DC WATER B STREET NEW JERSEY AVENUE TRUNK SEWER

摘要

The observations from the visual inspection, results of the non-destructive testing, and output from the structural modeling identified areas with multiple crown cracks and areas where the bond strength at the construction joint has been significantly reduced as the most critical defects that could potentially compromise the structural integrity of the sewer. Based on this prioritization, it is recommended that these areas be considered for immediate repair. Locations where the concrete at the construction joint was observed to have "turned to gravel" or where it was described as "too soft" are slightly more ambiguous because non-destructive testing results could not be obtained for these areas. However, visual observations identified deterioration of the concrete that could result in a reduction in bond strength at the construction joint. Because these areas do not display roots and water infiltration, and inspectors were not able to push the probing rod partially through the concrete, these areas are classified as less significant than the top priority side wall defects. The structural modeling did not identify areas with multiple defects as a critical condition. However, the presence of multiple deficiencies could indicate conditions, such as settlement, high groundwater elevations, or unbalanced external loads, which are causing higher stress levels in these sections of sewer. Therefore, these areas should be monitored and considered for repair after the top priority issues have been addressed. Other defects were observed during testing at varying levels of severity. However, these areas were not determined to be a priority for repair based on structural modeling. The visual observations and non-destructive testing results also did not identify these areas as critical. Although these areas are not identified as requiring repair at this time, it is recommended that they continue to be monitored and compared to the baseline conditions established by this inspection. If conditions are observed to change, they should be reprioritized as appropriate. Follow-up visual inspections are recommended at intervals of approximately every 5 years to monitor existing conditions.