Grainsize Analysis of Soil Samples in Arroyo Alamar Six exploratory boreholes were dug along the alignment of Arroyo Alamar with the purpose of ascertaining the type and quality of the alluvial materials (sands and gravels). Each borehole was dug to 3 m depth, and three samples were taken from each hole, at every meter. Samples are labeled A (1 m), B (2 m), and C (3 m). Six selected soil samples were analyzed for grain size, and the results are reported herein.

Location of Boreholes

Grainsize Analysis (grayscale)

 

Sample	Classification	Description
1A	SW	well graded sand
1B	SW	well graded sand
1C	SW	well graded sand
2A	SP	poorly graded sand with gravel
2B	SP	poorly graded sand with gravel
2C	SP	poorly graded sand with gravel
3A	SP	poorly graded sand with gravel
3B	SP	poorly graded sand with gravel
3C	SW	well graded sand
4A	SP	poorly graded sand with gravel
4B	SP	poorly graded sand with gravel
4C	SP-SM	poorly graded sand with silt
5A	SW	well graded sand
5B	SP-SM	poorly graded sand with silt
5C	SP-SM	poorly graded sand with silt
6A	SW	well graded sand
6B	SW	well graded sand
6C	SW	well graded sand

 

Location of Boreholes

 

Results The grainsize analysis shows the predominance of poorly graded sands with gravel (SP), some well graded sands (SW), and a few sands with some silt content (SP-SM).

 

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