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Title

Montesano Groundwater Investigation of Leaking Underground Storage Tanks, October 2006 and March 2007

 
Publication number Date Published
08-03-011April 2008
VIEW NOW Montesano Groundwater Investigation of Leaking Underground Storage Tanks, October 2006 and March 2007 (Number of pages: 41) (Publication Size: 743KB)




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Author(s) Marti, P.
Description Groundwater samples for BTEX, TPH-G, and VOCs were collected in October 2006 and March 2007 from 25 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 ten wells, with concentrations ranging from 14 to 28,000 ug/L. TPH-G exceeded the cleanup level of 800 ug/L in eight wells (1200 to 490,000 ug/L). Tetrachloroethene exceeded the cleanup level of 5 ug/L in one Key Bank well.
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Contact Joan LeTourneau at 360-407-6764 or jlet461@ecy.wa.gov
Keywords Model Toxic Control Act, samples, storage, Grays Harbor, wells, tanks, water, toxic, underground storage tank, petroleum, leaking underground storage tanks, groundwater, chlorinated
WATERSHED Water Resource Inventory Area 22 Lower Chehalis
DATA Environmental Information Management (EIM) #PMART004

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