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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Apache Powder Company

Superfund Site

Remedial AR (Part 2)

Administrative Record Index

To request copies of administrative record documents, an electronic order form is available.

This administrative record file contains the documents that the U.S. Environmental Protection Agency (EPA) used to identify appropriate remedial activities for use at the Apache Powder Co. Superfund site, St. David, Arizona. It is presented in Compact Disk (CD) format. The administrative record file will be updated periodically. The current update to the Apache Powder Co. administrative record will be complete after public comments on EPA's Proposed Plan, EPA's response to comments, and the amended Record of Decision are included in a future update.
The administrative record supports the Record of Decision (ROD), dated September 30, 1994 (Doc # 88001234); the proposed Explanation of Significant Differences (ESD) #1, dated April 16, 1997 (Doc #88001314); ESD #2, dated September 29, 2000 (Doc #90560); and the Proposed Plan, dated July 2005 (Doc #2066325).

The four lists of U.S. Environmental Protection Agency guidance documents which were considered or relied upon in the selection of the remedy are documents #88000981, #88002997, #88003313, and #2066324 in this administrative record file. Copies of the guidance documents are contained in the Compendium of CERCLA Response Selection Guidance Documents located in the Region 9 Superfund Records Center.

EPA welcomes questions and comments on documents contained in the administrative record file. Please contact:

Andria Benner
Remedial Project Manager
U.S. EPA (SFD-8-2)
75 Hawthorne Street
San Francisco, CA 94105-3901
(415) 972-3189

or

Vicki Rosen
Community Involvement Coordinator
U.S. EPA (SFD-3)
75 Hawthorne Street
San Francisco, CA 94105-3901
(415) 972-3244 or 1-800-231-3075

List of Abbreviations and Acronyms Used in Administrative Record Index

ABBREVIATIONMEANING
ADEQArizona Dept of Environmental Quality
ADHS-EHSArizona Dept of Health Services - Environmental Health Services
ADWSAlternative Drinking Water Supply
ADWSPAlternative Drinking (Domestic) Water Supply Plan
ANPApache Nitrogen Products, Inc
AOAdministrative Order
AOAAdministrative Order Amendment
appAppendix
ARAdministrative Record
ARARApplicable or Relevant & Appropriate Requirement
AssocAssociates
ATSDRAgency for Toxic Substances and Disease Registry
attchAttachment
AZState of Arizona
AZDEQArizona Dept of Environmental Quality
CAState of California
CERCLAComprehensive Environmental Response, Compensation, and Liability Act of 1980 (Superfund)
CLPContract Laboratory Program (National)
CoCompany
CorpCorporation
DeptDept
DNTDinitrotoluene
edEdition
EMSLEnvironmental Monitoring Support (or Systems) Laboratory
envEnvelope
EPAEnvironmental Protection Agency
ESDExplanation of Significant Differences
FOIAFreedom of Information Act
frFrom
FSFeasibility Study
FSPField Sampling Program
gwGroundwater
HIRHydrogeologic Investigation Report
HRSHazard Ranking System
HWDSHazardous Waste Data System
HwyHighway
IDIdentification
ltrLetter
MCLMaximum Contaminant Level
MemoMemorandum
MG/LMilligrams per liter
mtgMeeting
NPLNational Priorities List
NTISNational Technical Information Service
OIGOffice of the Inspector General
RARemedial Action
RD/RARemedial Design/Remedial Action
revRevision
rptReport
SOWStatement of Work or Scope of Work
StSaint
TCLPToxicity Characteristic Leaching Procedure
TDSTotal Dissolved Solids
TLTransmittal Letter
TNTTrinitrotoluene
TRCTechnical Review Committee
UAOUnilateral Administrative Order
UnivUniversity
USUnited States
USGSUnited States Geological Survey
VOCVolatile Organic Compound
w/With
w/oWithout
WPCFWater Pollution Control Federation

Administrative Record Index

Doc. DateAuthor / Author Org.Addressee / Addressee Org.Title / SubjectDoc. ID
03/01/1996Hargis & Assoc, IncApache Nitrogen Products, IncRD workplan for shallow aquifer gw, media components 2 & 6 w/TL to A Benner fr K Alter 2/29/96 (AO 95-07)88001285
04/17/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Biological assessment & archeological survey to support RD for shallow aquifer treatment system88002991
04/17/1996Andria Benner / Environmental Protection Agency - Region 9Sam Spiller / US Dept of the Interior - Fish & Wildlife ServiceLtr: Requests copy of "safe harbors" policy & update of federally listed endangered species in vicinity of site w/encls88002990
04/29/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Wetlands construction issues & transmits comments on revision 2 of RD workplan for shallow aquifer gw, media components 2 & 6, w/encl88001302
05/17/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Extension of deadline for responding to EPA comments on revision 2 of shallow aquifer workplan w/comments88002987
05/23/1996Sherry Ruther / AZ Game & Fish DeptAndria Benner / Environmental Protection Agency - Region 9Ltr: Follow-up comments to mtg re development of artificial wetland w/attch88002986
06/12/1996Hargis & Assoc, IncApache Nitrogen Products, IncSummary of quarterly gw & surface water monitoring program, 11/95 & 1995 annual rpt, w/TL to A Benner fr K Alter88001289
06/27/1996Hargis & Assoc, IncApache Nitrogen Products, IncRD workplan for shallow aquifer gw, media components 2 & 6 w/TL to A Benner fr K Alter 6/27/96 (AO-95-07)88001291
07/12/1996Kerstin Alter / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Requests approval to proceed with 3 tasks re RD workplan for shallow aquifer gw88002985
07/16/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Approval to proceed with additional geotechnical work to support RD for shallow aquifer gw88002984
07/23/1996Kerstin Alter / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Transmits site plan of approximate locations of test pits w/encl88002983
08/02/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Powder CoLtr: Wetlands issues & transmits comments on revision 3 of RD workplan for shallow aquifer gw, media components 2 & 6, w/encl88001303
08/19/1996Hargis & Assoc, IncApache Nitrogen Products, IncSummary of quarterly gw & surface water monitoring program (11/95 [also contains 95 annual rpt], 2/96 & 5/96) w/TLs88001295
08/23/1996Marc Coggeshall / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Transmits biological & archaeological assessment rpts w/encls88001304
08/26/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Summary of follow-up comments on shallow aquifer RD workplan, revision 3, as discussed at 8/7-8/96 mtg88002979
08/30/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Summary of follow-up comments on shallow aquifer RD workplan, revision 3, as discussed at 8/14/96 mtg88002978
09/01/1996Environmental Protection Agency - Region 9-Fact sheet: Status of activities at Apache Powder Superfund site88002977
09/02/1996Erik Nelson / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Notification of additional drilling operations 9/11-13/96 w/proposed boring locations88002976
09/02/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Transmits comments on revision 2 of perched gw RD workplan, media component 1, 3/1/96 w/encl88002975
09/03/1996Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Schedule for technical mtgs & community mtg88002974
09/04/1996Andria Benner / Environmental Protection Agency - Region 9Leo Leonhart / Hargis & Assoc, IncLtr: Authorizes Hargis to conduct test borings 9/11-13/96 w/encls88002972
09/30/1996Hargis & Assoc, IncApache Nitrogen Products, IncRD workplan for shallow aquifer groundwater media components 2 & 6, rev 4.0, w/TL to A Benner fr K Alter (oversize maps only)2064274
09/30/1996Hargis & Assoc, IncApache Nitrogen Products, IncRD workplan for shallow aquifer groundwater media components 2 & 6, rev 4.0, w/TL to A Benner fr K Alter, w/o oversize maps88001300
10/11/1996Hargis & Assoc, IncApache Nitrogen Products, IncRD workplan for perched gw, media component 1 revision 3, w/TLs (AO 95-07)88001279
11/01/1996Environmental Protection Agency - Region 9-Fact sheet: Remedial design activities update88001315
11/08/1996Environmental Protection Agency-Guidance document included in Compendium of CERCLA Response Selection Guidance Documents88002997
04/16/1997Environmental Protection Agency - Region 9-Explanation of significant differences (ESD) for final remedy record of decision (ROD), w/TL to K Takata fr J Kemmerer 4/16/9788001314
12/31/1997AZ Dept of Environmental Quality-Article 2, soil remediation standards (AZ Admin Code, Title 18, Ch 7), w/appendix A, w/o appendix B-D88001479
07/13/1998Hargis & Assoc, Inc-Rev 2.0, RD workplan for soils, media components 3, 4, 5, 7 & 8 - v1 of 2, w/TL to A Benner fr K Alter 7/10/9888001473
07/13/1998Hargis & Assoc, Inc-Rev 2.0, RD workplan for soils, media components 3, 4, 5, 7 & 8 - v2 of 2, comprehensive soil sampling & monitoring plan (oversize map only)2056768
07/13/1998Hargis & Assoc, Inc-Rev 2.0, RD workplan for soils, media components 3, 4, 5, 7 & 8 - v2 of 2, comprehensive soil sampling & monitoring plan (oversize photo only)2056769
07/13/1998Hargis & Assoc, Inc-Rev 2.0, RD workplan for soils, media components 3, 4, 5, 7 & 8 - v2 of 2, comprehensive soil sampling & monitoring plan, w/o oversize map or photo88001474
10/16/1998Hargis & Assoc, Inc-Supplemental FS rpt, Rev 1.0, w/TL to A Benner fr K Alter88001480
01/07/1999Brian Waggle / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Results of confirmatory sampling, paraffin contaminated soil, w/encls88001475
05/10/1999Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Sampling proposal, impacted soil in Wash 5 area, w/encls88001476
12/29/1999Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: EPA approval for Apache to dispose of ceramic packing material, w/attchs (preliminary laboratory results, 12/23/99 & 12/29/99)88001485
01/07/2000Robert Gearheart / CA State Univ, Humboldt
Wendy Snible / CA State Univ, Humboldt
Michael Ives / CA State Univ, Humboldt
Apache Nitrogen Products, IncDraft simultaneous perchlorate & nitrate reduction in wetland treatment system, w/app A2065034
01/10/2000Erik Nelson / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Proposed confirmation sampling methodologies, media components 4, 5 & 7, w/encls88001477
01/12/2000Erik Nelson / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Disposal plans for naphthalene contaminated soil - transmits laboratory data, w/attch88003399
01/24/2000Michael Zorba / C H 2 M HillAndria Benner / Environmental Protection Agency - Region 9Technical Memo: Apache Nitrogen Products remedial pre-burn oversight2065033
02/28/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Transmits proposed scope of work for next phase of Humboldt State Univ perchlorate treatability study, w/encl88003788
03/03/2000J Powell / US Dept of the Treasury - Bureau of Alcohol, Tobacco & Firearms
Reg Pattee / City of Glendale, AZ - Police Dept
Walt Taggart / International Assn of Bomb Technicians & Investigators, The - Arizona Chapter
Apache Nitrogen Products, IncMemo: Explosive disposal technicians cleared buildings in old Apache Powder line for explosive or inert materials88003710
03/10/2000Andria Benner / Environmental Protection Agency - Region 9Leo Leonhart / Hargis & Assoc, IncLtr: Comments on technical workplan for new shallow aquifer monitoring well construction & perched zone soil borehole investigation, w/encl & TL88003795
03/27/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Revised technical workplan for new shallow aquifer monitor well construction, w/attchs88001774
04/05/2000Hargis & Assoc, IncApache Nitrogen Products, Inc11/99 quarterly summary & 1999 annual summary of groundwater & surface water monitoring program, w/apps & TL to A Benner fr K Alter88001688
04/11/2000Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Approves revised technical workplan for new shallow aquifer monitor well construction88003755
04/21/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Revised technical workplan for new perched zone monitor well construction, w/attchs88001775
05/01/2000AZ Dept of Health Services - Office of Environmental Health-Health based guidance level for perchlorate (Cl04)-2013703
05/18/2000Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Approves revised technical workplan for new perched zone monitor well construction (Hargis + Assoc, 4/21/00)88003807
05/25/2000Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 7/99-12/99, w/apps & TL to A Benner fr K Alter88001689
06/27/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Written notification of plans to remove & dispose of "unknown drum", w/encls88001478
06/28/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Proposal for enhanced start-up of northern area remediation system88003820
07/18/2000Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Approves enhanced start-up of northern area remediation system88003828
07/25/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Modifications to proposed enhanced start-up of northern area remediation system, w/map & TL88003829
07/27/2000William Ellett / AZ Dept of Environmental QualityAndria Benner / Environmental Protection Agency - Region 9Email: Perchlorate eco-toxicity88003833
08/02/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Written notification of discovery of buried asbestos containing material at site - proposed followup actions, w/attchs88003400
08/04/2000Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Additional information re carbon enhancement study for in situ bioremediation, w/TL88003836
09/21/2000Environmental Protection Agency - Region 9-Guidance documents consulted during preparation of 2nd explanation of significant differences (ESD)88003313
09/29/2000Keith Takata / Environmental Protection Agency - Region 9-Explanation of significant difference (ESD) #2 to modify soils cleanup remedy, w/attchs (01 ESD #2 002)90560
10/02/2000Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities northern area remediation system treatment wetland (1/00-6/00), w/apps & TL to A Benner fr K Alter88001695
11/22/2000Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Requests ecological risk screen for areas with residual levels of soil & sediment contamination, w/attchs & TL88001787
12/22/2000Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Comments on RA implementation rpt for media component 3 (inactive ponds) (Hargis + Assoc, 9/26/00), w/attchs & TL88001789
01/03/2001Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Proposed perchlorate sorption studies workplan, w/o encl2065138
01/05/2001Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Discusses & transmits 1/19/01 mtg agenda, technical discussions re soils closeout & groundwater modeling, w/encl2065139
01/12/2001Andria Benner / Environmental Protection Agency - Region 9Kerstin Alter / Apache Nitrogen Products, IncLtr: Requests further soil characterization re active ponds, source control requirements of monitored natural attenuation (MNA) guidance, w/o encl2065140
02/14/2001Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Technical workplan for MNA (monitored natural attenuation) compliance source control perched zone soil borings, w/attchs A & B2065141
02/26/2001Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Proposed agenda, 3/8/01 interagency technical mtg re shallow aquifer groundwater contamination, w/attch2065142
03/02/2001Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Approves MNA (monitored natural attenuation) compliance source control perched zone soil borings technical workplan2065143
03/21/2001Hargis & Assoc, IncApache Nitrogen Products, IncRA implementation rpt for media component 3 (inactive ponds), revision 2.0, w/apps, TLs 2/27/01 & 3/21/01 to A Benner fr L Leonhart, & encl (response summary)88001620
04/17/2001Hargis & Assoc, IncApache Nitrogen Products, IncSummary of quarterly groundwater & surface water monitoring program, 11/00, & 2000 annual summary, w/apps & TL to A Benner fr P Beilke88001697
04/27/2001Hargis & Assoc, IncApache Nitrogen Products, IncCharacterization of groundwater systems in southern area (draft), w/apps & TL to A Benner fr P Beilke 4/26/01, w/o oversize drawing or map88001631
04/27/2001Hargis & Assoc, IncApache Nitrogen Products, IncCharacterization of groundwater systems in southern area (draft), w/apps, TL to A Benner fr P Beilke 4/26/01 (oversize drawing only)2056759
04/27/2001Hargis & Assoc, IncApache Nitrogen Products, IncCharacterization of groundwater systems in southern area (draft), w/apps, TL to A Benner fr P Beilke 4/26/01 (oversize map only)2056758
05/10/2001Hargis & Assoc, IncApache Nitrogen Products, IncRD/RA rpt, 1/00-12/00, w/app & TL to A Benner fr P Beilke88001698
05/18/2001Thom Deane / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Memo: Discusses & transmits preliminary tables & graphics re 5/21/01 mtg, MNA (monitored natural attenuation) rpt findings & proposed perched zone hydraulic control measures, w/attchs2065146
06/14/2001Erik Nelson / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Requests permission to begin enhanced establishment period pilot test, Northern area treatment wetland, w/encl2065147
06/15/2001Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Approval of enhanced establishment period pilot test, Northern area treatment wetland, w/o attch2065148
06/29/2001Hargis & Assoc, IncApache Nitrogen Products, IncApplicability of monitored natural attenuation (draft rpt), w/apps & TL to A Benner fr P Beilke88001563
06/29/2001Hargis & Assoc, IncApache Nitrogen Products, IncSupplemental FS rpt, media components 1 & 2B, w/TL to A Benner fr E Nelson88001564
07/13/2001Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 7/00-12/00, w/apps88001565
08/30/2001Black & Veatch-Excerpt: Surface water data fr Preliminary investigation rpt (6/88, sampling done 10/87), w/TL to A Benner fr B Ellett2065150
09/28/2001Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 1/01-6/01, w/apps & TL to A Benner fr P Beilke88001566
10/01/2001C H 2 M Hill-Table 1 - Surface water sampling results for compounds detected at San Pedro River sampling event, 10/012065151
10/02/2001Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Proposed workplan for water quality sampling & analysis of San Pedro River, w/encls88001784
10/04/2001William Ellett / AZ Dept of Environmental QualityRobert Gearheart / CA State Univ, Humboldt
Leo Leonhart / Hargis & Assoc, Inc
Andria Benner / Environmental Protection Agency - Region 9
Fecal coliform & streptococci sampling data w/TL to B Gearhart fr B Ellett88003846
10/04/2001Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Conditional approval re San Pedro River water quality sampling & analysis workplan2065152
10/10/2001Kristina Schaller / AZ Dept of Health Services - Bureau of Epidemiology & Disease Control ServicesJeanene Hanley / AZ Dept of Environmental QualityLtr: Review of Baseline public health evaluation & ecological assessment for site, dated 9/22/92, w/TL to A Benner fr W Ellett 10/25/20012065154
10/11/2001Keith Fritz / Southwest Hazard ControlPamela Beilke / Apache Nitrogen Products, IncRemediation & disposal rpt2065153
10/12/2001Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Requests extension of enhanced establishment period pilot test, northern area remediation system wetland (6/13/01)2065155
12/21/2001Hargis & Assoc, IncApache Nitrogen Products, IncSummary of San Pedro River sampling & analysis, 10/01, w/apps & TL to A Benner fr P Beilke (oversize drawing only)2064243
12/21/2001Hargis & Assoc, IncApache Nitrogen Products, IncSummary of San Pedro River sampling & analysis, 10/01, w/apps & TL to A Benner fr P Beilke, w/o oversize drawing88001567
01/07/2002Phillip Whitmore / C H 2 M Hill
Michael Zorba / C H 2 M Hill
Andria Benner / Environmental Protection Agency - Region 9Technical Memo: Split sampling results, w/TL fr P Whitmore 1/8/02 & attch2064180
03/04/2002Hargis & Assoc, IncApache Nitrogen Products, Inc2001 annual summary of groundwater & surface water monitoring program, w/apps & TL to A Benner fr P Beilke88001700
03/20/2002Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Proposed workplan for San Pedro River Phase 2 investigation, w/encls2064188
03/26/2002Hargis & Assoc, IncApache Nitrogen Products, IncRD/RA rpt, 1/1-12/31/01, w/TL to A Benner fr P Beilke2063074
04/08/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Transmits comments on applicability of monitored natural attenuation rpt, dated 6/29/01, w/attch2065126
04/09/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Conditional approval of San Pedro River phase 2 investigation workplan, w/attch2065127
04/10/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Comments on Characterization of groundwater systems in southern area, dated 4/27/01, w/attch2065128
04/10/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Transmits & discusses proposed agenda for 4/22-23/02 interagency technical mtgs re shallow aquifer & soils contamination, w/encl2065129
04/11/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Comments on supplemental FS rpt, media components 1 & 2B, dated 6/29/01, w/attch2065130
04/12/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Discusses & transmits comments on screening-level ecological risk assessment (SLERA), 6/6/01, w/attch2065131
04/29/2002Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Requests permission to resume running limited discharge, Northern area remediation system wetland2065132
05/03/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Proposed 5/8/02 technical mtg agenda, NARS (northern area remediation system) start-up & effluent recharge, w/encl2065133
05/06/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Further discussion needed re Northern area remediation system limited scale start-up approval, w/attchs2065134
05/17/2002Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Limited scale start-up, Northern area remediation system wetland, w/attchs2065135
05/20/2002Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 7/01-12/01, w/appendices & TL to A Benner fr P Beilke2065156
05/23/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Conditional approval for limited scale start-up of northern area remediation system (NARS)2065136
07/24/2002Hargis & Assoc, IncApache Nitrogen Products, IncRA implementation rpt for media components 4, 5 & 7, rev 1.0, w/apps & TLs88001659
07/24/2002Hargis & Assoc, IncApache Nitrogen Products, IncRemoval action implementation rpt for TNT-contaminated area rev 1.0, w/apps & TLs88001562
09/30/2002C H 2 M HillEnvironmental Protection Agency - Region 91st 5-year review rpt122071
10/29/2002Environmental Protection Agency - Region 9-Mtg Agenda: Interagency technical meeting re wetlands & shallow aquifer remedies, 11/13/2002 w/TL to P Beilke fr A Benner2064961
11/21/2002Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Northern area remediation system, proposed discharge treatability study plan w/encl2064235
11/25/2002Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 1/02-6/02, w/appendices & TL to A Benner fr P Beilke2064233
11/27/2002Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Approval of proposed discharge treatability study plan2064231
12/02/2002Environmental Protection Agency - Region 9-Mtg Agenda: Interagency technical meeting, 12/12/2002, w/TL to P Beilke fr A Benner2064225
01/23/2003Hargis & Assoc, Inc-Mtg Agenda: Technical mtg & field visit draft agenda, w/list of expected attendees, itinerary, tables & maps2010436
02/04/2003Ryan Loveridge / C H 2 M Hill
Brad Sample / C H 2 M Hill
Andria Benner / Environmental Protection Agency - Region 9Technical Memo: Evaluation of screening-level benchmarks for ecological receptors at site2065121
03/12/2003Hargis & Assoc, IncApache Nitrogen Products, Inc2002 annual summary of groundwater & surface water monitoring program, w/appendices & TL to A Benner fr P Beilke2010438
03/21/2003Hargis & Assoc, IncApache Nitrogen Products, IncRD/RA rpt, 1/1-12/31/02, w/TL to A Benner fr P Beilke2010439
04/07/2003Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 7/02-12/02, w/appendices & TL to A Benner fr P Beilke2015618
04/08/2003Hargis & Assoc, IncApache Nitrogen Products, IncNorthern area remediation system, 2003 treatability study for start-up, w/appendix & TL to A Benner fr L Leonhart 5/9/032015617
05/23/2003Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Approval of final draft rpt, Characterization of groundwater systems in southern area, dated 3/4/032065122
05/27/2003Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Final comments on supplemental FS rpt, media component 2B, rev 1.0, w/attch2065124
05/28/2003Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Transmits comments on applicability of monitored natural attenuation, revision 1 (3/4/03), w/attch2010441
05/29/2003Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Comments on draft final screening-level ecological risk assessment (SLERA), w/attch2065125
06/10/2003Hargis & Assoc, IncApache Nitrogen Products, IncCharacterization of groundwater systems in southern area, w/appendices, response summary for EPA comments & TL to A Benner fr P Beilke (oversize maps only)2015614
06/10/2003Hargis & Assoc, IncApache Nitrogen Products, IncCharacterization of groundwater systems in southern area, w/appendices, response summary for EPA comments & TL to A Benner fr P Beilke (w/o oversize maps)2015613
07/09/2003Hargis & Assoc, IncApache Nitrogen Products, IncApplicability of monitored natural attenuation, revision 2, w/appendices, response summary for EPA comments & TL to A Benner fr P Beilke2015615
07/09/2003Hargis & Assoc, IncApache Nitrogen Products, IncSan Pedro River summary of investigations, w/appendices & TL to A Benner fr P Beilke2010442
07/29/2003Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncEmail: Please send ltr requesting approval to begin discharge, w/history2066483
08/01/2003Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Requests permission to use alternate discharge location for northern area remediation system wetland , w/TL2065137
08/12/2003Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Email: Nitrate concentration below 30 mg/l - wetland discharge to alternate location2066484
08/28/2003Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncEmail: Monitoring for 2003 wetlands discharge during remainder of 20032064999
09/23/2003Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 1/03-6/03, w/appendices & TL to A Benner fr P Beilke2065003
10/16/2003Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Transmits omitted laboratory data sheets for applicability of monitored natural attenuation rpt, w/encl2010444
02/01/2004C H 2 M HillEnvironmental Protection Agency - Region 9Summary of soil analytical data, v1 of 5 (Black & Veatch 1988, Hargis & Bechtel 1994)2017223
02/01/2004C H 2 M HillEnvironmental Protection Agency - Region 9Summary of soil analytical data, v2 of 5 (Hargis & Bechtel 1994, cont)2017224
02/01/2004C H 2 M HillEnvironmental Protection Agency - Region 9Summary of soil analytical data, v3 of 5 (Hargis & Assoc 1997, 1999 & 2000)2017225
02/01/2004C H 2 M HillEnvironmental Protection Agency - Region 9Summary of soil analytical data, v4 of 5 (Hargis & Assoc 2000 cont, SRK Consulting 2000, Hargis 2001a)2017226
02/01/2004C H 2 M HillEnvironmental Protection Agency - Region 9Summary of soil analytical data, v5 of 5 (Hargis & Assoc 2001b, 2002a, 2002b, 2003)2017227
02/17/2004Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Comments on revised screening-level ecological risk assessment (SLERA), interim final, w/attchs2065035
02/18/2004Lee Decker / Gallagher & Kennedy (Attorneys)Pamela Beilke / Apache Nitrogen Products, IncLtr: Water quality standards applicable to discharge fr constructed treatment wetlands at site w/email TL to A Benner et al fr P Beilke2065036
02/23/2004Hargis & Assoc, IncApache Nitrogen Products, Inc2003 annual summary of groundwater & surface water monitoring program, w/appendices & TL to A Benner fr P Beilke2010452
03/01/2004Environmental Protection Agency - Region 9-Fact Sheet: Update on cleanup2016830
04/29/2004Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 7/03-12/03 & 2003 annual summary, w/appendices & TL to A Benner fr P Beilke2065758
05/05/2004Hargis & Assoc, IncApache Nitrogen Products, IncRD/RA rpt, 1/1-12/31/03, w/TL to A Benner fr P Beilke2063073
08/09/2004Environmental Protection Agency - Region 9-Mtg Agenda: Interagency technical meeting, 8/12/2004 w/TL to P Beilke fr A Benner 8/9/20042064213
08/10/2004Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncLtr: Comments on screening-level ecological risk assessment (SLERA) & preliminary baseline risk assessment - problem formulation, w/attch2064214
08/13/2004Jeanene Hanley / AZ Dept of Environmental QualityWilliam Ellett / AZ Dept of Environmental QualityMemo: Statistical evaluation of metals in ponds2064991
08/19/2004William Ellett / AZ Dept of Environmental QualityAndria Benner / Environmental Protection Agency - Region 9Ltr: Statistical evaluation of arsenic in pond sediments2064209
08/26/2004Karen Smith / AZ Dept of Environmental Quality - Water Quality DivPamela Beilke / Apache Nitrogen Products, IncLtr: Response to 4 requests made at 8/23/04 mtg, w/email TL to A Benner et al fr P Beilke 8/30/042066491
09/09/2004Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Email: Request for authorization to reduce frequency of ammonia sampling2066485
09/28/2004Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 1/04-6/04, w/TL to A Benner fr P Beilke2063068
10/26/2004Leo Leonhart / Hargis & Assoc, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Conceptualization of groundwater dynamics in Molinos Creek sub-aquifer, w/attchs (rev 11/29/04)2064197
11/01/2004Parsons CorpApache Nitrogen Products, IncScreening-level ecological risk assessment & preliminary baseline ecological risk assessment, final, w/TL to A Benner fr E Fendick 11/19/20042063069
11/18/2004Apache Nitrogen Products, Inc-Overheads: EPA site visit & technical mtg, 11/18/04-11/19/042065039
11/23/2004Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Email: Standards applicable to wash 3 - nitrate standards for ephemeral waters2066486
12/17/2004Hargis & Assoc, IncApache Nitrogen Products, IncSupplemental FS rpt for pond soils & sediments (CERCLA media component 3 & formerly active ponds), w/appendix A2065199
12/17/2004Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9TL: Supplemental FS rpt for pond soils & sediments (media component 3 & formerly active ponds)2064192
02/28/2005Hargis & Assoc, IncApache Nitrogen Products, Inc2004 annual summary of groundwater & surface water monitoring program, w/TL to A Benner fr P Beilke2063070
03/04/2005Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Response summary to EPA comments fr 2/7/05-2/11/05 on Supplemental FS rpt for pond soils & sediments (media component 3 & formerly active ponds), w/o attch2064978
03/24/2005Jeanene Hanley / AZ Dept of Environmental QualityWilliam Ellett / AZ Dept of Environmental QualityMemo: Status of beryllium cleanup levels, w/email TL to L Leonhart fr W Ellett 5/16/052066489
03/30/2005Stan Smucker / Environmental Protection Agency - Region 9Harrison Karr / Environmental Protection Agency - Region 9Email: Beryllium toxicity & cleanup standard for soils - outstanding proposed plan issues2066490
04/04/2005Hargis & Assoc, IncApache Nitrogen Products, IncSupplemental FS rpt for pond soils & sediments (CERCLA media component 3 & formerly active ponds), Rev 1.0, w/appendices for other soil areas & TL to A Benner fr P Beilke2063067
04/06/2005Hargis & Assoc, IncApache Nitrogen Products, IncSummary of operation & maintenance activities, northern area remediation system treatment wetland, 7/04-12/04 & 2004 annual summary, w/TL to A Benner fr P Beilke2063071
04/07/2005Jeanene Hanley / AZ Dept of Environmental QualityWilliam Ellett / AZ Dept of Environmental QualityMemo: Status of beryllium cleanup levels, w/TL to A Benner fr W Ellett 5/16/052065186
04/21/2005Andria Benner / Environmental Protection Agency - Region 9Pamela Beilke / Apache Nitrogen Products, IncEmail: Wetland discharge at primary location, & how to respond to odor complaints, w/history2066487
05/03/2005Hargis & Assoc, IncApache Nitrogen Products, IncRD/RA rpt, 1/1/04-12/31/04, w/TL to A Benner fr P Beilke2063072
05/11/2005Hargis & Assoc, IncApache Nitrogen Products, IncSupplemental FS rpt, media component 2B, revision 2.0, w/response summary & TLs to A Benner fr P Beilke (8/7/03, rev 5/11/05)2063075
05/18/2005Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Transmits comparison of wetland analyses fr 2002 to 5/05, w/attch2064994
06/02/2005Hargis & Assoc, IncApache Nitrogen Products, IncSummary of quarterly groundwater & surface water monitoring program 2/05, w/TL to A Benner fr P Beilke2065200
06/09/2005Pamela Beilke / Apache Nitrogen Products, IncAndria Benner / Environmental Protection Agency - Region 9Ltr: Transmits & discusses 5/26/05 chart showing continuous improvement in nitrate reduction through wetland treatment, 2002-2005, w/attch2066488
06/13/2005Environmental Protection Agency - Region 9-List of US EPA guidance documents consulted during preparation of the proposed plan2066324
07/01/2005Environmental Protection Agency - Region 9-Fact Sheet: EPA announces proposed plan for site2066325

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