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Title

Montesano Groundwater Investigation of Leaking Underground Storage Tanks, October 2005 and March 2006

 
Publication number Date Published
07-03-004January 2007
VIEW NOW Montesano Groundwater Investigation of Leaking Underground Storage Tanks, October 2005 and March 2006 (Number of pages: 30) (Publication Size: 332KB)




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Author(s) Marti, P.
Description Groundwater samples for BTEX, TPH-G, and VOCs were collected in October 2005 and March 2006 from 20 monitoring wells in downtown Montesano to determine the lateral extent of contamination in the surficial aquifer.

High concentrations of gasoline-range petroleum hydrocarbons were detected in wells from three source areas: Tony’s Short Stop/Grays Harbor Grange, Key Bank (Sterling)/Whitney’s Inc., and Brumfield-Twidwell. Benzene exceeded the MTCA Method A cleanup level of 5 ug/L in eleven wells, with concentrations ranging from 7.2 to 8400 ug/L. TPH-G exceeded the cleanup level of 800 ug/L in seven wells (990 to 78,000 ug/L). Tetrachloroethene exceeded the cleanup level of 5 ug/L in two wells.
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Keywords Model Toxic Control Act, samples, Grays Harbor, wells, tanks, toxic, leaking underground storage tanks, groundwater
WATERSHED Water Resource Inventory Area 22 Lower Chehalis
DATA Environmental Information Management (EIM) #PMART004

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