Sewer pipe moves waste by gravity alone, and a quarter inch of error in the fall matters. A sanitary line laid a little flat holds water and fails inspection, and a line laid a little steep can scour its own joints. For that reason the sewer is the first utility to be set out on most commercial sites, and every other line is fitted around it.
Hotels, hospitals, office buildings and apartment projects in Midland all depend on a clean connection to the public system. The connection point, its depth and the allowed flow are fixed by the city and the engineer, and the building pad sits above it. We coordinate trade partners to excavate, bed, lay and test the pipe, and concrete trade partners place the concrete that supports it.
We build the sewer sequence into the owner's pour calendar, so the slab is never waiting on a pipe that has not passed its test, and the pipe is never buried before the inspector has seen it. If a line has to wait for a utility owner's approval, the calendar shows who holds it and what depends on it, so the owner can press the right door at the right time.
Concrete we place and trades we coordinate
Concrete trade partners place manhole bases, concrete encasement where cover is shallow or a line crosses another, collars at structure connections and the slabs and paving that close the trench. We also build cleanout pads and drive-lane reinforcement where a line crosses a truck route.
Excavation, shoring, pipe laying, bedding, backfill and testing are done by trade partners whom we coordinate. We do not describe ourselves as the sewer installer. We act as the party that knows when the concrete scope falls, and we make sure the line is ready for it.
Buildings that depend on a clean connection
A hotel generates steady flow from many fixtures and often carries a grease interceptor where there is a kitchen. A hospital needs reliability above all, with isolated lines for some uses. Mixed-use and apartment projects require stacked service connections that must align with the pad.
Retail and office buildings are simpler but still depend on a correctly placed cleanout and a grade that reaches the street. We ask for the plumbing plans and the civil sheets together so that stub-outs under the slab match the line serving them.
Grade, bedding and structure before backfill
We start with the invert elevations at the connection and the building. If the numbers do not leave enough fall, we raise the question with the engineer before the trench is open. Laser or transit control is set up at the beginning, and the line is checked at each section.
Bedding is placed to the thickness in the details, haunched around the pipe and compacted in lifts. Manhole bases are set level, and joints are sealed and checked. We insist that the inspector see the pipe and the bedding before backfill, since no one wants to dig it up again. Photos from each stage go into the project file.
Owners and the questions they ask
Commercial developers ask whether the pad can receive service by a certain date and whether the connection will require work in the street. General contractors and construction managers ask how the sewer fits in the sitework sequence and who owns the test results.
Our answers come from the calendar. We name the dates for excavation, inspection, testing and backfill, and we state what could move them. When a street cut is needed, we flag the permit and the traffic control plan early, since right-of-way approvals often take longer than the pipe work.
Fitting the sewer into the overall schedule
Sewer work comes early because it is deep and because other work waits on it. We aim to have the line installed, tested and backfilled before the building pad is prepared, so the compaction effort is not disturbed by later digging. If the line has to follow the foundation work, we plan access for equipment and protect finished footings.
Material deliveries are scheduled to match crew availability, and the schedule includes time for the video inspection or air test that many cities require. Weather rarely stops sewer work in this climate, but heat limits working hours in summer and wind can delay concrete finishing at structures. We note both in the calendar.
Downtown and beyond
Downtown Midland is seeing public and private investment. In January 2024 the City Council approved city and Midland Development Corporation participation in the Hotel Santa Rita project, which brings $125 million in private funds, a hotel of at least 135 rooms and an 800-space parking garage. The city also lists Centennial Park, the Bush Convention Center, the Omni Midland Hotel and the Locklin Trapestry Hotel among its public-private downtown projects. Sewer work in a dense district like that takes careful routing, and our downtown Midland page explains how we approach it.
Away from downtown, we mobilize crews to pads along Loop 250 and on the edges of the city, where lines may be long and manholes few. Those jobs bring a different set of challenges, mainly depth, rock and distance to the connection.
Specifications and sign-offs
The city sets minimum slopes, manhole spacing, pipe materials and testing methods in its standards. The engineer's drawings add project requirements. A private sewer inside a lot answers to the adopted plumbing code and the local permit office. We confirm which set of rules applies to each section before the first trench is cut.
Required sign-offs typically include bedding, pipe in place before backfill, a pressure or low-pressure air test and a final inspection. The permit office or the city inspector schedules these, and we request each visit in time to stay on the calendar. Records are filed with the owner's project closeout package. See also our storm drain and manhole and vault pages for related requirements.
Put the sewer in the calendar
Send us the civil sheets and the plumbing plans. We will set out the sewer, tests and concrete in a written sequence the whole project team can follow.
Common Questions
Who sets the sewer depth and slope?
The civil engineer sets them on the plans, based on the connection point and the city's standards. We check the numbers against site conditions before work starts. If the fall is tight, we raise it right away so the engineer can adjust.
Can sewer installation begin before the building permit is issued?
That depends on the project and the city. Public line work may need its own approval, and private lines on a site often wait for the site permit. We ask the permit office what is needed and plan accordingly.
What tests will the sewer need?
Common tests are an air or low-pressure test, a mandrel check for deflection and a video inspection. The city or the engineer decides which are required. We schedule them after backfill compaction and before paving.
How do you prevent settlement in the trench?
We place backfill in thin lifts, compact each to the density the specification names and have the testing technician confirm it. We watch most closely where the trench passes under a planned slab or drive lane, since settlement there shows up later as cracking.
What if the connection point has to be moved?
We coordinate with the engineer and the city, since a moved connection can change depth and slope. A drawing revision and a new approval may be required. We show the effect on the schedule right away.