18051_Raleigh_Residence_Risk_Assess_VISL_20160505

1
Kady, Lebeed
From:Mort, Sandra L
Sent:Thursday, May 05, 2016 10:39 AM
To:Eckard, Sharon; Kady, Lebeed
Subject:FW: MW-7 + -8 Raleigh Residence
Attachments:Raleigh.Residence_slm_050516.xlsm
Critical effect analysis for MW‐7  & ‐8 combined maximum concentrations, assuming a residential inhalation exposure 
due to vapor intrusion, using a 20C GW temperature – 

The hazard index (HI) for potential nervous system impacts = 0.87, and the maximum combined HI for all other critical 
effects = 0.31. This analysis indicates that potential indoor air exposure risks do not exceed the cumulative non‐cancer 
risk criteria for a residential exposure scenario.  

See the attached VISL calculator. 
Sandy 
________________________________________
Sandy Mort
Environmental Toxicologist / Risk Assessor
Division of Waste Management – Hazardous Waste & Brownfields
NC Department of Environmental Quality

[phone] - Direct Line & Fax
[e-mail]

1646 Mail Service Center
Raleigh, NC 27699-1646

Email correspondence to and from this address is subject to the  
North Carolina Public Records Law and may be disclosed to third parties. 

From: Eckard, Sharon  
Sent: Thursday, May 05, 2016 10:18 AM 
To: Mort, Sandra L <[e-mail]>; Kady, Lebeed <[e-mail]> 
Subject: RE: MW‐7 + ‐8 Raleigh Residence 

Wells MW‐7 & MW‐8 are from the same stratigraphic layer: partially weathered rock so I do think that you could 
correctly interpret that both water samples were collected under similar formation conditions. 

Sharon Poissant Eckard, PG
Eastern District Supervisor
Division of Waste Management – Brownfields Program
NC Department of Environmental Quality

2
919.707.8379 direct line & fax
[e-mail]

217 W. Jones Street
1646 Mail Service Center
Raleigh, NC 27699-1646

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

From: Mort, Sandra L  
Sent: Thursday, May 05, 2016 10:05 AM 
To: Eckard, Sharon <[e-mail]>; Kady, Lebeed <[e-mail]> 
Subject: MW‐7 + ‐8 Raleigh Residence 
Importance: High 

Sharon & Labeed‐ 
When I combine the max concentrations for the 2 wells & use 20C GW temp, we are over the HQ of 1.0. It is also over at 
17.5C. So, I need to do a critical effect analysis. I’ll work on it now. ‐‐‐‐ Unless there is some compelling reason why we 
should look at these wells as separate entities. 
S 

________________________________________
Sandy Mort
Environmental Toxicologist / Risk Assessor
Division of Waste Management – Hazardous Waste & Brownfields
NC Department of Environmental Quality

[phone] - Direct Line & Fax
[e-mail]

1646 Mail Service Center
Raleigh, NC 27699-1646

Email correspondence to and from this address is subject to the  
North Carolina Public Records Law and may be disclosed to third parties. 

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