¶1
Hunt, J.
— Mountain Construction, Inc., appeals the trial court’s grant of partial summary judgment to David Hoff, a subcontractor’s employee, who was injured when he fell into a deep pit at a construction site for which Mountain was general contractor. Mountain argues the trial court erred in (1) finding that Mountain breached its duty to provide fall restraint protection required by the Washington Industrial Safety and Health Act of 1973 (WISHA), chapter 49.17 RCW, as a matter of law on summary judgment; (2) excluding defense testimony in the subsequent trial on the remaining issues; (3) instructing the jury that Mountain violated WISHA; and (4) denying Moun[541]*541tain’s motion to reconsider the summary judgment ruling that Mountain had violated WISHA as a matter of law. Holding that the trial court did not err, we affirm.
FACTS
I. The Accident
¶2 Mountain Construction hired a subcontractor to excavate a 20-foot-deep pit at a renovation site. When the excavation encountered water, Mountain was unable to pump out the water in order to continue digging. Mountain hired Everson’s Econo-Vac to vacuum the water out of the pit.
¶3 Econo-Vac employees David Hoff and Ed Bertash conferred with David Douglas, the site foreman. The pit was cordoned off with movable poles and yellow caution tape.1 Parts of the barricade were moved out of the way to allow the Econo-Vac truck to access the pit. Hoff and Bertash began vacuuming water from the pit, using their truck and equipment parked at the lip of the pit, while the subcontractor’s track hoe continued excavating within the pit. According to Bertash, they had no harness or fall restraint system.2
¶4 Hoff and Bertash removed two loads of water from the pit without difficulty. As they continued to vacuum, Hoff retrieved an extension for the vacuum from the back of their truck, put down the extension, turned to retrieve a clamp, lost his footing, fell into the pit, and landed on the track-hoe bucket, injuring his foot and hip. The track-hoe operator entered the pit and assisted Hoff up a ladder. Hoff’s foot injury required surgery.
[542]*542II. Procedure
¶5 Hoff sued Mountain and the excavation subcontractor, alleging that Mountain breached its duty to make the site safe, to warn against potentially dangerous conditions, and to maintain the premises in a safe condition according to the law. Hoff moved for summary judgment, citing Mountain’s violations of WISHA.3 Mountain did not mention anything about a guardrail along the pit’s edge.
A. Partial Summary Judgment on WISHA Violation
¶6 The trial court granted partial summary judgment to Hoff, finding “no genuine issues as to any material fact regarding [Mountain’s] breach of its duty to [Hoff] to provide a safe workplace (i.e. failure to have in place safety/fall restraint devices).” Clerk’s Papers (CP) at 379-80. The trial court did find genuine issues of material fact as to causation and Hoff’s potential comparative negligence.
¶7 Mountain moved for clarification, asking the court to specify which section of WISHA Mountain had violated. The trial court specified WAC 296-155-24510.4
¶8 Hoff moved for reconsideration, asking the trial court to find Mountain 100 percent liable. In response, Mountain filed a reply, which included a declaration from its general superintendent, John O’Connor. O’Connor’s declaration mentioned, for the first time, a two-by-four wooden guard[543]*543rail in front of the access point to the pit.5 The trial court denied reconsideration, leaving the proximate cause and comparative negligence issues for the jury.
B. Trial of Remaining Issues
¶9 Douglas testified at trial that (1) Mountain had failed to prepare a fall protection plan;6 (2) Mountain did not obtain a variance, required for inability to comply with general WISHA requirements;7 (3) the guardrail served as a warning line, and it would not stop anyone who slipped and fell; and (4) there was nothing in place at the site to arrest or to prevent a fall into the pit. Douglas was unable to place the guardrail in the area where Hoff had been working in the pit.
¶10 Hoff moved to prevent Mountain from offering testimony suggesting that the wooden guardrail conformed to WISHA fall-arrest/restraint requirements. He argued such testimony would contradict the court’s partial summary judgment order. The trial court suppressed this testimony, ruling that the time for Mountain to have argued that the guardrail complied with WAC 296-155-24510 was at the summary judgment motion.
¶11 In Mountain’s offer of proof,8 O’Connor admitted on cross-examination he could not testify under oath that the [544]*544guardrail could have withstood a force of 200 pounds with minimal deflection, as required by WISHA,9 or that the guardrail had ever been inspected. After its offer of proof, Mountain asked the court to allow O’Connor’s testimony and to reconsider its ruling on the WISHA violation. The trial court ruled that O’Connor’s testimony did not show compliance with WISHA requirements and O’Connor could not testify about the guardrail.
¶12 The trial court accepted Hoff’s proposed jury instructions about Mountain’s responsibility for complying with WISHA fall-arrest/restraint requirements. The jury found Mountain 99 percent liable and Hoff 1 percent contributorily negligent. Mountain appeals.
ANALYSIS
I. Partial Summary Judgment
A. Standard of Review
f 13 When reviewing an order of summary judgment, we engage in the same inquiry as the trial court. Wilson v. Steinbach, 98 Wn.2d 434, 437, 656 P.2d 1030 (1982). Summary judgment is appropriate only if the pleadings, affidavits, depositions, and admissions on file demonstrate the absence of any genuine issues of material fact and that the moving party is entitled to judgment as a matter of law. CR 56(c). The court must consider all facts submitted and all reasonable inferences from them in the light most favorable to the nonmoving party. Wilson, 98 Wn.2d at 437. The nonmoving party may not rely on speculation, argumentative assertions that unresolved factual issues remain, or having its affidavits considered at face value. Seven Gables Corp. v. MGM/UA Entm’t Co., 106 Wn.2d 1, 13, 721 P.2d 1 (1986).
[545]*545fl4 After the moving party has submitted adequate affidavits, the burden shifts to the nonmoving party to set forth specific facts sufficiently rebutting the moving party’s contentions and disclosing the existence of a material issue of fact. Seven Gables, 106 Wn.2d at 13. The trial court should grant summary judgment only if, from all the evidence, reasonable persons could reach but one conclusion. Wilson, 98 Wn.2d at 437. Applying these standards here, we hold that the trial court properly granted partial summary judgment.
B.
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¶1
Hunt, J.
— Mountain Construction, Inc., appeals the trial court’s grant of partial summary judgment to David Hoff, a subcontractor’s employee, who was injured when he fell into a deep pit at a construction site for which Mountain was general contractor. Mountain argues the trial court erred in (1) finding that Mountain breached its duty to provide fall restraint protection required by the Washington Industrial Safety and Health Act of 1973 (WISHA), chapter 49.17 RCW, as a matter of law on summary judgment; (2) excluding defense testimony in the subsequent trial on the remaining issues; (3) instructing the jury that Mountain violated WISHA; and (4) denying Moun[541]*541tain’s motion to reconsider the summary judgment ruling that Mountain had violated WISHA as a matter of law. Holding that the trial court did not err, we affirm.
FACTS
I. The Accident
¶2 Mountain Construction hired a subcontractor to excavate a 20-foot-deep pit at a renovation site. When the excavation encountered water, Mountain was unable to pump out the water in order to continue digging. Mountain hired Everson’s Econo-Vac to vacuum the water out of the pit.
¶3 Econo-Vac employees David Hoff and Ed Bertash conferred with David Douglas, the site foreman. The pit was cordoned off with movable poles and yellow caution tape.1 Parts of the barricade were moved out of the way to allow the Econo-Vac truck to access the pit. Hoff and Bertash began vacuuming water from the pit, using their truck and equipment parked at the lip of the pit, while the subcontractor’s track hoe continued excavating within the pit. According to Bertash, they had no harness or fall restraint system.2
¶4 Hoff and Bertash removed two loads of water from the pit without difficulty. As they continued to vacuum, Hoff retrieved an extension for the vacuum from the back of their truck, put down the extension, turned to retrieve a clamp, lost his footing, fell into the pit, and landed on the track-hoe bucket, injuring his foot and hip. The track-hoe operator entered the pit and assisted Hoff up a ladder. Hoff’s foot injury required surgery.
[542]*542II. Procedure
¶5 Hoff sued Mountain and the excavation subcontractor, alleging that Mountain breached its duty to make the site safe, to warn against potentially dangerous conditions, and to maintain the premises in a safe condition according to the law. Hoff moved for summary judgment, citing Mountain’s violations of WISHA.3 Mountain did not mention anything about a guardrail along the pit’s edge.
A. Partial Summary Judgment on WISHA Violation
¶6 The trial court granted partial summary judgment to Hoff, finding “no genuine issues as to any material fact regarding [Mountain’s] breach of its duty to [Hoff] to provide a safe workplace (i.e. failure to have in place safety/fall restraint devices).” Clerk’s Papers (CP) at 379-80. The trial court did find genuine issues of material fact as to causation and Hoff’s potential comparative negligence.
¶7 Mountain moved for clarification, asking the court to specify which section of WISHA Mountain had violated. The trial court specified WAC 296-155-24510.4
¶8 Hoff moved for reconsideration, asking the trial court to find Mountain 100 percent liable. In response, Mountain filed a reply, which included a declaration from its general superintendent, John O’Connor. O’Connor’s declaration mentioned, for the first time, a two-by-four wooden guard[543]*543rail in front of the access point to the pit.5 The trial court denied reconsideration, leaving the proximate cause and comparative negligence issues for the jury.
B. Trial of Remaining Issues
¶9 Douglas testified at trial that (1) Mountain had failed to prepare a fall protection plan;6 (2) Mountain did not obtain a variance, required for inability to comply with general WISHA requirements;7 (3) the guardrail served as a warning line, and it would not stop anyone who slipped and fell; and (4) there was nothing in place at the site to arrest or to prevent a fall into the pit. Douglas was unable to place the guardrail in the area where Hoff had been working in the pit.
¶10 Hoff moved to prevent Mountain from offering testimony suggesting that the wooden guardrail conformed to WISHA fall-arrest/restraint requirements. He argued such testimony would contradict the court’s partial summary judgment order. The trial court suppressed this testimony, ruling that the time for Mountain to have argued that the guardrail complied with WAC 296-155-24510 was at the summary judgment motion.
¶11 In Mountain’s offer of proof,8 O’Connor admitted on cross-examination he could not testify under oath that the [544]*544guardrail could have withstood a force of 200 pounds with minimal deflection, as required by WISHA,9 or that the guardrail had ever been inspected. After its offer of proof, Mountain asked the court to allow O’Connor’s testimony and to reconsider its ruling on the WISHA violation. The trial court ruled that O’Connor’s testimony did not show compliance with WISHA requirements and O’Connor could not testify about the guardrail.
¶12 The trial court accepted Hoff’s proposed jury instructions about Mountain’s responsibility for complying with WISHA fall-arrest/restraint requirements. The jury found Mountain 99 percent liable and Hoff 1 percent contributorily negligent. Mountain appeals.
ANALYSIS
I. Partial Summary Judgment
A. Standard of Review
f 13 When reviewing an order of summary judgment, we engage in the same inquiry as the trial court. Wilson v. Steinbach, 98 Wn.2d 434, 437, 656 P.2d 1030 (1982). Summary judgment is appropriate only if the pleadings, affidavits, depositions, and admissions on file demonstrate the absence of any genuine issues of material fact and that the moving party is entitled to judgment as a matter of law. CR 56(c). The court must consider all facts submitted and all reasonable inferences from them in the light most favorable to the nonmoving party. Wilson, 98 Wn.2d at 437. The nonmoving party may not rely on speculation, argumentative assertions that unresolved factual issues remain, or having its affidavits considered at face value. Seven Gables Corp. v. MGM/UA Entm’t Co., 106 Wn.2d 1, 13, 721 P.2d 1 (1986).
[545]*545fl4 After the moving party has submitted adequate affidavits, the burden shifts to the nonmoving party to set forth specific facts sufficiently rebutting the moving party’s contentions and disclosing the existence of a material issue of fact. Seven Gables, 106 Wn.2d at 13. The trial court should grant summary judgment only if, from all the evidence, reasonable persons could reach but one conclusion. Wilson, 98 Wn.2d at 437. Applying these standards here, we hold that the trial court properly granted partial summary judgment.
B. Contractor’s Duty to Comply With WISHA
¶15 General contractors have a specific, nondelegable duty to comply with WISHA regulations for the benefit of their employees and independent contractors’ employees. Kinney v. Space Needle Corp., 121 Wn. App. 242, 248, 85 P.3d 918 (2004). WISHA requires the employer to “develop and implement a written fall protection work plan including each area of the work place where the employees are assigned and where fall hazards of 10 feet or more exist.” WAC 296-155-24505 (emphasis added). “When employees are exposed to a hazard of falling from a location 10 feet or more in height, the employer shall ensure that fall restraint, fall arrest systems or positioning device systems are provided, installed, and implemented.” WAC 296-155--24510 (emphasis added).
¶16 It is undisputed that Mountain’s excavation pit was more than 10 feet deep. Mountain argues, however, that these WAC fall restraint provisions apply only to potential falls from roofs or through floor or wall openings, not to potential falls into excavation pits. Mountain argues that WAC 296-155-655, which establishes general protection requirements for excavating, trenching, and shoring, applies. We disagree.
¶17 First, the title of the fall restraint chapter reads generally: “SAFETY STANDARDS FOR CONSTRUCTION WORK,” PART C-l, “FALL RESTRAINT AND FALL ARREST.” WAC 296-155-24510.
[546]*546¶18 Second, the plain language of WAC 296-155-24510 does not limit its application to roofing or other above-ground work. Instead, it uses broader terminology, namely an employee’s exposure to a “hazard of falling from a location 10 feet or more in height,” which clearly includes potential falls from the ground’s surface into below-ground holes. WAC 296-155-24510 (emphasis added).
¶19 For example, rather than providing comprehensive standards confined to roofing, WAC 296-155-24510 cross-references other rules that expressly address required safety measures for roofs of specified pitches. See, e.g., WAC 296-155-24515(3), referenced in WAC 296-155-24510(l)(c). Similarly, subsection WAC 296-155-24510(4)’s reference to “[d]roplines or lifelines used on rock scaling operations”10 does not confine WAC 296-155-24510’s application to rock scaling. Moreover, this subsection’s focus on rock scaling defeats Mountain’s argument that WAC 296-155-24510 applies only to falls from roofs, floors, and walls. Requiring specific types of fall restraint for particular types of construction work, such as roofing and rock scaling, does not nullify the rest of this code provision’s application to fall hazards in general. Rather, by its plain language, WAC 296-155-24510 applies to construction work in general that presents fall hazards to workers.
¶20 We hold, therefore, as the trial court ruled, Mountain had a specific duty 11 under WAC 296-155-24505 and WAC 296-155-24510, respectively, to develop and to implement a fall protection plan and a fall-restraint/arrest or positioning system at the work site. We next address whether Mountain breached that duty as a matter of law.
C. Breach of Duty: Noncompliance with WISHA
¶21 WAC 296-155-24510 provides several fall pro[547]*547tection options. “Fall restraint” includes guardrails capable of supporting 200 pounds with a minimum of deflection, safety belts/harnesses, or a warning line system with a tensile strength of 200 pounds and a safety monitor. WAC 296-155-24510(1). “Fall arrest” includes full-body harnesses, safety nets, and catch platforms. WAC 296-155--24510(2). Positioning device systems are rigged so that an employee cannot free fall more than two feet. WAC 296-155--24510(3). Mountain failed to establish compliance with any of these fall protection options either on summary judgment or at trial.12
¶22 In response to Hoff’s motion for summary judgment, Mountain presented evidence of a warning line system consisting of yellow caution tape and poles positioned around the pit approximately 20 feet back from the edges. But this warning line lacked the required tensile strength of 200 pounds. Moreover, Mountain removed it to allow the Econo-Vac truck access to the pit.
123 Moreover, the record does not show a safety monitor system protecting workers between the warning line and the pit’s edge. And the record is clear that Mountain did not provide fall arrest/restraint devices and that Hoff was not attached to a fall restraint harness or some equivalent device to prevent a fall into the pit.13
¶24 Viewing the evidence presented at summary judgment in the light most favorable to Mountain, there was no genuine issue of material fact as to its failure to implement fall protection at the pit. Mountain claims it complied with its duty by erecting a warning line. But in order for a warning line to satisfy WAC 296-155-24510, it [548]*548must have a tensile strength of 200 pounds and there must be a safety monitor for workers crossing the line. Neither was present here. Similarly, there were no fall arrest or restraint devices. Even if Hoff refused such a device, Mountain had a nondelegable duty to implement the device. Kinney, 121 Wn. App. at 248. Allowing Hoff to work without such a device was a breach of this duty.14
f 25 Partial summary judgment was proper. We now turn to the alleged errors at the subsequent jury trial on the remaining factual issues
II. Limitation of Trial Testimony
¶26 Mountain argues that the trial court erred in limiting the trial testimonies of O’Connor and industrial safety expert Mark Lawless such that it could not attempt to show that the wooden barrier along one side of the pit complied with WAC 296-155-24510, in “circumvention of [the trial court’s] prior ruling.”15 Report of Proceedings (RP) at 582. We review trial court limitations on testimony for abuse of discretion. Tortes v. King County, 119 Wn. App. 1, 12, 84 P.3d 252 (2003), review denied, 151 Wn.2d 1010 (2004).“Discretion [549]*549is abused when the trial court’s decision is manifestly unreasonable, or is exercised on untenable grounds, or for untenable reasons.” State v. Blackwell, 120 Wn.2d 822, 830, 845 P.2d 1017 (1993). We find no abuse of discretion here.
¶27 The trial court allowed O’Connor to testify about whether he had discussed a safety harness with Hoff, whether Hoff had refused a harness, safety warnings, and where the Econo-Vac truck was located with respect to the pit’s edge. But according to Mountain’s offer of proof, even if the trial court had allowed O’Connor to testify about the guardrail, he would have testified only that there was a partial guardrail in place at the access point to the pit, along only one of the four sides of the excavation pit; he would not have testified that the guardrail could withstand 200 pounds of force, as WAC 296-155-24510(l)(a) required.16 Moreover, the guardrail had not been inspected, as required by WAC 296-155-24510(l)(b)(v), which provides: “Components of fall restraint systems shall be inspected prior to each use for mildew, wear, damage, and other deterioration, and defective components shall be removed from service if their function or strength have been adversely affected.”
¶28 Accordingly, we hold that the trial court’s limitation of O’Connor’s offered testimony was not error.
¶29 In spite of court-imposed limitations, Lawless testified at trial about (1) basic safety requirements at construction sites, which are “basically work specific and site specific,” RP at 608; (2) the hazard at the Mountain construction site being “the potential for a worker to fall,” RP at 609; (3) recognized, standard fall protection practices, including “lanyards and harnesses, ancillary devices, barricades, warning lines, covers, nets, or what are called catchplatforms,” RP at 610; and (4) the warning line that Mountain installed at its construction site, consisting of [550]*550four foot tall orange stanchions set on a base plate.
with a yellow ribbon or what might be termed caution tape established between those poles.
And that was the fall protection mechanism that was employed by Mountain Construction around the perimeter of the excavation.
RP at 610-11 (emphasis added).17
¶30 Mountain’s theory of the case seems to be that it needed to implement only those safety requirements specified for shoring, trenching, or excavating, and, therefore, its warning line was sufficient. Mountain continues to argue on appeal that WISHA fall restraint requirements do not apply to its excavation pit. Having upheld the trial court’s summary judgment ruling that WAC 296-155-24510 fall restraint requirements applied to Mountain’s excavation and that Mountain failed to comply as a matter of law, we find no abuse of discretion in the trial court’s decision to limit, Mountain’s witnesses’ testimonies to avoid this issue.
¶31 Affirmed.
Armstrong and Van Deren, JJ., concur.