missouri risk-based corrective action (mrbca) process for petroleum ...

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ACKNOWLEDGEMENTSThe Missouri Department of Natural Resources acknowledges the help provided by thestakeholders of the Groundwater Remediation Rule in the development of this process.These stakeholders, too many to individually list here, participated in numerous meetings,small subgroups, and conference calls. Their untiring efforts and support of the processare highly appreciated.MRBCA Guidance Document iFebruary 24, 2004Final Draft
FOREWORDThis guidance document describes the risk-based process that will be used by the TanksSection of the Missouri Department of Natural Resources (MDNR) to manage petroleumreleases at petroleum storage tank sites. This process is consistent with the policies andprocedures discussed by the Groundwater Remediation Rule stakeholders group anddocumented in their June 2003 Process Document.A draft of this guidance document was distributed to a large number of interestedstakeholders in November 2003 for comment. The department reviewed all of thecomments submitted and, as appropriate, revised the guidance document accordingly. Asummary of the comments is available at http://www.dnr.mo.gov/alpd/hwp/rbca-04-comments.pdf.This final document is a result of:• Policies agreed upon, and input received from, the stakeholders group,• MDNR’s experience in the management of petroleum impacted sites in Missouri,• Assistance provided by MDNR’s outside consultant, and• Review of comments received on the draft document.IMPLEMENTATION OF MISSOURI’S RISK-BASED CORRECTIVE ACTION(MRBCA) PROCESSThe MRBCA Process for Petroleum Storage Tanks is available for immediate use on anypetroleum storage tank site. Persons conducting site investigations of newly discoveredreleases are encouraged to use this new guidance.The MRBCA Process for Petroleum Storage Tanks replaces the following existingguidance of the Department of Natural Resources: Underground Storage Tank SiteCharacterization Guidance Document, February 1992; the Underground Storage TankCorrective Action Guidance Document, February 1992; and the Underground StorageTank Closure Guidance Document, March 1996.DEPARTMENT WEBSITE FOR IMPLEMENTATION OF MRBCAThis document and supporting forms are available on the web at:http://www.dnr.mo.gov/alpd/hwpDISCLAIMERNOTE: This document represents a final draft of a stakeholder workgroup that isattempting to formulate guidance for the implementation of Missouri's risk-basedcorrective action program for petroleum storage tank sites consistent both with themandate of SB 231 and various MDNR communications regarding the implementation ofrisk-based corrective action. While this document has been prepared in a consensusMRBCA Guidance Document iiFebruary 24, 2004Final Draft
Page 1: Missouri Department of Natural Reso
Page 5 and 6: ABBREVIATIONSAPI American Petroleum
Page 7 and 8: TABLE OF CONTENTSCOVER PAGEACKNOWLE
Page 9 and 10: 5.0 SITE CHARACTERIZATION AND OTHER
Page 11 and 12: 7.0 TIER 1 RISK ASSESSMENT 7-17.1 S
Page 13 and 14: 13.0 REFERENCES 13-1MRBCA Guidance
Page 15 and 16: Figure 4-3(b) Tank Excavation Sampl
Page 17 and 18: IMPORTANT CONTACT INFORMATIONAmeric
Page 19 and 20: MRBCA Guidance Document xviiiFebrua
Page 21 and 22: This document does not in any way r
Page 23 and 24: investigation resulting in confirma
Page 25 and 26: Details of Tier 1 risk assessment a
Page 27 and 28: Tier 1 RBTLs are generic target lev
Page 29 and 30: Site CharacterizationRegulatory Pol
Page 31 and 32: ANoConcentrationsExceed Tier 1Level
Page 33 and 34: Table 2-1Comparison of Risk Assessm
Page 35 and 36: 3.0SITE DISCOVERY AND INITIAL RESPO
Page 37 and 38: 3.4 INVESTIGATION OF CONFIRMED RELE
Page 39 and 40: Table 3-1Default Target LevelsChemi
Page 41 and 42: 4.3 CLOSURE OF TANKS BY EXCAVATION
Page 43 and 44: 4.4.2.2 Soil Sampling Requirements
Page 45 and 46: The samples must be collected from
Page 47 and 48: Sampling Background Conditions: If
Page 49 and 50: A groundwater investigation is requ
Page 51 and 52: 4.5.1 On-site Storage of Excavated
Page 53 and 54:
4.5.3 Disposal of Petroleum Contami
Page 55 and 56:
Exhibit 4-8Toxicity Characteristic
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To properly characterize deferred m
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Figure 4-1(a). Tank Floor Sampling
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Figure 4-2(a). Tank Excavation Samp
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Figure 4-3(a). Tank Excavation Samp
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Figure 4-4(a). Sampling for a Singl
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Figure 4-5(a). In-Place Closure of
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Figure 4-6(a). Wall Sampling After
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5.0SITE CHARACTERIZATION AND OTHER
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• Type of product released, and
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If data collected in the past does
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• Determine the types of material
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The land use map need not be drawn
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In the event that circumstances at
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Multiple samples from across the si
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predominant flow direction, estimat
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esidential receptors. For the subsu
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Step 2: From the point of release i
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All boreholes and probes greater th
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• Adequate QA/QC procedures must
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Type ofProductReleasedKnown?NoAYesG
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NFigure 5-2. An Example ofa Land Us
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Figure 5-3(b)ST #SOIL BORING LOGBOR
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Figure 5-4(b)ST #MONITORING WELL IN
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Table 5-1 (Page 2 of 3)Chemicals of
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Table 5-2Weight Percents for COCs i
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PAH’SCompound Method Water PQL So
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MRBCA LABORATORY REQUIREMENTSI. REQ
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for calibration or quantitation. Th
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7. Retention time windows are defin
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ATTACHMENT AEcological Risk Assessm
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7.b.) Is there a hydrogeological co
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6.0GENERAL CONSIDERATIONS FOR RISK
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• Local Zoning Ordinance(s),• C
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6.1.3 Human Exposure Pathways and R
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6.1.3.4 Pathways for GroundwaterPot
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Due to the limited number of COCs a
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6.3 EVALUATION OF GROUNDWATER USEWi
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ased on consideration of the follow
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6.4.1 Protection of StreamsProtecti
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criteria based on these routes of e
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• Ecotox Thresholds (ETs) as pres
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must be used. The specific equation
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Pathway complete?NoYesTier 1 evalua
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MCL Exists?YesUse MCLNoChemicalVola
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Identify Stream Classification10 CS
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Table 6-2Calculation of Representat
Page 149:
•••••
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Tables detailing the March 2005 soi
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Depth to Subsurface Soil Sources (d
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8.1.2 Groundwater ParametersDepth t
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Infiltration Rate (I) (Tier 1 defau
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Impacted AreayLeachatexzYW gaU gwZC
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• An explanation of data gaps tha
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Condition 4: Absence of ecological
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• Active remedial actions to redu
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10.4 NO FURTHER ACTION PROCEDUREWhe
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C. A Deed Notice is an informationa
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(5) a state regulation prohibiting
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12.2 SITE DISCOVERY12.2.1 Release/S
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12.2.4 System Test Report (narrativ
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• Intent of report: To provide re
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12.3.4 Soil Vapor Measurement Work
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- A discussion of ecological exposu
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12.4.3 Tier 3 Work PlanThe content
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o A description of the risk managem
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• Intent of work plan: The AUL Wo
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(investigative, remedial, or monito
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- A discussion of the composition o
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- Form No. Tier 1-7: Analytical Dat
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Total Petroleum Hydrocarbon Criteri
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APPENDIX AThis appendix has been in
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The procedure used to calculate Tie
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For a Tier 2 risk assessment, a com
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Soil Vapor Concentration: The soil
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INDOOR INHALATION OF VAPORS(CHILD A
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INGESTION AND INHALATION OF GROUNDW
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DERMAL CONTACT WITH CHEMICALS IN SU
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INHALATION OF VAPORS AND PARTICULAT
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Where:RBTL ss = Risk-based target l
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Where:RBTL ai-adj = Age-adjusted ri
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Where:RBTL ao-adj = Age-adjusted ri
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Where:RBTL w-adj = Age-adjusted ris
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Where:RBTL dcw-adj = Age-adjusted r
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Where:RBTL dcss-adj = Age-adjusted
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Where:RBTL ingss-adj = Risk-based t
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Where:RBTL ss-adj = Age-adjusted ri
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SUBSURFACE SOIL VAPOR CONCENTRATION
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GROUNDWATER CONCENTRATIONS PROTECTI
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VOLATILIZATION FACTORS(PARTICULAR E
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VOLATILIZATION FACTORS(SUBSURFACE S
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EFFECTIVE DIFFUSION COEFFICIENTSeff
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LEACHING FACTOR FROM SUBSURFACE SOI
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SOIL VAPOR CONCENTRATION AT WHICH V
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ALLOWABLE SOIL AND GROUNDWATER CONC
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STREAM PROTECTION: ALLOWABLE SOIL A
Page 250 and 251:
Table B-2Physical and Chemical Prop
Page 252 and 253:
Table B-3 (Page 2 of 2)Exposure Fac
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Table B-4 (Page 2 of 2)Fate and Tra
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The procedure used to quantitativel
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• Tier 2, Alternative 2: The soil
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The entity performing the work shal
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Pathway complete?NoYesTier 1 evalua
Page 264 and 265:
APPENDIX DA METHOD FOR DETERMINING
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epresentative value for the hydraul
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15Hydraulic Conductivity, gpd/ft 21
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APPENDIX EESTIMATION OF REPRESENTAT
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To calculate the representative con
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The MRBCA process requires the eval
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concentration of these samples may
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APPENDIX FCONSIDERATION OF TOTAL PE
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• All soil and groundwater sample
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with Tier 1 and Tier 2 target level
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APPENDIX GMRBCA REPORT FORMSForm No
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CLOSURE NOTICE FOR PETROLEUM RELEAS
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UNDERGROUND STORAGE TANK CLOSURE NO
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CHOOSE THE AREA BASED ON YOUR COUNT
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Risk-Based CorrectiveAction For Pet
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UNDERGROUND STORAGE TANK CLOSURE RE
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RESULTS OF SOIL ANALYSISFORM CR-2SI
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TIER 1 AND TIER 2 RISK ASSESSMENT R
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MAINMRBCACOVER PAGETABLE OF CONTENT
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TABLE OF CONTENTSSITE NO.: SUBMITTA
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FACILITY INFORMATION Tier 1-1SITE N
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RELEASE CHARACTERIZATION Tier 1-3SI
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SITE HYDROGEOLOGY Tier 1-5SITE NO.:
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ANALYTICAL DATA SUMMARY FOR SURFICI
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ANALYTICAL DATA SUMMARY FOR SUBSURF
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ANALYTICAL DATA SUMMARY FOR GROUNDW
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ANALYTICAL DATA SUMMARY FOR GROUNDW
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SOIL GEOTECHNICAL PARAMETERS* Tier
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EXPOSURE MODEL - OFF-SITE RESIDENT
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EXPOSURE MODEL - OFF-SITE NON-RESID
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EXPOSURE MODEL - OFF-SITE CONSTRUCT
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COMPARISON OF REPRESENTATIVE CONCEN
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Page 330 and 331:
Page 332 and 333:
Page 334 and 335:
Page 336 and 337:
Page 338 and 339:
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Risk-Based CorrectiveAction For Pet
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TIER 2 FATE AND TRANSPORT PARAMETER
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Page 346 and 347:
Page 348 and 349:
Page 350 and 351:
Page 352 and 353:
Page 354 and 355:
Page 356 and 357:
TIER 2 APPLICABLE TARGET LEVELS FOR
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