MPCA Design Guidance for Large Subsurface Wastewater ...

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E. Will further detailed investigation be necessary to assess potential phosphorus impacts to surface waters? Explain why or why not. _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ Design Guidance for Large Subsurface Minnesota Pollution Control Agency Wastewater Treatment Systems April 2010 41
Attachment 4A — Soils evaluation form All information requested on this boring log must be submitted to properly design the soil treatment and dispersal system. The method to observe and describe the soil is found in the USDA Field Book for Describing and Sampling Soils. Date: Vegetation: Project: Location: Landscape: Soil Survey Map Unit: Slope Form: Disturbed Soil: ____ Yes ____ No Slope: Type of Observation: pit boring auguring Floodplain: ____ Yes ____ No Depth (in) Horizon Designation Coarse Fragments Texture Matrix Color (Hue, Value, Chroma) Redox Features (abundance, size, contrast) Structure (Shape, Size, Grade) Consistency Roots (abundance and size) Pores (Quantity and size) Concretions Nodules Boundary Test pit ground surface elevation Depth to Seasonally Saturated Soil Depth of Standing Water in Hole/Pit (if any) Depth to Bedrock (if any) Proposed Bottom of System Elevation Estimated Infiltrative Loading Rate Design Guidance for Large Subsurface Minnesota Pollution Control Agency Wastewater Treatment Systems April 2010 42
Page 1 and 2: Design Guidance for Large Subsurfac
Page 3 and 4: Table of Contents Page Introduction
Page 5 and 6: How to Use This Guidance Document M
Page 7 and 8: 1. Knowing an MPCA permit is needed
Page 9 and 10: Table 1 Average Daily Flow for Four
Page 11 and 12: • depth to seasonally saturated s
Page 13 and 14: From this evaluation, a few tentati
Page 15 and 16: Permitting Option #1 may be mandato
Page 17 and 18: • Even distribution is necessary
Page 19 and 20: orings/wells may be allowed to be p
Page 21 and 22: Infiltration Trenches Plan View Sha
Page 23 and 24: Infiltration Trenches Plan View Sha
Page 25 and 26: The worksheet in Attachment 11 shal
Page 27 and 28: e. Seasonal operational changes —
Page 29 and 30: f. When mowed the drainfield inspec
Page 31 and 32: 5) A summary of any changes made to
Page 33 and 34: f. All soil test results (density,
Page 35 and 36: Attachment 1 — Knowing an MPCA pe
Page 37 and 38: Example 2: Flow for Other Establish
Page 39 and 40: Attachment 2 — Design flow consid
Page 41 and 42: W. Average daily ground water recha
Page 43: 3. Nitrogen impact assessment (for
Page 47 and 48: Attachment 5 — Pathogen treatment
Page 49 and 50: Attachment 5 (continued) — Remova
Page 51 and 52: Attachment 6 — Nitrate-nitrogen t
Page 53 and 54: Attachment 8 — Phosphorus treatme
Page 55 and 56: K _____ ft/day — saturated hydrau

MPCA Design Guidance for Large Subsurface Wastewater ...

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