* All samples, unless specifically noted, should use an EPA approved method or equivalent.

** Soil Vapor headspace analysis ³40ppm.

*** Visual evidence of contamination or soil vapor headspace ³10ppm.

****  For a sandy site, an additional investigation is needed if: 1) field PID screening levels in the remaining soil is greater than 40 ppm for a gasoline release, or greater than 10 ppm or visible contamination for a diesel or fuel oil release; or 2) the analytical result of the excavation base or sidewall soil sample is greater 50 mg/kg GRO/DRO; or 3) the analytical result of the excavation base or sidewall soil sample is less than 50 mg/kg GRO/DRO but ground water is within 25 feet of the surface.  For a silt or clay site, an additional investigation is needed if: 1) field PID screening levels in the remaining soil is greater than 40 ppm for a gasoline release, or greater than 10 ppm or visible contamination for a diesel or fuel oil release; or 2) the analytical result of the excavation base or sidewall soil sample is greater 100 mg/kg GRO/DRO.

Contact: Chai Insook, Minnesota Pollution Control Agency, 651-296-7718

E-mail: chai.insook@pca.state.mn.us

Web Site: http://www.pca.state.mn.us/cleanup/pubs/lustpubs.html

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