Do not hesitate to reach out to a design consultant with T & J Panels to help answer any questions you may have regarding the use of panel block systems.  We help with LPP system design, manifold design, on-site consultations, and any other service that might be needed in the field.  Please contact Our Staff with any questions pertaining to design or use of a T&J Panel System.

Please contact T&J Panels with any questions regarding foam sealer.

Approved Backfill

This inspection checklist is included in the T & J Panel Design, Installation, and Maintenance Manual ​ for further reference.

​1) Is the depth of the panels within guidelines?​
​2) Are drain lines level or within less than 1/4 inch fall per 10ft?
​3) Have seals been properly constructed?
​4) Was the proper sand used in the trench backfill?
Is the sand clean? (i.e. free of debris, large organics, leaves, etc.)
Has the sand been screened? (to a medium-grade, not too fine, free of large rocks)
Is the sand naturally-occurring? (i.e. from a river, creek, sand pit, etc., not manufactured)

​5) If in soils where clay is present, were the sidewalls raked and limed?
​​6) Were panels installed horizontally or vertically, according to the permit?
For Pumped Systems:
​7) Have pump size, head pressure and dose cycle been properly sized and set?
​8) Record field data on operations permit.

Design & Inspection


Design Consultation

Inspection Checklist

Please utilize these design and inspection resources while designing and inspecting the T & J Panel Wastewater Treatment System.  If you have any site specific questions, please do not hesitate to contact our offices at (704) 924-8600 to speak with a consultant.

Backfill sand shall be a clean, screened, medium-grade sand that is naturally-occurring.  Acceptable sands are sands that are suitable for the production of ready-mix concrete and clean of organic debris and stone.  Sands dredged from rivers and creeks can be used, if gradation is sufficient to be blended into ready-mix concrete production.  Product description includes, but is not limited to: Concrete Sand, NC-2S Sand, ASTM C-33 Sand, FA-10 Sand and Grade “A” Sand.  Product suitability is important and T&J Panel, Inc. will help answer any questions.  Click here for a county by county list of potential sources of backfill sand.  Be sure to check with these sources to ensure they supply the correct type of sand.