Stormwater Treatment 1604 San Leandro Boulevard 042122

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• Observe, quantify and record the accumulation of oils in the inlet chamber. The significance of accumulated floating oils is a matter of judgment. However, if there is evidence of an oil or fuel spill, immediate maintenance by appropriate certified personnel is warranted. • Observe, quantify and record the average accumulation of sediment in the inlet chamber and treatment chamber. A calibrated dipstick, tape measure, or sludge sampler may be used to determine the amount of accumulated sediment in each chamber. The depth of sediment may be determined by calculating the difference between the measurement from the rim of the PerkFilter to the top of the accumulated sediment, and the measurement from the rim of the PerkFilter to the bottom of the PerkFilter structure. Finding the top of the accumulated sediment below standing water takes some practice and a light touch, but increased resistance as the measuring device is lowered toward the bottom of the unit indicates the top of the accumulated sediment. • Finally, observe, quantify and record the amount of standing water in the treatment chamber around the cartridges. If standing water is present, do not include the depth of sediment that may have settled out below the standing water in the measurement. Maintenance Triggers Maintenance should be scheduled if any of the following conditions are identified during the inspection: • Internal components are broken or missing. • Inlet piping is obstructed. • The accumulation of floating trash and debris that cannot be retrieved with a net and/or oil in the inlet chamber is significant. • There is more than 6" of accumulated sediment in the inlet chamber. • There is more than 4" of accumulated sediment in the treatment chamber. • There is more than 4" of standing water in the treatment chamber more than 24 hours after end of rain event. • A hazardous material release (e.g. automotive fluids) is observed or reported. • The system has not been maintained for 3 years (wet climates) to 5 years (dry climates). Maintenance Equipment The following equipment is helpful when conducting PerkFilter maintenance: • Suitable clothing (appropriate footwear, gloves, hardhat, safety glasses, etc.) • Traffic control equipment (cones, barricades, signage, flagging, etc.) • Socket and wrench for bolt -down access covers • Manhole hook or pry bar • Confined space entry equipment, if needed • Flashlight • Tape measure • 9/16" socket and wrench to remove hold-down struts and filter cartridge tops • Replacement filter cartridges • Vacuum truck with water supply and water jet Contact Oldcastle Infrastructure at (800) 579-8819 for replacement filter cartridges. A lead time of four weeks is recommended.