Sewer System Schedule: The Cart Before The Horse
The following was sent to Longton's council members on 28Sep25.
I received the following September 24th, in response to a query I made to Lamp Rynearson regarding a source for quantitative soil moisture guidelines to implement smoke testing of the City's sewer system.
Thank you for reaching out and for the detailed background on your community's soils and groundwater conditions. You're asking a great question—smoke testing is most reliable when groundwater is at its lowest and soils are as dry as possible. If the soil is saturated or the lines are under groundwater pressure, the smoke can't escape through defects as intended, which may lead to false negatives.
Unfortunately, there aren't published "quantitative soil moisture guidelines" for smoke testing. Industry best practice is to schedule testing during the driest time of year—typically July and August in Kansas—when hot weather, low rainfall, and plant transpiration combine to reduce soil moisture and lower the water table. Ideally, there should be at least 30 days of relatively dry weather prior to testing.
For your community, I'd recommend:
- Avoiding winter months since groundwater tends to rise and vegetation isn't pulling moisture from the soil.
- Targeting late summer when conditions are hottest and driest, even if that means delaying the test to ensure accuracy.
- Discussing with your testing provider whether sections of line that remain in groundwater year-round are likely to produce reliable results, or if alternative inspection methods (like CCTV) may be better suited. (suited to the 'in groundwater' areas).
I hope this helps give you and your community some direction as you plan. While our team won't be directly involved in this project, we're glad to point you toward best practices so you can get meaningful results.
FYI, the Lamp Rynearson team has experience with smoke testing, manhole inspections, CCTV review and analysis, and construction administration for sewer rehab projects.
I hope the collective IQ of the Council realizes from this information that the Smoke Test, at this point, should be scheduled for the late summer of 2026. I doubt the Mayor has a clue, or cares at this point.
Until the Smoke Test can be reliably completed, there is no need for any additional pre-planning, design work, or sourcing funding at this time. The Smoke test is essential, augmented by CCTV footage (not replaced with it) to determine the scope of work needed. Once a Scope has been defined from, funding and initial planning should follow. To do otherwise is to put the cart before the horse, and waste taxpayers monies.
The following was sent to Longton's council members on 28Sep25.
I received the following September 24th, in response to a query I made to Lamp Rynearson regarding a source for quantitative soil moisture guidelines to implement smoke testing of the City's sewer system.
Thank you for reaching out and for the detailed background on your community's soils and groundwater conditions. You're asking a great question—smoke testing is most reliable when groundwater is at its lowest and soils are as dry as possible. If the soil is saturated or the lines are under groundwater pressure, the smoke can't escape through defects as intended, which may lead to false negatives.
Unfortunately, there aren't published "quantitative soil moisture guidelines" for smoke testing. Industry best practice is to schedule testing during the driest time of year—typically July and August in Kansas—when hot weather, low rainfall, and plant transpiration combine to reduce soil moisture and lower the water table. Ideally, there should be at least 30 days of relatively dry weather prior to testing.
For your community, I'd recommend:
- Avoiding winter months since groundwater tends to rise and vegetation isn't pulling moisture from the soil.
- Targeting late summer when conditions are hottest and driest, even if that means delaying the test to ensure accuracy.
- Discussing with your testing provider whether sections of line that remain in groundwater year-round are likely to produce reliable results, or if alternative inspection methods (like CCTV) may be better suited. (suited to the 'in groundwater' areas).
I hope this helps give you and your community some direction as you plan. While our team won't be directly involved in this project, we're glad to point you toward best practices so you can get meaningful results.
FYI, the Lamp Rynearson team has experience with smoke testing, manhole inspections, CCTV review and analysis, and construction administration for sewer rehab projects.
I hope the collective IQ of the Council realizes from this information that the Smoke Test, at this point, should be scheduled for the late summer of 2026. I doubt the Mayor has a clue, or cares at this point.
Until the Smoke Test can be reliably completed, there is no need for any additional pre-planning, design work, or sourcing funding at this time. The Smoke test is essential, augmented by CCTV footage (not replaced with it) to determine the scope of work needed. Once a Scope has been defined from, funding and initial planning should follow. To do otherwise is to put the cart before the horse, and waste taxpayers monies.