HomeMy WebLinkAboutItem K February 14, 2000
STAFF REPORT
To: Mayor Yost and Members of the City Council
Attention: Keith R. Till, City Manager
From: Lee Whittenberg, Director of Development Services
Subject: CITY RESPONSE LETTER RE: "DRAFT - WORK
PLAN FOR LONG-TERM GROUNDWATER
MONITORING AT INSTALLATION
RESTORATION SITES 40 and 70, NAVAL
WEAPONS STATION, SEAL BEACH"
SUMMARY OF REQUEST
Authorize the Mayor to sign the draft response letter, with any additional comments determined
appropriate. Receive and File Staff Report.
DISCUSSION
The Department of the Navy is requesting comments on the "Draft Work Plan for Long-Tenn
Groundwater Monitoring at Installation Restoration Sites 40 and 70, Naval Weapons Station,
Seal Beach" by February 19, 2000.
Review by Environmental Quality Control Board:
The Environmental Quality Control Board (EQCB) reviewed this matter on January 26, 2000, and
authorized the Vice-Chairman to sign the letter, with some non-substantive revisions. The matter
is now before the City Council for final review and authorization for the Mayor to sign the
comment letter also.
AGENDA ITEM /—N,
C:1My Documents WAVWPSTA\Draft Groundwater Work Plan, ER Sites 40&70.CC.doc\LW\01-27-00
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beach
City Council Staff Report
February 14, 2000
Overview of Work Plan:
This Work Plan provides the framework and guidance to conduct groundwater monitoring at the
subject Installation Restoration (IR) Sites. The groundwater monitoring program will involve
installing 15 new monitoring wells, monitoring groundwater surface elevations, and collecting
groundwater samples for analysis from 28 selected wells. The duration of the monitoring
program is 5 years. After 5 years, recommendations will be made to continue monitoring, reduce
the sampling frequency, or discontinue monitoring.
Previous investigations have identified the presence of chlorinated solvents in groundwater at IR
Sites 40 and 70. The extent of contamination has been delineated, and a feasibility study is
currently being conducted under a separate scope of work to evaluate remedial alternatives. The
monitoring program is designed to measure chemical concentrations within and around the
chlorinated solvent plume over time. The data will be used to establish contaminant concentration
trends, assess the effectiveness of remedial actions, when implemented, monitor for natural
attenuation of the chemicals of concern, and assess whether downgradient receptors have the
potential to become affected by the contaminant plumes. In addition, metals were reported in
groundwater at IR Site 70. The extent of mercury concentrations above statistical background and
hexavalent chromium concentrations above the detection limit was not fully delineated during
previous investigations. Further delineation of these metals will be performed as part of the
groundwater monitoring program.
IR Site 40
IR Site 40 includes a concrete gravel pit located in the Locomotive Shop (Building 240) and a
gravel area located north of and adjacent to the building. During previous investigations, a
volatile organic compound (VOC) plume consisting primarily of tetrachloroethene (PCE) and
trichloroethene (TCE) was identified in groundwater. The VOC plume extends several
hundred feet downgradient of the source area(s) and is generally limited in extent to
approximately 66 feet below ground surface (bgs). Please refer to Figure 2-1, Well Locations
and Extent of VOC Plume in Groundwater, IR Site 40, page 2-3, provided as Attachment 3.
IR Site 70
IR Site 70 consists of multistory office and production buildings, asphalt-paved parking areas, an
assortment of aboveground tanks and attendant above- and below-ground piping distribution
systems, several concrete-lined sumps, and underground storage tanks. During previous
investigations, a VOC plume was delineated and extends approximately 2,400 feet downgradient
of the presumed source area. An area proximate to the presumed source area is suspected to
contain dense nonaqueous-phase liquid (DNAPL) in dispersed droplet and/or ganglia form.
Draft Groundwater Work Plan, IR Sites 40&70.CC 2
City Response Letter re.•Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sues 40 and 70, Naval Weapons Station, Seal Beath
City Council Stuff Report
February 14, 2000
Dissolved contamination extends to a depth of approximately 195 feet bgs. At 195 feet, a
continuous clay layer has been mapped and is presumed to act as a barrier for further downward
migration of contamination. Please refer to Figure 2-2, Well Locations and Extent of VOC
Plume in Groundwater, IR Site 70, page 2-5, provided as Attachment 4.
A copy of the complete document was not provided to the EQCB or City Council due to the
length of the document, 263 pages. Staff provided the "Summary", "Table of Contents", and
Section 3 - "Monitoring Objectives and Rationale", to the EQCB and City Council for review in
considering this matter. Given some of the issues raised in the document, staff has prepared a
draft comment letter for the review and approval of the EQCB and the City Council. The draft
comment letter is provided as Attachment 1.
Previous City Review
The City has commented on IR Sites 40 and 70 as indicated below:
a On December 13, 1999, the City Council commented on the "Draft - Groundwater
Feasibility Study Report, Installation Restoration Sites 40 And 70, Naval Weapons Station,
Seal Beach", with the EQCB reviewing the document on November 24, 1999.
o In June 1999, the City commented on a request by the California Department of Toxic
Substances Control regarding "Request for Identification of Applicable and Appropriate
Requirements (ARARs): Feasibility Study at IR Sites 40 and 70, Naval Weapons Station".
❑ In February 1999, the City commented on the "Draft Extended Removal Site Evaluation
Report, IR Sites 40 and 70, Naval Weapons Station, Seal Beach".
o In February 1997, the City commented on the "Pre-Final Extended Removal Site
Evaluation Work Plan, IR Sites 40 and 70, Naval Weapons Station, Seal Beach".
Proposed Response Letter
The Navy is requesting comments on the subject document by February 19, 2000. Staff has
prepared the initial draft of the response letter for consideration by the EQCB and ultimately the
City Council, indicating general concerns of the City (See Attachment 1). As indicated above, the
EQCB has reviewed the comment letter and authorized the Vice-Chairman to sign the letter with
several non-substantive revisions, which have been reflected in Attachment 1.
Draft Groundwater Wort Plan,IR Sites 40&70.CC 3
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beath
City Council Staff Report
February 14, 2000
RECOMMENDATION
Authorize the Mayor to sign the draft response letter, with any additional comments determined
appropriate. Receive and File Staff Report.
NOTED AND APPROVED
. /
/ / 4 /
_ _
/1,Whittenberg, Director Keith R. Till
/Development Services Department City Manager
ATTACHMENTS: (5)
Attachment 1: List of Acronyms/Abbreviations
Attachment 2: Draft Comment Letter from EQCB and City Council to Department
of Navy re: "Draft Work Plan for Long-Term Groundwater
Monitoring at Installation Restoration Sites 40 and 70, Naval
Weapons Station, Seal Beach" (As revised based on EQCB
comments on January 26, 2000)
Attachment 3: "Draft Work Plan for Long-Tenn Groundwater Monitoring at
Installation Restoration Sites 40 and 70, Naval Weapons Station,
Seal Beach", prepared by Bechtel Environmental, Inc. for
Southwest Division, Naval Facilities Engineering Command, dated
December 1999
Note: Complete document has not been provided to the City
Council due to the length of the document, 263 pages. Staff is
providing the "Summary", "Table of Contents", and Section 3 —
"Monitoring Objectives and Rationale", to the City Council for
review in considering this matter. Complete document available at
the Department of Development Services for review.
Draft Groundwater Work Plan,IR Sites 40&70.CC 4
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Maul Weapons Station, Seal Beach
City Council Staff Report
February 14, 2000
Attachment 4: Figure 2-1, Well Locations and Extent of VOC Plume in
Groundwater, IR Site 40, page 2-3
Attachment 5: Figure 2-2, Well Locations and Extent of VOC Plume in
Groundwater, IR Site 70, page 2-5
* * * *
Draft Groundwater Work Plan,1k Sites 40&70.CC 5
II
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beach
City Council Staff Report
February 14, 2000
ATTACHMENT 1
LIST OF ACRONYMS/ABBREVIATIONS
ARARs Applicable and Appropriate Requirements
bgs below ground surface
DNAPL dense nonaqueous-phase liquid
EQCB Environmental Quality Control Board
IR Installation Restoration
PCE tetrachloroethene
TCE trichloroethene
VOC volatile organic compound
NOTE: A separate listing of Acronyms/Abbreviations directly relating to the
subject report from the Navy is provided on pages viii and ix of the "Draft Work Plan for
Long-Tenn Groundwater Monitoring at Installation Restoration Sites 40 and 70, Naval
Weapons Station, Seal Beach".
Draft Groundwater Work Plan,IR Sites 40&70.CC 6
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beath
City Council Staff Report
February 14, 2000
ATTACHMENT 2
DRAFT COMMENT LETTER FROM EQCB AND
CITY COUNCIL TO DEPARTMENT OF NAVY RE:
"DRAFT WORK PLAN FOR LONG-TERM
GROUNDWATER MONITORING AT
INSTALLATION RESTORATION SITES 40 AND 70,
NAVAL WEAPONS STATION, SEAL BEACH" (As
revised based on EQCB comments on January 26,
2000)
Draft Groundwater Work Plan,1R Sites 40&70.CC 7
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1562)131-2527
February 14, 2000
Weapons Support Facility
Attn: Pei-Fen Tamashiro, :nstallation Resto,.ition Coordinator
800 Seal Beach Blvd.
Seal Beach, CA 90740-5000
SUBJECT: "Draft Work Plan for Long-Term Groundwater Monitoring at
Installation Restoration Sites 40 and 70, Naval Weapons Station,
Seal Beach"
Dear Ms. Tamashiro:
The City of Seal Beach has reviewed the report from the Department of the Navy relative to
"Draft Work Plan for Long-Tenn Groundwater Monitoring at Installation Restoration Sites 40
and 70, Naval Weapons Station, Seal Beach". It should be noted that the City has only
reviewed in detail the "Summary", and Chapter 3 of the subject document. Upon a review of
those portions of the document by the Environmental Quality Control Board and the City
Council of the City of Seal Beach, the City has the following general and specific comments.
General Comments on the Document
The Environmental Quality Control Board and the City Council understand this Work Plan
provides the framework and guidance to conduct groundwater monitoring at the subject
Installation Restoration (IR) Sites. The groundwater monitoring program will involve installing
15 new monitoring wells, monitoring groundwater surface elevations, and collecting groundwater
samples for analysis from 28 selected wells. The duration of the monitoring program is 5 years.
After 5 years, recommendations will be made to continue monitoring, reduce the sampling
frequency, or discontinue monitoring.
The general format of the document is helpful to readers in providing a brief summary of the
existing conditions at IR Sites 40 and 70, the reasons for the additional groundwater monitoring
program proposed, and the summary of data quality objectives (DQOs) for each site as set forth in
Table 3-1 and 3-2, respectively.
I I
(Ir
Tables 3-1 and 3-2, Summary of DQOs for IR Site 40 and IR Site 70, respectively, are
extremely helpful in providing a quick overview of the statement of the problem, inputs to the
decision, boundaries of the study, decision rules, and limits on dec.sion errors for each of the
subject sites. This type of presentation would be helpful in future documents as a way to provide
an easily understood summary of the particular actions proposed and the decision points as to why
this type of action is deemed achievable.
As indicated in our comment letter of Decrmber 13, 1999, the City is appreciative of the Navy
proceeding with this evaluation in an expeditious and timely manner. The length of time to
conduct this type of evaluation and reach an action determination was a concern expressed in our
letter of February 8, 1999. The timely preparation of this document, and the future decisions to
be made based on public and regulatory agency reviews and comments, are sincerely appreciated
by the City.
The City would request further clarification as to the decision points the Navy would utilize to
determine if annual or semi-annual monitoring is appropriate as proposed in Table 3-5 - Proposed
Analysis and Monitoring Frequency. In referencing Figure 3-2, the City would appreciate further
delineation as to the extent of increase in concentration or "highly variable data" that would lead
to a decision to conduct semi-annual or annual monitoring.
The Environmental Quality Control Board of the City of Seal Beach considered and reviewed the
Draft Work Plan for Long-Term Groundwater Monitoring, IR Sites 40 & 70, Naval Weapons
Seal Beach and an accompanying Staff Report on January 26, 2000, with the City Council
considering and discussing these same documents and reports on February 14, 2000. Both the
Environmental Quality Control Board and the City Council authorized the respective Chairman
and the Mayor to sign this letter indicating the official comments of the City of Seal Beach.
Thank you for your consideration of the comments of the City of Seal Beach. Please do not
hesitate to contact Mr. Lee Whittenberg, Director of Development Services, City Hall, 211
Eighth Street, Seal Beach, 90740, telephone (562) 431-2527 if you have any questions regarding
this matter. In addition, please provide a copy of the "Final Work Plan for Long-Tenn
Groundwater Monitoring at Installation Restoration Sites 40 and 70" to Mr. Whittenberg for City
information purposes when it is available.
Sincerely,
• 1-4-4
Paul Yost William G. Hurley, Vice-Chairman
an
Mayor, City of Seal Beach Environmental Quality Control Boar
J
I
Distribution: City Council City Manager
Planning Commission Director of Developme•,t Services
Environmental Quality Control Board
Archaeological Advisory Committee
f,
�r
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 710, Naval Weapons Station, Seal Beath
City Council Staff Report
February 14, 2000
February 14, 2000
Weapons Support Facility
Attn: Pei-Fen Tamashiro, Installation Restoration Coordinator
800 Seal Beach Blvd.
Seal Beach, CA 90740-5000
SUBJECT: "Draft Work Plan for Long-Term Groundwater Monitoring at
Installation Restoration Sites 40 and 70, Naval Weapons Station,
Seal Beach"
Rp►
Dear Ms. Tamashiro:
The City of Seal Beach has reviewed the report from the Department of the Navy relative to
"Draft Work Plan for Long-Term Groundwater Monitoring at Installation Restoration Sites 40
and 70, Naval Weapons Station, Seal Beach". It should be noted that the City has only
reviewed in detail the "Summary", and Chapter 3 of the subject document. Upon a review of
those portions of the document by the Environmental Quality Control Board and the City
Council of the City of Seal Beach, the City has the following general and specific comments.
General Comments on the Document
The Environmental Quality Control Board and the City Council understand this Work Plan
provides the framework and guidance to conduct groundwater monitoring at the subject
Installation Restoration (IR) Sites. The groundwater monitoring program will involve installing
15 new monitoring wells, monitoring groundwater surface elevations, and collecting groundwater
samples for analysis from 28 selected wells. The duration of the monitoring program is 5 years.
After 5 years, recommendations will be made to continue monitoring, reduce the sampling
frequency, or discontinue monitoring.
Draft Groundwater Work Plan, IR Sites 40&70.CC 8
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beach
City Council Staff Report
February 14, 2000
The general format of the document is helpful to readers in providing a brief summary of the
existing conditions at IR Sites 40 and 70, the reasons for the additional groundwater monitoring
program proposed, and the summary of data quality objectives (DQOs) for each site as set forth in
Table 3-1 and 3-2, respectively.
Tables 3-1 and 3-2, Sumunary of DQOs for IR Site 40 and IR Site 70, respectively, are
extremely helpful in providing a quick overview of the statement of the problem, inputs to the
decision, boundaries of the study, decision rules, and limits on decision errors for each of the
subject sites. This type of presentation would be helpful in future documents as a way to provide
an easily understood summary of the particular actions proposed and the decision points as to why
this type of action is deemed achievable.
As indicated in our comment letter of December 13, 1999, the City is appreciative of the Navy
proceeding with this evaluation in an expeditious and timely manner. The length of time to
conduct this type of evaluation and reach an action determination was a concern expressed in our
letter of February 8, 1999. The timely preparation of this document, and the future decisions to
be made based on public and regulatory agency reviews comments, are sincerely appreciated
by the City.
DR PF
The City would request further clarification as to the decision points the Navy would utilize to
determine if annual or semi-annual monitoring is appropriate as proposed in Table 3-5 - Proposed
Analysis and Monitoring Frequency. In referencing Figure 3-2, the City would appreciate further
delineation as to the extent of increase in concentration or "highly variable data" that would lead
to a decision to conduct semi-annual or annual monitoring.
The Environmental Quality Control Board of the City of Seal Beach considered and reviewed the
Draft Work Plan for Long-Term Groundwater Monitoring and an accompanying Staff Report on
January 26, 2000, with the City Council considering and discussing these same documents and
reports on February 14, 2000. Both the Environmental Quality Control Board and the City
Council authorized the respective Chairman and the Mayor to sign this letter indicating the official
comments of the City of Seal Beach.
Thank you for your consideration of the comments of the City of Seal Beach. Please do not
hesitate to contact Mr. Lee Whittenberg, Director of Development Services, City Hall, 211
Eighth Street, Seal Beach, 90740, telephone (562) 431-2527 if you have any questions regarding
this matter. In addition, please provide a copy of the "Final Work Plan for Long-Tenn
Groundwater Monitoring at Installation Restoration Sites 40 and 70" to Mr. Whittenberg for City
information purposes when it is available.
Draft Groundwater Work Plan,IR Sites 40 at 70.CC 9
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beath
City Council Staff Report
February 14, 2000
Sincerely,
Paul Yost William G. Hurley, Vice-Chairman
Mayor, City of Seal Beach Environmental Quality Control Board
P.‘
DR
Distribution: City Council City Manager
Planning Commission Director of Development Services
Environmental Quality Control Board
Archaeological Advisory Committee
Draft Groundwater Work Plan,IR Sites 40&70.CC 10
City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 710, Naval Weapons Station, Seal Beath
City Council St'Report
February 14, 2000
ATTACHMENT 3
"DRAFT WORK PLAN FOR LONG-TERM
GROUNDWATER MONITORING AT
INSTALLATION RES710RATION SITES 40 AND 70,
NAVAL WEAPONS STATION, SEAL BEACH",
PREPARED BY BECHTEL ENVIRONMENTAL,
INC. FOR SOUTHWEST DIVISION, NAVAL
FACILITIES ENGINEERING COMMAND, DATED
DECEMBER 1999
NOTE: COMPLETE DOCUMENT HAS NOT
BEEN PROVIDED TO THE BOARD DUE TO THE
LENGTH OF THE DOCUMENT, 263 PAGES.
STAFF IS PROVIDING THE "SUMMARY",
"TABLE OF CONTENTS", AND SECTION 3 -
"MONITORING OBJECTIVES AND
RATIONALE", TO THE CITY COUNCIL FOR
REVIEW IN CONSIDERING THIS MATTER
COMPLETE DOCUMENT AVAILABLE AT THE
DEPARTMENT OF DEVELOPMENT SERVICES
FOR REVIEW.
Draft Groundwater Work Plan,IR Sites 40&70.CC 1 1
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Date: 12/21/99
SUMMARY
This Work Plan provides the framework and guidance to conduct groundwater monitoring in the
vicinity of the following Installation Restoration Program sites (IR sites) at Naval Weapons
Station, Seal Beach, Seal Beach, California:
• IR Site 40, Concrete Pit/Gravel Area; and
• IR Site 70, Research,Testing, and Evaluation Area.
The groundwater monitoring program will involve installing 15 new monitoring wells,
monitoring groundwater surface elevations, and collecting groundwater samples for analysis
from 28 selected wells. The duration of the monitoring program is 5 years.
Groundwater surface elevations will be monitored monthly for the first year, and prior to each
sampling event thereafter. The data will be used to evaluate seasonal variations in the
groundwater potentiometric surface.
Previous investigations have identified the presence of chlorinated solvents in groundwater at IR
Sites 40 and 70. The extent of contamination has been delineated, and a feasibility study is
currently being conducted under a separate scope of work to evaluate remedial alternatives. The
monitoring program is designed to measure chemical concentrations within and around the
chlorinated solvent plumes over time. The data will be used to establish contaminant
concentration trends, assess the effectiveness of remedial actions, when implemented, monitor
for natural attenuation of the chemicals of concern, and assess whether downgradient receptors
have the potential to become affected by the contaminant plumes. In addition, metals were
reported in groundwater at IR Site 70. The extent of mercury concentrations above statistical
background and hexavalent chromium concentrations above the detection limit was not fully
delineated during previous investigations. Further delineation of these metals will be performed
as part of the groundwater monitoring program.
Table S-1 summarizes the wells proposed for sampling. All the proposed wells will be
monitored quarterly for volatile organic compounds and semiannually for natural attenuation
indicators during the first year. Metals, including hexavalent chromium, will be monitored
semiannually for the first year in six wells to the south and southeast of IR Site 70. Data
collected during the first year will be used to establish the monitoring frequency for subsequent
years. Monitoring for volatile organic compounds and natural attenuation indicators will be
reduced to semiannual or annual, depending on the location of the well in relation to the plume,
the direction of concentration trends, and the variability of the results. Monitoring for metals
will be discontinued after the first year.
Data will be reported following each sampling event. Data evaluation will be conducted after the
first, third, and fifth years of monitoring. Evaluation will include observing variability in results,
comparing chemical concentrations to screening levels established for groundwater, and
observing trends in chemical concentrations over time. Recommendations for further action will
be made if the data indicate that the plumes are reaching potential receptors. After 5 years,
recommendations will be made to continue monitoring, reduce the sampling frequency, or
discontinue monitoring.
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach page i
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Summary
Table S-1
Summary of Groundwater Sampling Locations
Initial Monitoring Frequency(First Year)
Volatile Natural
IR
Organic Attenuation
Site Well No. Status g Hezavalent
Location Compounds Indicators* Metals Chromium
40 40-MW-03 Existing In plume, Q S NA NA
crossgradient,
perimeter
40-MW-05 Existing In plume,center Q S NA NA
MW-40-08 Existing In plume, Q S NA NA
downgradient,
perimeter
MW-40-12 Existing In plume, Q S NA NA
downgradient,
perimeter
MW-40-14 Existing In plume,center Q S NA NA
MW-40-15 Existing Downgradient Q S NA NA
MW-40-16 Existing Downgradient Q S NA NA
MW-40-17 Proposed Downgradient Q S NA
NA
MW-40-18 Proposed Downgradient Q S NA NA
MW-40-19 Proposed Crossgradient Q S NA NA
(SW lateral)
MW-40-20 Proposed Crossgradient Q S NA NA
(SW lateral)
MW-40-21 Proposed Background Q S NA
(Upgradient) N 4
70 EW-70-01 Existing In plume, Q S NA
NA
upgradient
MW-70-04 Existing In plume, center Q S NA NA
MW-70-08 Existing In plume,center Q S NA NA
MW-70-09 Existing In plume, center Q S NA
NA
MW-70-10 Proposed Crossgradient Q S 2Q NA
(NE lateral)
MVV-70-11 Proposed Crossgradient Q S NA NA
(NE lateral)
MW-70-15 Existing In plume, Q S NA NA
downgradient
MW-70-16 Existing In plume, Q S NA NA
downgradient
(table continues)
f
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Summary
Table S-1 (continued)
Initial Monitoring Frequency(First Year)
Volatile Natural
IR Organic Attenuation Hexavalent
Site Well No. Status Location Compounds Indicators' Metals Chromium
MW-70-17 Proposed Crossgradient Q S 2Q 2Q
(SW lateral)
MW-70-18 Proposed Crossgradient Q S NA NA
(SW lateral)
MW-70-19 Proposed Background Q S NA NA
(Upgradient)
MW-70-20 Proposed In plume, Q S NA NA
downgradient
MIX-70-21 Proposed Background Q S NA NA
(Downgradient)
MW-70-22 Proposed In plume, Q S NA NA
downgradient
MW-70-23 Proposed Crossgradient Q S NA NA
(NE lateral)
MW-70-24 Proposed Crossgradient Q S 2Q 2Q
(SW lateral)
Note:
Natural attenuation indicators: alkalinity, ammonia,anions, cations,total iron,ferrous iron,total
dissolved solids,total organic carbon,dissolved gases, dissolved oxygen, and redox potential
Acronyms/Abbreviations:
2Q—monitor for two quarters
A—annual monitoring
EW—extraction well
IR—installation restoration
MW—monitoring well
NA—not applicable
NE—northeast
Q—quarterly monitoring
S—semiannual monitoring
SW—southwest
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach page iii
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Summary
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TABLE OF CONTENTS
Section
Page
SUMMARY
ACRONYMS/ABBREVIATIONS viii
1 INTRODUCTION
1.1 Purpose 1-1
1.2 Scope 1-1
1.3 Organization 1-2
2 BACKGROUND
2.1 History 2-1
2.1.1 IR Site 40 and Surrounding Area 2-1
2.1.2 IR Site 70 and Surrounding Area 2-1
2.2 Previous Environmental Investigations 2-2
2.3 Physical Setting 2-7
2.3.1 Regional and Site Geology 2-7
2.3.2 Regional Hydrogeology 2-8
2.3.3 IR Site 40 Geology and Hydrogeology 2-8
2.3.4 IR Site 70 Geology and Hydrogeology 2-11
2.3.5 Groundwater Quality and Use 2-15
2.4 Nature and Extent of Contamination 2-16
2.4.1 IR Site 40 2-16
2.4.2 IR Site 70 2-16
3 MONITORING OBJECTIVES AND RATIONALE
3.1 Data Quality Objectives 3-1
3.2 Proposed Well Installation 3-1
3.3 Monitoring Frequency and Analytical Parameters 3-1
4 SUMMARY OF FIELD ACTIVITIES
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70,WPNSTA, Seal Beach page v
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TABLE OF CONTENTS (continued)
Section
5 DATA INTERPRETATION METHODS
6 SCHEDULE
7 REFERENCES
APPENDICES
Appendix
I WATER-LEVEL DATA
II ISOCONCENTRATION MAPS
ATTACHMENTS
Attachment
A FIELD SAMPLING PLAN
B QUALITY ASSURANCE PROJECT PLAN
C DATA MANAGEMENT PLAN
D INVESTIGATION-DERIVED WASTE MANAGEMENT PLAN
E AMENDMENT TO THE CTO-0127 SITE-SPECIFIC SAFETY AND HEALTH
PLAN SUPPLEMENT
page vi Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach
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TABLE OF CONTENTS (continued)
FIGURES
Figure Pace
1-1 Site Location Map 1-3
1-2 IR Site 40 Base Map 1-5
1-3 IR Site 70 Base Map 1-7
2-1 Well Locations and Extent of VOC Plume in Groundwater, IR Site 40 2-3
2-2 Well Locations and Extent of VOC Plume in Groundwater, IR Site 70 2-5
2-3 IR Site 40— Site Physical Conceptual Model 2-9
2-4 IR Site 70—Site Physical Conceptual Model 2-13
2-5 Wells Within a 1.5-Mile Radius of Naval Weapons Station 2-17
3-1 Data Quality Objectives Decision Flow Diagram 3-7
3-2 Monitoring Frequency Decision Flow Diagram,Naval Weapons Station,
Seal Beach 3-17
6-1 Monitoring and Reporting Schedule for Year 1 6-2
TABLES
Table
S-1 Summary of Groundwater Sampling Locations ii
3-1 Summary of DQOs for IR Site 40 3-3
3-2 Summary of DQOs for IR Site 70 3-5
3-3 Well Construction Summary 3-8
3-4 Summary of Historical Results and Sampling Rationale 3-11
3-5 Proposed Analyses and Monitoring Frequency 3-18
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach
12/15/99 9.47 Ml rim I:1tlssn3MwwO_prooawnpkso0002 9.914919 99 9Y00,ea,.Ooe page vii
CLEAN 3
CTO-0002/0020
Date: 12/21/99
ACRONYMS/ABBREVIATIONS
bgs below ground surface
BNI Bechtel National, Inc.
CBCEC California Base Closure Environmental Committee
CERCLA Comprehensive Environmental Response, Compensation, and Liability
Act
CLEAN Comprehensive Long-Term Environmental Action Navy
COC chemical of concern
COPC chemical of potential concern
Cr(VI) hexavalent chromium
CTO Contract Task Order
DON Department of the Navy
DQO data quality objective
ERSE extended RSE
°F degrees Fahrenheit
FS feasibility study
FSEC Facilities Systems Engineering Company
FSI focused site inspection
FSP Field Sampling Plan
IAS initial assessment study
IDV' investigation-derived waste
IR Installation Restoration
JEG Jacobs Engineering Group, Inc.
LCA LeRoy Crandall and Associates
Aga- micrograms per liter
mg/L milligrams per liter
MPN most probable number
NASA National Aeronautics and Space Administration
OU Operable Unit
PA preliminary assessment
PCE tetrachioroethene
QAPP Quality Assurance Project Plan
page viii Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Se& Beach
12/13/1999 9:04 AM pxp 19 n?w,ati_yrvcassanQcto00C2444orkyantlref119900183s aoc
CLEAN 3
CTO-0002/0020
Date 12/21/99
ACRONYMS/ABBREVIATIONS (continued)
RCRA Resource Conservation and Recovery Act
RFA RCRA facility assessment
RRSEM Relative Risk Site Evaluation Model
RSE removal site evaluation
RT&E Research, Testing, and Evaluation
SI site inspection
SWDIV Southwest Division Naval Facilities Engineering Command
TCE trichloroethene
TDS total dissolved solids
U.S. EPA United States Environmental Protection Agency
UST underground storage tank
VOC volatile organic compound
WPNSTA (Naval) Weapons Station
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach page ix
12113/1999 904 AM 9xq I:C4sn3wo d y0c444fi^O%nc0002*wNcyantrs4r19900183a Doc
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Date: 12/21/99
ACRONYMS/ABBREVIATIONS (continued)
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CLEAN 3
CTO-0002/0020
Date. 12/21/99
Section 3
MONITORING OBJECTIVES AND RATIONALE
As discussed in Section 2.4, the primary COCs at IR Sites 40 and 70 are chlorinated solvents.
Mercury and hexavalent chromium are COPCs at IR Site 70 because they have not been fully
delineated. The objectives of the monitoring program are to monitor the concentrations of VOCs
in groundwater, establish contaminant concentration trends, assess the effectiveness of remedial
actions, monitor for natural biodegradation of the COCs, further delineate mercury and
hexavalent chromium at IR Site 70, and assess whether downgradient receptors have the
potential to become affected by the contaminant plume. The attached FSP presents the detailed
DQO process as well as the details for installing new wells and collecting the required
groundwater samples. The attached QAPP presents the analytical procedures and quality
assurance measures to be implemented.
All the proposed remedial options (BNI 1999b) include monitored natural attenuation as part of
the remedial process. Monitored natural attenuation relies on naturally occurring in situ
processes (e.g., biodegradation, chemical transformation, volatilization, dilution, dispersion, and
adsorption) to achieve removal action objectives within a reasonable time frame
(U.S. EPA 1997). Under certain conditions, these natural processes act to reduce the mass,
toxicity, mobility, or volume of VOC-contaminated groundwater. Monitoring is necessary to
measure cleanup progress. Therefore, collection and analysis of samples for various inorganic
analyses will also be conducted to monitor the natural attenuation effects.
3.1 DATA QUALITY OBJECTIVES
The technical approach for the groundwater monitoring program is based on the seven-
step DQO development process (U.S. EPA 1994), described in detail in the FSP. The
DQO process provides a mechanism to develop the technical assumptions used to design
the investigation. The seven steps of the DQO process are briefly summarized in
Tables 3-1 and 3-2 for IR Sites 40 and 70, respectively. Figure 3-1 shows the DQO
decision flow process.
3.2 PROPOSED WELL INSTALLATION
The installation of new wells is proposed for both IR Sites 40 and 70 to fill data gaps and
protect downgradient receptors. These wells will be located outside the contaminant
plume and will assure that each plume has upgradient, crossgradient, and downgradient
wells to monitor for plume migration. Figures 2-1 and 2-2 show the proposed locations
of the new wells for IR Sites 40 and 70, respectively. Table 3-3 summarizes the proposed
well construction details and well placement rationale.
3.3 MONITORING FREQUENCY AND ANALYTICAL PARAMETERS
The monitoring frequency is based on recommendations in the Long-Term Ground Water
Monitoring Program Guidance (CBCEC 1994). The objective of the monitoring
program is to monitor the contaminant plumes to evaluate the remedial effort once
implemented, and to monitor for downgradient or lateral migration of the plume.
Therefore, only wells in the center (near the suspected source area) or the perimeter of the
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach page 3-1
12/1411999 940 AM>•Itiesra.porp r g ct pp ,ygdv ttre\99OQ i 13d cloc
CLEAN 3
CTO-0002/0020
Date: 12/21/99
Section 3 Monitoring Objectives and Rationale
plume are recommended for monitoring. Other wells will be used for monitoring
groundwater elevations, or may be used later as part of the monitoring for the chosen
remedy. Table 3-4 presents the rationale for monitoring or not monitoring each well.
Figures 2-1 and 2-2 show the locations of the wells for IR Sites 40 and 70, respectively.
Wells will initially be sampled quarterly for four consecutive quarters to establish
baseline COC trends (Figure 3-2). At the conclusion of the fourth quarter of sampling,
the data will be evaluated in order to modify the monitoring frequency to semiannually or
annually (with Navy and regulatory agency concurrence)depending on the location of the
well, contaminant concentration trends, and concentration variability. Wells with
increasing contaminant trends or highly variable data will be sampled semiannually.
Other wells will be sampled annually. The methodology for determining concentration
trends and concentration variability is discussed in Section 5.
Monitoring is scheduled to be conducted over a period of 5 years; however, monitoring
of individual wells may be terminated, with the concurrence of the regulatory agencies, if
the data indicate that monitoring is no longer required. In addition to frequency
evaluation at the end of the first year, the well sampling frequency will also be evaluated
at the end of the third and fifth years of sampling.
Table 3-5 lists the analytical parameters proposed for IR Sites 40 and 70. Chlorinated
solvents have been identified as COCs at each site. In addition, mercury and hexavalent
chromium have been identified as COPCs at IR Site 70 because the lateral extent has not
been fully delineated to the east and south of the site. Therefore, two rounds of metals
and hexavalent chromium analyses are proposed in wells to the south and east of
IR Site 70.
Natural attenuation indicators will also be monitored in addition to VOCs (and metals at
IR Site 70). Table 3-5 lists the analytes and initial monitoring frequency. Natural
attenuation indicators are proposed for semiannual or annual monitoring, depending on
the frequency with which the well is to be sampled.
page 3-2 Draft Long-Term GW Monitoring Work Plan—IR Sites 40 and 70, WPNSTA, Seal Beach
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CLEAN 3
CTO-000210020
Date: 12/21/99
Section 3 Monitoring Objectives and Rationale
Metals Have metals Yes
Perform 4 quarters of been Recommend no further
sampling and analysis for adequately action for metals
VOCs;and perform delineated?
2 quarters of sampling and
analysis for metals
No
V
VOCs Recommend further
delineation of metals
ill Continue monitoring
No
V
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frequency for COCs Is the plume No Has 5 years of
following decision flow reaching monitoring
in Figure 3-2 potential A been
receptors? completed?
Yes
Yes
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additional remedial actions
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concentrations
indicate stable or
decreasing
Yes trends?
No
T
( Recommend reducing the Recommend continued
monitoring frequency or monitoring
discontinue monitoring
Figure 3-1
Data Quality Objectives Decision Flow Diagram
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70, WPNSTA, Seal Beach page 3-7
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page 3-9
CLEAN 3
CTO-0002/0020
Date. 12/21/99
Section 3 Monitoring Objectives and Rationale
This page left blank intentionally
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Naval Weapons Station, Seal Beach
Draft Long-Term GW Monitoring Work Plan— IR Sites 40 and 70,WPNSTA, Seal Beach page 3-17
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City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beach
City Council Staff Report
February 14, 2000
ATTACHMENT 4
FIGURE 2-1, WELL LOCATIONS AND EXTENT
OF VOC PLUME IN GROUNDWATER, IR SITE
40, PAGE 2-3
Draft Groundwater Work Plan,IR Sites 40&70.CC 12
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City Response Letter re:Draft Work Plan for Long-Term Groundwater Monitoring,
IR Sites 40 and 70, Naval Weapons Station, Seal Beath
City Council Staff Report
February 14, 2000
ATTACHMENT 5
FIGURE 2-2, WELL LOCATIONS AND EXTENT
OF VOC PLUME IN GROUNDWATER, IR SITE
70, PAGE 2-5
Draft Groundwater Work Plan,Rt Sites 40&70.CC 13
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