The National Labor Relations Board (the Board) petitions for enforcement of an order finding Southwest Security Equipment Corp. (Southwest) guilty of violating National Labor Relations Act (NLRA) § 8(a)(5), 29 U.S.C. § 158 (a)(5) (1982). 1 The Board found that Southwest failed to honor the fringe benefit, hiring hall, 2 and grievance arbitration provisions of its collective bargaining agreement with Local 75 of the Bridge Workers Union (the union).

In a pro forma opinion, 262 N.L.R.B. 665 (1982), the Board adopted the finding of the administrative law judge (ALJ) that Southwest violated its duty to bargain in good faith when it unilaterally abrogated the hiring hall provision of an expired collective bargaining contract. 3

On petition for enforcement, the Board argues that Southwest may not properly *1334 attack the merits of the Board’s hiring hall decision because the company failed to comply with NLRA § 10(e), 29 U.S.C. § 160 (e) (1982), and Board rules requiring a dissatisfied party to file timely and specific exceptions to an unfavorable ALJ report. In the alternative, the Board contends that the hiring hall provision, as a term or condition of employment within the meaning of NLRA § 8(d), 29 U.S.C. § 158 (d) (1982), survives the expiration of the collective bargaining agreement until employer and union bargain to impasse over the fate of the provision in the next contract.

Although we think that Southwest filed timely exceptions, we agree with the Board’s finding that the hiring hall provision survived the contract’s expiration. Therefore, we enforce the Board’s order.

FACTS

Southwest sells, services, and installs bank security equipment. In 1979, the Board certified the Bridge Workers Union as the exclusive bargaining agent for employees working out of the company’s Phoenix, Arizona premises.

After several fits and starts, Southwest President Rick Iglesias signed the union’s master agreement with the Arizona Steel Field Erectors Association, a multi-employer group. 4 The contract, effective from August 1, 1977, through July 31, 1980, covered employees who fabricated, erected, and maintained steel used in safes, vaults, vault doors, safe deposit boxes, and other bank security devices. The contract required employers to hire workers through the union’s hiring hall, and to make payments on their behalf to various union benefit funds.

Between April 22, 1980, and May 16, 1980, Southwest requested, and the union referred, eight employees. Sometime in May, Southwest stopped requesting referrals. Then on May 14, Iglesias informed the union that Southwest would subcontract out for all bargaining unit work. The next day, the union sent a letter to both Iglesias and the multi-employer association stating that the Bridge Workers intended to file a grievance pursuant to the master agreement. Iglesias failed to respond to either the letter or the multi-employer group’s attempts to schedule a grievance hearing.

On June 20, the multi-employer group notified Iglesias that it had scheduled a grievance hearing for July 1. Southwest failed to appear at the hearing, and on July 2, the arbitration committee issued a decision finding the employer guilty of violating, among other things, the master agreement’s hiring hall clause. The union followed up by filing unfair labor practice charges on July 22. Meanwhile, the master agreement expired on July 31.

A year later, on July 29, 1981, the ALJ issued a report concluding that Southwest had violated § 8(a)(5) in failing to honor the fringe benefit, hiring hall, and grievance arbitration provisions. On August 20, acting within the Board’s 20-day procedural framework for filing objections, Southwest submitted general exceptions to the AU’s findings. Exception 5 objected to the AU’s conclusion of law that

Brief for Respondent Southwest Security Equipment Corp. at 8 (quoting from AU report) (emphasis in brief).

Similarly, exception 6 identified a particular AU finding regarding “referral,” but *1335 did not provide specific reasons why the employer objected to the finding.

But on August 26, 1981, the union filed its own limited exceptions to the ALJ’s decision. On September 4, Southwest filed a brief responding to the union’s exceptions and clarifying Southwest’s reasons for objecting to the ALJ’s findings on “referral.” The September 4 brief reasoned that Southwest had not committed an unfair labor practice because the hiring hall provision did not survive the master agreement’s expiration.

Finally, nearly 10 months later, the Board adopted pro forma the ALJ’s report. 262 N.L.R.B. 665 (June 30, 1982). Later, on November 12, 1982, the Board rejected Southwest’s motion for reconsideration. The Board now petitions for enforcement.

STANDARD OF REVIEW

Two standards of review govern our inquiry. As to the timeliness of the employer’s exceptions, we must uphold the Board’s decision unless the Board acted arbitrarily or capriciously. NLRB v. United Association of Journeymen & Apprentices of the Plumbing & Pipefitting Industry, 704 F.2d 1164, 1166 (9th Cir.1983); see also K. Davis, Administrative Law Treatise § 30.10 (1958) (reviewing court may overturn agency’s application of properly-adopted regulation only if application is arbitrary or capricious). But in doubtful situations, we merely give “weight” to the Board’s application of the Act. Joint Council of Teamsters No. 42 v. NLRB, 702 F.2d 168 ,170 (9th Cir.1981) (citing NLRB v. Denver Building & Construction Trades Council, 341 U.S. 675, 692 , 71 S.Ct. 943, 953 , 95 L.Ed. 1284 (1951)), cert. denied, — U.S. —, 104 S.Ct. 100 , 78 L.Ed.2d 105 (1983).

As to the merits of the hiring hall decision, we must defer to the Board’s interpretation of the scope of the bargaining obligation under § 8(d) if that interpretation is “reasonably defensible.” Ford Motor Co. v. NLRB, 441 U.S. 488, 497 , 99 5. Ct. 1842, 1849, 60 L.Ed.2d 420 (1979).

ANALYSIS

A. The Procedures: Specificity of Exceptions

1. The NLRA and the Board’s rules. The NLRA forbids us from considering a matter not presented to the Board or to the AU. Section 10(e) provides:

29 U.S.C. § 160 (e) (1982).

To implement § 10(e), the Board has promulgated several regulations. Rule 102.-46(b), for instance, sets out four requirements that every exception to an ALJ’s findings must meet. 5 One requirement commands the party to “state the grounds for the exception[ ].” 29 C.F.R. § 102 .-46(b)(4) (1983). The rule adds that the Board may disregard or consider waived any exceptions failing to conform to these requirements. Id. Moreover, Rule 102.-48(a) provides for pro forma Board adoption of the ALJ’s findings when the party fails to meet the requirements of Rule 102.-46(b). 6 Finally, Rule 102.46(a) requires the excepting party to file its objections with the Board within 20 days of the date the *1336 AU transfers the case to the Board. Id. § 102.46(a).

2. Applying the requirements. Relying principally on Marshall Field & Co. v. NLRB, 318 U.S. 253, 255 , 63 S.Ct. 585, 586 , 87 L.Ed. 744 (1943), the Board argues that Southwest’s exceptions were so unspecific that they could not effectively apprise the Board of an alleged error in the AU’s findings. The Board reasons that its rules plainly call for more than Southwest’s short demurrer in exceptions 5 and 6, filed August 20, 1981. In fact, the Board says, Southwest did not really identify its quarrel with the AU’s proposed disposition of the hiring hall clause until September 4, 1981, when it filed a brief opposing the union’s limited exceptions to other parts of the ALJ’s report. But the Board contends that this clarification came too late to preserve the hiring hall question for the Board or this court. By then, the 20-day filing deadline had passed.

For three reasons, we think the Board arbitrarily applied § 10(e) and its rules to the facts of this case.

First, Southwest meets this Circuit’s test for determining sufficiency of notice. In NLRB v. Giustina Bros. Lumber Co., 253 F.2d 371 (9th Cir.1958), we held that Rule 102.46(b) prohibited the respondent from raising an issue before the Ninth Circuit where respondent’s objection had been “so ambiguous as to be totally ineffective ” in “adequately apprising]” the Board of the excepting party’s intentions. Id. at 374 (emphasis added). This is a stringent test. But Southwest’s exception to the ALT’s referral, whether considered alone or together with its brief of September 4, constituted a much better effort than “totally ineffective” notice.

Second, although the NLRA vests the Board with great discretion to resolve unfair labor practice disputes, the statute does not permit the Board to use its authority “in a manner [that] deprives a party of a fair and adequate hearing.” NLRB v. Zeno Table Co., 610 F.2d 567, 569 (9th Cir.1979) (citation omitted).

Southwest should not be penalized for making adequate, if somewhat inartful, efforts to raise the hiring hall question below. Even if its August 20 effort was insufficient, its September 4 brief — which was submitted only 15 days after the deadline for filing exceptions had passed — certainly cured the problem and put both the ALT and the Board on notice about Southwest’s hiring hall contention. Indeed, the Board would be hard-pressed to argue that Southwest’s poor notice somehow prejudiced, see Zeno Table, 610 F.2d at 569 , the proceedings. After all, nearly 10 months passed between the date Southwest submitted its September 4 brief clarifying its position, and the date that the Board issued its pro forma decision.

Third, the Board’s own rules and precedents command it to read its procedural rules liberally. E.g., 29 C.F.R. § 102.121 (1983) (“The rules and regulations in this part shall be liberally construed to effectuate the purposes and provisions of the act.”); Daisy’s Originals, Inc., 187 N.L.R.B. 251 , 251 n. 1 (1970) (“[T]he Board makes every effort to apply its rules with such lenience as will effectuate the purposes of the act.” (citation omitted)).

The Board cites a string of cases holding against parties who failed to meet the Board’s procedural standards. But all these cases are distinguishable as extreme examples whose facts, taken as a whole, showed that the excepting parties filed tardily, ambiguously, or not at all. See, e.g., NLRB v. Seven-Up Bottling Co., 344 U.S. 344, 350 , 73 S.Ct. 287, 290 , 97 L.Ed. 377 (1953) (general exception alleging only that decision was contrary to and unsupported by law held insufficient); Stephenson v. NLRB, 614 F.2d 1210, 1214-15 (9th Cir.1980) (per curiam) (exception relying simply on Board Chairman’s dissent below held too ambiguous); NLRB v. STR, Inc., 549 F.2d 641, 642 (9th Cir.1977) (complete failure to file exceptions held insufficient); NLRB v. Selvin, 527 F.2d 1273, 1276 (9th Cir.1975) (exceptions filed 7 months after filing deadline had passed held insufficient); NLRB v. International Association of Bridge Workers, 473 F.2d 816, 817 *1337 (9th Cir.1973) (per curiam) (general exceptions held insufficient for failure to make “any other reference” below to contention urged before court of appeals); NLRB v. Pinkerton’s National Detective Agency, 202 F.2d 230, 233 (9th Cir.1953) (complete failure to raise issue below held insufficient).

We conclude, then, that Southwest filed timely exceptions to the AU’s report. Therefore, the merits of the hiring hall decision are properly before us.

B. The Merits: Hiring Hall Clause Survivability

Hiring hall provisions are common in the construction industry, “where jobs tend to be unpredictable, of short duration, and not with any single employer.” R. Gorman, Basic Text on Labor Law 643 (1976). The hiring hall serves as a “union-operated clearinghouse which matches employers seeking a transitory workforce [with] employees seeking work.” Id.

The well-established presumption is that an employer violates his § 8(a)(5) duty to bargain in good faith if he unilaterally changes the terms of a collective agreement, even after that agreement has expired. As we recently put it:

NLRB v. Carilli, 648 F.2d 1206, 1214 (9th Cir.1981) (citing Peerless Roofing Co. v. NLRB, 641 F.2d 734, 735 (9th Cir.1981); Clear Pine Mouldings, Inc. v. NLRB, 632 F.2d 721, 729 (9th Cir.1980), cert. denied, 451 U.S. 984 , 101 S.Ct. 2317 , 68 L.Ed.2d 841 (1981)); see also American Distributing Co. v. NLRB, 715 F.2d 446, 449 (9th Cir.1983) (applying same principle); Stone Boat Yard v. NLRB, 715 F.2d 441 , 444 (9th Cir.1983) (same) cert. denied, — U.S. —, 104 S.Ct. 1910 , 80 L.Ed.2d 459 (1984); NLRB v. Sky Wolf Sales, 470 F.2d 827, 830 (9th Cir.1972) (same).

The Board contends that under the law established in these cases, Southwest had the duty to honor the hiring hall provision of the master agreement, even after July 31, 1980. The Board reasons that the hiring hall provision, a subject of mandatory bargaining within the meaning of § 8(d), see NLRB v. Tom Joyce Floors, Inc., 353 F.2d 768, 771 (9th Cir.1965), is no different from employee welfare fund and benefits clauses, which routinely survive contract expiration, see, e.g., Carilli, 648 F.2d at 1214 (preserving employer’s payments into union trust fund); Clear Pine Mouldings, 632 F.2d at 729 (preserving existing arrangement for implementing health and welfare plan). 7

But relying on the Board’s analysis in Gordon L. Rayner (Bay Area Sealers), 251 N.L.R.B. 89 (1980), enf'd as modified, 665 F.2d 970 (9th Cir.1982), Southwest contends the fact that the hiring hall provision is a mandatory bargaining subject does not automatically preserve the provision upon the contract’s expiration. Quoting Rayner, Southwest argues that only

Rayner, 251 N.L.R.B. at 90.

According to Southwest, the reasoning behind the Board’s own precedents contemplates that only certain types of contract provisions — such as fringe benefits and other “economic benefits or remunerations that the employees receive[ ] from [the employer] in exchange for their labors,” Sir James, Inc., 183 N.L.R.B. 256 , 259 (1970) (Webster, Tr. Ex.) — are terms or conditions that fit within the “employee/employer” rubric. Hiring hall provisions, Southwest says, are designed to protect the power of unions as institutions, rather than that of individual workers. At the very least, Southwest argues, the Board should conduct its Rayner analysis on the record be.fore deciding that hiring hall provisions are a part of the employer/employee relationship for purposes of § 8(a)(5); the Board should not have adopted pro forma the AU’s findings on this important matter.

Southwest’s argument fails for two reasons.

First, the Board has long held, after careful consideration, that a hiring hall provision is an essential part of the employee/employer, relationship. In Houston Chapter, Associated General Contractors, 143 N.L.R.B. 409 (1963), enf'd, 349 F.2d 449 (5th Cir.1965), cert. denied, 382 U.S. 1026 , 86 S.Ct. 648 , 15 L.Ed.2d 540 (1966), the Board considered whether the union’s demand for a hiring hall provision was a mandatory subject of collective bargaining negotiations within the meaning of § 8(a)(5) and § 8(d). The Board ruled that it was. Borrowing language from NLRB v. Wooster Division of Borg-Warner Corp., 356 U.S. 342, 350 , 78 S.Ct. 718, 723 , 2 L.Ed.2d 823 (1958), the Board explained:

Houston Chapter, Associated Gen. Contractors, 143 N.L.R.B. at 412 (emphasis added). Even the dissent agreed with this assessment. See id. at 415-16 (Rodgers & Leedom, Members, dissenting) (“[T]he hiring hall is not peripheral to industrial relations. It goes right to the core of the employer-employee relationship____”).

Second, Southwest’s argument misapprehends the importance of the hiring hall in industries that use it. Without the hiring hall, the construction employee would find it very difficult to find work or to establish seniority and entitlement to union benefits. Work is sporadic. An employer may need help for a day, a month, or a year. Unless he is lucky, the potential employee may spend more time looking for work than he does actually working. But the hiring hall brings employer and prospective employee together. When an employer needs help, he turns to the union. The union maintains a list of people who need work, and promises to fill employer needs as they arise. See R. Gorman, supra, at 643.

In short, the construction industry hiring hall is an essential component of the employer/ employee relationship. In a sense, the hiring hall is not only part of that relationship, but also the catalyst that makes the relationship possible.

CONCLUSION

We hold that the hiring hall provision, which is properly presented on petition for enforcement, survived the expiration of the collective bargaining agreement. Therefore, we ENFORCE the Board’s order.

. The Board also found Southwest guilty of violating NLRA § 8(a)(1), 29 U.S.C. § 158 (a)(1) (1982). Section 8(a)(1), which makes it an unfair labor practice for an employer to interfere with an employee’s right to engage in or refrain from concerted activities, is often appended as boilerplate to Board complaints charging violations of other § 8(a) provisions.

. A hiring hall is "a union-operated clearinghouse which matches employers seeking a transitory workforce [with] employees seeking work.” R. Gorman, Basic Text on Labor Law 643 (1976). Hiring hall provisions are common in the construction industry. See generally infra pp. 1337, 1338.

. In opposing the Board’s petition for enforcement, Southwest contests only the survivability of the hiring hall clause, and not the survivability of the fringe benefit and grievance arbitration clauses.

. When the union’s representative first contacted Southwest, Iglesias refused to sign the master agreement and said he wanted a special contract because Southwest installed electrical wiring as well as security devices. The master agreement's jurisdiction did not include electrical work. Nonetheless, Iglesias called the union several months later to say he would sign the agreement.

. (b) Each exception (1) shall set forth specifically the questions of procedure, fact, law, or policy to which exceptions are taken; (2) shall identify that part of the administrative law judge's decision to which objection is made; (3) shall designate by precise citation of page the portions of the record relied upon; and (4) shall state the grounds for the exceptions and shall include the citation of authorities unless set forth in a supporting brief____

29 C.F.R. § 102.46 (b) (1983).

. (a) In the event no timely or proper exceptions are filed as herein provided, the findings, conclusions, and recommendations of the administrative law judge as contained in his decision shall, pursuant to section 10(c) of the act, automatically become the decision and order of the Board.

Id. § 102.48(a).

. The administrative law judge analogized the survivability of hiring hall provisions to the survivability of grievance arbitration provisions. In so doing, she relied on the Board’s decision in American Sink Top & Cabinet Co., 242 N.L. R.B. 408 (1979). See 262 N.L.R.B. at 669 (Robbins, A.L.J.).

In the present case, however, two members of the Board, in holding that the hiring hall provision survives, expressly disclaim reliance on American Sink Top. See 262 N.L.R.B. at 665 n. 1 (Van de Water, Chairman & Hunter, Member). But see O’Connor Co. v. Carpenters Local 1408, 702 F.2d 824 , 825 (9th Cir.1983) ("Termination of a collective bargaining agreement does not necessarily extinguish a party's duty to arbitrate grievances arising under the contract.” (citation omitted)).

In any event, we can resolve the case before us without deciding whether an analogy to arbitration clause survivability is appropriate.