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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
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      <title>Salt Creek Interceptor Gravity Sewer Interceptor</title>
      <link>https://trid.trb.org/View/759485</link>
      <description><![CDATA[The Salt Creek Sewer Basin encompasses a significant portion of the developed and developing eastern part of the City of Chula Vista, California.  Portions of the Otay River Valley, as well as portions of the unincorporated area north and east of Otay Lakes Road are tributary to the Salt Creek Sewer Basin.  Furthermore, the Salt Creek Sewer Basin also encompasses a smaller sewer shed known as the Wolf Canyon Sewer Basin.  Chula Vista needed to provide sewerage facilities and service to these large tracts of land.  This resulted in a series of studies that explored a variety of available options.  Option 1 included a water reclamation plant.  However, this option was not considered feasible.  Option 2 included a gravity sewer line.  Chula Vista explored the feasibility of constructing a gravity sewer line to convey the flows generated within the basin to the west side of the city.  An alignment study was performed, which was ultimately adopted and formed the basis of the design for the Salt Creek Gravity Sewer Interceptor.  This report contains information on the project background, environmental challenges, and engineering solutions.]]></description>
      <pubDate>Tue, 23 Aug 2005 15:39:29 GMT</pubDate>
      <guid>https://trid.trb.org/View/759485</guid>
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      <title>Trenchless Trunk Sewer Rehabilitation without Bypass Pumping or Utility Relocation</title>
      <link>https://trid.trb.org/View/759549</link>
      <description><![CDATA[The Novato Sanitary District is rehabilitating their 27-in. and 36-in. diameter Main Interceptor Sewer using trenchless rehabilitation methods that do not require bypass pumping.  A portion of the project was completed as a pilot project, using a machine spiral wound polyvinyl chloride (PVC) liner that was installed through existing manholes without any excavation, bypass pumping, or significant impacts to residents.  This paper summarizes the evaluation of various alternatives for rehabilitation, design considerations, options for bidding, and present photographs of the rehabilitation construction.  Specific issues to be addressed during the project include limited site access, crossing an existing railroad track that constrains bypass pumping, construction through easements across a nicely landscaped residential property, coordination with the City of Novato's pavement project, and utility relocation requirements for some of the rehabilitation methods.]]></description>
      <pubDate>Tue, 23 Aug 2005 15:39:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/759549</guid>
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      <title>A Guideline Checklist for Assessment of Dewatering Issues Along Large Interceptor Alignments</title>
      <link>https://trid.trb.org/View/759100</link>
      <description><![CDATA[Interceptor sewer pipelines can be large in diameter or involve multiple lines such that construction excavations are deep and wide in open cut reaches.  In environments near rivers and shorelines, such excavations and pipeline installations must be made below shallow groundwater levels and therefore require dewatering.  Dewatering large excavations over long alignments requires careful assessment of many dewatering-related issues.  This paper presents a checklist for design planning and evaluation on projects involving significant dewatering within both city and rural environments.  The checklist was used as guidance for multiple design teams involved in the segmental design of the Lower Northwest Interceptor (LNWI) Program to be constructed in western Sacramento County and eastern Yolo County, California.  The total length of the LNWI Program pipeline is approximately 31 km (19 mi).  Issues of potential concern are presented for this interceptor pipeline in relation to preliminary soil and groundwater conditions, physical features and improvements along the alignment, as well as for known environmental and regulatory issues.  Alternative dewatering and construction methods are summarized to establish a common baseline of options to consider during planning and site evaluations.  Finally, a plan of follow-on activities for the program manager and owner, to be concurrently undertaken during design development and review, is recommended for maintaining the Program's schedule and permitting needs.]]></description>
      <pubDate>Tue, 23 Aug 2005 15:39:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/759100</guid>
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      <title>Prediction of Seismically-Induced Settlement along the LNWI (Southport) Pipeline</title>
      <link>https://trid.trb.org/View/759534</link>
      <description><![CDATA[Interceptor sewers, with diameters generally greater than 1.5 m (5 ft), traverse long distances from their terminating sewage treatment plants as well as cross varied geologic materials and numerous physical features.  Routing of portions of pipelines often positions their alignments in lowland, flood plains which typically contain unconsolidated alluvial deposits, and adjacent to watercourses to minimize impacts on existing improvements.  Invert grades can be deep when compared to other utility grades and at times pipelines must be located within local groundwater aquifers.  Pipeline design in seismically active areas requires that combinations of potential earthquake shaking, high groundwater levels and granular foundation soils be evaluated for the potential of pipeline settlement or buoyancy.  This paper presents the conditions and methodologies used for such predictions for portions of the Lower Northwest Interceptor (LNWI) project to be constructed in Yolo County, California.  The total length of the LNWI project is approximately 31 km (19 mi).  A Standard Penetration and Cone Penetration Test subsurface program involving exploration spacings of 152.5 to 305 m (500 to 1000 ft) along the planned pipeline permitted the gathering of much subsurface soil and groundwater information as well as soil samples for characterization of material types, grain size characteristics, and fines contents.  A summary of alignment subsurface conditions is presented for the portions of the LNWI alignment and methods used for determination of potential levels of earthquake shaking, liquefaction potential, and estimates of settlement are evaluated.]]></description>
      <pubDate>Tue, 23 Aug 2005 15:39:27 GMT</pubDate>
      <guid>https://trid.trb.org/View/759534</guid>
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      <title>EVALUATION, REHABILITATION, AND REPLACEMENT OF THE 50-YEAR-OLD UPPER JONES FALLS INTERCEPTOR</title>
      <link>https://trid.trb.org/View/682436</link>
      <description><![CDATA[The Upper Jones Falls Interceptor, a 50-year old major interceptor sewer in the City of Baltimore, Maryland has had a long history of problematic sanitary sewer overflows attributed to inadequate capacity and excess inflow and infiltration.  The paper reviews the methodology employed to investigate the condition of the existing sewer and to prepare a design to rehabilitate the sewer to comply with US EPA requirements to eliminate overflows that regularly occur in the interceptor. The implementation of rehabilitation improvements must be completed by June 30, 2006.]]></description>
      <pubDate>Tue, 25 Nov 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/682436</guid>
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