Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
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5.2.2 Timel<strong>in</strong>e for Fieldwork<br />
Tuesday, April 13, 2010<br />
7:30 AM Contractor’s (Bale) crew began stag<strong>in</strong>g equipment and prepar<strong>in</strong>g the site for the<br />
excavation.<br />
8:00 AM Excavation began on asphalt roadway. The asphalt layer was approximately 4 <strong>in</strong>. thick<br />
with 4 <strong>in</strong>. <strong>of</strong> road base material compacted beneath. The excavation was carried out<br />
between manholes 0233S0013 and 0233S0010, from 254 ft to 264 ft west <strong>of</strong> manhole<br />
0233S0013.<br />
8:05 AM After removal <strong>of</strong> the asphalt pavement, a soil sample was taken at the sub-grade level.<br />
Sample No. 1 was collected and placed <strong>in</strong> a 1 gallon plastic bag. All samples were<br />
collected with a spade shovel and hand loaded <strong>in</strong>to sample conta<strong>in</strong>ers.<br />
8:30 AM Excavation was halted and sample No. 2 was collected from the bottom <strong>of</strong> the trench at a<br />
depth <strong>of</strong> 3 ft.<br />
9:45 AM In-service, 4 <strong>in</strong>. diameter, vitrified clay lateral was encountered. The lateral entered the<br />
ma<strong>in</strong> l<strong>in</strong>e from the south with a 90° bend. At the connection, concrete was poured to assist<br />
<strong>in</strong> keep<strong>in</strong>g the lateral <strong>in</strong> place at the ma<strong>in</strong> l<strong>in</strong>e. No noticeable leak<strong>in</strong>g was detected <strong>in</strong> this<br />
area. There was also a second, <strong>in</strong>active lateral on the north side <strong>of</strong> the excavation.<br />
10:00 AM Excavation encountered crown <strong>of</strong> pipe. Excavation was halted and sample No. 3 was<br />
collected from 6 ft below grade and immediately above the crown <strong>of</strong> the pipe. Sample No.<br />
4 was collected from the side <strong>of</strong> the trench at elevation 5 ft below grade.<br />
10:05 AM Excavation activity entered the area surround<strong>in</strong>g and below the pipe. Formation l consisted<br />
predom<strong>in</strong>antly <strong>of</strong> native shale. Visual observation suggested good compaction around the<br />
pipel<strong>in</strong>e. The bedd<strong>in</strong>g material was undisturbed with a solid beam support and good<br />
support at the spr<strong>in</strong>g l<strong>in</strong>es. Normal condensation was observed around the outside <strong>of</strong> the<br />
clay host pipe. The clay host pipe was <strong>in</strong>stalled with 2 ft jo<strong>in</strong>ts.<br />
10:55 AM Sample No. 5 was collected with cont<strong>in</strong>ued hand digg<strong>in</strong>g at the spr<strong>in</strong>g l<strong>in</strong>e level <strong>of</strong> the<br />
pipe.<br />
11:10 AM Sample No. 6 was collected with cont<strong>in</strong>ued hand digg<strong>in</strong>g at the <strong>in</strong>vert <strong>of</strong> the pipe.<br />
Bedd<strong>in</strong>g beneath the <strong>in</strong>vert consisted ma<strong>in</strong>ly <strong>of</strong> native shale. Traces <strong>of</strong> excess res<strong>in</strong> from<br />
the <strong>in</strong>stallation were observed and a res<strong>in</strong> sample collected for future consideration.<br />
11:30 AM Once the l<strong>in</strong>e was 90% exposed, shims and brac<strong>in</strong>g were used to support the host pipe.<br />
The pipe was lashed to a wooden support structure and layers <strong>of</strong> the shr<strong>in</strong>k wrap material<br />
were applied. Two lift<strong>in</strong>g sl<strong>in</strong>gs were then fitted to the pipe specimen and the excavator. It<br />
should be noted that the host pipe with CIPP was not fully supported several times dur<strong>in</strong>g<br />
the excavation and removal process, act<strong>in</strong>g as a simple supported beam. One section <strong>of</strong><br />
lateral was damaged dur<strong>in</strong>g excavation and was removed so that the excavation around the<br />
pipe could be completed.<br />
14:00 AM One wastewater sample (Richards-8) was collected for pH and total petroleum<br />
hydrocarbons (TPH) <strong>in</strong>clud<strong>in</strong>g gasol<strong>in</strong>e range organics (GRO) and diesel range organics<br />
(DRO).<br />
14:05 PM Another wastewater sample (Richards-8D) was collected for pH and TPH GRO/DRO.<br />
14:15 PM The shor<strong>in</strong>g box was set and a temporary l<strong>in</strong>e was put <strong>in</strong> place for the lateral that was<br />
removed. Steel plates were placed over the excavation and cold patch around the edges.<br />
15:15 PM Measurements <strong>of</strong> the annular gap between the host pipe and l<strong>in</strong>er were taken us<strong>in</strong>g a feeler<br />
gauge at both ends <strong>of</strong> the specimen and at both ends <strong>of</strong> the rema<strong>in</strong><strong>in</strong>g pipe before the repair<br />
is made.<br />
15:30 PM The construction crew f<strong>in</strong>ished wrapp<strong>in</strong>g the specimen and loaded the specimen <strong>in</strong>to the<br />
bed <strong>of</strong> a truck.<br />
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