NCD003200383_20080421_Koppers Co. Inc._FRBCERCLA RA_Semiannual Groundwater Monitoring 2004 - 2008-OCR

FTS Field & Technical Services
200 Third Avenue • Carnegie, PA 15106 • Phone: [phone] • Fax: [phone]
April 21, 2008
Ms. Beverly Stepter
Remedial Project Manager
Supcrfund Remedial Site Evaluation Branch
U.S. Environmental Protection Agency, Region 4
Sam Nunn -Atlanta Federal Center
6 I Forsyth Street, I I th Floor
Atlanta, GA 30303
RE: 2007 Second Semiannual Groundwater Monitoring Report Response to Comments
Former Koppers Industries, Inc. NPL Site
Morrisville, Wake County, North Carolina
Dear Ms. Stepter,
On behalf of Beazer East, Inc. (Beazer), Field & Technical Services, LLC (FTS) hereby submits
this response to the comments made by the Superfund Section of the North Carolina Department
of Environment and Natural Resources (NCDENR), as presented in their April 7, 2008 letter to
the U.S. Environmental Protection Agency, Region 4.
Figures 2 and 3, the subject of comments by NCDENR, have been corrected so that the data
presented on the figures is in accordance with the data presented in Table 1 of the report
referenced above. The revised figures have been attached for your reference.
If you have any questions regarding this submittal, please contact Angie Gatchie of FTS at ( 412)
429-2694 or Michael Tisehuk, Beazer Environmental Manager at [phone].
Sincerely,
Field & Technical Services, LLC
Angie Gatchie
Project Scientist
Attachments
ll
FTS
• • 2007 Second Semiannual Groundwater Afonitoring Report Response to Comments
Former Koppers Industries, Inc. NFL Site
Morrisville. Wake Countv. North Carolina
Figures 2 & 3
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LEGEND
_,,,_C02A
T 351.89
MONrTORING WELL
AND GROUNDWATER ELEVATION
... PW-O1 PUMPING WELL
NM NOT MEASURED
RAILROAD TRACKS
FENCELINE
DRANAGE/STREAM
PROPERlY BOUNDARY BEAZER
EAST, INC.
PROPERlY BOUNDARY -UNIT
STRUCTURES INC.
PROPERlY BOUNDARY -UNKNOWN
350-----GROUND WATER CONTOUR
5' INTERVAL
0 450
BEAZER EAST, INC.
900
FEET
PITTSBURGH, PENNSYLVANIA
a«o: R1iB OAT£: 01/22/tl!I Fla.D & TEa-lNIC>L. ORWN: au 0,t,TE: 01,'2:2/tll!S ■
..WO: .1SZ OAT£: 01/'Zl/08 ~~ A~t.E = DA.TE: AS 9-t;MI EI§ CAANEGIE. PA 15106
FORMER KOPPERS COMPANY
RAI..ElGH SITT:
HIGHWAY 5-4 WEST
MORRISVIUE, NORTH CAROLINA
2007 SECOND SEMI-ANNUAL GROUND WATER MONITORING REPORT
COt-rTOUR MAP -A ZONE
Plll].l£CTNC:~ --FIGURE 2
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MONITORING WELL
AND GROUNDWATER ELEVATION
.PW-01 PUMPING WELL
NM NOT MEASURED
RAILROAD TRACKS
FENCEUNE
DRAINAGE/STREAM
· - - · - - · -PROPERTY BOUNDARY -BEAZER
EAST, INC.
350-----
0
PROPERTY BOUNDARY -UNfT
STRUCTURES INC.
PROPERTY BOUNDARY -UNKNOWN
GROUND WATER CONTOUR 5' INTERVAL
450
BEAZER EAST, INC.
900
FEIT
PITTSBURGH, PENNSYLVANIA
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FORMER KOPPERS COMPANY
RAJ..ElGH Snt
HIGHWAY 54 WEST
MORRISVILLE, NORTH CAROLINA
2007 SECOND SEMI-ANNUAL. GROUND
WATER MONITORING REPORT
CONTOUR WP -8 ZONE
f"AOJECT NO: OWOOJD07 --FIGURE 3
• ..:;;&;;;;::;;;7ih •
NCDENR
North Carolina Department of Environment and Natural Resources
Dexter R. Matthews, Director
Ms. Beverly Stepter
Remedial Project Manager
Division of Waste Management
April 7, 2008
Superfund Remedial Site Evaluation Branch
U. S. Environmental Protection Agency, Region 4
Sam Nunn -Atlanta Federal Center
61 Forsyth Street, 11 th Floor
Atlanta, GA 30303
RE: 2007 Second Semiannual Groundwater Monitoring Report
Former Koppers Industries, Inc. NPL Site
Morrisville, Wake County, North Carolina
Dear Ms. Stepter:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
· The Superfund Section of the North Carolina Department of Environment and Natural
Resources (NC DENR) has received and reviewed the 2007 Second Semiannual
Groundwater Monitoring Report for the Former Koppers Industries, Inc. National
Priority List (NPL) Site. The Superfund Section offers the following attached comments.
The NC DENR Superfund Section appreciates the opportunity to comment on this
document. If you have any questions or comments, please feel free to contact me at (919)
508-8466.
Sincerely,
<P~Z!f~
David B. Mattison
Environmental Engineer
NC Superfund Section
cc: Mr. Michael Tischuk, Beazer East, Inc
Attachment
1646 Mail Service Center, Raleigh, North Carolina 27699-1646
Phone [phone] \ FAX [phone]\ Internet http://wastenotnc.org
An Equal Opportunity/ Affirmative Action Employer-Printed on Dual Purpose Recycled Paper
• Ms. Beverly Stepter
Former Koppers Industries, Inc. NPL Site
2007 Second Semiannual Groundwater Monitoring Report
April 7, 2008
Page I
•
2007 SECOND SEMIANNUAL GROUNDWATER MONITORING REPORT
FORMER KOPPERS INDUSTRIES, INC. NPL SITE
Figure 2 Contour Map -A Zone
1. In accordance with the data presented in Table I, please correct Figure 2 to
indicate that the groundwater level was observed to be 353.50 feet above mean
sea level ( ft ams!) at monitoring well C-1 OA. Please correct this oversight.
Figure 3 Contour Map - B Zone
2. In accordance with the data presented in Table I, please correct Figure 3 to
indicate that the groundwater level was observed to be 359.40 ft ams! at
monitoring well C-28B. Please correct this oversight.
• 0
FTS Field & Technical Services
200 Third Avenue • Carnegie, PA l 5106 • Phone: [phone] • Fax: [phone] l 2
April 4, 2007
Mr. David B. Mattison
Environmental Engineer
North Carolina Supcrfund Section
1646 Mail Service Center
Raleigh, NC 27699-1646
Ms. Beverly Stepter
Remedial Project Manager
Superfund Remedial Site Evaluation Branch
U.S. Environmental Protection Agency, Region 4
Sam Nunn -Atlanta Federal Center
61 Forsyth Street
Atlanta, GA 30303
RE: Beazer East, Inc. Responses to NCDENR Comments
2006 Second Semiannual Groundwater Monitoring Report
Former Koppers Industries, Inc. NPL Site
Morrisville, Wake County, North Carolina
Dear Mr. Mattison and Ms. Stepter:
On behalf of Beazer East, Inc. (Beazer), Field & Technical Services, LLC (FTS) hereby submits
the following responses to comments from the Superfund Section of the North Carolina
Department of Environment and Natural Resources (NCDENR), dated January 4, 2007,
regarding the 2006 Second Semiannual Groundwater Monitoring Report for the Former Koppers
Industries, Inc. National Priority List (NPL) Site. The comments were addressed to Ms. Beverly
Stepter of the United States Environmental Protection Agency (USEPA), Region 4 and were
copied to Beazer.
For case of reference, NCDENR's comments arc repeated verbatim below in italics followed by
Beazer's response thereto.
NC Comment I:
This report indicates that groundwater monitoring wells C-3A and C-38 were paved
over. Please provide details. including a schedule, for properly locating and
rehabilitating or abandoning groundwater monitoring wells C-3A and C-38. All work
" F'TS
•
Response to Comments -2"d SA 2006 Groundwater Report
Mr. David Mattison and Ms. Beverly Stepter
April 4, 2007
Page2
must be completed in accordance with applicable North Carolina well construction and
abandonment statutes.
Beazer Response to Comment I:
The approximate location of the off-site wells is known; once access to the wells has
been obtained, the overlying surface cover in the vicinity of the wells will be removed to
facilitate well abandonment. FTS will proceed with well abandonment activities, within
two weeks of obtaining off-site access. The wells will be abandoned by trcmic grouting a
neat cement slurry from the base of the well to ground surface and removing the flush
mount protective covers. Once the slurry has cured, the wells will be covered with a thin
layer of topsoil prior to recovering the area. Work will be completed by a North
Carolina certified driller in accordance with applicable North Carolina well abandonment
requirements.
NC Comment 2:
This report indicates that the detection of dioxinlfuran congeners in the groundwater
sample collectedfi-om monitoring well C-/4A is attributed to "suspended.fine grained
(siltlclar) particles entrained in the aqueous sample." Please detail the methods used to
collect these groundwater samples, including the use of low:flow techniques. Please
provide the data collected during the course of sample co/lee/ion, specifically the results
of turbidity monitoring.
Beazer Response to Comment 2:
A copy of the groundwater sample collection record for well C-14A is attached. The
volume of water in the well at the time of purging and sampling was approximately 0.24
gallons. This equated to approximately I .45 feet of standing water in the well. The
method used to collect the sample was by removal of three well volumes via dedicated
Teflon® bailer. This sampling method is in compliance with the requirements of the
Proposed Remedial Action Groundwater Monitoring Program (ThermoRetec, August
1999), as modified per email correspondence from Mr. David Mattison to Beverly
Hudson, dated June 23, 2003, in which Beazer's request for the replacement of stainless
steel bailers with dedicated Teflon® bailers was approved.
Note that while turbidity was not measured, the sampling technician noted that the
sample appeared a "turbid muddy (brown) color." The well went dry after removal of
three liters and then was allowed to recharge prior to sampling. Based upon the limited
amount of standing water in the well, low-flow sampling techniques are not feasible at
well C-14A.
•
Response to Comme/1/s -2nd SA 2006 Groundwater Report
Mr. David Mattison and Ms. Beverly Stepter
April 4. 2007
Page]
Closing
On behalf of Beazer, FTS believes that this response will be sufficient to address the comments
that you have made. If you have any further comments, or desire additional infomiation, please
do not hesitate to contact me at ( 412) 429-2694.
Sincerely,
Field & Technical Services, LLC
Karen Fromme
Senior Scientist
cc: M. Tischuk -Beazer
M. Brounnan -Beazer
J. Abraham -GcoTrans
I]
FTS
• Response to Comments -2nd SA 2006 Groundwater Report
Mr. David Mallison and Ms. Beverly Stepler
April 4. 2007
Page 4
Attachment
Groundwater Sample Collection Record for Well C-14A
~
FTS
• JI.\IENVIRONMENTA!. ~liil'NOOAPQRAm, IWELLNO.:
GROUNDWATER SAMPLE COLLECTION RECORD
Project No.: 053006-091 Date: _7_!J~l_l0_6 _____ _
Project Name: BEAZER/ RALEIGH
Time: Start:
Finish:
/t(-:.(5 ·
/((.,"'f-()
am/pm
am/pm
Location: RALEIGH, NC -----~--"'====.::...._--------~----------------l Weather Conditions: .St,,11v ho' Collector: ,;),:-,4h1 ----"'="+--""---------Print Si£n
1. WATER LEVEL DATA (measured from top of well casing)
a. Total Casing Length: :,> () ~'-\ (ft) b. Well Casing Type: V~ (_,
Conversion Factors (cf)
(excf•f)
-------''----Casing I.D. (in) Coov. Fact
c. Depth to Water: c;)_ 'f,. Y, '\ (ft) d. Casing Diameter: ~ (in) -----0.041
e. Length of Water Column: ------''"-·-'_f_'.•_:; __ (ft) (a-c) !) 0.163
f. Well Volume: --~·"-·~-;I~'/_· __ (gal) 3 0.367
2. WELLPURGEDATA 4 0.653
a. Purge Method: HAND BAIL ---------------------6 1.470
b. Field Testing Equipment: OAKTON I PH-CON I 0
c. Number of Well Volumes to Remove: 3 --------------
d. Required Total Purge Volume (lf x 2c): -~C=J--',.~/4=0~-______ _
Vol. Purged Temp pH Spec. Cond.
(total gal) ( 0 (, ) (s.u.) ( /.,! 1 ) NOTES ...-·
0,)'I { )-{) 1-,-/)_(,, I,, V
/. ,,,, /
O.so i ''),r; 7 (/j ;, '2:S).. V
0.75··· I lf.'} --..-v. }. ) I ' -, , ,,.,.,.,,
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3. SAMPLE COLLECTION INFORMATION
Sampling Method(s): DEDICATED TEFLON BAILER ----------c---..C...C--,------'--~-'--=----------S amp I e Identification (name, time, date): -----'l~' _· \'-c\~t-_ . .=;; 3=-"''-'-·-1...,, \~;1__,L\\.,_:>--'i,'-, _______________ _
QC Samples (oamc, time, date): '-., i'-t; 40 ---------''------------------------
Analytical Parameters
and Methods:
ACID-EXTRACTABLE ORGANIC PHENOLS/ 8270C SIM
V . ,J
u:\\users\andy swllles\RALEIGH SAMPLE FORM Form #15 07/16199
;;;:;&=~iih
NCDENR
North Carolina Department of Environment and Natural Resources
Dexter R. Matthews, Director
Ms. Beverly Stepter
Remedial Project Manager
Division of Waste Management
July 18, 2006
Superfund Remedial Site Evaluation Branch
U. S. Environmental Protection Agency, Region 4
Sam Nunn -Atlanta Federal Center
61 Forsyt~ Street
Atlanta, GA 30303
RE: 2006 First Semiannual Groundwater Monitoring Report ·
Former Koppers Industries, Inc. NPL Site
Morrisville, Wake County, North Carolina
Dear Ms. Stepter:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
The Superfund Section of the North Carolina Department of Environment and Natural
Resomces (NC DENR) has received and reviewed the 2006 First Semiannual
Groundwater Monitoring Report for the Former Koppers Industries, Inc. National
Priority List (NPL) Site. The Superfund Section offers the following comments.
2006 First Semiannual Groundwater Monitoring Report
Former Koppers Industries, Inc. NPL Site
1. The groundwater elevations given in Table 1 do not agree with the groundwater
elevations given in Figures 2, 3 and 4. Please correct these discrepancies.
2. · Please revise the Summary of Historical Groundwater Analytical Results,
submitted as Appendix B in the subject document, to include the values of
Toxicity Equivalent Quotient (TEQ) given for those samples offered for
dioxins/furans analysis.
1646 Mail Service Center, Raleigh, North Carolina 27699-1646
Phone [phone] \ FAX [phone] \ Internet http://wastenotnc.org
An Equal Opportunity f Affirn1ative Action Employer-Printed on Dual Purpose Recycled Paper
Ms. Beverly Stepter
Page 2
•
The NC DENR Superfund Section appreciates the opportunity to comment on this
document. If you have any questions or comments, please feel free to contact me at (919)
508-8466.
Sincerely,
D~r:::;-~at:sontrlaftiJVv/ d r
Environmental Engineer
NC Superfund Section
cc: Mr. Michael Tischuk, Beazer East, Inc
• &~·':'?fA -;~~ ----NCDENR
North Carolina Department of Environment and Natural Resources
Dexter R Matthews, Director
Ms. Beverly Stepter
Remedial Project Manager
Division of Waste Management
December 13, 2005
Superfund Remedial Site Evaluation Branch
U. S. Environmental Protection Agency, Region 4
Sam Nunn -Atlanta Federal Center
61 Forsyth S tree!
Atlanta, GA 30303
RE: 2005 Second Semiannual Groundwater Monitoring Report
Former Koppers Industries, Inc. NPL Site
Morrisville, Wake County, North Carolina
Dear Ms. Stepter:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
The Superfund Section of the North Carolina Department of Environment and Natural Resources (NC
DENR) has received and reviewed the 2005 Second Semiannual Groundwater Monitoring Report for the
Former Koppers Industries, Inc. National Priority List (NPL) Site. The Superfund Section offers the
following comment.
2005 Second Semiannual Groundwater Monitoring Report
Former Koppers Industries, Inc. NPL Site
1. In future.groundwater monitoring reports, please revise the Summary of Historical Groundwater
·Analytical Results, submitted as Appendix B in the subject document, to include the values of
Toxicity Equivalent Quotient (TEQ) given for those samples offered for dioxins/furans analysis.
The NC DENR Superfund Section appreciates the opportunity to comment on this document. If you have
any questions or comments, please feel free to contact me at [phone].
Sincerely,
,Qi.uid_ 15 '1Ylatlestn-J/ df'
David B. Mattison
Environmental Engineer
· NC Superfund Section
cc: Mr. Michael Helbling, Beazer East, Inc.
1646 Mail Service Center, Raleigh, North Carolina 27699-1646
Phone [phone] I FAX [phone] I Internet http://wastenotnc.org
An Equal Opportunity/ Affirmative Action Employer-Printed on Dual Purpose Recycled Paper
Letter of Transmittal
The RETEC Group, Inc.
1822 Eas1 NC Highway 54
Suite 100
Durham, NC 27713
.RETEC
919.484. 2200 Phone
919.484. 8100 fax
www.retec.com
TO: -=-D"-avc..:e:..:M=a1"-ti:.::so::.:nc:___________ DA TE: 12/8/05
RE:
Second Semiannual 2005 TIN Contoured
Groundwater Potentiometric Surface Maps PROJECT NO:
PLEASE FIND: [8J Attached D Under separate cover via:
D Copy of Letter D Change Order D Drawings/Figures D Plans/Specs
D Samples D Other:
Copies Date No. Description
I 12/8/05 Second Semiannual 2005 TIN Contoured
Groundwater Potentiometric Surface Maps
D For Approval D Approved as Submitted D Resubmit
D Submit
D Return
D Other:
___ Copies for Approval
___ Copies for Distribution
___ Corrected Prints
[8J For Your Use D Approved as Noted
D As Requested D Returned for Corrections
D For Review & Comment
Remarks:
Should you have any questions, please feel free to call me.
Sincerely,
The RETEC Group, Inc.
cc w/enclosures: M. Helbling-Beazer cc w/o enclosures: B. Hudson-USEPA
R. Bauer-RETEC
M. Westray-RETEC
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DATE: 11 /1 5/05 0RWN: BcV/CON
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*NOTE:
LEGEND
GROUNDWATER MONITORING WELL
WITH WATER ELEVATION DATA,n1Msci
NOT MEASURED
COMPUTER GENERATED (TIN)
GROUNDWATER ELEVATION
CONTOURS
WELLS C01B AND ClOB WERE NOT
USED TO GENERATE CONTOURS
200· 0 400' ----GRAPHIC SCALE: 1"-400'
B-ZONE GROUNDWATER CONTOURS
2005 SECOND SEMIANNUAL
TIN CONTOURS
FIGURE B
C21C 1>
331.01
'-'332
-$-C16C
· 352.17
FORMER KOPPERS COMPANY
MORRISVILLE, NORTH CAROLINA
BEAZ?-03624-103
OATE: 11 /15/05 ORWN: Bev /CON
+ID
LEGEND
GROUNDWATER MONITORING WELL
WITH WATER ELEVATION DATA1nMu
COMPUTER GENERATED (TIN)
GROUNDWATER ELEVATION
CONTOURS
200· 400'
..-ii-
GRAPHIC SCALE, 1"-400'
C-ZONE GROUNDWATER CONTOURS
2005 SECOND SEMIANNUAL
TIN CONTOURS
FIGURE C
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MORRISVILLE, NORTH CAROLINA
BEAll--03624-103
DAE: 11/i5/05 O~WN: BcV/CON
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/
0
LEGEND
GROUNDWATER MONITORING WELL
WITH WATER ELEVATION DATA<nfMsc>
NOT MEASURED
COMPUTER GENERA TED (TIN)
GROUNDWATER ELEVATION
CONTOURS
~
200' 0 400'
GRAPHIC SCALE, 1"~400'
A-ZONE GROUNDWATER CONTOURS
2005 SECOND SEMIANNUAL
TIN CONTOURS
FIGURE A
• /(o P()'YS-(;t.J ,I
The RETEC Group, Inc.
1822 East NC Highway 54
Suite 100
Durham, NC 27713
Letter of Transmittal REJEC
919.484. 2200 Phone ., ' 919.484. 8100 fax
www.retec.com
TO: Dave Manison DATE: I 1/17/04 ----------------Second Semiannual 2004 TIN Conlourcd
RE: Groundwater Po1cntiometric Surface Maps PROJECT NO:
PLEASE FIND: 1:8] Attached D Under separate cover via:
Copies
I
D Copy of Letter
D Samples
Date
I 1/17/04
D Change Order D Drawings/Figures D Plans/Specs
D Other:
No. Descriotion
Second Semiannual 2004 TIN Contoured
Groundwater Potcntiomctric Surface Maps
D For Approval
1:8] For Your Use
D As Requested
D Approved as Submitted
D Approved as Noted
D Resubmit
D Submrt
D Return
D Other:
___ Copies for Approval
___ Copies for Distribution
Corrected Prints D Returned for Corrections ---
D For Review & Comment
Remarks:
Should you have any questions, please feel free to call me.
Sincerely,
The RETEC Group, Inc.
cc w/enclosures: M. Helbling-Beazer cc w/o enclosures: B. Hudson-USEPA
R. Baucr-RETEC
M. Westray-RETEC
•
Letter of Transmittal
TO:
RE:
Dave Mattison
First Semiannual 2004 TIN Contoured
Groundwater Potentiometric Surface Maps
• The RETEC Group, Inc.
1822 East NC Highway 54
Suite 100
Durham, NC 27713
. lg© ~-RETEC
JUL O 1 2004 H91l\ 2200 Phone
919.484. 8100 Fax • ---:::-:::::www.retec.com
SUL-PE-RF-UB.Qi~.CllONj
DATE: -=.:.6/=c29"-/0'-'4'------------
PROJECT NO:
PLEASE FIND: [8J Attached D Under separate cover via:
D Copy of Letter D Change Order D Drawings/Figures D Plans/Specs
D Samples D Other:
Cooies Date No. Description
I 6/29/04 First Semiannual 2004 TIN Contoured
Groundwater Potentiometric Surface Maos
D For Approval D Approved as Submitted D Resubmit
D Submit
D Return
D Other:
Copies for Approval
Copies for Distribution
Corrected Prints
[8J For Your Use D Approved as Noted
D As Requested D Returned for Corrections
D For Review & Comment
Remarks:
Should you have any questions, please feel free to call me.
Sincerely,
The RETEC Group, Inc.
cc w enc esur cc w/o enclosures: B. Hudson-USEPA
R. Bauer-RETEC
M. Westray-RETEC
• •
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LEGEND
GROUNDWATER MONITORING WELL
WITH WATER ELEVATION DATA,~;,sci
COMPUTER GENERATED (TIN)
GROUNDWATER ELEVATION
CONTOUR
200· ~
0 400'
GRAPHIC SCALE: 1 "=¼00'
A-ZONE GROUNDWATER CONTOURS
2004 FIRST SEMIANNUAL
TIN CONTOURS
·"' c:.____ ____ ----,--__________ ____E!2~~~c====t======~~ OME, •/09/200• °'""' BcV/CON FIGURE A
FORMER KOPPERS COMPANY
MORRISVILLE, NORTH CAROLINA
BEAZ?-03624-103
•
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'NOTE:
I EG"ND
GROUNDWATER MONITORING WELL
WITH WATER ELEVATION DAT.~1c.;vsc>
COMPUTER GENERATED (TIN)
GROUNDWATER ELEVATION
CONTOUR
WELLS COlB AND C108 WERE NOT
USED TO GENERATE CONTOURS
/
~
200' 0 4QQ'
~
GRAPHIC SCALE: 1 "=400'
B-ZONE GROUNDWATER CONTOURS
2004 FIRST SEMIANNUAL
TIN CONTOURS
-~ c::.___ ___________________ ~~~~~=r=====r========:r:.@Q]~=:j DATE: 4/09/2004 □Rwt-:c BcV/C0N FIGURE B
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· 349.21
FORMER KOPPERS COMPANY
MORRISVILLE, NORTH CAROLINA
BEAZ?-03624-103
LEGEND
GROUNDWATER MONITORING WELL
WITH W~.TER ELEVATION DATA1n1•sc>
COMPUTER GE,~ERATED (TIN)
GROU~IDWATER ELEVATION
CONTOUR
~
0 400'
GRAPHIC SCALE· 1 "=c4QQ'
-_\s-c22c
\ \ 3~2.33
C-ZONE GROUNDWATER CONTOURS
2004 FIRST SEMIANNUAL
TIN CONTOURS
'-----------------------------------------------------------------~
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