Attachment 3 AMacy Onsite Evaluation.pdf

Onsite Evaluation Report – A. Macy – 9044 Palmer Way, Warm Springs, OR

Completed by Darcey Jones, IHS, Project Manager

Test Pit Evaluation – Conducted July, 2020:

Overview:

The IHS proposes to construct an equal distribution drainfield system and community water connection to the home. On July 09, 2020, suitable soil for an on-site individual septic system was found near the

West side of the property. Two out of Five test pits were limited at around 21-inches by bedrock and no signs of a seasonal water table were evident.

New Home Details:

4 BDRM – 2.5 BA w/ 3 occupants

Design Flow = 450 GPD (OAR 340-071-0220 Table 1)

Site Plan: Attached

Test Pit #1- Not suitable for drainfield

0”-22” Soil Group B – Sandy Loam

22”-43” Soil Group A – Loamy Sand

43”-62” Soil Group B – Sandy Loam

Limiting Layer was found at 21”

Allowable Trench Depth – 21”

Effective Soil Depth – 18” min. 21 max.

Test Pit #2- Not suitable for drainfield

0”-22” Soil Group B - Clay Loam

22”-39” Soil Group B – Sandy Loam

39”-69” Soil Group B – Sandy Loam

Limiting Layer was found at 42”

Allowable Trench Depth- 18”min 36”max

Effective Soil Depth – 24”-36” Bedrock Limited

Test Pit #3

0-39” Soil Group C – Clay 39”-72” Soil Group B – Clay Loam No limiting layer was present Effective Soil Depth – 24”-36”

Test Pit #4

0-48” Soil Group C - Clay 48”-72” Soil Group B – Sandy Clay Loam No limiting layer was present Effective Soil Depth – 48” or more

Test Pit #5 – Suitable Soil Approval Area

0”-44” Soil Group B – Loam 44”-70” Soil Group B – Loam No limiting layer was present Allowable Trench Depth- 18”min 36”max Effective Soil Depth – 48” or more

STDF Site Approval NEAR TEST PIT #5:

Home Size: 4BDRM/2.5 BA

Design Flow = 450 gpd

Required Septic Tank Volume = 1,500 gallons

Allowable Trench Depth: 18”min 36”max

Effective Soil Depth: 48” or more

Soil Group B – Loam

Required Minimum Drainfield Length = 375LF

Narrative Approval: Construct an equal distribution conventional drainfield (375LF) in accordance with

Oregon Administrative Rules On-site Wastewater Individual Septic System.

Site Photos:

Figure 1Test Pit #5 (Approved drainfield area)