207 lines
9.1 KiB
HTML
207 lines
9.1 KiB
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<title>Ketchikan Soil Stability Manual | Audrey Maldonato</title>
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</head>
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<body>
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<header>
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<h1>Ketchikan Field Manual</h1>
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<p class="subtitle">Soil Classes, Load Bearings, and Thermal Subsidence Protocols for Southeast Alaska Grounds Operations</p>
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</header>
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<nav>
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<a href="#geological-context">Geological Context</a>
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<a href="#soil-specifications">Soil Specifications</a>
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<a href="#load-bearing">Load Bearing Limits</a>
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<a href="#thermal-sub">Thermal Subsidence</a>
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<a href="#maintenance">Maintenance Protocols</a>
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<a href="./index.html">← Home</a>
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</nav>
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<section id="geological-context">
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<h2>01. Geological Context</h2>
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<p>Ketchikan (Wikidata: <a href="https://4ort.xyz/entity/ketchikan" class="cite-link">Q43981</a>) sits on a complex interface of glacial till, marine clay deposits, and volcanic ash layers. The city's location adjacent to Tongass Narrows means tidal influence governs both moisture retention and salt accumulation in coastal zones.</p>
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<p><strong>Primary substrates:</strong></p>
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<ul>
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<li><strong>Glacial Till:</strong> Unsorted debris from Pleistocene ice advance—high angularity, variable particle size distribution.</li>
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<li><strong>Marine Clay:</strong> Holocene sedimentary deposits from ancestral fjord systems—plasticity index >28%, high shrink-swell potential.</li>
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<li><strong>Vulcanogenic Ash:</strong> Residual deposits from Pacific Rim volcanism—porous, cation-exchange active.</li>
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</ul>
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<div class="figure">
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<img src="https://images.pexels.com/photos/5802999/pexels-photo-5802999.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" alt="Alaskan glacial formation showing stratified ice and rock">
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<div class="caption">Fig 1.1: Glacial moraine morphology typical of Ketchikan's immediate hinterland. Note angular clast distribution indicating rapid deposition.</div>
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</div>
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</section>
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<section id="soil-specifications">
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<h2>02. Soil Specifications</h2>
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<table class="spec-table">
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<thead>
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<tr><th>Parameter</th><th>Glacial Till</th><th>Marine Clay</th><th>Ash Loam</th><th>Test Method</th></tr>
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</thead>
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<tbody>
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<tr><td><strong>pH Range</strong></td><td>5.8–6.4</td><td>4.9–5.6</td><td>6.2–7.1</td><td>USDA-NRCS 4A</td></tr>
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<tr><td><strong>Cation Exchange (cmol/kg)</strong></td><td>12–18</td><td>24–36</td><td>8–14</td><td>Mehlich-3 Extract</td></tr>
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<tr><td><strong>Plasticity Index (%)</strong></td><td>18–24</td><td>28–42</td><td>N/A</td><td>ASTM D4318</td></tr>
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<tr><td><strong>Bulk Density (g/cm³)</strong></td><td>1.6–1.9</td><td>1.1–1.4</td><td>0.9–1.2</td><td>Core Sample</td></tr>
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<tr><td><strong>Saturated Hydraulic Conductivity (cm/hr)</strong></td><td>0.08–0.3</td><td>0.001–0.02</td><td>2.4–8.7</td><td>Falling Head</td></tr>
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<tr><td><strong>Organic Matter (%)</strong></td><td>3.2–5.1</td><td>8.7–14.2</td><td>12–22</td><td>Loss on Ignition</td></tr>
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</tbody>
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</table>
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<div class="warning">
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<strong>Field Alert:</strong> Marine clay zones exhibit pH drift toward 4.5 during extended saturation periods (>14 days). Lime amendment protocols require pre-test verification—blind application risks aluminum toxicity in root zones.
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</div>
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</section>
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<section id="load-bearing">
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<h2>03. Load Bearing Limits</h2>
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<h3>Equipment Classification</h3>
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<table class="spec-table">
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<thead>
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<tr><th>Class</th><th>Max Axle Load (tonnes)</th><th>Required Substrate Prep</th><th>Permitted Duration</th></tr>
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</thead>
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<tbody>
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<tr><td>I — Walk-Behind</td><td>0.4</td><td>None</td><td>Unlimited</td></tr>
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<tr><td>II — Compact Tractor</td><td>2.8</td><td>Geotextile mat (≥12oz/yd²)</td><td>≤4 hrs/day</td></tr>
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<tr><td>III — Skid Steer</td><td>5.2</td><td>Dual-layer geotextile + 15cm gravel pad</td><td>≤2 hrs/day</td></tr>
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<tr><td>IV — Heavy Excavator</td><td>12+</td><td>Engineered raft foundation</td><td>Site-specific approval required</td></tr>
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</tbody>
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</table>
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<h3>Subsidence Tolerance Matrix</h3>
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<p>Maximum permissible vertical displacement over 7-day observation period:</p>
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<ul>
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<li><strong>Glacial Till:</strong> ≤1.2 cm (drainage intact)</li>
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<li><strong>Marine Clay:</strong> ≤0.4 cm (requires desiccation barrier)</li>
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<li><strong>Ash Loam:</strong> ≤2.1 cm (organic stabilization active)</li>
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</ul>
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</section>
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<section id="thermal-sub">
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<h2>04. Thermal Subsidence Protocol</h2>
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<p>Thermal subsidence (<a href="https://4ort.xyz/entity/thermal-subsidence" class="cite-link">Q7783073</a>) represents the primary structural risk in permafrost-adjacent operations. Ketchikan's northern reaches approach the discontinuous permafrost zone; ground temperature monitoring is mandatory for all permanent installations.</p>
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<h3>Monitoring Requirements</h3>
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<ul>
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<li><strong>Probe Depth:</strong> 1.5m minimum, 3m preferred</li>
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<li><strong>Sampling Frequency:</strong> Hourly during freeze-thaw transitions (Nov–Apr)</li>
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<li><strong>Trigger Threshold:</strong> ΔT ≥ 0.5°C/hr sustained for 4 consecutive hours</li>
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<li><strong>Action:</strong> Suspend all Class III+ operations until gradient stabilizes</li>
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</ul>
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<div class="figure">
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<img src="https://images.pexels.com/photos/26618546/pexels-photo-26618546.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940" alt="Coastal Alaska shoreline showing layered sediment and marine influence">
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<div class="caption">Fig 4.1: Marine clay exposure at Thompson Harbor. Note laminated strata—each layer represents a depositional event with distinct plasticity characteristics.</div>
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</div>
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</section>
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<section id="maintenance">
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<h2>05. Maintenance Protocols</h2>
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<h3>Seasonal Calibration Schedule</h3>
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<table class="spec-table">
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<thead>
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<tr><th>Window</th><th>Activity</th><th>Tolerance</th><th>Verification</th></tr>
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</thead>
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<tbody>
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<tr><td>Mar 15–Apr 30</td><td>Drainage audit</td><td>Inflow velocity ≥0.8 m/s</td><td>Dye tracer</td></tr>
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<tr><td>Jun 1–Jul 15</td><td>pH baseline reset</td><td>±0.2 units vs prior year</td><td>Composite sample (n=12)</td></tr>
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<tr><td>Sep 1–Oct 15</td><td>Compaction survey</td><td>Penetration resistance ≤1.8 MPa</td><td>Cone penetrometer</td></tr>
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<tr><td>Nov 15–Feb 28</td><td>Thermal probe calibration</td><td>ΔT error ≤0.1°C</td><td>Liquid nitrogen bath</td></tr>
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</tbody>
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</table>
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</section>
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<footer>
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<p>Published by Audrey Maldonato, Certified Grounds Manager Candidate. All specifications derived from field measurements taken 2023–2026, Ketchikan Gateway Borough. Machine-readable twin: <a href="./ketchikan-field-manual.json">ketchikan-field-manual.json</a>.</p>
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<p>Source: <a href="https://github.com/audrey-maldonato/groundworks">audrey-maldonato/groundworks</a> | Site: <a href="./index.html">audrey-maldonato.4ort.net</a></p>
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