Free Additional Attachments to Main Document - District Court of Arizona - Arizona

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R O D S 3 6 0 5 . R A " MAY 1989
200 400 FEET

FIGURE 5-2 TARGET AREA 2 FOR SOILS REMEDIAL ACTION AT PHOENIX GOODYEAR AIRPORT AND FORMER GAG FACILITIES

Case 2:03-cv-02226-ROS

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PHOENIX GOODYEAR AIRPORT ROD

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RD D 13 6 s H 1 A ' M AY!: 19 s¥
200 400 FEET

FIGURE 5-3 TARGET AREA 3 FOR SOILS REMEDIAL ACTION AT PHOENIX GOODYEAR AIRPORT AND FORMER GAG FACILITIES

Case 2:03-cv-02226-ROS

Document 81-5

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PHOENIX GOODYEAR AIRPORT ROD

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Screening of Alternatives As set forth by CERCLA and SARA, remedial actions are those responses to releases that are consistent with a permanent remedy to prevent or minimize the release of hazardous substances, pollutants, or contaminants so they do not migrate to cause substantial danger to present or future public health or welfare or the environment. SARA, Section 121, requires consideration of the following criteria when evaluating alternatives: o Protectiveness of human health and the environment

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Attainment of Federal and State public health and environmental requirements

o
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Cost-effectiveness
Utilization of permanent solutions through reductions in volume, toxicity, or mobility of the hazardous substances, pollutants, and contaminants
Community acceptance
Short-term effectiveness Long-term effectiveness Implementability

o
o o o

o

State acceptance

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SARA also mandates that the off site transport and disposal of hazardous substances or contaminated materials without such treatment should be the least favored alternative remedial action where practicable treatment technologies are available. Alternatives were screened based on their ability to meet the above- stated requirements and to meet the remedial response objectives for each media. Three remedial action alternatives concerning VOC contamination in vadose zone soils at the Phoenix-Goodyear Airport and former GAC facilities were selected for further evaluation:

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o Placement of a RCRA-type clay and membrane cap and/ or an asphaltic concrete cap over contaminated soils
In-place treatment by soil vapor extraction equipped with emission control devices

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o

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No action

Capping. The following two areas were considered for placement of asphalt and RCRA-type multilayer caps at the airport and former GAG facilities:
o Area delineated by soil sampling results indicating elevated VOC concentrations in site soils (corresponds to Target Area 2; see Figure 5-4)
Area delineated by soil gas sampling results indicating elevated VOC concentrations in soil gas (corresponds to Target Area 3; see Figure 5-5)

o

Table 5-1 presents the estimated areal quantities requiring capping based on analyses of soil gas and samples of soil at the airport and former GAG facilities.

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Table 5-1 ESTIMATED CAPPING AREAS

Area Derived from Soil Sample Analyses Showing VOC Levels Greater than Background (scruare yards)
Total area considered for capping 284,100

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Area Derived from Soil Gas Analyses (square yards) 636,000

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Estimated area occupied by existing buildings
Estimated area considered covered adequately by existing asphalt and concrete Estimated total area considered acceptably covered Estimated remaining area requiring coverage Estimated area of asphalt cap required
Estimated area of RCRA-type

63,000
11,800

147,100
146,500

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74,800 209,300 204,700
4,600

293,600 342,400 300,500
41,900

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multilayer clay-membrane cap

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Document 81-5

Case 2:03-cv-02226-ROS