1. Governing rules and Petra's complaints
The call expressly requires federal law. The Federal Rules of Evidence govern admissibility, and diversity jurisdiction is assessed under the federal statute even though the underlying negligence claim arises under state law. Relevant evidence generally is admissible unless a specific rule or other applicable ground excludes it; relevance alone does not defeat hearsay or policy-based exclusions.
Petra has personal knowledge of the complaints she made and may testify to those communications. If offered to prove that the tank really leaked over the prior decade, the complaints contain her out-of-court factual assertions and raise hearsay concerns. A party ordinarily cannot introduce her own earlier statement simply by labeling it a party admission; the opposing-party rule applies when the statement is offered against that party.
Here the complaints have an important nonhearsay use: they show Dave had notice of a claimed leak and an opportunity to investigate or repair. Their significance for notice does not depend on whether every reported leak was true. That bears directly on the reasonableness of his response and defeats a blanket hearsay objection. Petra also may describe leaks she personally observed as present trial testimony rather than merely recounting her earlier assertions. The court can limit the complaint evidence to its proper purpose and consider Rule 403 if repetition becomes cumulative.
Accordingly, admission for notice was proper. An instruction distinguishing notice from proof of the underlying condition can prevent the jury from treating the nonhearsay purpose as an unrestricted endorsement of every prior assertion.
2. Dave's instruction to repair the tank
Walt personally heard Dave direct him to caulk the joints when repairing the tank after it fell. A direction to perform work may be nonassertive, and any factual admission by Dave offered against him could fall within Rule 801(d)(2). That resolves only hearsay. Rule 407 separately bars use of subsequent remedial measures to prove negligence or culpable conduct when the measures would have made the earlier harm less likely.
Caulking leaks after the accident is the kind of safety repair the rule encourages without treating it as an admission of earlier fault. Petra appears to offer it to show that Dave should have fixed the leaks before the collapse. She cannot bypass Rule 407 merely by presenting his repair instruction rather than calling the caulking an admission.
The rule allows other appropriate uses, including impeachment or, if disputed, ownership, control, or feasibility. Dave's installation and ownership are not shown to be disputed, nor did he claim caulking was impossible. A general denial of negligence does not automatically open every exception. On the supplied facts the testimony should have been excluded for its apparent negligence-proving purpose. Walt could still testify to independently relevant conditions he observed if a proper foundation and permissible purpose exist, but those are distinct from the fact of the later remedial measure.
3. Gwen's observation that the wall looked old
Rule 701 permits a lay opinion rationally based on the witness's perception, helpful to understanding the testimony or a disputed fact, and not dependent on specialized knowledge. Gwen inspected the wall with Petra the day before the tank fell. Describing it as old is an ordinary visual impression, particularly useful in evaluating Petra's claim that it was only a couple of years old.
Gwen need not be an engineer to describe weathering, visible deterioration, or the general impression of age based on what she saw. Cross-examination can expose uncertainty about actual construction dates. She should not be allowed to claim an exact age requiring knowledge she lacks, but the general observed condition is admissible lay evidence. Her role as a gardener does not automatically disqualify all impressions about a wall on the premises.
4. Structural failure and replacement cost
The assertion that structural cracks could cause the retaining wall to fail is more technical than saying cracks were visible. An estimate that replacement would cost at least $100,000 may also depend on engineering, construction, materials, labor, and dimensions. Rule 701 does not permit a party to evade expert foundations by offering specialized conclusions through a witness described as a lay gardener.
Gwen could testify that she saw cracks, their location, and other perceptible conditions. If her work gave her relevant practical knowledge and the proper Rule 702 qualifications and reliability foundation were established, she might also supply expert testimony; formal academic credentials are not the exclusive route to expertise. The facts, however, establish only that she was Petra's gardener and inspected the wall. They do not show competence to assess structural causation or a reliable basis for the replacement estimate.
The technical failure and dollar conclusions therefore should not have been admitted on this record as ordinary lay opinion. That determination should be separated from the admissibility of her basic observations. Nor does the fact that she mentioned these conclusions to Petra beforehand make them admissible for their truth without a proper present foundation.
5. Petra's acknowledgment
Gwen says Petra responded that Gwen was right and that the wall was at least thirty years old. Offered by Dave against Petra, this is an opposing-party statement under Rule 801(d)(2)(A), not excluded as hearsay. It also contradicts Petra's trial account of a recently built wall and thus bears on credibility. A prior party statement need not have been sworn to qualify under the opposing-party rule.
Depending on its context, the response can also be argued to adopt parts of Gwen's assertion. The court should identify what Petra actually manifested agreement with rather than automatically treating the general words of agreement as expert proof of every technical proposition. Her explicit statement about thirty years is plainly her own relevant admission. The lack of a hearsay bar does not supply Gwen with engineering expertise, but it permits the jury to evaluate Petra's own account and inconsistency.
This statement was made before the accident, not in settlement negotiations or as part of a subsequent repair. No exclusionary rule of that kind appears applicable. Its admission was proper, subject to ordinary relevance and Rule 403 considerations.
6. Subject-matter jurisdiction
Under 28 U.S.C. section 1332, diversity requires complete diversity of citizenship and an amount in controversy exceeding $75,000, exclusive of interest and costs. Natural-person citizenship generally follows domicile. Dave is domiciled in California and Petra in Nevada, so the only identified opposing parties are citizens of different states.
Petra sought $100,000 to replace the wall. A good-faith allegation ordinarily controls unless it is legally certain at filing that the claim could not exceed the jurisdictional threshold. The disputed age and condition of the wall may reduce the merits value, but do not by themselves establish that legal certainty. Indeed, the evidence includes a replacement estimate of $100,000, even though its admissibility and probative weight are contested.
The jury's $20,000 award does not retroactively remove jurisdiction over a case that properly exceeded the threshold when filed. Subject-matter jurisdiction can be raised late and cannot be created by waiver, but a later smaller recovery is not the same as proof that jurisdiction never existed. The court properly denied Dave's motion on the stated facts. Separate evidentiary errors may warrant appellate consideration under the appropriate preservation and harmless-error rules; they do not turn the verdict amount into a jurisdictional defect or automatically require dismissal of the entire action.