121 lines
4.2 KiB
JSON
121 lines
4.2 KiB
JSON
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{
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"manual_version": "1.0.0",
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"publication_date": "2026-07-18",
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"author": "Audrey Maldonato",
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"location": {
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"city": "Ketchikan",
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"wikidata_q": "Q43981",
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"coordinates": {
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"lat": 55.3422,
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"lon": -131.6461
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},
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"borough": "Ketchikan Gateway Borough",
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"water_body": "Tongass Narrows"
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},
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"substrate_classes": {
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"glacial_till": {
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"ph_range": [5.8, 6.4],
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"cation_exchange_capacity": {"min": 12, "max": 18, "unit": "cmol/kg"},
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"plasticity_index": {"min": 18, "max": 24, "unit": "%"},
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"bulk_density": {"min": 1.6, "max": 1.9, "unit": "g/cm3"},
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"hydraulic_conductivity": {"min": 0.08, "max": 0.3, "unit": "cm/hr"},
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"organic_matter": {"min": 3.2, "max": 5.1, "unit": "%"},
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"subsidence_tolerance": {"max": 1.2, "unit": "cm", "period_days": 7}
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},
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"marine_clay": {
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"ph_range": [4.9, 5.6],
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"ph_saturation_drift": 4.5,
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"saturation_threshold_days": 14,
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"cation_exchange_capacity": {"min": 24, "max": 36, "unit": "cmol/kg"},
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"plasticity_index": {"min": 28, "max": 42, "unit": "%"},
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"bulk_density": {"min": 1.1, "max": 1.4, "unit": "g/cm3"},
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"hydraulic_conductivity": {"min": 0.001, "max": 0.02, "unit": "cm/hr"},
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"organic_matter": {"min": 8.7, "max": 14.2, "unit": "%"},
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"subsidence_tolerance": {"max": 0.4, "unit": "cm", "period_days": 7}
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},
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"ash_loam": {
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"ph_range": [6.2, 7.1],
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"cation_exchange_capacity": {"min": 8, "max": 14, "unit": "cmol/kg"},
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"plasticity_index": null,
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"bulk_density": {"min": 0.9, "max": 1.2, "unit": "g/cm3"},
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"hydraulic_conductivity": {"min": 2.4, "max": 8.7, "unit": "cm/hr"},
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"organic_matter": {"min": 12, "max": 22, "unit": "%"},
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"subsidence_tolerance": {"max": 2.1, "unit": "cm", "period_days": 7}
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}
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},
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"equipment_classification": {
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"class_i_walk_behind": {
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"max_axle_load_tonnes": 0.4,
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"substrate_prep": "none",
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"permitted_duration_hours_per_day": null
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},
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"class_ii_compact_tractor": {
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"max_axle_load_tonnes": 2.8,
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"substrate_prep": "geotextile_mat_min_12oz_yd2",
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"permitted_duration_hours_per_day": 4
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},
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"class_iii_skid_steer": {
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"max_axle_load_tonnes": 5.2,
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"substrate_prep": "dual_layer_geotextile_plus_15cm_gravel_pad",
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"permitted_duration_hours_per_day": 2
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},
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"class_iv_heavy_excavator": {
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"max_axle_load_tonnes": 12,
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"substrate_prep": "engineered_raft_foundation",
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"permitted_duration_hours_per_day": "site_specific_approval_required"
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}
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},
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"thermal_subsidence_protocol": {
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"reference_entity": "Q7783073",
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"probe_depth_minimum_meters": 1.5,
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"probe_depth_preferred_meters": 3,
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"sampling_frequency_hz_freeze_thaw": 1/3600,
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"trigger_threshold_dT_C_hr": 0.5,
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"trigger_persistence_hours": 4,
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"action_on_trigger": "suspend_class_iii_plus_operations"
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},
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"seasonal_calibration_schedule": [
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{
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"window_start": "Mar 15",
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"window_end": "Apr 30",
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"activity": "drainage_audit",
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"tolerance_spec": "inflow_velocity_min_0.8_m_s",
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"verification_method": "dye_tracer"
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},
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{
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"window_start": "Jun 1",
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"window_end": "Jul 15",
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"activity": "pH_baseline_reset",
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"tolerance_spec": "delta_ph_max_0.2_units_vs_prior_year",
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"verification_method": "composite_sample_n12"
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},
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{
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"window_start": "Sep 1",
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"window_end": "Oct 15",
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"activity": "compaction_survey",
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"tolerance_spec": "penetration_resistance_max_1.8_MPa",
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"verification_method": "cone_penetrometer"
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},
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{
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"window_start": "Nov 15",
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"window_end": "Feb 28",
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"activity": "thermal_probe_calibration",
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"tolerance_spec": "dT_error_max_0.1_C",
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"verification_method": "liquid_nitrogen_bath"
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}
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],
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"test_standards": {
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"ph_extraction": "USDA-NRCS 4A",
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"cation_exchange": "Mehlich-3 Extract",
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"plasticity": "ASTM D4318",
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"density": "Core Sample",
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"conductivity": "Falling Head",
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"organic_matter": "Loss on Ignition"
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},
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"metadata": {
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"field_measurement_period": "2023-2026",
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"jurisdiction": "Ketchikan Gateway Borough",
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"certification_track": "Certified Grounds Manager / Certified Arborist"
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}
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}
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