OAR 340-071-0325
Gray Water Waste Disposal Sumps
(1)
Criteria for approval.(a)
Hand-carried graywater may be disposed of in graywater waste disposal sumps that serve facilities, including but not limited to recreation parks, camp sites, or construction sites, if the projected daily graywater flow does not exceed 10 gallons per unit. Graywater or other sewage may not be piped to the graywater waste disposal sump. Where projected daily sewage flow exceeds 10 gallons per unit, graywater must be disposed of in facilities meeting requirements of OAR 340-071-0320 (Split Waste Method)(2).(b)
Graywater sumps may be used where the agent determines they will not create a nuisance or public health hazard.(c)
Up to four graywater waste disposal sumps may be constructed on the same property and at the same time for each construction permit. The sumps must meet minimum separation distances in Table 8.(2)
In campgrounds or other public use areas, graywater waste disposal sumps must be identified as “sink waste disposal” by placard or sign in letters at least 3 inches in height and in a color contrasting with the background.(3)
Design and construction details for the graywater waste disposal sumps must be submitted with the permit application. At a minimum, the sump design concepts must include a receiving chamber with screen, settling chamber with tee fitting that extends about a third of the depth of the clear zone, and an absorption facility. The absorption facility may be a shallow seepage chamber or absorption trench, depending on site conditions or other considerations.
Source:
Rule 340-071-0325 — Gray Water Waste Disposal Sumps, https://secure.sos.state.or.us/oard/view.action?ruleNumber=340-071-0325.