose any testing of the treated water to cannrm removal of the COCS. We
feel that this Is unnecessary r:,ecause the system is designed to treat all canslltuems ta levels
below detection far the (.)(ganics and below performance standards for inorganics (see
response to US EPA Comment No, S). AMT feels that set-up and operation of a tank to
collect the entire volume of water generated durinlJ the pump test is an expensiVe and
unnecessary burden. n,;s procedure has previc,usly bMn utili~ed on a similar project and
pump test procedure performed in US EPA Region IV.
US EPA COMMENT
5. The target discharge concontratJons should also be speclned. Whll1 will happen It the
waler la sampled and II le above the opproved dlncharge llmlls?
RESPONSE
Based upon the response made in comment # 4 above, the water withdrawn in the pumping
test should meet the performance standards contained In the Record of Decision. The
pertoi_mance standards for this site are based upon,the USEPA Federal Drinking Water,
Standards or the North Carolina Water Quality Standards; whichever are most stringent.
NORTH CAROLINA COMMENT
1. Aaallre that \he locadons and depth of the aquifer teat wella nre appropriate with regard to
the venlcal extent of contamlnotlon.
FIESPONSE
The vertical eX1em of affected ground warer was evaluated In the RI/I'S with confirmation
testing recemly completed In the field screening assessment program. The location and
depth or the pumping well is consistent with those resuns. The results of the pumping tests
along with the field screening results, will be considered in the long-term remedial design for
tlle sne. The remedial design wlll be based upon consideration or all the technical Information
developed so that a cost-effective system can be put in place.
NQBIH CARQL(NA COMMENT
2. The top al_ the well ocreena ahculd be located at or above the lop of the waler table.
A/;SPONSE
The top of the well screens far the piezometers installed are at the top of the water table
sur1i3ce. The top of the pumping well screen is slightly below the watar table surface by
Page 3 of S
05/13,93 16; 13 R.H. T. GVL. '
US EPA/NORTH CAROLINA COMMENTS
TO AQUIFER TEST PROCEDURE
PROJECT; MACON/DOCKERY SITE
CORDOVA, NC
P.5/ll
Qi 00·VOli9
appro~irna:tely three feet. However, the gravel pack for this well extends above the top of the
screen 10 the water table surface. Thereby resulting in the pumping well lully penetrating the
aqu~er's thickness.
NORTH CAROLINA COMMENT
3. Asaure that well tag" are ueed tor ldenttflcatlon purp1;u1ea.
RESPONSE
The well tags will be used for the piezornaters and recovery well.
NORTH CAROI.INA COMMENT
4. Page s referenced the North Carolina Administrative Code regarding well abandonment
procedures. Note that there are specific sections of this code concarnlng permitting-and
well conatrucilon that would apply to this aquifer teat.
RESPONSE
The Nonh Caronna Administrative. Code has oeen reviewed. If the pumping well• is
abandoned, the applicable requirements will be followed.
NORTH CAROLINA COMMENT
5. The procedure notM on Page 2 that Secilon 5.3 of the FSAP wlll be followed regarding
dec:ontnmlnallon of the drlll rig 11nd aampllng equipment. The next sentence Indicates that
"thJs• equipment wlll be decontaminated with materials apeclfled In the ESDSOP.QAM and
list• the six ateip cleaning and rinsing proceias on Page 3. Thia six .,1ep proce&a pertains
only to sempllng equipment; however, this la not cle11r In the proi;cd1.1re. Sond blasting
ind ateom cleaning le apectncelly noted In Section 5.3 ot the FSAP &P pert of the
doc:ontamlnatlon proceaa tor drllllng equipment.
RESPONSE
The six-step decon process is Intended to address only sampling and drilling equipment usad
in our field p,oceduro:..
NORJtl CAROLINA COMMENT
8. Page 8 of lho procedure u,rerencee Section 5.10:J a1 lho FSAP rugardlng the <llsposttlon
of dlacharge w11ter generated during the 1quller le:at. This part of tho FSAP Includes
provision& for dlspo&al to a POlW under certain conditions. The procedure only has
provisions for on-elte disposal. Also, note that there may be some permitting
re9ulremenls for disposal of the discharge water either on-site or via a POlW.
Page 4 of s
I ,r, I .4-'
· 05/l3r93 16: 14
RESPONSE
'8'803 281 0288 R. M. T GVL. SC. • •
US EPA/NORTl1 CAROLINA COMMENTS
TO AQUIFER TEST ?ROCEDUAE
PROJECT: MACON/DOCKERY SITE
CORDOVA, NC
tt is noted that if disposal, other than on-site, is required, then substantive compliance wnh
permitting requirem&nts for water disposal will be provided.
NORTH CAROLINA COMMENT
7. It only one aquifer teat 19 conducted on thl1J one, sufficient JuallHcatlon and rationale will
ne<td to be presented In the fulur11 to &how that the r8$ult" or the aquifer teat can be
applied to th" 8ntlre site. Thia la especially Important since this site Is comprloed or
:aeveral areas th81 are not contlguoua.
RESPONSE
The data from the recently completed field screening assessment program was used in
conjunction with the review of RI/FS documentation to determine the number of pumping tests
needed. While the field screening assessment program was· focused on water quality. the·
'direct pu!<h" testing aliowed,collection of additional.hydraulic conductl111ty data.
The fielO screening program·lncluder;I the collection of piezocones (soil characteristics),
geocones (soils) and hydrocones: (waler and calculated hydraulic conductivity). An e~ample·
of the piezocone test resunsofor.each,area at the site-is.inclucied as an attachment., Toe·data,
show a variable, but similar lithology for each area.
In aOdition, a slgnlflcant number of hydraulic conductivity values were generatocl for each
area. The number of data points are as follows:
Upper Macon
Lower Macon
Upper Dockery
LOW8' Dockery
36
23
17
a
As can be seen In review of the data. the hydraulic conductlvliy tends to be In the 1 o·• cm/sec
range. The geometric mean calculated for the set of data obtained in each area be,ars this
ou1. From this Information It was concluded that a single pumping test would be sufficient and
that the results could be flxtrapolated to the other three areas.
Q~TAI/J,/,,J;,llt,,\Wf'\""/"0\7001J'm.a..T~ ?ages of s
16: 14 '5'8~281 0288 R. M. T. CVL.
TABLE 1
MACON/OOCKERY SITE
HYDFIOCONE TESTING -HYDRAULIC CONDUCTIVl'IY
(cm/aec)
. UPPER MACON . ..... ,: :' : : •:.:•·:.:,••· ···•· i/:lOWER •. MACOII i , .. _.., ... •'
. w.• • , ..... ,, .. ... ""' .. ··"
.... , .. ,.,
7.03 X 10,. 3.09 X 10,.
4.52 X 10,. 9.84 x 10 ..
1.23 X 10"' 1.37 X 10,.
1 .40 X 10"1 6.21 X 10,o
1,73 X 10'5 3.53 X 10'5
1,40x ,o .. 4.64 X 10''
S,00 X tO"' 3.32 X 10"
1.65 X 10"' 1.13 X 10"
4,57 X 10'' 5.04X 10"'
2.95 X 104 1.32 X 104
2.20 X 10'5 1,64X 10"'
1.15 X 10 .. 2.35 X 10''·
4.92 X 10" 4.26 X 10,.
1.05 X 10'' 1.04x 10 ..
4,74 X 10" 1.47 X 10"'
3.09 X 10" 4.56 X 10-6
4.99 X 10'5 1.19x10 ..
6.66 X 10 .. 5.43 X 10"'
1.36 X 10"' 1.21 X 10-6
3.26 X 10" 1.68 X 10"
1.34x 10"' 5.17x10·•
6.31 X 10• 1.37 X 10"
2.72X 104 5.12 X 10"
2.42 X io ..
1.70 X 10'5
1.79x 10·•
' ··" . ... .....
16: 15
Geometric
'6'803 281 0288 • ,_ It i. GVL. SC.
TABLE 1 (Continued)
MACON/DOCKl:.RV SITE
•
HYDROCONE TESTING • HYDRAULIC CONDUCTIVITY
,, . . ,
UPPERWJICON (C~n't)i : .
. .. : .,,,, •·I.•.'" ,.., .. -, ...... ,,,,,, ····~••' .. ,,,,, ... ' .. .. : ... ,.,_.,., :•·-•-> ..... ... ., .... ··· .--LOW~R MACON, (C<>n_'t)•:······ .. . ,
1.84 X 10"'
1.99 X 10 ..
2.97 X 10·'
5.71 X ,o-6
1.04 X ,o·•
2.91 X 10 ...
1.55 X , o""
6.26 X ,o ..
3.24 X 10"
8.37 X 10"
Mean 5.86 X 10" Ge0metrlc;_Me11n 7.32 X ,o ..
. -
,UPPER OoCKERV ... ,. . ::•:._:· . .. •:,:,.:.:.:_ '\LOWER DOCKERY·'.' "' '"" ,., ...... ,,.,,., .· . ..
4.01 X 10'' 1.99 X 10-o
6.52 X 10·• 2.20 x ,~
S.26 x 10-o 1.38 X 10"'
3.20 X 10'' 1.93 X 10"
3.35 X 10◄ 7.97 X 10 ..
3.33 X 10·• 6.76 x ,o ..
3.06 X 10◄ 1.74 X 10"
7.64 X 1cr' 3.36 X 10_.
4.26 X 1cr'
-
4.2Bx 104
1.01 X 10"'
Geomotrlc ..
~ M. T. GVL .•
TABLE 1 (Continued)
MACON/OOCKERY SITE
HYDROCONE TESTING -HYORAUUC CONOUCTIIIITY
UPPER DOCKERY (C~~~, ;· :,.:; ... " '{,.:· :>, ,; ... /'}(owe,b:ioci<EA'I' (t:&t '\i ·_; .. _ .. .... : :,•.,,.,,
1.89 X ,o ..
3,94 X 10-'
1.09 X ,o~
1.67 x 10·•
4.49 X ,o ..
3.83 X ,o ..
Mean 4,88 X 10 .. Geomotrlc M&an 3.72 X ,o ..
P. 10/ll
!ii}008/009
f>U!,P -
'
-
.
ION EXCHANGE
UNITS
I
ACTIVATl:D
I CARBON ~----OF.ECT DISCHARGE 10 1 1 1 1
TfE SOL ON-SITE
FILTER
FIGVR£ 3
PUMPING TEST DISCHARGE WATER
TAEAThENT SYSTEM
REV!SlON 1
MACON ooci<ERY SITE
CORDOVA.NC
J: •OA.RDfORA.f'HtJafl
0 ln
' -to ' "' "-'
-u,
J -
,_
.. ~ -Ul
~ -~ .,_,
O> -0 "-' O> 0,
:-'
C) < r
0 •
v,
r_;
'·
i
T • " ~
,1
• MA c.c, iJ /Du:..,,~'/ • t<l:L:tlVl:U··
UNITE~ STAJ1a~NVIRONMENTAL PROTECTION AGENCY. u'-tt\~t\.l REGION IV f'\_.: 0 \';j':l.345 COU~TL..AND STR!:E:T. N.E. )UPERf/lNDSEtllON \t\ ;.\ \ l ATL-ANTA. GE:OFtGIA ::>031>5 " MAY 1 O 1993
4WD-N$RB su,~tt\~n~tt1\0l'
Mr. Dave Jones
Cla:rk Equipment
100 N. Michigan
South Bend, IN
Co,
St:reet
46634
RE1 Macon/Dockery Site
Cordova, NC
Dear Mr. Jones 1:
OPTIONAL FOr1M ?1 {7•9:>)
FAX TRANSMITTAL
1o
The Agency and the NC OEHNR have reviewed•. the Aquife:r Test Procedure that was submitted on April 29, 1993. Comments are attached. Satisfactory responses must be received and reviewed by the Agency PRIOR to beginning the aquifer test.
The request to specifically use PVC for the piezometers and the pumping well was previously approved via phone... This request was received on April 28, 1993; two working days prior to well lnatallation.
Please be advised that the Agency requires at least 30 calendar days for review of documents and requires notification of sampling activities· at least 14 calenda:r days in advance. Any further documents or requests submitted will be reviewed by this schedule. Therefore, it would be to your advantage to submit documents in a timely manner. Since the workplan was approved in January, there is no excuse why the above two documents could not have been submitted earlier. In.the future, work will have to STOP until the documents have been reviewed, revised and approved. In addition, no additional time will be added to the overall schedule.because of this lack of planning.
In addition, RMT is still not providing an accurate schedule of field activities. Please remember that the PRPs will be billed for all oversight activities. Inaccuracies cost both the Agency and the PRPs time and money. ·
If you have any questions, or would like to discuss this matter further, please feel free to give me a call,
i~lli:~>1.fYt,~~--
.Gie~elle s. Bennett
Remedial Project Manager
Printed on Rocycled P11per ,
• •
AQUIFER TEST COMMENTS
1. Page 2 -The firet: paragraph should give; an estimate of t;he depth of each piezometer and pumping well.
The reference to the ESD SOP has a typo,
2. As stated earlier, PVC is fine for the use specified in this document, However, EPA will not consider any sampling data that may come from these wells in the future,
3. Page 7 -The specifications for the submersible pump should be given. The document reports that the range for gw flow will be between 0,5 and 15 gpm. However, other calculations in this document (660 gal in 120 min) seem to indicate that the rate will be about 5 gal/min. . In addition, what backup measures will be taken if the data logger goes out? It is the Agency's understanding that Ground Water Technology no longer makes data loggers. This may cause undue delays.
4. The entire discharge sequence should be fully described and also shown on Figure 3 including sampling locations. The scenario now does not have any provisions for sampling or wate·r collection AFTER the treatment system. How will treatment be confirmed, and what will happen· to the water during the 12-hour sampling interval? The first sampling. event should occur l hour after treatment has begun before the' 12-hour interval starts,
5. The target discharge concentrations should also be specified.
l.
What will happen if the water is sampled and it is above the approved discharge limits?
STATE COMMENTS
Assure that the locations and depth are appropriate with regard to contamination.
of the aquifer test wells the vertical extent of
2. The top of the well screens should be located at or above the top of the water table.
3. Assure that well tags are used for identification purposes.
4. Page 5 referenced the North Carolina Administrative Co.de regarding well abandonment procedures. Note that there are · specific sections of this code concerning permitti~g and well construction that would apply to this aquifer test.
• • .J. '·-• • 5. .The procedure notes on Page 2 that Section 5. 3 of the FSAP will be followed regarding decontamination of the drill rig and sampling equipment. The next sentence indicates that "this" equipment will be decontaminated with materials specified in the ESDSOPQAM and lists the six step cleaning and rinsing process on Page 3. Thia six step process pertains only to sampling equipment however, this is not clear in the procedure, Sand blasting and steam cleaning is specifically noted in Section 5. 3 of the FSAP as part of the decontamination process for drilling equipment.
6. Page 8 of the procedure references Section 5.10;3 of the FSAP regarding the disposition of discharge water generated during the aquifer teat. This part of the FSAP includes provisions for disposal to a POTW under certain conditions. The procedure only has provisions for onsite disposal. Also, note that there may be some permitting requirements for disposal of the discharge water either onsite or via a POTW,
7. If only one aquifer test is conducted on this site, sufficient justification and rationale will need to be presented in the future to show that the results of the aquifer test can be applied to the entire site, This is especially important since this site la comprised of several areas that are not contiguous,
(.
• •
State of North Carolina
Department of Environment, Health, and Natural Resources
512 North Salisbury Street • Raleigh, North Carolina 27604
James B. Hunt, Jr., Governor
Ms. Giezelle Bennett
Remedial Project Manager
U.S. EPA Region IV
345 Courtland Street, N .E.
Atlanta, GA 30365
Division of Solid Waste Management
Telephone [phone]
May 7, 1993
SUBJECT: Review of Aquifer Test Procedure
Charlie Macon Lagoon and Drum Storage NPL Site
Cordova, Richmond County, North Carolina
Dear Ms. Bennett:
Jonathan B. Howes, Secreta,y
The referenced Aquifer Test Procedure has been received and reviewed by this
office. This document has also been forwarded to the NC Division of Environmental
Management for concurrent review. Their comments will be forwarded when available.
The following comments are offered by the North Carolina Superfund Section.
1. Assure that the locations and depth of the aquifer test wells are appropriate with
regard to the vertical extent of the contamination.
2. The top of the well screens should be located at or above the top of the water table.
3. Assure that well tags are used for identification purposes.
4. Page 5 references the North Carolina Administrative Code regarding well
abandonment procedures. Note that there are specific sections of this code
concerning permitting and well construction that would also apply to this aquifer test.
5. The procedure notes on Page 2 that Section 5.3 of the Field Sampling and Analysis
Plan (FSAP) will be followed regarding decontamination of the drill rig and sampling
equipment. The next sentence indicates that "this" equipment will be decontaminated
P.O. Box 276S7, Ra!t:igh, Non.h Carolina 2761!•7687 lClc:phom: 919.733.4934 Fax t 919•733-0513
An Equal Opportu;.iry Affirmative Action Employer
• • •
Mr. Giezelle Bennett
May 7, 1993
Page 2
with materials specified in the ESBSOPQAM and lists the six step cleaning and
rinsing process on Page 3. This six step process pertains only to sampling equipment
however, this is not clear in the procedure. Sand blasting and steam cleaning is
specifically noted in Section 5.3 of the FSAP as part of the decontamination process
for drilling equipment.
6. Page 8 of the procedure references Section 5.10.3 of the FSAP regarding the
disposition of discharge water generated during the aquifer test. This part of the
FSAP includes provisions for disposal to a POTW under certain conditions. The
procedure only has provisions for on-site disposal. Also, note that there may be
some permitting requirements for disposal of the discharge water either on-site or
via a POTW.
7. If only one aquifer test is conducted on this site, sufficient justification and rationale
will need to be presented in the future to show that the results of the aquifer test can
be applied to the entire site. This is especially important since this site is comprised
of several areas that are not contiguous.
The North Carolina Superfund Section appreciates the opportunity to review this
document. If you have any questions or would like to discuss the subject document, please
contact me at [phone].
Sincerely,
Patrick Watters
Environmental Engineer
Superfund Section
• • COPY
State of Nonh Carolina
Department of Environment, Health, and Natural Resources
512 North Salisbury Street • Raleigh, North Carolina 27604
James B. Hunt, Jr., Governor Divi~ion of Solid \Vas·tc Management
Telephone [phone]
Jonathan B. Howes, Secreta,y
TO:
FROM:
RE:
Arthur Mouberry, Chief
Groundwater Section
Division of Environmental Management
9~~ Patrick Watters
Environmental Engineer
NC Superfund Section
Aquifer Test Procedure
Charl'ie Macon Lagoon and Drum Storage NPL site
Cordova, Richmond County, North Carolina
The referenced site is currently in the Remedial Design phase
of activity. An aquifer test plan for this site has been prepared
by RMT Inc. and submitted for review (received on 4/30/93). It is
requested that this document be forwarded to the appropriate
sections of DEM with comments submitted to the NC Superfund
Section. The NC Superfund Section is currently reviewing this
document and should be responding to EPA Region IV on or before May
14, 1993. It is our desire to include the views and permitting
requirements of the Air Quality, Groundwater, and Water Quality
Sections of DEM.
If you or your staff have any questions, please do not
hesitate to call us at [phone].
cc/ Jack Butler
P.O Box 27667, R.ilt.:igh, Nortii Carolina 27611-76S7 Tclerhone 919-733-4984 Fax/: 91~-733-0513
An Eq,.1J] Oppomrniry Affirm.:itive Action Employer
P.O. Box1cA
Greenvll!e, S~
Phone: (603) 28\-0:)3()
Flv.: [phone]
KtGt\VtU
APR 3 () l:J'dJ • LETTER OF
TRANSMITTAL
_T_O_: --ff§---'-,; _fr~,-_c_l_'-_~l~'v~' -ft _11,_.,,_,_s ___ s.....,1 ........ 1PFRFUND SEtTIOt! NO: / C,) 0 I ) . 0 2, DA TE: 0 i"' /4 9./1 l
' REF: f:1oc,,,v dJ, ,: ,{.,-,, 7
/ /
ATTENTION:
WE ARE SENDING YOU: U Shop Drawings
U Samples
~Anached
U Prints U Plans U Computer Diskene
U Change Order U Specifications U Copy of Lener U Separate Cover Via _______________ _
QUAN. DRAWING NO. REV. DESCRIPTION
1 ;(} -k ----,-< 5 ,.,_ . MiA-/ , I' I I
/? t ror"...ec.-u/C...
.
•·
THESE ARE TRANSMITTED AS CHECKED BELOW:
U For Approval U Approved as submitted
U As requested U Approved as noted
U Returned for corrections
U Resubm~ for approval
U For review and comment
U Return corrected prints
kQ_ For your use
LJ FOR BIDS DUE_ 19_
U Returned after loan to RMT
MAGNETIC MEDIA IS PROVIDED AS A SERVICE ONLY AND NOT AS A DOCUMENTED DATA SYSTEM.
CLIENT ASSUMES FULL LIABILITY FOR USE, MODIFICATION, AND/OR DETERIORATION OF DATA
REMARKS:
DISTRIBUTION T FULL DISTRIBUTION T FULL
/ /'
SIGNED /-/(, /: /c-z1-z-t---?~
H. \l:ommc:ln\ \tom,1\XXXXX.L <-----" / I wp OT
• • AQUIFER TEST PROCEDURE
MACON/DOCKERY SITE
RMT, Inc. (RMT) has prepared this document which describes well installation and placement rationale, proposed test procedures, and anticipated schedule for site wori< related to an Aquifer Test at the Macon/Dockery Site. We propose mobilizing to the si1e to begin field activi1ies on May 3, 1993. Field activi1ies will include the following:
Drilling, installing, and developing one (1) recovery well and two (2) piezomelers which will be completed in borings drilled using mud rotary techniques.
Following installation of the recovery well and piezometers, these wells and appropriate existing site monitoring wells will be used lo conduct an aquifer test lasting up lo 60 hours. The aquifer test will be conducted in two parts: a step drawdown test and a continuous pumping-rate test. During the test interval, water level measurements will be collected over 48-hour pumping and 12-hour recovery periods.
Concurrent with the aquifer test, discharge water from the recovery _well will be sampled periodically and analyzed for the parameters and intervals specified listed later in this document.
Ground water wtthdrawn during the pump·,test·will· be treated on-site and discl1arged.
Following installalion·of the recovery well and'piezomelers, these new wells·will be surveyed relative to the Slate Plane Coordinate·System and mean sea level-(MSL) lo establish horizontal and vertical control prior·to beginning· aquifer testing.
RMT anticipates that well installation and development will· be completed in seven lo ten wori<ing days. The aquifer lest is scheduled to occur during the week of May 17, 1993. Figure 1 illustrates proposed well and piezometer locations.
PURPOSE
The purpose of this wori< will be lo assess the hydraulic characteristics (transmissivi1y, storage coefficient, and boundary condi1ions. etc.) of the site's suriicial aquifer to provide the basis for remedial design. The aquifer test data will be reduced using accepted standard methods to periorm capture zone analysis and lo formulate numerical flow and contaminant transport modeling. Modeling results will be used lo assist in developing and designing an intermediate and final si1e ground water withdrawal and treatment system.
l:\WP\70\7001700G.l TRlc:dt9J
• • WELL INSTALLATION
One (1) recovery well (UMRW01) and two (2) piezometers designated UMPZ01 and UMPZ02 will be
installed for the aqu~er test. Figure 1 illustrates proposed well locations. Well UMRW01 will be located
approximately 30 feet south south-east of existing she well pair MW02/MW02A. Piezometers UMPZ01
and UMPZ02 will be located 50 and 70 feet east nonh-east of location UMRW01, respectively. The
recovery well UMRW01 will be constructed of six-inch nominal, flush-joint type Schedule 40 PVC
screen and casing. The recovery well will be completed at or near the projected top of the bedrock
suriace (depending on drilling conditions), and will fully screen the observed saturated interval from the
water table to the top of bedrock suriace (or at a minimum, 80 percent of this saturated interval).
Piezometers UMPZ01 and UMPZ02 will each be constructed of two-inch nominal, flush-joint Schedule
40 PVC screen and casing. Depending on drilling conditions, each piezometer will be completed at or
near the projected top of bedrock suriace. Piezometers will fully scre~n the observed saturated interval
from the water table to the top of bedrock suriace (or at a minimum, 80 percent of this saturated
interval).
The purpose of each well is as follows:
Location UMRW01 will be a six-inch diameter Schedule 40 PVC well that will be outfitted whh a submersible pump and associated plumbing. Over the course of t11e pump test, a controlled flow of ground water,will be removed from the site's suriicial aquifer through well UMRW01. Ground·-water elevation measurements during pumping and recovery periods-will be collected and recorded from well UMRW01.
The piezometers designated UMPZ01 and UMPZ02 will be used to collect ground water elevation measurements from the site's suriicial aquifer during pumping and recovery periods. Locations UMPZ01 and UMPZ02 will be positioned to optimize, relai"lve to location UMRW01, the ground water elevation measurements collected for aquifer modeling. · ·
EQUIPMENT DECONTAMINATION
The drill rig and downhole tools, samplers, drill rods, and bits will be decontaminated prior to drilling
borings completed as piezometers and recovery wells. The drill rig and sampling equipment will be
decontaminated according to Section 5.3 of the Macon/Dockery She Field Sampling and Analysis Plan
(FSAP). This equipment will be decontaminated with materials specified in the ESBSOPOAM and
according to the following procedures:
1:IWP\70\7001708G.L TRlcd193 2
1 .
2.
3.
4.
5.
6.
• •
Clean with tap water and laboratory detergent using a brush. if necessary, to
remove particulate matter and surface films.
Rinse thoroughly with tap water.
Rinse thoroughly with deionized water.
Rinse twice with pesticide grade isopropanol.
Rinse thoroughly with organic-free water and allow to air dry.
Wrap with plastic or aluminum foil to minimize the possibility of contamination it
equipment is going to be stored or transported.
Water used for steam cleaning and drilling will be obtained from the on-site potable water source. This
water supply will be sampled and analyzed for the contaminants of concern (COCs) during the well
installation program.
Equipment decontamination will take place.on the decontamination pad. The pad is located so that
personnel and equipment entering the site will by-pass the pad, and personnel and equipment leaving
the site will pass through the decontamination pad. Spent decontamination fluids will be placed in 55-
gallon, steel drums, lsopropanol will-be collected separatelydrom the other-decontamination fluids-and
disposed of according to US EPA requirements. Decontamination fluids, other than isopropanol, will be
treated on-site based on the results of the ground water analyses and appropriately discharged.
DRILLING PROCEDURES
Drilling will be done using mud rotary techniques. Drilling fluids will be made up of potable water and
bentonite powder. The six-inch recovery well will be installed in a 10-inch borehole. The two-inch
piezometers will be installed in eight-inch boreholes. The settling pit will be covered during drilling
operations to reduce the possibility of contaminating the drilling fluid. Equipment such as hoses or tools
will not be placed in the settling pit if it may introduce contaminants into the drilling fluid. Drill cuttings
will be containerized and placed in labeled DOT-approved 55-gallon drums. Drill cuttings will be
analyzed for parameters as specified in Section 5.5.3 of the FSAP. Drill cuttings will be properly
disposed of depending on sample resuhs. Soil samples will be collected as specified below.
During drilling, soil samples will, at a minimum (it geologic conditions permit). be collected at five-foot
intervals for lithologic description. These samples will be used to develop a geologic log for the boring
t:\WP\70\7001705G.L TRlcd19J 3
• •
and to decide on the dept~ of well installation. Thin-walled tube or undisturbed samples may be
collected from each monitoring well boring. These undisturbed samples will be analyzed for bulk
density and effective porosity.
Samples collected for lithologic description will be logged by the field geologist, and stored in clean,
moisture-tight jars (minimum 8 oz. volume) or in sample bags as appropriate. Two jars or bags of soil
will be collected whenever possible. Field activities will be documented in a hard bound field notebook.
WELL INSTALLATION PROCEDURE
The recovery well (UMRW01) will be constructed of six-inch I.D., !lush-jointed Schedule 40 PVC screen
and casing. The piezometers will be constructed of two-inch I.D .. flush-jointed Schedule 40 PVC
screen and casing. No glues will be used in well construction. Wells will be installed so that the
screens will be set extending approximately from the water table surtace to the top of bedrock (or a
minimum 80 percent of this thickness). The recovery well will be constructed of wire-wrapped screen.
The piezometers will be constructed of machine-slotted PVC screens. On the basis of prior site
experience, a screen slot size of 0.01 O inch will be used. Table 1 is a summary of well construction
information. Well casing and screen materials will be steam-cleaned-and decontaminated prior to
installation according to the procedure outlined in Section 5.3 of the FSAP. During transport from the
decontamination area to well site. the materials will be wrapped in plastic and will remain wrapped until
ready for installation.
The annular space around the well screens will be packed with clean quartz sand having a grain size
appropriate to screen slot size (such as Foster-Dixiana FX-50 or an equivalent). A minimum ol six
inches of filter pack material will be placed under the bottom of the well screen to provide a firm footing
and unrestricted flow under the well screen. The sand pack will be emplaced by tremie pipe and will
extend approximately two feet above the top of the screen. If the top of the sand is less than 50 feet
below land surtace, the top of the sand pack will be sealed via the gravi1y method (dropped down the
annular space) with bentoni1e pellets. The bentonite pellets will be added a few at a time to minimize
the chance of bridging. If the top of the sand pack is greater than 50 feet below land sur1ace, tl1e
bentonite pellets will be placed via the tremie method. Minimum thickness of the bentonite seal will be
approximately two feet. Bentonite pellets will be allowed to hydrate for eight hours prior to addi1ion of
grout. The remaining annular space will then be grouted to approximately two feet below t11e land
surtace, from the bottom up using a cement bentonite grout slurry placed wi1h a tremie pipe. The
cement-bentonite grout slurry will be mixed using a ratio of 94 pounds of Portland cement, seven
gallons of water, and one to two pounds of bentonite. A three-foot by three-foot by six-inch thick
l:IWP\7017001708G.L TR·ccf93 4
• •
sloping concrete pad will be framed and poured around each well. The concrete pad will extend six
inches below the land surface whhin six inches of the borehole. A steel protective cover will be placed
over each well and secured in the grout column and/or concrete. Weep holes will be drilled through the
protective cover above the concrete pad. Each well will be locked. A typical well construction diagram
for wells installed in saprolhe is included on Figure 2.
I~ .•··•·· ··•·••··• ••• •·····•·•····•••·
fo~sE ... ii~: !if'
•··· > ''';
\ •,•
UMRW01 80
UMPZ01 80
UMPZ02 80
TABLE 1
SUMMARY OF WELL CONSTRUCTION INFORMATION
I •i, ··••·•·••·••
ii •·• . : . ~·:····
5 10 0.010 40
5 8 0.010 40
5 8 0.010 40
6-inch PVC
Sch. 40
2-inch PVC
Sch: 40
2-inch PVC
Sch. 40
Documentation of well installation is not dependent on the well design. The following will be recorded
in field notes:
the materials used· in construction;
length of well screen and casing installed;
deptt1 of surface casing, if used;
depth and diameter of borehole;
depth to the bot1om of the well;
height of well casing above ground;
depth. type. and thickness of sand pack, seals and backfill materials;
methods used to place seals and backtill materials;
depth to water table; and
any other factors or problems associated whh monitoring well installation.
In addition. well construction diagrams will be completed for each of the on-site monitoring wells.
Well abandonment. if required, would be accomplished in accordance whh the abandonment
procedures described in the Title 15A of the North Carolina Administrative Code, Subchapter 2C,
Section .0100, Well Construction Standards.
l:\WP,7017001708G L T:::Vedt93 5
• •
WELL DEVELOPMENT
Wells will be developed by pumping with a submersible pump or a positive displacement PVC pump,
PVC or Teflor® bailer, and/or a surge block until discharge is relatively clear and free of sediment.
The water generated during well development will be contained in labeled dnums and stored on-site
·pending appropriate disposition. Development water will be analyzed for COCs as described in Section
5.5.3 of the Macon/Dockery FSAP. Pending receipt of sample results, the development water will be
disposed in an appropriate manner.
SURVEYING
The recovery well and piezometer locations will be referenced to a locally established benchmari< and
surveyed relative to the State Plain Coordinate System and mean sea level (MSL). Elevations will be
determined for both the measuring point (top of casing) and land surlace for each well.
AOUIFERTESTAPPROACH
A submersible pump will be temporarily installed within recovery well UMRW01 and pumred at a
uniform pumping rate. The pump will then be shut-off'. and the recovery rate for the aquifer will be
evaluated. The total time-frame for this aquifer test is estimated at 60 hours. including both pumping
and recovery. Water quality samples will be collected•at:periodic intervals throughout the test.
The results of the aquifer test will be used to evaluate the aquifer's l1ydraulic characteristics (l1ydraulic ,.
conductivity, transmissivrty, storage coefficient, and aquifer thickness) so that the ground water flow
model can be developed. The ground water flow model and results from water qualrty testing
perlormed during the aquifer test will be used in the development of a ground water remediation system
for the Macon/Dockery Srte.
OBSERVATION WELLS
When conducting aquifer testing at recovery well UMRW01, eight (8) observation wells (including six (6)
existing site monitoring wells and the two (2) newly installed piezometers) will be used for obtaining
water level measurements as shown on Figure 1. These observation wells include the following:
1.IWPl70\7001708G.L TRlcd19J
UMPZ01
UMPZ02
MW02
MW02A
6
MW07
MW06
MW08
MW08A
• •
Up to five of the observation wells (UMPZ01, UMPZ02, MW02, MW02A, and MW07) will be outfitted
with pressure transducers to continuously monitor and record water level changes. Water levels in the
remaining observation wells (MW06, MW08, and MW08A) will be measured by manual methods.
WATER LEVEL MEASUREMENTS
Water level measurements will be obtained by using both a programmable data logger with transducers
and by manual methods. The data logger to be used is manufactured by Ground Water Technology,
Inc. The programmable recording equipment consists of the data logger (having eight channel -capacity with one transducer per channel), eight pressure transducers, a field printer, and two marine
batteries.
The pressure transducers for the data logger are available in a variety of pressure ranges. These
devices are used to monrtor the pressure changes t11at occur in the test well in response to the
drawdown induced by the pumping well. The pressure change in the well is directly proportional to the
net change in water level in the well over the linear range of the transducer and is measured in pounds
per square inch (psi).
For the Macon/Dockery Srte, three pressure ranges will be used, including: 5 psi, 15 psi, and 50 psi. A
pressure readinQ of one psi is equal to a 2.31 feet of water column. The 5 psi and 15 psi transducers
have the capacity to measure•a maximum water level change• of 11.6 feet and 34.6 feet, respectively·.
A 50 psi transducer will measure up to 115 feet of water level change. Tt1e pressure lransducer will be
appropriately calibrated prior to commencing the test. The resolution of these pressure measurements
is ,:t0.5 percent of full scale. The frequency of these measurements is discussed in the test procedures
section. Water level measurements will also be collected manually using electronic water level
indicators or steel tape.
PUMPING EQUIPMENT
The submersible pump installed in recovery well UMRW01 will be set to a depth approximately 5 feet
ott the bottom of the well. The recovery pump and tubing will be installed, maintained and operated by
RMT field personnel. RMT field personnel will be responsible for maintaining pumping rates such that
the pumping rate does not vary by more than ,:t10 percent of the set rate during the test procedure .
.The pump will be installed with a valve capable of controlling ground water flow in t11e range of 0.5 to
15 gallons per minute (gpm). The ground water discharge rate will be monrtored by a flow meter
l:IWPl70\7001708G.l TRlcxlf93 7
• •
capable of measuring flow with an accuracy of~ 0.1 gpm. This llow meter will also include a totalizer
to record the total flow during the aquifer test. Periodically, discharge from the pump will be measured
by timing the flow into a 5 gallon container. This will serve as a quality assurance check on the primary
flow metering device. The discharge water volume generated during these field activities will include
water from the step-drawdown test (about 660 gallons) and pump test (about 14,400 gallons).
GROUND WATER SAMPLING
Ground water samples from UMRW01 will be obtained prior to and at 12-hour intervals during the
aquifer test. The three to five samples will be analyzed tor the organic and inorganic COCs, total and
soluble iron (laboratory analysis with field filtration), total suspended solids (TSS), and hardness. Field
tests for alkalinity, specific conductance, pH, and temperature will also be pertormed. Samples will be
collected from the discharge pipe. Samples will be collected and analyzed according to the procedures
described in the Macon/Dockery Site FSAP.
PUMP TEST WATER CONTAINMENT
This discharge water generated during the aquifer test will'be collected: treated, and discharged<on-site
per Section 5.10.3 of the Macon/Dockery FSAP. Figure 3 is a schematic diagram of the proposed
aquifer test discharge water treatment process. Ground water pumped from the recovery well will be
discharged into a settling tank. A sump pump in the settling>tank•will then transfer the discharge water
through an in-line network of filters which will be used to process and treat the water. These filters will
include a cartridge filter to remove suspended solids, two "green" sand fitter units which-will remove
inorganic constituents, and two granulated activated carbon filter units which will remcve volatile and
semivolatile organic constituents. Based on site ground water sampling results, the proposed method
of water treatment will permit ·1he pump test water to be discharged on-site following treatment. The
treated water will be discharged downgradient of the MW02/02A well pair within the area of attected
ground water.
SCHEDULING
A pre-test meeting will be held with the project team to discuss the purpose and scope of the aquifer
test, data quality objectives, equipment operation and trouble shooting, aquifer test logistics, and field
data plotting requirements. This pre-test meeting will be held approximately one week prior to the
scheduled test.
l:\WP\70\7001700G.l TRlcdl93 8
• •
The aquifer test is scheduled to last for a period not to exceed 60 hours. The test will include 24 to 48
hours of pumping, followed by 12 hours of recovery. The specific length for the test will be contingent
upon the actual time required to reach equilibrium pumping conditions. Field generated test data will
be plotted and evaluated in the field to determine the ac1ual end point.
STAFFING
The aquifer test will be staffed by two RMT field representatives which will include at least one (1)
hydrogeologist and one ( 1) field technician. These RMT representatives will be responsible for
monitoring the aquifer test during 12-hour shifts during daylight and dark hours.
The RMT representatives will be responsible for overall per1ormance of the aquifer test. Tl1ey will
monitor the data logger, manually collect water levels from the selected wells, plot field data to evaluate
test conditions (e.g. delayed-yield conditions and test end-point). and ma·,ntain contact wit11 t11e Senior
Hydrogeologist in RMT's Greenville office to discuss test conditions and technical issues. They will also
assist in maintaining as constant a pumping rate as possible and ensuring that periodic measurements
of pumping rate are taken to calculate and record total. flow volumes.
AQUIFER TEST
The submersible pump will be checked:to ensure that·the pumping system is operational. The data
logger and pressure transducers will be hooked up and property calibrated.
The system configuration for the aquifer test is as follows:
Set up data logger and field printer at well UMRW01.
At well UMRW01 ·,nstall a 50 psi pressure transducer with a standard 75-foot cable.
At well MW07 install a 5 psi pressure transducer with a standard 50-foot cable and 150 feet of extension cable.
At well MW02 install a 15 psi pressure transducer with a standard 50-foot cable and 50
feet of extension cable.
At well MW02A install a 15 psi pressure transducer with a standard 50-foot cable and
50 feet of extension cable.
At piezometer UMPZ01 install a 15 psi pressure transducer with a standard 50-loot
cable and 150 feet of extension cable.
l:\WP\70',7001 70BG.L Tfilcdt9J 9
• •
At piezometer UMPZ02 install a 15 psi pressure transducer with a standard 50-foot
cable and 150 feet of extension cable.
A step drawdown test will first be periormed at the recovery well to determine the optimum pumping
rate for the aquifer test. Following completion of the step drawdown test, the pump will be shut down
and the water level in the well allowed to equilibrate.
Following well equilibration, the continuous pumping-rate test will be initiated. The pump discharge rate
will be set at the optimum pump rate derived during the step drawdown test. Adjustments to the
pumping rate will be made as frequently as required to maintain the desired pump test rate. However,
the pumping rate will not be allowed to deviate by more than± 1 0¾ of t11e optimum rate. Periodic
(every 3 hours) checks of the pump discharge will be made by measuring (timing) the flow into a 5
gallon pail.
Data logging/transducer measurements will be made at the following intervals_:
Test Stage Interval
Pre-Test 10 min.
Pumping and 15 sec.
Recovery 30 sec.
1 min.
10 min.
15 min.
30 min.
Duration
120 min.
15 min.
30 min.
60 min.
120 min.
360 min.
2280 min.
Test Time
2.00 hrs.
0.25 hrs.
0.50 hrs.
1.00 hr.
2.00 hrs.
6.00 hrs.
38.00 hrs.
Measurements/Channel,
12
60
60
60
12
24
76
RMT's data logger has a capacity 1or 12,000 discrete measurements. This capacity will not be
exceeded by the number of m·easurements required for this aquifer test.
Manual water level measurements will be obtained hourly for the duration of the pumping and recovery
activities. The field data and logging forms to be used during these tests are provided in Attachment A
of this document.
At the completion of the aquifer test, all test equipment will be turned off and removed from the wells.
All down-hole equipment and tubing will be decontaminated using a deionized water rinse.
t:\WP\70\7001700G.L TR/cdt93 10
I
/ ! ,
·_,;:> /.,,, .,,,-/ -~--_,_. :'L;.,,· , , ,, ·•'·•<.·-. /k:~;;~J<;J:~-\-;Xj~[);:; ;{/;//:: ~c/ /:/ ,;
·::/~:_ A :.,:_ ./,._''"f"'/ _,/
/;
''·~r r
i .-: ,.. ·:nr:
-. (..'= /j L /i.:'f };~:/ // > /
. --~ i./ .. : /; .:/ ,/ _/::·/?f{;;;t·\{'.'.:/--
M W -O ~ $, F0,:(0l! / '<(/' ' '
MW-03~
,; C !~fj1~~,,
MW.CJ 9~,,;;,; , '? ,;,; .·
I
70017.08
0493
·,
'"''·::/''::;,..'·
• .. -<>, •,,--A;f
0
'
/ ·'
MW-11~
100 200 300
SCALE IN FEET
/
;
/
/
_..,./· _/'/ _/ , ", . ; · ./o/ /,
/ ~; / ,/ l..JJ ! /
1--. / / ✓: / : , Q ; ' / '\Q-,: f ,
('',-· (~i / / f ,,,-...,
i I\~:.~
f f~~/"'A....._,,.,.?''••, / { ... ,
/
QUMRWOI
□ UMPZOI
4MW-06
LEGEND
PROPOSED RECOVERY WELL
PROPOSED PIEZOMETER
!=::.<!STING MONITORING WELL
FIGURE
PROPOSED RECOVERY WELL
AND PIEZOMETER
LOCATIONS
MACON/DOCKERY SITE
RICHMOND CO .. NORTH CAROLINA J
-------
• •
ATTACHMENT A· FIELD DATA FORMS
t:\WP\70'.700\ 700G.l TRlcrlt93
SUMltARY OF START-UP CONDITIOtlS FOR STEP DRAWDOWN AND PUMP TESTS TABLI
CUEtH NAME: ___________________ _ DATE: -----------------------
RltT JOB NO.: ___________________ _ PERSONNEL: ---------------------
• •
TABLE 2
SUMMARY OF MANUAL WATER LEVEL MEASUREMENTS
PROJECT NAME _________ _ WELL NO. ___________ _
RMT JOB NO. _________ _ TOP OF RISER _________ _
(mean sea level) DATE _______________ _
PERSONNEL ____________ _
MP -measuring point (top of riser)
l:\WP>.7(1,7'001700G.l TR!c:dt93
TABLE 3 •
SUMMARY OF MANUAL MEASUREMENTS OF DISCHARGE RATES (Q)
'ROJECT NAME: __________ _
'ROJECT NO.: __________ _
l:IWP,70-.70017C6G.L TR/cdl9J
Ir LOCKING STEEL PROTECTIVE COVER
/
VENTED CAP
...
---,,._, / CONCRCTE PAD WEEP HOLE~
~ LAND SURFACE
DEPTH (FT.)
0,0 ft, .•. o 5 if
. BOREHOLE ____ _
~-WELL CASING ___ _
BENTONITE SEAL--
FIGURE 2
WELL CONSTRUCTION DIAGRAM
Not To Scale
PROJECT ___________________ _
PROJECT NO. _________________ _
WELL NO., __________________ _
DATE INSTALLED ________________ _
DRILLING CONTRACTOR ______________ _
RMT GEOLOGIST_~---------------
FLOW
METER
SUMP
PUMP
SETTLING
TANK
•t---t1ECOVERY
WELL
ii---SUBMERSIBLE
PUMP
70017.08
0493
SUSPENDED SOLIDS
CARTRIDGE FILTER
GREEN SAND
FILTERS
FIGURE 3
GRANULATED ACTIVATED
CARBON FILTERS
AQUIFER TEST -PROPOSED DISCHARGE
WATER TREATMENT SCHEMATIC
NOT TO SCALE
MACON DOCKERY
RICHMOND COUNTY, NC
•
At piezometer UMPZ02 install a 15 psi pressure transducer with a standard 50-foot
cable and 150 feet of extension cable.
A step drawdown test will first be performed at the recovery well to determine the optimum pumping
rate for the aqutter test. Following completion of the step drawdown test, the pump will be shut down
and the water level in the well allowed to equilibrate.
Following well equilibration, the continuous pumping-rate test will be inttiated. The pump discharge rate
will be set at the optimum pump rate derived during the step drawdown test. Adjustments to the
pumping rate will be made as frequently as required to maintain the desired pump test rate. However,
the pumping rate will not be allowed to deviate by more than± 10% of the optimum rate. Periodic
(every 3 hours) checks of the pump discharge will be made by measuring (timing) the flow into a 5
gallon pail.
Data logging/transducer measurements will be made at the following intervals :
Test Stage Interval Duration Test Time Measurements/Channel
Pre-Test 10 min. 120 min. 2.00 hrs. 12
Pumping and 15 sec. 15 min. 0.25 hrs. 60
Recovery 30 sec. 30 min. 0.50 hrs. 60
1 min. 60 min. 1.00 hr. 60
10 min. 120 min. 2.00 hrs. 12
15 min. 360 min. 6.00 hrs. 24
30 min. 2280 min. 38.00 hrs. 76
RMT's data logger has a capactty for 12,000 discrete measurements. This capactty will not be
exceeded by the number of measurements required for this aqutter test.
Manual water level measurements will be obtained hourly for the duration of the pumping and recovery
activtties. The field data and logging forms to be used during these tests are provided in Attachment A
of this document.
At the completion of the aqutter test, all test equipment will be turned off and removed from the wells.
All down-hole equipment and tubing will be decontaminated using a deionized water rinse.
l:\WP\70\7001708G.L TR/cdt93 10
• TT
de maximi.s, inc.
9041 £xe-:ut1ve ?ark Dr.vc
Sw.!te 40!
Knoxv•Jlc:, TN 37923
[phone]
Fax [phone]
FAX TRANSMITTAL SHEET
RE:t;ttVl:.0
SUPERfUND SEtllON
Project/File Number: 3'ct8
· Date: ¼,/? J
This Fax consists of .S... page(s) including this cover sheet.
TO: ~H.ti.a/,:i_________,_/J,=.::/&;2.:.-s~_c...;¼:...:::.'C~-..£.~!::;jl,"~✓--'-=/J:.......!..e'.:£:~,,,_.J_:::!::.::::=.-__ _
TELECOP!ER NUMBER: _..._9._l_,__f_-_· ..... 7=3_]_,___-'-_· -'-0'£~½_1/ _______ _
FROM: _......s~~~---l.~:::::-~~~:ef-________ __:__
Please call (6"15) 691-5052 if t
Number 615 591-6485}
REMARKS;
are any problems with this transmission (FAX
Unless ct-,erwisa iri::::fr:~:ec'. -:-io intcr:·:1~~or. cor:~r,e,c' :n :.hi::. f~:=:::irnile r.1~::.ge is privileged. ar.d :~r.fidenti.!! ir,lcrrnatlor.
ir.:er.ded 1or ~e :....:se :-:' the ini:!ivld:..:al or ent:ty r,~ed ~ovia, lf ':"le read~ ol ~is message i'$ net -:.--.e intended rec!oient or t'"',e
em~!oy~ er ai;~rrt respon:::ibie ~c l!ti!iivar ;~ ~c -:-.~ i,.,:"r.Ce<:: red:cier,t. you are hereby r.otif.ec· ':;;a: ar.y C:isserr.inu.ticn. dist"ibl:'jcl"'.,
or copying of -:ii~ cornrrn,;nication i~ ~t"ic~y pre~1bire--:', 11 yot..: :lave (e,ceivec' ,-.is c~mmunicejcn in error or ere not i:;ure wne:f-:~r
It i's privilegec· .. ::i!ease irr.:-:iec'iate!y r.cc'fy ~s by !eiepi':cne, e.r.d des:.--oy a.JI cc.oie~ e.nc' re~r:, :he oric;in=.1 messege to us e.t tr\e
above cd:::ress vio: !i:e ~.S. P~s-:a.i Serviee at our exoi::?nse.
F1le:t4.'dcrm. ~s \.:: s
'1!='F.' 3i:J ':'3 11: 1·=:~i,·1 !..i:.. i'1M/ . .!.f·i1'=·
.~~/29/93 08:12 'B'803 281 0288 ?... H. T. GVL. SC . • su~ON
P.0, 8<»<16778
~.;Jie.SC~
Pr>ont,; 003-28 H)030
FAX: 8Q3-281-0288
April 28, 1993
7 V Pl 7 f)'i,'
Post~lt"" brand fax 1ransminat merno 7'571 '01 ~0• " 1'
Ms. Glezelle Berman
Remedlal Project Manager
Urilled suaes ErMronmen!lll Protection Agancy
S4S Courtland St., N.E.
Allanla,GA 30385
SUBJECT: Mocon/Oockery Site
Pumping Well Mater1als d Construction
Dear Ms. Bennett:
,.., /..,,-
On l>8haJf cl the MacorVDockery PAP Steering Commlnee, RMT la requesting yo1,1r consideration or
PVC es the material ol construcilon for the one pumping weU and two plezomsters to ba IM!alled lot
the purp0118 of conducting the aquller test at too Macon/Docke,y Site.
The pk)wmeters are to bo two (2') lncl'\as In ale.meter and will be Installed to obtain water levels
durtngth818$t.
The pumping well wlll be eoostrucled of elx (6') Inch dlameler material. Thl9 well wm be sampled
periodically during trte test pt,>rlod 10 dmermine the trend In constlwent (COCs) COflC8f'lt(atiOns.
n Is recommended Iha! both the piezomet8111 and the pumping well ba =nstructod of PVC materiQJ
(Sclledule 40 / slot Size -o.010j becaus6 of thO low Jo,vels of volatl16 organic compounds (VCCs) and
meta1a encountered In !he recent sampling effon for those walls (},K'N02 and MW<Y1A) nearest th&
proposed pumping well, The prellmlnafy laboralory anaty\lcal rooulta lor these wells are attached.
Toe COCs aetec:tea, partlCUlatly the voes, are In th;:, low pans-per-ollllon (ppb) concentr1>1lons.
Those con<;OOtratioos will not effect the mate<lal'a lntegrl'ly nor should the materials c:A coostructfon
allect tho oampla t811Ult8 from tll8 test.
Additional rauonllkl substantlallng the use ol PVC Is as follows;
1, The sampling Is for dlacharg&. compUance;
2. PVC ls more durable over eXIended periods Q.e., -years) since &talnless steel Is
eusceptlble to gaMltllc corrosion;
3. PVC sloll.9'1 screens llf& not M susceptible to corrosion and mlneral,lblologlcal fouling
.... wire-wrapped stalnlass steel.
s,.:~~~,,_~
Engineering and Env,ronmenlal Managemenr Se,vices
nFR 38
· 0-l/'.<9/93 08:12 'B803 281 0288
M$. Cillezele Bennett
Ajlril 28, 1993
Page 2
• •
Therefore, the Technleal committee Of the PAP Group requests us EPA approval of PVC materials for
the pumping well and the plezometen1. Due to the planned Installation of these Items during the .,,,.,..k
<I. May 3, 1993, your prompt. review and approval will be graally apprecleled, Please advise me or
Mark Peumnann <I. AMT (803/281-0030) of your decision,
SI~,
RMT, Inc.
SOOiOI' Project Manager
Attachmonts
Dist; PRP Technical Committee
Mr. Tom Daggett -lelter on},/
Mr. Tom Owlnil • letter only
Mr. Mark Plllemlalln
AF1,"< 38 '93 iJ.;2.uH:q Ut.,!"!rir<~,,-~-
·i:i--l ... ·Z9/93 08: 13 "fi'803 :!81 028.'.3
RMT, Inc.
DATE:
TO:
FROM:
SU8JECT:
•
April 26, 1993
Charles Rowan
Ellllbell! Popp
Preliminary Results for M•u:on Oockery
Project Number 70017.08
EPA Noe.: MW02_, MW2A_
•
INTEROFFICE MEMORANDUM
Anatyte ~ Oatecifor, Limit
EPA Number: MW02 : -
Cyanide 1.00 10
Mercury 0.16 0.2
Antimony -2.1 60
Lead 0.S6 3.0
Nickel -8.43 40
Manganese 36.6 15
Beryllium -0.17 5
Cadmium -3.94 5
Barium 73.97 200
Iron 1528.75 100
Iron, dissolved 1500
Chromium -0.12 10
Vanadium 2.57 50
Zinc 18.14 20
li:PA Number: MW2A_:
Cyanide 4.00 10
Mercury -0.03 0.2
Antimony 0.4 60
Lead 3.6 3.0
NICl<el "'31,89 40
Menganase 205.67 15
Beryllium 0.17 5
.· ·#~ Cadmium -4.23 5
Barium 1n.e9 200
Iron 7541.57 . 100
Iron, dissolved 7SOO /.;• Chromium :3.72 10
Vanadium 10.99 50
Zinc 48.26 20 ,~~~
Hr:"-,:wJ ::,.:, i _ t'.'.11_\t ,; _;~,.
:·~•J.•"28...-93 •~~: l 3 ";.,":~!}!f ;;Bl 011:!3 • •
Preliminary Aoaulta MW02/MW02A
Concentration w.u Compound (ppb)
MW02 VOA 1, 1-Dlchloroett'IOne .6
1,2-Dichloroathen& 2
Trlchloro8thene 10
$VOA lsophorone BDL
MW02.A VOA Camon DLsulfide 8
1, 1-DlchloroeU\ene 6
1, 1-DicP'lloroethano 2
1,2-Dlchloroethane 2
1, 1, 1-TriChl0roethane .5
Trichloroethane 17
T etrachloroethem1, · ,,4
$VOA lsophoron& · BDL
flL t : f\AA(.oi-J {) c<.~ '(
P. 0. Box 16. ~{Sft"!Sl\UA°f':.il'i \\ &
Greenvllle, S. C. 29606 U-\\6\Yb\l'\J~\Y' W,
Phone: [phone]R 3 n l':fJJ
FAX: [phone] Mf" \J
LETTER OF
TRANSMITTAL
\
_T_O_: +A-' ,'--;f._,'--/c_h_~ut..,~'-nf!-,_~_~_s ___ $11ffRfUNDSlt~=·m~q~~· N_O_:~--=--,--D_AT_E~:0...,.1'~2-+q,~~~
ATTENTION:
WE ARE SENDING YOU: U Shop Drawings
U Samples
Q9. Attached
QUAN. DRAWING NO.
:J_ 1LZ = u ; I< ,,-T<' s f-
/ i-".-r o, --e ,,f u ,l"<C_
·-
.
REF:
U Prints U Plans
U Specifications U Copy of Letter
U Computer Diskette
U Change Order U Separate Cover Via ______________ _
REV. DESCRIPTION
THESE ARE TRANSMITTED AS CHECKED BELOW:
U For Approval U Approved as submitted
U As requested U Approved as noted
U Returned for corrections
U Resubmtt for approval U For review and comment
U Return corrected prints
QS)_ For your use U FOR BIDS DUE_ 19_
U Returned alter loan to RMT
MAGNETIC MEDIA IS PROVIDED AS A SERVICE ONLY AND NOT AS A DOCUMENTED DATA SYSTEM.
CLIENT ASSUMES FULL LIABILITY FOR USE, MODIFICATION, AND/OR DETERIORATION OF DATA.
REMARKS:
DISTRIBUTION T FULL DISTRIBUTION T FULL
/ /l
SIGNED ~:/{~//4 -
H:\dabl\common\ Vorm1\XXXXX.LOT wp
• •
AQUIFER TEST PROCEDURE
MACON/DOCKERY SITE
AMT, Inc. (AMT) has prepared this document which describes well installation and placement rationale,
proposed test procedures, and anticipated schedule for site work related to an Aqutter Test at the
Macon/Dockery Site. We propose mobilizing to the stte to begin field activtties on May 3, 1993. Field
activtties will include the following:
Drilling, installing, and developing one (1) recovery well and two (2) piezometers which
will be completed in borings drilled using mud rotary techniques.
Following installation of the recovery well and piezometers, these wells and appropriate
existing site monitoring wells will be used to conduct an aquifer test lasting up to 60
hours. The aquifer test will be conducted in two parts: a step drawdown test and a
continuous pumping-rate test. During the test interval, water level measurements will
be collected over 48-hour pumping and 12-hour recovery periods.
Concurrent with the aqutter test, discharge water from the recovery well will be sampled
periodically and analyzed for the parameters and intervals specttied listed later in this
document.
Ground water wtthdrawn during the pump test will be treated on-site and discharged.
Following installation of the recovery well and piezometers, these new wells will be
surveyed relative to the State Plane Coordinate System and mean sea level (MSL) to
establish horizontal and vertical control prior to beginning aqutter testing.
AMT anticipates that well installation and development will be completed in seven to ten working days.
The aqutter test is scheduled to occur during the week of May 17, 1993. Figure 1 illustrates proposed
well and piezometer locations.
PURPOSE
The purpose of this work will be to assess the hydraulic characteristics (transmissivtty, storage
coefficient, and boundary condttions, etc.) of the site's surficial aqutter to provide the basis for remedial
design. The aqutter test data will be reduced using accepted standard methods to perform capture
zone analysis and to formulate numerical flow and contaminant transport modeling. Modeling results
will be used to assist in developing and designing an intermediate and final stte ground water
withdrawal and treatment system.
l:\WP.70\7001708G.L TR/cdt93 1
• •
WELL INSTALLATION
One (1) recovery well (UMRW01) and two (2) piezometers designated UMPZ01 and UMPZ02 will be
installed for the aqutter test. Figure 1 illustrates proposed well locations. Well UMRW01 will be located
approximately 30 feet south south-east of existing stte well pair MW02/MW02A. Piezometers UMPZ01
and UMPZ02 will be located 50 and 70 feet east north-east of location UMRW01, respectively. The
recovery well UMRW01 will be constructed of six-inch nominal, flush-joint type Schedule 40 PVC
screen and casing. The recovery well will be completed at or near the projected top of the bedrock
surface (depending on drilling conditions), and will fully screen the observed saturated interval from the
water table to the top of bedrock surface (or at a minimum, 80 percent of this saturated interval).
Piezometers UMPZ01 and UMPZ02 will each be constructed of two-inch nominal, flush-joint Schedule
40 PVC screen and casing. Depending on drilling conditions, each piezometer will be completed at or
near the projected top of bedrock surface. Piezometers will fully screen the observed saturated interval
from the water table to the top of bedrock surtace (or at a minimum, 80 percent of this saturated
interval).
The purpose of each well is as follows:
Location UMRW01 will be a six-inch diameter Schedule 40 PVC well that will be
outfitted wtth a submersible pump and associated plumbing. Over the course of the
pump test, a controlled flow of ground water will be removed from the stte·s surficial
aquifer through well UMRW01. Ground water elevation measurements during pumping
and recovery periods will be collected and recorded from well UMRW01.
The piezometers designated UMPZ01 and UMPZ02 will be used to collect ground water
elevation measurements from the site's surficial aquifer during pumping and recovery
periods. Locations UMPZ01 and UMPZ02 will be positioned to optimize, relative to
location UMRW01, the ground water elevation measurements collected for aquifei
modeling.
EQUIPMENT DECONTAMINATION
The drill rig and downhole tools, samplers, drill rods,. and btts will be decontaminated prior to drilling
borings completed as piezometers and recovery wells. The drill rig and sampling equipment will be
decontaminated according to Section 5.3 of the Macon/Dockery Site Field Sampling and Analysis Plan
(FSAP). This equipment will be decontaminated with materials specified in the ESBSOPQAM and
according to the following procedures:
1:IWPl70\7001708G.l TRlcdf93 2
1.
2.
3.
4.
5.
6.
• •
Clean with tap water and laboratory detergent using a brush, if necessary, ·to
remove particulate matter and surtace films.
Rinse thoroughly with tap water.
Rinse thoroughly with deionized water.
Rinse twice with pesticide grade isopropanol.
Rinse thoroughly with organic-free water and allow to air dry.
Wrap with plastic or aluminum foil to minimize the possibility of contamination tt
equipment is going to be stored or transported.
Water used for steam cleaning and drilling will be obtained from the on-site potable water source. This
water supply will be sampled and analyzed for the contaminants of concern (COCs) during the well
installation program.
Equipment decontamination will take place on the decontamination pad. The pad is located so that
personnel and equipment entering the site will by-pass the pad, and personnel and equipment leaving
the site will pass through the decontamination pad. Spent decontamination fluids will be placed in 55-
gallon, steel drums, lsopropanol will be collected separately from the other decontamination fluids and
disposed of according to US EPA requirements. Decontamination fluids, other than isopropanol, will be
treated on-site based on the results of the ground water analyses and appropriately discharged.
DRILLING PROCEDURES
Drilling will be done using mud rotary techniques. Drilling fluids will be made up of potable water and
bentonite powder. The six-inch recovery well will be installed in a 10-inch borehole. The two-inch
piezometers will be installed in eight-inch boreholes. The settling pit will be covered during drilling
operations to reduce the possibility of contaminating the drilling fluid. Equipment such as hoses or tools
will not be placed in the settling pit if it may introduce contaminants into the drilling fluid. Drill cuttings
will be containerized and placed in labeled DOT-approved 55-gallon drums. Drill cuttings will be
analyzed for parameters as specified in Section 5.5.3 of the FSAP. Drill cuttings will be properly
disposed of depending on sample results. Soil samples will be collected as specified below.
During drilling, soil samples will, at a minimum (tt geologic conditions permit), be collected at five-foot
intervals for lithologic description. These samples will be used to develop a geologic log for the boring
l:\WP\70\7001708G.l TR.lcdf93 3
• •
and to decide on the depth of well installation. Thin-walled tube or undisturbed samples may be
collected from each monitoring well boring. These undisturbed samples will be analyzed for bulk
density and effective porosity.
Samples collected for llthologic description will be logged by the field geologist, and stored in clean,
moisture-tight jars (minimum 8 oz. volume) or in sample bags as appropriate. Two jars or bags of soil
will be collected whenever possible. Field activities will be documented in a hard bound field notebook.
WELL INSTALLATION PROCEDURE
The recovery well (UMRW01) will be constructed of six-inch I.D., flush-jointed Schedule 40 PVC screen
and casing. The piezometers will be constructed of two-inch I.D., flush-jointed Schedule 40 PVC
screen and casing. No glues will be used in well construction. Wells will be installed so that the
screens will be set extending approximately from the water table surtace to the top of bedrock (or a
minimum 80 percent of this thickness). The recovery well will be constructed of wire-wrapped screen.
The piezometers will be constructed of machine-slotted PVC screens. On the basis of prior site
experience, a screen slot size of 0.01 O inch will be used. Table 1 is a summary of well construction
information. Well casing and screen materials will be steam cleaned and decontaminated prior to
installation according to the procedure outlined in Section 5.3 of the FSAP. During transport from the
decontamination area to well site, the materials will be wrapped in plastic and will remain wrapped until
ready for installation.
The annular space around the well screens will be packed with clean quartz sand having a grain size
appropriate to screen slot size (such as Foster-Dixiana FX-50 or an equivalent). A minimum of six
inches of filter pack material will be placed under the bottom of the well screen to provide a firm footing
and unrestricted flow under the well screen. The sand pack will be emplaced by tremie pipe and will
extend approximately two feet above the top of the screen. If the top of the sand is less than 50 feet
below land surtace, the top of the sand pack will be sealed via the gravity method (dropped down the
annular space) with bentonlte pellets. The bentonite pellets will be added a few at a time to minimize
the chance of bridging. If the top of the sand pack is greater than 50 feet below land surtace, the
bentonlte pellets will be placed via the tremie method. Minimum thickness of the bentonlte seal will be
approximately two feet. Bentonlte pellets will be allowed to hydrate for eight hours prior to addition of
grout. The remaining annular space will then be grouted to approximately two feet below the land
surtace, from the bottom up using a cement bentonlte grout slurry placed with a tremie pipe. The
cement-bentonlte grout slurry will be mixed using a ratio of 94 pounds of Portland cement, seven
gallons of water, and one to two pounds of bentonlte. A three-foot by three-foot by six-inch thick
I.\WP\70\7001706G.L TR/cdf93 4
• •
sloping concrete pad will be framed and poured around each well. The concrete pad will extend six
inches below the land surface wtthin six inches of the borehole. A steel protective cover will be placed
over each well and secured in the grout column and/or concrete. Weep holes will be drilled through the
protective cover above the concrete pad. Each well will be locked. A typical well construction diagram
for wells installed in saproltte is included on Figure 2.
TABLE 1
SUMMARY OF WELL CONSTRUCTION INFORMATION
UMRW01 80 5 10 0.010 40 6-inch PVC
Sch. 40
UMPZ01 80 5 8 0.010 40 2-inch PVC
Sch. 40
UMPZ02 80 5 8 0.010 40 2-inch PVC
Sch. 40
Documentation of well installation is not dependent on the well design. The following will be recorded
in field notes:
the materials used in construction;
length of well screen and casing installed;
depth of surface casing, tt used;
depth and diameter of borehole;
depth to the bottom of the well;
height of well casing above ground;
depth, type, and thickness of sand pack, seals and backfill materials;
methods used to place seals and backfill materials;
depth to water table; and
any other factors or problems associated with monitoring well installation.
In addition, well construction diagrams will be completed for each of the on-site monitoring wells.
Well abandonment, tt required, would be accomplished in accordance with the abandonment
procedures described in the Title 1 SA of the North Carolina Administrative Code, Subchapter 2C,
Section .0100, Well Construction Standards.
l:\WPl70\7001708G.L TR/cd!93 5
•
WELL DEVELOPMENT
Wells will be developed by pumping with a submersible pump or a posttive displacement PVC pump,
PVC or Teflon® bailer, and/or a surge block until discharge is relatively clear and free of sediment.
The water generated during well development will be contained in labeled drums and stored on-site
pending appropriate disposttion. Development water will be analyzed for COCs as described in Section
5.5.3 of the Macon/Dockery FSAP. Pending receipt of sample results, the development water will be
disposed in an appropriate manner.
SURVEYING
The recovery well and piezometer locations will be referenced to a locally established benchmark and
surveyed relative to the State Plain Coordinate System and mean sea level (MSL). Elevations will be
determined for both the measuring point (top of casing) and land suriace for each well.
AQUIFER TEST APPROACH
A submersible pump will be temporarily installed within recovery well UMRW01 and pumped at a
unttorm pumping rate. The pump will then be shut-off and the recovery rate for the aqutter will be
evaluated. The total time-frame for this aqutter test is estimated at 60 hours, including both pumping
and recovery. Water quality samples will be collected at periodic intervals throughout the test.
The results of the aquifer test will be used to evaluate the aqutter's hydraulic characteristics (hydraulic
conductivtty, transmissivtty, storage coefficient, and aquifer thickness) so that the ground water flow
model can be developed. The ground water flow model and resutts from water qualtty testing
performed during the aquifer test will be used in the development of a ground water remediation system
for the Macon/Dockery Stte.
OBSERVATION WELLS
When conducting aqutter testing at recovery well UMRW01, eight (8) observation wells (including six (6)
existing site monitoring wells and the two (2) newly installed piezometers) will be used for obtaining
water level measurements as shown on Figure 1. These observation wells include the following:
t:\WP\70\70017080.L TR/odf93
UMPZ01 MW07
UMPZ02
MW02
MW02A
6
MW06
MW08
MW08A
• •
Up to five of the observation wells (UMPZ01, UMPZ02, MW02, MW02A, and MW07) will be outfitted
with pressure transducers to continuously monitor and record water level changes. Water levels in the
remaining observation wells (MW06, MW08, and MW08A) will be measured by manual methods.
WATER LEVEL MEASUREMENTS
Water level measurements will be obtained by using both a programmable data logger wtth transducers
and by manual methods. The data logger to be used is manufactured by Ground Water Technology,
Inc. The programmable recording equipment consists of the data logger (having eight channel
capacity with one transducer per channel), eight pressure transducers, a field printer, and two marine
batteries.
The pressure transducers for the data logger are available in a variety of pressure ranges. These
devices are used to monttor the pressure changes that occur in the test well in response to the
drawdown induced by the pumping well. The pressure change in the well is directly proportional to the
net change in water level in the well over the linear range of the transducer and is measured in pounds
per square inch (psi).
For the Macon/Dockery Stte, three pressure ranges will be used, including: 5 psi, 15 psi, and 50 psi. A
pressure reading of one psi is equal to a 2.31 feet of water column. The 5 psi and 15 psi transducers
have the capactty to measure a maximum water level change of 11.6 feet and 34.6 feet, respectively.
A 50 psi transducer will measure up to 115 feet of water level change. The pressure transducer will be
appropriately calibrated prior to commencing the test. The resolution of these pressure measurements
is _±0.5 percent of full scale. The frequency of these measurements is discussed in the test procedures
section. Water level measurements will also be collected manually using electronic water level
indicators or steel tape.
PUMPING EQUIPMENT
The submersible pump installed in recovery well UMRW01 will be set to a depth approximately 5 feet
off the bottom of the well. The recovery pump and tubing will be installed, maintained and operated by
RMT field personnel. RMT field personnel will be responsible for maintaining pumping rates such that
the pumping rate does not vary by more than _±10 percent of the set rate during the test procedure.
The pump will be installed with a valve capable of controlling ground water flow in the range of 0.5 to
15 gallons per minute (gpm). The ground water discharge rate will be monttored by a flow meter
l:\WP\7017001700G.L TR/cdl93 7
•
capable of measuring flow wtth an accuracy of.± 0.1 gpm. This flow meter will also include a totalizer
to record the total flow during the aqutter test. Periodically, discharge from the pump will be measured
by timing the flow into a 5 gallon container. This will serve as a quality assurance check on the primary
flow metering device. The discharge water volume generated during these field activities will include
water from the step-drawdown test {about 660 gallons) and pump test {about 14,400 gallons).
GROUND WATER SAMPLING
Ground water samples from UMRW01 will be obtained prior to and at 12-hour intervals during the
aqutter test. The three to five samples will be analyzed for the organic and inorganic COCs, total and
soluble iron {laboratory analysis with field filtration), total suspended solids {TSS), and hardness. Field
tests for alkalinity, specttic conductance, pH, and temperature will also be performed. Samples will be
collected from the discharge pipe. Samples will be collected and analyzed according to the procedures
described in the Macon/Dockery Site FSAP.
PUMP TEST WATER CONTAINMENT
This discharge water generated during the aquifer test will be collected, treated, and discharged on-site
per Section 5.10.3 of the Macon/Dockery FSAP. Figure 3 is a schematic diagram of the proposed
aqutter test discharge water treatment process. Ground water pumped from the recovery well will be
discharged into a settling tank. A sump pump in the settling tank will then transfer the discharge water
through an in-line network of filters which will be used to process and treat the water. These filters will
include a cartridge filter to remove suspended solids, two "green" sand filter units which will remove
inorganic constttuents, and two granulated activated carbon filter untts which will remove volatile and
semivolatile organic constttuents .. Based on stte ground water sampling results, the proposed method
of water treatment will permit the pump test water to be discharged on-stte following treatment. The
treated water will be discharged downgradient of the MW02/02A well pair within the area of affected
ground water.
SCHEDULING
A pre-test meeting will be held wtth the project team to discuss the purpose and scope of the aqutter
test. data quality objectives, equipment operation and trouble shooting, aquifer test logistics, and field
data plotting requirements. This pre-test meeting will be held approximately one week prior to the
scheduled test.
l:\WPl7f/\7001708G,l TR/cdt93 8
• •
The aquifer test is scheduled to last for a period not to exceed 60 hours. The test will include 24 to 48
hours of pumping, followed by 12 hours of recovery. The specttic length for the test will be contingent
upon the actual time required to reach equilibrium pumping condttions. Field generated test data will
be plotted and evaluated in the field to determine the actual end point.
STAFFING
The aqutter test will be staffed by two RMT field representatives which will include at least one (1)
hydrogeologist and one (1) field technician. These RMT representatives will be responsible for
monitoring the aqutter test during 12-hour shifts during daylight and dark hours.
The RMT representatives will be responsible for overall pertormance of the aqutter test. They will
monitor the data logger, manually collect water levels from the selected wells, plot field data to evaluate
test condttions (e.g. delayed-yield condttions and test end-point), and maintain contact wtth the Senior
Hydrogeologist in RMT's Greenville office to discuss test condttions and technical issues. They will also
assist in maintaining as constant a pumping rate as possible and ensuring that periodic measurements
of pumping rate are taken to calculate and record total flow volumes.
AQUIFER TEST
The submersible pump will be checked to ensure that the pumping system is operational. The data
logger and pressure transducers will be hooked up and property calibrated.
The system configuration for the aqutter test is as follows:
Set up data logger and field printer at well UMRW01.
At well UMRW01 install a 50 psi pressure transducer wtth a standard 75-foot cable.
At well MW07 install a 5 psi pressure transducer wtth a standard SO-foot cable and 150
feet of extension cable.
At well MW02 install a 15 psi pressure transducer wtth a standard SO-foot cable and 50
feet of extension cable.
At well MW02A install a 15 psi pressure transducer wtth a standard SO-foot cable and
50 feet of extension cable.
At piezometer UMPZ01 install a 15 psi pressure transducer with a standard SO-foot
cable and 150 feet of extension cable.
1:IWP\70\700170BG.L TR/cdf93 9
! !
!
' ,
i
! I j / / t;; ! ! ,'/ / s>
< ; j
J J / I : ! /
j . .I
!
i
! ' i
70017.08
0493
' ; i ' '
f
/
/
/
/ /
0 1)0 200 300
SCALE IN FEET
/
/
QUMRWOI
□ UMPZOI
♦MW-06
LEGEND
PROPOSED RECOVERY WELL
PROPOSED PIEZOMETER
EXISTING MONITORING WELL
FIGURE
PROPOSED RECOVERY WELL
AND PIEZOMETER
LOCATIONS
MACON/DOCKERY SITE
RICHMOND CO., NORTH CAROLINA
•
ATTACHMENT A· FIELD DATA FORMS
t:\W~70\700170BG.L TR/aff93
SUMMARY OF START-UP CONDITIONS FOR STEP DRAWDOWN AND PUMP TESTS
CUENTNAME: _________________ _
RMT JOB NO.: _________________ _
![~llllLt\11111,!{!11!: li~I J••••>:: :::::;
1iii'i½All!E$ilv$.1i~:HilliiiimIJ;j;iWf H
TABLE 1
DATE: _____________________ _
PERSONNEL: _________________ _
I ___ __JL,_ __ L,_ __ L,_ __ _,_ __ __JL,_ __ ...J.... __ __J ___ _1,_ __ _l. ___ .L_ __ ...... __ --11
I.\Wfl\70\70017080 L TA/cdf93
• •
TABLE 2
SUMMARY OF MANUAL WATER LEVEL MEASUREMENTS
PROJECT NAME ________ _ WELL NO. ___________ _
RMT JOB NO. _________ _ TOP OF RISER _________ _
(mean sea level) DATE _______________ _
PERSONNEL ____________ _
MP -measuring point (top of riser)
1:\WP\70\70017C8G.l TR/c:dt93
TABLE 3 •
SUMMARY OF MANUAL MEASUREMENTS OF DISCHARGE RATES (Q)
PROJECT NAME: _________ _
PROJECT NO.: ----------
l:\WPi.70\70017()36. L TRfcdl93
• LOCKING STEEL PROTECTIVE COVER
CAP
WEEP HOLE~
CONCRETE PAD
LAND SURFACE
DEPTH (FT.) .....
BOREHOLE-----
--WELL CASING, ___ _
FIGURE 2
WELL CONSTRUCTION DIAGRAM
Nol To Scale
PROJECT ___________________ _
PROJECT NO. _________________ _
WELL NO. __________________ _
DATE INSTALLED ________________ _
DRILLING CONTRACTOR _____________ _
Rt.AT GEOLOGIST ________________ _
!lfMI-
SUMP
PUMP
SETTLING
TANK
--ttECOVERY
WELL
~--SUBMERSIBLE
PUMP
70017.08
0493
SUSPENDED SOLIDS
CARTRIDGE FILTER .
GREEN SAND
FILTERS
FIGURE 3
GRANULATED ACTIVATED
CARBON FILTERS
AQUIFER TEST -PROPOSED DISCHARGE
WATER TREATMENT SCHEMATIC
NOT TO SCALE
MACON DOCKERY
RICHMOND COUNTY, NC