Field methods for probe installation 300311

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Presentation from Keith Wilkinson about the equipment installation strategy. Will be supplemented by Nicole Metje on the day

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Field methods for probe installation 300311

  1. 1. Strategyfor Harnhill<br />Plan view<br />Hand excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />c. 0.15m<br />‘Geology’<br />‘Geology’<br />Ditch fill<br />Step 1. Trench surveyed in and present soil removed by hand to the level of the underlying geology / top of the uppermost ditch fill. Artefacts are recovered.<br />
  2. 2. Strategyfor Harnhill<br />Plan view<br />Cores inside ditch<br />Hand excavated trench<br />Cores outside ditch (not Cherry Copse)<br />Ditch<br />Hand excavate ditch fills<br />Cross section view<br />c. 0.55m<br />Present soil<br />c. 0.15m<br />‘Geology’<br />‘Geology’<br />Ditch fills<br />Step 2. Ditch fills are removed separately by hand until the ‘geology’ is reached. Artefacts recovered from each ditch fill are kept separate. Total station/GPS measurements are taken on the surface of the ‘geology’ to produce a surface model. Cores collected.<br />
  3. 3. Strategyfor Harnhill<br />Plan view<br />Hand and machine excavated trench<br />Ditch<br />Cross section view<br />c. 0.55m<br />Present soil<br />c. 0.15m<br />0.8-1.0m<br />Ditch fills<br />‘Geology’<br />Step 3. Machine excavate trench to 0.8-1.0m depth across its entire area.<br />
  4. 4. Strategyfor Harnhill<br />Plan view<br />Hand and machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />c. 0.15m<br />0.8-1.0m<br />‘Geology’<br />Monolith samples<br />Step 4. Draw and photograph both long sections. Collect geoarchaeological and geotechnical samples. Mark sample locations on section drawing and photograph in situ.<br />
  5. 5. Strategyfor Harnhill<br />Plan view<br />Hand and machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />c. 0.15m<br />0.8-1.0m<br />Data logger, batteries etc.<br />‘Geology’<br />Sensors<br />Step 5. Install monitoring equipment (on opposite long section from the monolith samples)<br />Step 6. Machine backfill trench and compact<br />
  6. 6. Strategyfor Harnhill<br />Preliminary schedule:<br />Day 1 (Monday 11 April): Survey in trenches and hand removal of present soil (ideally survey the trenches in the week before) – Step 1.<br />Day 2 (Tuesday 12 April): Complete removal of topsoil and hand excavation of ditch fills. Production of archaeological written records (context sheets etc) – Steps 1-2. Collect cores.<br />Day 3. (Wednesday 13 April – a long day!): Machine excavation of trenches, sections drawn and photographed, simultaneous collection of monolith samples and installation of probes/monitoring equipment, monolith and probe locations marked on section drawing and photographed, monolith samples extracted, trench machine backfilled – Steps 3-5.<br />Day 4. (Thursday 14 April – if required): Compact backfilled area, reinstate and fence off, check monitoring equipment – Step 5.<br />
  7. 7. Strategyfor Diddington<br />Plan view<br />Machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />c. 0.30m<br />‘Geology’<br />‘Geology’<br />Ditch fill<br />Step 1. Trench surveyed in and present soil removed by machine to the level of the underlying geology / top of the uppermost ditch fill. Artefacts are recovered.<br />
  8. 8. Strategyfor Diddington<br />Plan view<br />Cores inside ditch<br />Machine excavated trench<br />Cores outside ditch<br />Ditch<br />Hand excavate ditch fills<br />Cross section view<br />c. 1.00m<br />Present soil<br />c. 0.30m<br />‘Geology’<br />‘Geology’<br />Ditch fills<br />Step 2. Ditch fills are removed separately by hand until the ‘geology’ is reached. Artefacts recovered from each ditch fill are kept separate. Total station/GPS measurements are taken on the surface of the ‘geology’ to produce a surface model. Cores collected.<br />
  9. 9. Strategyfor Diddington<br />Plan view<br />Machine excavated trench<br />Ditch<br />Cross section view<br />c. 1.00m<br />Present soil<br />c. 0.30m<br />1.2m<br />Ditch fills<br />‘Geology’<br />Step 3. Machine excavate trench to 1.2m depth across its entire area.<br />
  10. 10. Strategyfor Diddington<br />Plan view<br />Hand and machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />1.2m<br />‘Geology’<br />Monolith samples<br />Step 4. Draw and photograph both long sections. Collect geoarchaeological and geotechnical samples. Mark sample locations on section drawing and photograph in situ.<br />
  11. 11. Strategyfor Diddington<br />Plan view<br />Machine excavated trench<br />Ditch<br />Cross section view<br />Present soil<br />1.2m<br />Data logger, batteries etc.<br />‘Geology’<br />Sensors<br />Step 5. Install monitoring equipment (on opposite long section from the monolith samples)<br />Step 6. Machine backfill trench and compact<br />
  12. 12. Strategyfor Diddington<br />Preliminary schedule:<br />Day 1 : Survey in trenches and machine removal of present soil under archaeological supervision. Hand excavation of ditch fills – Steps 1-2.<br />Day 2: Completion of excavation of ditch fills. Production of archaeological written records (context sheets etc) – Steps 1-2. Collect cores.<br />Day 3: Machine excavation of box section, sections drawn and photographed, simultaneous collection of monolith samples and installation of probes/monitoring equipment, monolith and probe locations marked on section drawing and photographed, monolith samples extracted, trench machine backfilled – Steps 3-5.<br />Day 4 (if required): Compact backfilled area, reinstate and fence off, check monitoring equipment – Step 5.<br />

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