For in-floor sparger pipes , this requires access at both ends of every straight run. For in-floor weed & feed trenches, the trench covers themselves must be removable. Fasteners for trench covers should be stainless steel with nongalling threads so that they can be serviced over the lifetime of the facility. An example of a trench with the covers removed for annual cleaning is shown in Figure 3. With Atkins you get more than four decades of experience in grounds maintenance.