API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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3.A-26 API RECOMMENDED PRACTICE 581d) Subsurface Soil—A release of petroleum products contaminates subsurface soils. Subsurface impactsmay or may not be contained within the physical property boundary limits of the facility. Subsurface soilsrefer to soils deeper than 0.61 m (2 ft) in depth or those soils that cannot be readily removed in theevent of a spill, such as soils beneath a field erected tank or building slab. The soil permeability, storedmaterial properties, and location of the spill are important in determining the extent of the environmentalconsequences associated with subsurface soil impacts. For example, a release of petroleum from anAST bottom that rests on native clay soils will have minor subsurface impacts relative to the same ASTthat is located on native sand soil.e) Groundwater—A release of petroleum products contaminates groundwater. Groundwater refers to thefirst encountered phreatic water table that may exist subsurface at a facility. Groundwater elevation mayfluctuate seasonally and different groundwater tables may exist at a site (e.g. possible shallow soil watertable and a deep bedrock water table). The soil permeability, stored material properties, and location ofthe spill are important in determining the extent of the environmental consequences associated withgroundwater impacts. The nature of the subsurface soils will dictate the time required for a spill toimpact the groundwater and the severity of the impact.f) Surface Water—A release of petroleum products contaminates off-site surface water. Conveyance ofspilled product to surface waters is primarily by overland flow, but may also occur through subsurfacesoils. Surface water refers to non-intermittent surficial waters from canals, lakes, streams, ponds,creeks, rivers, seas, or oceans and includes both fresh and salt water. Surface waters may or may notbe navigable. The stored material properties, type of surface water, and response capabilities areimportant in determining the extent of the environmental consequences associated with surface waterimpacts.The cleanup costs associated with these environmental impacts are provided in Part 3, Table 6.6 as afunction of environmental sensitivity. The environmental sensitivity is given as Low, Medium, or High anddetermines the expected cost factor per barrel of spilled fluid for environmental cleanup in a worst-case scenario.3.A.5.9 TablesTable 3.A.5.1—Summary of API Members’ Aboveground Storage Tank Facilities Relative to TankBottom LeakagePopulationDescriptionNumber ofTanksPercent withBottom Leaks inLast 5 YearsNumber withBottom Leaks inLast 5 YearsTank Years(see Note)Bottom LeakFrequency(1988 to 1993)Tanks < 5 years old 466 0.9% 4 2,330 1.7 × 10 −3Tanks 6 to 15 years old 628 3.8% 24 3,140 7.6 × 10 −3Tanks > 15 years old 9,204 3.8% 345 46,020 7.5 × 10 −3All tanks in survey 10,298 3.6% 373 51,490 7.2 × 10 −3NOTETank years = number of tanks × average number of years in service.
CONTENTS1 GENERAL……………………………………………………………………………………………………… 12 TABLES………………………………………………………………………………………………………… 23.B-1
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Risk-Based Inspection MethodologyAP
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ForewordNothing contained in any AP
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CONTENTS1 SCOPE ...................
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1-2 API RECOMMENDED PRACTICE 5811.4
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PART 2PROBABILITY OF FAILURE METHOD
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5.8 Figures .......................
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12.7 Nomenclature .................
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19.6 Determination of the Damage Fa
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Risk-Based Inspection MethodologyPa
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RISK-BASED INSPECTION METHODOLOGY,
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CONTENTSTABLE 2.A.1—LEADERSHIP AN
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PART 2, ANNEX 2.BDETERMINATION OF C
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2.B.8 AMINE CORROSION .............
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CONTENTSOVERVIEW ..................
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PART 3CONSEQUENCE OF FAILURE METHOD
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4.6.5 Releases to the Environment .
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5.9.7 Determination of Final Toxic
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Page 513 and 514: CONTENTS3.A.1 GENERAL .............
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Page 547 and 548: PART 5SPECIAL EQUIPMENT5-1
Page 549 and 550: Consequence of Failure Methodology
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CONTENTS5.A.1 General .............
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API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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