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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

Soil Sampling and Geo-Technical Investigations

Before construction, crews mark utility locations then drill holes in street pavement and collect soil, water and pavement samples at various locations. Analyzing the samples helps project designers decide which construction methods to use. The holes are a few inches in diameter and are filled immediately after drilling is completed. The work may temporarily close traffic lanes or prohibit on-street parking and may cause brief periods of noise, dust and mild vibration. Work at each location generally lasts about one hour.