An excavation contract is a bet about ground nobody has seen all of. The borings sampled a fraction of a percent of the site, the plan surface is a model, and the quantities are arithmetic performed on that model. Everything in the paper that matters is a decision about who pays when the ground turns out to be something else.
There are nine places where an earthwork contract either allocates that risk on purpose or leaves it floating, and a contract that leaves it floating has not saved anyone anything. It has only postponed the argument to the week it is most expensive to have. The clauses below are drawn from the two clause sets anybody can read: the federal construction clauses, and the state's own general conditions and earthwork items.
1. Which document wins
An earthwork scope is described in at least four places: the civil plans, the project specification, the geotechnical report and the bid form. They will not agree. The federal clause settles it in one line, that in case of difference between drawings and specifications, the specifications shall govern2, and it requires that a discrepancy in the figures, the drawings or the specifications be submitted promptly for a written determination2. Anything appearing in the specifications but not on the drawings, or the reverse, carries the same weight as if it were in both2, and a contractor who resolves a conflict on its own without that written determination does so at its own risk and expense2.
A private contract should say the same thing in its own words, and should add the geotechnical report to the stack with a position in the order. Left out, the report becomes whatever each party finds convenient: the standard the fill is tested against when a test fails, and mere information when its recommendations are inconvenient.
2. Differing site conditions
This is the clause the whole contract turns on, and the federal pair is instructive because the two halves pull against each other. The differing site conditions clause requires the contractor to give written notice promptly, and before the conditions are disturbed, of subsurface or latent physical conditions at the site that differ materially from those indicated in the contract, or of unknown physical conditions of an unusual nature that differ materially from those ordinarily encountered3. If the conditions do materially differ and they increase cost or time, an equitable adjustment is made and the contract is modified in writing3. No adjustment is allowed without that written notice, and none can be requested after final payment3.
The companion clause pushes the other way. The contractor acknowledges it has satisfied itself as to the character, quality and quantity of surface and subsurface materials or obstacles to be encountered insofar as this information is reasonably ascertainable, and as to the conformation and conditions of the ground and the uncertainties of weather4. The government assumes no responsibility for any conclusions or interpretations the contractor makes from the information it was given4.
Read together, those two clauses draw the line where it belongs: the owner carries what the documents got materially wrong, and the contractor carries its own reading of documents that were right. A private contract with the second half and not the first has moved the entire subsurface risk onto the bidder, which does not make the risk go away. It gets priced, contingently, by every bidder who notices, and absorbed as a claim by the one who did not.
The operative words are "before the conditions are disturbed". A changed condition that has already been excavated, hauled and buried cannot be inspected by anybody. We stop and report at the face, with photographs and an elevation, because that is the only moment the question can still be answered by looking.
3. Rock, and whether the contract classifies it
The state's excavation item is unclassified on purpose. It describes the work as removing the materials encountered to the lines, grades and typical sections shown on the plans and cross sections1, and it never sorts what comes out by hardness. One price covers whatever is there. Where the excavation runs below plan grade in a rock cut, approved embankment material is used to replace the undercut at no additional cost1.
That is a complete allocation, and it is a defensible one when the borings are good and the bidder has read them. It becomes a trap when the contract borrows the unclassified language but the report did not reach the depth the work does, or ran its borings where the building sits rather than where the deep cut is. The contract has two honest choices: classify, and carry a separate pay item and a definition of rock that a person in the field can apply, or stay unclassified and accept that the bid contains a contingency for the worst plausible reading of the borings. Silence picks the second one without admitting it.
4. Unsuitable material
Every clay site has some. The state item directs that unsuitable material encountered at or below subgrade be corrected as directed1, and its payment article separates the cases: excavation and replacement of unsuitable material below the grade shown on the plans is paid under the applicable bid items, and where the embankment item is not in the contract at all, replacement is paid by the extra work and force account method1. A slide or slope failure that is not due to the contractor's negligence or operation is also paid for by force account1.
Three things have to be in the paper for that to work on a private job. Who declares material unsuitable, which should be the engineer of record and not either party to the contract. What the measurement is, since a volume that was never on the plan has to be surveyed before and after it is removed. And which mechanism pays for it. A contract that says the contractor shall remove all unsuitable material, with no declaring party and no pay item, has written a blank line that the two parties will fill in differently.
5. How a cubic yard is measured
Earthwork is the one scope where the quantity is a calculation rather than a count, so the contract has to say whose calculation. Under the state general conditions, plans quantities may or may not represent the exact quantity of work performed or material moved, and the estimated bid quantities are designated as final payment quantities unless the governing specification or that article revises them1. If a measured quantity varies from the contract quantity for an item by more than 5 percent, an adjustment may be made to the quantity paid1. The excavation item itself is measured by the cubic yard in its original position by the method of average end areas1.
Volume change is allocated separately and bluntly: shrinkage or swell factors are the contractor's responsibility, and where factors appear on the plans they are for informational purposes only1.
The change threshold is worth borrowing too. A significant change in the character of the work occurs when the work for an item as altered differs materially in kind or nature from the contract, or when a major item varies by more than 25 percent from the original quantity1. Above 125 percent of the original quantity either party may ask to adjust the unit price on the excess, and below 75 percent either party may ask to adjust it as well1. That is a fair rule in both directions, and it is the answer to the bid that is cheap because a major quantity is understated.
6. Who owns the weather
The state spec book is the clearest demonstration anywhere that a weather clause is a choice, because it offers both choices in the same document. Under a five, six or seven day workweek, working days are charged across the week regardless of weather conditions or material availability1. Under a calendar day count they are charged every day including holidays, again regardless of weather1. Under the standard workweek they are charged only if weather or other conditions permit the principal unit of work underway to proceed for a continuous period of at least seven hours between seven in the morning and six in the evening1. Same book, same work, opposite allocation, and the only thing that decides which one applies is the line in the contract.
The federal set treats weather as a question of excuse rather than of counting. A delay from unforeseeable causes beyond the control and without the fault or negligence of the contractor, and the clause names unusually severe weather among them, extends the time for performance, provided the contractor notifies in writing within ten days of the beginning of the delay5. Note what that buys and what it does not: time, not money.
Two details get left out of private contracts and cost real days. The first is the baseline. The state's own time determination is built on average weather conditions from historic data1, which is what makes "unusually severe" measurable at all; a contract with no baseline has no way to tell a wet week from a wet season. The second is damage as distinct from delay. The excavation item requires the contractor to correct damage to the subgrade caused by weather at no additional cost1, which is a separate risk from the schedule and is frequently the larger one on clay after a hard rain.
7. Who pays for standby
Work stops for reasons that are nobody's weather: a redesign, a utility that was not where the plan put it, an inspection that has not happened, a decision that has not been made. The federal clause lets the owner order the contractor in writing to suspend, delay or interrupt all or part of the work for the period it considers appropriate for its own convenience6. If the work is suspended for an unreasonable period by that order, or by the owner's failure to act within the time required, the contractor gets an equitable adjustment for the increased cost of performance necessarily caused by it, and profit is excluded from that adjustment6. Nothing is owed for a suspension that would have happened anyway from another cause, or where the contract already provides or excludes an adjustment6. The claim has to be asserted in writing as soon as practicable after the suspension ends and no later than final payment, and notice of an act or failure to act other than a suspension order is due within twenty days6.
Idle scrapers and a standing crew are the most expensive thing on a dirt job. A contract with no suspension clause does not eliminate that cost; it just leaves it where it falls, which is on the party that cannot control the reason.
8. Who pays for the retest
Testing allocation is usually written as one line and needs three. Under the state item the engineer determines roadway density and moisture content of the completed section, at random locations chosen by the method in the test procedure's own part four17, and where density is below the required value the engineer may test further to find the extent of the area to correct1. Material removed to allow a density test is replaced and recompacted at no additional expense1.
So the contract should answer three questions, not one. Who retains and pays the laboratory for the scheduled testing. Who pays for the rework when a lift fails, which is properly the contractor. And who pays for the additional testing that a failure triggers, which is the question that gets skipped and the one that recurs, because a failing lift is almost never tested once. Say also what the test is measured against, by naming the laboratory moisture density relationship for each material8, so a passing number is passing against a curve both parties have seen.
9. The indemnity Texas will not enforce
Broad indemnity is the most commonly drafted clause in construction and, in Texas, substantially the least enforceable. In a construction contract, an indemnity provision is void and unenforceable as against public policy to the extent that it requires an indemnitor to indemnify, hold harmless or defend a party against a claim caused by the negligence or fault of the indemnitee9. An additional insured requirement is void to the same extent as the indemnity it accompanies, where it requires or provides coverage whose scope the subchapter prohibits9.
Two things survive and are worth knowing. The rule does not reach a provision requiring indemnification against a claim for the bodily injury or death of an employee of the indemnitor, its agent or its subcontractor of any tier9, which is why that carve-out appears in well drafted subcontracts. And the chapter lists its own exceptions, among them loan documents, surety bonds, workers compensation matters, governmental immunity and municipal public works9.
The practical consequence is that a clause demanding the earthwork contractor indemnify the owner for the owner's own negligence does not transfer that risk. It transfers it until somebody reads the statute, and then the risk is back where it started, uninsured, having been left out of everyone's planning for a year.
| Clause | What it has to say | If it is silent |
|---|---|---|
| Precedence | The order of the plans, the specification, the report and the bid form, and that the specification governs a difference with the drawings2 | The geotechnical report is the standard or mere information, depending on who is quoting it |
| Differing site conditions | Notice before the conditions are disturbed, and an equitable adjustment where they materially differ34 | Subsurface risk sits entirely on the bidder, priced as contingency or fought as a claim |
| Rock | Either a classification and a pay item, or unclassified in terms1 | Unclassified by default, at whatever contingency the bidder guessed |
| Unsuitable material | Who declares it, how it is measured, and which item pays1 | An open quantity with no declaring party and no price |
| Quantities | Plan quantity or measured quantity, the method, and the variance that triggers an adjustment1 | Two calculations and no tiebreaker |
| Weather | Whether days are charged regardless of weather or only when work can proceed, against a stated baseline15 | Charged regardless, with no measure of what unusual means |
| Suspension | Who may stop the work and what standby is worth6 | Idle cost falls on the party that did not cause the stop |
| Testing | Who pays for scheduled tests, for rework, and for the retesting a failure triggers178 | The retesting argument, on every failed lift |
| Indemnity | An indemnity limited to the indemnitor's own fault, with the employee injury carve-out9 | A clause that is void to the extent it reaches the indemnitee's negligence9 |
What we put in our own scope letter
IRONWILL Earthworks sends a scope letter with every proposal that answers all nine before anyone negotiates: the report we priced and where it sits in the order, how we will handle a changed condition and the notice we will give, whether we bid the excavation classified or unclassified and what our reading of the borings was, who we expect to declare material unsuitable, the measurement method and the variance we will accept, which weather allocation the number assumes, what we ask for on a suspension, how testing and retesting are split, and an indemnity written to our own fault. None of it is unusual. It is simply written down, which is the only difference that matters when the ground opens up.
For the documents to ask a bidder for before any of this is drafted, read our note on how a general contractor evaluates an earthwork contractor. For the six questions an owner should settle first, read the questions to ask before you hire.
