Homework -Ostds

HOMEWORK/PRACTICE Instructions: Indicate if an excavation is an option. If ‘yes’ determine the elevation of the bottom of the drainfield in reference to grade if an excavation is performed. Also indicate the elevation of the bottom of the drainfield in reference to grade if an excavation is not performed.

1) 10YR 4/1 FS 0-5” 10YR 7/1 FS 5-18” 10YR 5/6 CMN/PROM/RF 10-18” 10YR 2/1 SPODIC 18-20” 7.5YR 3/2 SPODIC 20-25” 10YR 2/1 SPODIC 25-30” 7.5YR 4/4 FS 30-37 10YR 6/2 FS 37-41” 10YR 7/3 SCL 41-60” 10YR 6/2 LS 60-72” WSWT 10”

2) 10YR 2/1 FS 0-4” 10YR 6/1 FS 4-20” 10YR 7/1 STRIPPING 10-18” 10YR 7/1 FS 20-25” N 6/0 SCL 25-39” 5Y 6/1 SL 39-72” WSWT 10”

3) 10YR 2/1 MUCK 0-11” 10YR 6/2 FS 11-17” REFUSAL @ 17” Hole caving in due to water WSWT 0”

 

 

 

4) 10YR 2/1 FS 0-2” 10YR 7/3 FS 2-15” 10YR 7/1 STRIPPING 10-15” 10YR 3/2 SPODIC 15-17” 7.5YR 3/2 SPODIC 17-25” 10YR 6/4 FS 25-29” 10YR 2/1 SPODIC 29-33” 7.5YR 3/2 SPODIC 33-42” REFUSAL @ 42” Hole caving in due to water WSWT 10”

5) 10YR 2/1 FSL 0-5” 10YR 4/1 FSL 5-12” 10YR 4/1 SCL 12-38” 10YR 5/2 SCL 38-56” 10YR 7/1 FS 56-72” Notes: 10YR 7/1 CMN/DIST RF starting at 12” WSWT 12”

Instructions: Below are readings using the laser transit. Determine the elevation, in inches, of the proposed system site in reference to the benchmark. Indicate if the proposed system site is above or below the benchmark.

1) Benchmark 1’3” Proposed System Site 3’3”

 

2) Benchmark 4’2” Proposed System Site 2’9”

3) Benchmark 0’6” Proposed System Site 1’10”

4) Benchmark 2’2” Proposed System Site 2’6”

 

 

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