MO-4051_12019_G_RRA_19940816_Risk, Rank, and Abatement Ranking Form

GW TF-200
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Incident Name: Q_�� T�' �'"Aw L- iut Region/County Page 1 of 3
I (Y � 2�r/ i (N / C'C Ct r r c tz; 6/ 1 /92
Groundwater Incident File i �L'l Ranking Performed by: I4t r-ee) vu&,l I,_ er
Date: P"I L"
NORTH CAROLINA •
GROUNDWATER CONTANIINATION INCIDENT MANAGEMENT
SITE PRIORITY RANKING SYSTEM
(To be completed by Regional Office)
L nanNENT EAZARD ASSESSMENT
A Explosion - free product in confined areas or vapor phase product
detected at or above 20% of the lower explosive limit or at health concern levels;
award 50 points total
B. Fire- free product subject to ignition in exposed areas such as
surface water impoundments, streams, excavations, etc.; award 50
points total C'
313. EXPOSURE ASSESSMENT
A Contaminated Drinking Water Supplies
•L� -aS
1. Private, domestic water supply well containing substances in con-
b.n _ Del
hR �,(�d q �`�
centrations exceeding 15A NCAC 2L groundwater quality standards;
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award 10 points per well
2. Public or institutional water supply well containing substances in
concentrations exceeding ISA NCAC 2L groundwater quality
standards; award 20 points per well
3. E xceedances of Class WS-1 surface water quality standards as a
result of groundwater discharge; award 20 points per surface water
body impacted
4. If a water supply well identified in items 11. A I and 11. A 2 cannot be
replaced by an existing public water supply source requiring hook-
up only. award additional 10 points per irreplaceable well
B. Threat to Uncontaminated Drinking Water Supplies
1. Private, domestic water supply well located within 1500 feet down
gradient of contaminant source; award 10 points per well
2. Public or institutional water supply well located within 1500 feet
C'
downgradient of contaminant source; award I5 points per well
3. Raw surface water intake for public water supply located within 1/2
mile downgradient of contaminant source; award 5 points per water
C%
supply system
4. If any well identified in items II. B. I and 11. B. 2 or an intake in item
D. B. 3. are located within 250 feet of contaminant source; award
additional 20 points total (not per well or intake)
C. Vapor Phase Expoware
1. Product vapors detected in inhabitable bui3ding(s) below 200A of the lower
explosive limit or health concern Ievels; award 30 points total

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6/1/92
Points Awarded
.2. product vapors detected in other confined areas (uninhabitable build-
ings, sewer lines, utility vaults, etc.) below 20% of the lower explosive
limit; award 10 points total
ML SOURCE ASSESSMENT
A. UncontroDed or Unabated Primary Source (including dumpsites, stockpiles,
lagoons, land applications, septic tanks, landfills, underground and above
ground storage tanks, etc.)
1. Suspected or confirmed source remains in active use and continues to
receive raw product, wastewater or solid waste; award 30 points Per
source
2. Active use of suspected or confirmed source has been discontinued or
source was caused by a one-time release of product or waste, however.,
source continues to release product or contaminants into the environ-
ment; award 10 points per source
IV. ENVIRONMENTAL VULNERABn= ASSESSMENT
A. Vertical Contaminant Migration - Literature or well logs indicate that no confin-
ing layer is present above bedrock or within twenty feet of land surface;
award 10 points total
B. Horizontal Contaminant Migration - Data or observations indicate that no dis-
charge points or aquifer discontinuities eadst between the source and the
nearest downgradient drinking water supply; award 10 points total
C. Existing Groundwater Quality - The worst case monitor or supply well contains
contaminant levels:
1. At less than 10 times the 2L groundwater standards; award 5 points
2. Between 10 and 100 times the 2L groundwater standards; award 20
points
3. Greater than 100 times the 2L groundwater standards; award 40 points
V. REGIONAL OFFICE RESPONSE 0x TER RAND
Priority - (Site meets any = of the criteria)
2. Water supply well(s) contaminated and no alternate water supplies
available.
2. Vapors present in confined areas at explosive or health concern levels.
3. Treated surface water supply in violation of the safe drinking etandar'ds.
PrjoribLa - (Any One)
1. Water supply well(s) contaminated, but alternate water supplies avail-
able.
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GW/TF-200
Page 3 of 3
6/1/92
�2>1 Water supply well(s) within 1500 feet of site, but not contaminated and
no alternate water supplies available.
3. Vapors present in confined areas but not at explosive or health concern
Levels.
Priority C - (Both)
1. No water supply well(s) contaminted.
2. Water supply well(s) greater than 1500 feet from site, no alternate water
supply available
$lorijX D - (Both)
1. No water supply well(s) contaminted.
2. Water supply well(s) within 1500 feet of site but alternate water supplies
available. '
Priority E - (Both)
1. No water supply well(s) contaminated or within 1500 feet of site.
2. Area served by alternate water supply.
TOTAL POINTS AWARDED
M /Letter