field methods for probe installation 300311
DESCRIPTION
Presentation from Keith Wilkinson about the equipment installation strategy. Will be supplemented by Nicole Metje on the dayTRANSCRIPT
Hand excavated trench
Ditch
Plan view
Cross section view
Strategy for Harnhill
Present soil
‘Geology’ ‘Geology’Ditch fill
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.
c. 0.15m
Hand excavated trench
Ditch
Plan view
Cross section view
Strategy for Harnhill
Present soil
‘Geology’ ‘Geology’
Ditch fills
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.
Hand excavate ditch fills
Cores outside ditch (not Cherry Copse)
Cores inside ditch
c. 0.55mc. 0.15m
Hand and machine excavated trench
Ditch
Plan view
Cross section view
Strategy for Harnhill
Present soil
‘Geology’ Ditch fills
Step 3. Machine excavate trench to 0.8-1.0m depth across its entire area.
0.8-1.0m
c. 0.15mc. 0.55m
Hand and machine excavated trench
Ditch
Plan view
Cross section view
Strategy for Harnhill
Present soil
‘Geology’
Step 4. Draw and photograph both long sections. Collect geoarchaeological and geotechnical samples. Mark sample locations on section drawing and photograph in situ.
0.8-1.0m
Monolith samples
c. 0.15m
Hand and machine excavated trench
Ditch
Plan view
Cross section view
Strategy for Harnhill
Present soil
‘Geology’
Step 5. Install monitoring equipment (on opposite long section from the monolith samples)Step 6. Machine backfill trench and compact
0.8-1.0mData logger, batteries etc. Sensors
c. 0.15m
Preliminary schedule:Strategy for Harnhill
Day 1 (Monday 11 April): Survey in trenches and hand removal of present soil (ideally survey the trenches in the week before) – Step 1.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.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.Day 4. (Thursday 14 April – if required): Compact backfilled area, reinstate and fence off, check monitoring equipment – Step 5.
Machine excavated trench
Ditch
Plan view
Cross section view
Strategy for Diddington
Present soil
‘Geology’ ‘Geology’Ditch fill
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.
c. 0.30m
Machine excavated trench
Ditch
Plan view
Cross section view
Present soil
‘Geology’ ‘Geology’
Ditch fills
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.
Hand excavate ditch fills
Cores outside ditch
Cores inside ditchStrategy for Diddington
c. 1.00mc. 0.30m
Machine excavated trench
Ditch
Plan view
Cross section view
Present soil
‘Geology’ Ditch fills
Step 3. Machine excavate trench to 1.2m depth across its entire area.
1.2m
Strategy for Diddington
c. 0.30mc. 1.00m
Hand and machine excavated trench
Ditch
Plan view
Cross section view
Present soil
‘Geology’
Step 4. Draw and photograph both long sections. Collect geoarchaeological and geotechnical samples. Mark sample locations on section drawing and photograph in situ.
1.2m
Monolith samples
Strategy for Diddington
Machine excavated trench
Ditch
Plan view
Cross section view
Present soil
‘Geology’
Step 5. Install monitoring equipment (on opposite long section from the monolith samples)Step 6. Machine backfill trench and compact
1.2mData logger, batteries etc. Sensors
Strategy for Diddington
Preliminary schedule:
Day 1 : Survey in trenches and machine removal of present soil under archaeological supervision. Hand excavation of ditch fills – Steps 1-2.Day 2: Completion of excavation of ditch fills. Production of archaeological written records (context sheets etc) – Steps 1-2. Collect cores.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.Day 4 (if required): Compact backfilled area, reinstate and fence off, check monitoring equipment – Step 5.
Strategy for Diddington