basic installers course. shared responsibility soil tester site evaluation ○ percolation ○...
TRANSCRIPT
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BASIC INSTALLERS COURSE
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SHARED RESPONSIBILITY SOIL TESTER
SITE EVALUATION○ PERCOLATION○ OTHER
PUBLIC HEALTH ENVIRONMENTALISTPLAN REVIEWINSPECTION & PERMITTING
INSTALLERINSTALLS ACCORDING TO PERMIT
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INSTALLERS VIEW POINT
SEES INFINETELY MORE GROUND
SOILS CAN CHANGE QUICKLY
SOIL TESTERS CAN MISS PROBLEMS
LAST CHANCE TO PREVENT FAILURE
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AREAS TO AVOID (CONVENTIONAL) CONCAVE LANDFORMS
TOESLOPESDEPRESSIONSDRAINAGEWAYSFLOODPLAINS
INDICATOR VEGETATIONWATER LOVING PLANTSHIGH BASE (pH) PLANTS
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CONDITIONS TO AVOID (CONVENTIONAL) WET
SMEARINGCOMPACTION
PLASTIC CLAYS (GUMBOS) OTHER RESTRICTIVE LAYERS
BEDROCKSOFT ROCKPANS (FRAGIPANS)SEASONAL WATER TABLES
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BEDROCK (HARD)
CANNOT DIG WITH SPADE OUTCROPS ON SLOPES ASSOCIATED WITH SPRINGS CAN PERCH WATER TILTED - CONDUIT TO WATER TABLE
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SOFT ROCK CAN DIG WITH SPADE (DIFFICULT) EASILY DUG WITH BACKHOE MISSED OR IGNORED BY TESTER CAN PERCH WATER CAN CAUSE SLOW PERCOLATION CAN ALSO BE TILTED BY ITSELF – LIKELY INADEQUATE
TREATMENT
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SOIL CHARACTERISTICS
PERMEABILITY (PERC) DRAINAGE (SEASONAL WETNESS) DEPTH TO RESTRICTIONS FLOODING FREQUENCY SLOPE
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SOIL LIMITATIONS PER RULES (CONVENTIONAL) LESS THAN 5 MIN/INCH PERC GREATER THAN 60 MIN/INCH PERC ANY RESTR. FEATURE W/IN 30 IN. FREQUENT FLOODING SLOPES GREATER THAN 25%
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PERMEABILITY
DETERMINED BY PORE SPACE SIZE & SHAPE DETERMINED BY
TEXTURESAND (COARSE)SILT (MEDIUM)CLAY (FINE)GRAVEL (TEXTURAL MODIFIER)
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WETNESS COLORS
GRAYSPOTS (MOTTLES)SOLID COLOR
RED & YELLOW MOTTLES BLACK
ORGANICSMANGANESE
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GOOD DRAINAGE COLORS SOLID COLORS (NO MOTTLES)
YELLOW (GOOD)BROWN (BETTER)RED (BEST)
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EXCEPTIONS TO COLOR INDICATORS WETNESS INDICATORS
RELIC (OLD)INHERITED (PARENT MATERIAL)
BROWN SOILS (SOME HAVE PANS) RED SOILS (SOME ARE CLAYEY)
LOW SHRINK-SWELL (GOOD)HIGH SHRINK-SWELL (BAD)
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INSTALLER INDUCED PROBLEMS COMPACTION (MORE LIKELY)
YELLOW & BROWN SOILSLOAMY, SILTY, SOME SANDYWHEN EXCESSIVELY WETRUBBER TIRE VS. TRACK
SMEARING (MORE LIKELY)CLAYS TOO WET
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FLOODING DEFINED – ANNUAL EVENT PROPOSED - > 50% CHANCE INDICATORS OF FREQUENT
FLOODINGORIENTED DEBRISWATER LINES ON TREESSUSPENDED TRASHSTREAM CHANNELING/SCOURING
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SLOPE
STEEP SLOPES (>25%)APPENDIX ITRENCH SPACINGTRENCH DEPTH
BENCHING OUTMAY ENCOUNTER RESTRICTIVE
LAYERS
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SUMMARY WETNESS COLORS
GRAY (SUBSOIL)BLACK (SURFACE)
PERMEABILITYPORE SIZE/SPACETEXTURECLAY TYPE
OTHER RESTRICTIONSPANSROCK (HARD & SOFT)