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O’Connor Environmental, Inc. Geomorphology ▪ Hydrology ▪ Engineering Geology P.O. Box 794, Healdsburg, CA 95448 (707) 431-2810 |
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Regulatory Response and Permits · CEQA/NEPA Environmental Impact Analyses · Cal. Dept. of Forestry Timber Harvest Plan Geology Reports · Washington Department of Natural Resources / Cal. Dept. of Fish & Game 1600 Permits-Streambed · Alteration Agreements & Enforcement Response · Cal. Regional Water Quality Control Board Permits & Enforcement Response · Sonoma County Groundwater Reports · Water Scarce Areas · Napa County Hydrology & Geology Reports · US Army Corps of Engineers-Clean Water Act · Sec. 401/404 Wetlands & Waters of the US |
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Fluvial Geomorphology · Stream condition assessment · Habitat & channel restoration planning · Aquatic habitat analysis-salmon & steelhead · Monitoring of erosion and sedimentation · Sediment transport analysis
Hydrology · Hydrogeologic (groundwater) assessment · Stream & spring flow measurement · Channel capacity and hydraulics · Water balance/availability assessment · Water rights · Reservoir management
Watershed Science · Cumulative effects analysis · Sediment budgets · Riparian zone planning & management · Monitoring program design · Statistical analysis of monitoring data
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GIS and Mapping · Custom mapping and analyses · Land surveys using total station and GPS · Field surveys using custom electronic field forms and GPS · Hydraulic surface analysis from Digital Elevation models · Database design and management (Access or ArcMap)
Hydrologic Modeling · Distributed hydrologic modeling · Floodplain and flood hazard · Surface water / groundwater interaction · Water balance and water supply · Use of HEC-RAS, MODFLOW, GSSHA, MIKE SHE and other modeling software
Engineering Geology · Timber harvest plan geologic review · Slope stability assessment · Erosion source assessment & mitigation · Stream bank stabilization · Floodplain encroachment analysis |
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Our Services |
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Office Location: 447 Hudson St. Mailing Address: PO Box 794, Healdsburg, CA 95448 Ph (707) 431-2810 Fax (707) 473-9050 |



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OEI Project Locations |
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Central and Northern California |
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Home | Our Services | Modeling | Fluvial Geomorphology | Hydrology | Engineering Geology | GIS | Regulatory Permits | Watershed Science | Contact Our Staff |
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Watershed Studies Conducted by OEI in Montana, Idaho, Washington, Oregon and California |