Sample Monitoring Plan for a Sand Filter

 

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Permit # __________________

System Owner: ____________________

Address: ________________________________

Maintainer: __________________________________________

Brief System Description: Septic Tank with lift tank with sand filter with shallow trenches in loam

soil, sized at 1.67 with 1.5 feet of vertical separation distance.

Brief Operation Description: The wastewater flows from a two bedroom cabin with

and an estimated flow rate of 300 gallons per day into a 1000 -gallon septic tank

followed by a 1000 gallon lift station. It is then time dosed into an Orenco sand filter. From

there the sand filter effluent is pressure dosed into a shallow drainfield using a chamber

technology for distribution.

 

List the components to be monitored below:
Component Service Needed Service Compliance Level Monitoring and Frequency Monitoring Compliance Level
Flow none none Annually Less than 300 gpd
Septic Tank Pump when out of compliance Complete Removal Sludge Depth Scum Depth, Annually <12" from baffle, < 3" from baffle
Timers and pumps Run pump drawn down test Pump is operating at designed GPM Annually Timers set and within 10% of design GPM
Lift Tank Pump when pumping septic tank Complete Removal Annually none
Sand Filter Pressure Distribution Flush lines when squirt heights vary Squirt height changes by .5 feet or more Annually Change in squirt height does not change more than .5 feet
Sand Filter Determine what is causing ponding Eliminate Ponding Annually No ponding in filter
Sand Filter Determine what is causing poor performance Reduce BOD/TSS/FECAL Annually BOD < 20 mg/, TSS < 20 mg/L Fecal Coliform < 10,000 colonies per 100 ml
Pressure Distribution System in Trenches Flush lines Squirt height changes by .5 feet or more Annually Squirt height changes by .5 feet or more

 

 

Sample Mitigation Plan for Sand Filter

Permit # ______________________

Please list each component, possible failures, and responses:

Component

Possible Failure

Response

Flow

Too much flow

Look for leaky fixtures and leaky tanks, repair

Septic Tank

Excessive solids buildup

Check for garbage disposal

Timers and pumps

Failure or too low flow rates

Replace

Sand Filter

Ponding

Replace upper layer

Sand Filter

Does not meet lab tests

Check application rates, inflow waste levels, plugging in filter

Pressure Distribution Systems Plugging or surfacing Flush lines