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HRS rule, Table 4-2, Pages 51609-51610

Containment Factor Values for Surface Water Migration Pathway
Source Assigned value
All Sources (Except Surface Impoundments, Land Treatment, Containers, and Tanks)  
Evidence of hazardous substance migration from source area (i.e., source area includes source and any associated containment structures) 10
No evidence of hazardous substance migration from source area and:  

(a) Neither of the following present: (1) maintained engineered cover, or (2) functioning and maintained run- on control system and runoff management system.

10

(b) Any one of the two items in (a) present

9

(c) Any two of the following present: (1) maintained engineered cover, or (2) functioning and maintained run- on control system and runoff management system, or (3) liner with functioning leachate collection and removal system immediately above liner.

7

(d) All items in (c) present

5

(e) All items in (c) present, plus no bulk or non-containerized liquids nor materials containing free liquids deposited in source area.

3
No evidence of hazardous substance migration from source area, double liner with functioning leachate collection and removal system above and between liners, and:  

(f) Only one of the following deficiencies present in containment; (1) bulk or noncontainerized liquids or materials containing free liquids deposited in source area, or (2) no or nonfunctioning or nonmaintained run-on control system and runoff management system, or (3) no or nonmaintained engineered cover.

3

(g) None of the deficiencies in (f) present

0
Source area inside or under maintained intact structure that provides protection from precipitation so that neither runoff nor leachate is generated, liquids or materials containing free liquids not deposited in source area, and functioning and maintained run-on control present.  
 
Surface Impoundment  
 
Evidence of hazardous substance migration from surface impoundment. 10
Free liquids present with either no diking, unsound diking, or diking that is not regularly inspected and maintained. 10
No evidence of hazardous substance migration from surface impoundment, free liquids present, sound diking that is regularly inspected and maintained, adequate freeboard, and:  

(a) No liner

9

(b) Liner

7

(c) Liner with functioning leachate collection and removal 5 system below liner.

5

(d) Double liner with functioning leachate collection and removal system between liners.

3
No evidence of hazardous substance migration from surface impoundment and all free liquids eliminated at closure (either by removal of liquids or solidification of remaining wastes and waste residues). Evaluate using All Sources criteria (with no bulk or free liquids deposited).
 
Land Treatment  
 
Evidence of hazardous substance migration from land treatment zone. 10
No functioning and maintained run-on control and runoff management system 10
No evidence of hazardous substance migration from land treatment zone and:  

(a) Functioning and maintained run-on control and runoff management system.

7

(b) Functioning and maintained run-on control and runoff managementsystem, and vegetative cover established over entire land treatment area.

5

(c) Land treatment area maintained in compliance with 40 CFR 264.280.

0
 
Containers  
 
All containers buried Evaluate using All Sources criteria.
Evidence of hazardous substance migration from container area (i.e., container area includes containers and any associated containment structures). 10
No diking (or no similar structure) surrounding container area. 10
Diking surrounding container area unsound or not regularly inspected and maintained. 10
No evidence of hazardous substance migration from container area container area surrounded by sound diking that is regularly inspected and maintained. 9
No evidence of hazardous substance migration from container area, container area surrounded by sound diking that is regularly inspected and maintained, and: 9

(a) Essentially impervious base under container area with liquids collection and removal system.

7

(b) Containment system includes essentially impervious base, liquids collection system, sufficient capacity to contain 10 percent of volume of all containers, and functioning and maintained run-on control; and spilled or leaked hazardous substances and accumulated precipitation removed in timely manner to prevent overflow of collection system, at least weekly inspection of containers, hazardous substances in leaking or deteriorating containers transferred to containers in good condition, and containers sealed except when waste is added.

5

(c) Free liquids present, containment system has sufficient capacity to hold total volume of all containers and to provide adequate freeboard, and single liner under container area with functioning leachate collection and removal system below liner.

5

(d) Same as (c) except: double liner under container area with functioning leachate collection and removal system between liners.

3
Containers inside or under maintained intact structure that provides protection from precipitation so that neither runoff nor leachate would be generated from any unsealed or ruptured containers, liquids or materials containing free liquids not deposited in any container, and functioning and maintained run-on control present. 0
No evidence of hazardous substance migration from container area, containers leaking, and all free liquids eliminated at closure (either by removal of liquids or solidification of remaining wastes and waste residues). Evaluate using All Sources criteria (with no bulk or free liquids deposited).
 
Tank
 
Below-ground tank Evaluate using All Sources criteria
Evidence of hazardous substance migration from tank area (i. e., tank area includes tank, ancillary equipment such as piping, and any associated containment structures). 10
No diking (or no similar structure) surrounding tank and ancillary equipment. 10
Diking surrounding tank and ancillary equipment unsound or not regularly inspected and maintained. 10
No evidence of hazardous substance migration from tank area and tank and ancillary equipment surrounded by sound diking that is regularly inspected and maintained. 9
No evidence of hazardous substance migration from tank area, tank and ancillary equipment surrounded by sound diking that is regularly inspected and maintained, and:

(a) Tank and ancillary equipment provided with secondary containment (e.g., liner under tank area, vault system, double-wall) with leak detection and collection system.

7

(b) Tank and ancillary equipment provided with secondary containment system that detects and collects spilled or leaked hazardous substances and accumulated precipitation and has sufficient capacity to contain 110 percent of volume of largest tank within containment area, spilled or leaked hazardous substances and accumulated precipitation removed in a timely manner, at least weekly inspection of tank and secondary containment system, and all leaking or unfit-for-use tank systems promptly responded to.

5

(c) Containment system has sufficient capacity to hold total volume of all tanks within the tank containment area and to provide adequate freeboard, and single liner under tank containment area with functioning leachate collection and removal system below liner.

5

(d) Same as (c) except: double liner under tank containment area with functioning leachate collection and removal system between liners.

3
Tank is above ground, and inside or under maintained intact structure that provides protection from precipitation so that neither runoff nor leachate would be generated from any material released from tank, liquids or materials containing free liquids not deposited in any tank, and functioning and maintained run-on control present. 0

 

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