Laserfiche WebLink
<br />??. <br />c. Casting/Cover Condition - Circle the appropriate word which best describes the <br />condition of cover (lid) and casting (ring). Circle above or below grade and enter <br />the approximate/measured vertical distance the cover is above or below the <br />adjacent pavement. Often older manhole covers are in a depressed or sunken <br />paved area. If ponding or runoff would occur in this area, circle "yes" and a best <br />guess as to the approximate area that drains to this point; otherwise circle "no". <br />Note the number and size of any holes in the cover; include lift/pick holes. <br />10. Sketch - Draw any necessary piping, etc. to aid in the description of what is happening <br />inside the manhole. Use arrows to indicate direction of flow. Use the reverse side if <br />more space is needed. Do not use the sketch to draw holes in the cover. Flow direction <br />should be noted. <br />11. Manhole Structure: <br />a. Configuration - Circle the appropriate or describe other. This information is often <br />times needed by Design Engineers when planning other utilities in crowded areas. <br />b. Material Type - Circle appropriate or describe other. <br />c. Depth and Diameter - Depth of manhole from center of the invert to top of <br />casting (TOC). Diameter is the average or approximate diameter of the manhole. <br />d• I/I Source and Rate - By observation of sources, circle those that apply and best <br />describe the leakage rate. These sources may not be leaking at the tune of <br />inspection. Look for evidence of leakage such as stains, mineral deposits or <br />debris which has entered such as leaves, grit, etc. Dampness can be observed on <br />walls which indicates surrounding groundwater level, but should not be confused <br />with condensation. Circle "L", "M", or "H" for Light, Medium or Heavy Leaks. <br />A light leak would be 0.25 GPM or less; medium would be 0.50 - 0.75 GPM; <br />and heavy would be 1.0+ GPM. The assignment of leakage rates is difficult until <br />a"feel" is developed through exposure and experience. <br />e. Structure/Condition - This is to note the observed condition of the items listed or <br />any other structure you can comment on found within the manhole. Indicate the <br />number of missing/broken steps. <br />Items in this Manhole Structure Category may require more room to explain what is <br />observed. If so, use the Comments Box at the bottom of the page or the reverse side of <br />the form. <br />Use the Comments Box to describe things like signs of surcharge to feet above the <br />invert, inch gap between casting (ring) and riser, large cracks in manhole walls full <br />height, 8-inch hole in storm pipe passing through manhole, etc. <br />-2- <br />_ <br />?