OPINION RE: PHASE ONE BENCH TRIAL

Defendant General Reinsurance Corporation (“General Reinsurance”) issued an excess insurance policy to Plaintiff San Francisco Bay Area Rapid Transit District (“BART”), which is a self-insured employer for workers’ compensation. This dispute arisés out of a multiple myeloma workers’ compensation claim of a former BART employee, Michael Gonsolin (“Gonsolin”), which BART settled with Gonsolin before the Workers’ Compensation Appeals Board (“WC Appeals Board”). BART contends that General Reinsurance is obligated to pay the claim because, as stipulated by the parties before the WC Appeals Board, and found by the WC Appeals Board, Gonsolin’s injury occurred during the policy period, and BART has reached its retention limit triggering General Reinsurance’s coverage. General Reinsurance contends that it has no obligation to pay because Gonsolin’s injury in fact occurred after its policy had ended.

The parties agreed to resolve their dispute in a bench trial based upon stipulated facts. In Phase One the Court must decide whether the parties can litigate the date of injury; that is, whether for purposes of the application of the excess policy, General Reinsurance is bound by the decision of the WC Appeals Board. After carefully considering the parties’ submissions (Dkt.Nos.35, 36), and having had the benefit of oral argument on May 28, 2015, the Court finds that under the circum *1060 stances here General Reinsurance is not bound in this breach of contract action by the date of injury that the WC Appeals Board found.

BACKGROUND 1

A. The Policy at Issue

BART is self-insured for workers’ compensation claim purposes. It nonetheless purchases excess insurance to cover claims that exceed a particular amount. General Reinsurance issued BART an Excess Insurance Policy For Self-Insurer Of Workers’ Compensation and Employers Liability Policy (the “Policy”), effective July 1, 1985 through July 1, 1992. Under the Policy’s terms, BART had a $500,000 retention on workers’ compensation claims, meaning that BART was obligated to pay the first $500,000 and General Reinsurance was obligated to indemnify BART up to $10,000,000 in excess of that retention. (See Dkt. No. 34-1 at l.) 2 The Policy applies to “losses paid by” BART for “bodily injury by disease,” provided

(Id. at 3.) When the Policy ended in 1992, BART obtained an excess insurance policy with a different insurer, but with the same retention amount. Beginning in 2002 and through the present, BART’s excess insurance policies have had a much higher retention amount. (Dkt.34-3.)

B. Gonsolin’s Workers’ Compensation Claim

Michael Gonsolin worked as a BART police officer from 1979 to 2005, except for 1985 to 1987, when he worked as a detective. Gonsolin retired in 2005, and in October 2006 he was diagnosed with multiple myeloma. The following month Gonsolin filed an Application for Adjudication of Claim in WC Appeals Board Case No. SFO 0499837 (the “myeloma case”). Gonsolin claimed that he was entitled to workers’ compensation benefits due to his cumulative exposure to carcinogens, specifically benzene, 3 while employed as a BART police officer. In his application, he listed the date of injury as “CT [cumulative trauma]” through October 13, 2006. (Dkt. No. 34-40 at 168.)

California’s workers’ compensation statutory scheme provides that “liability for occupational disease or cumulative injury” is limited to the employer who employed the claimant “during a period of four years immediately preceding either the date of injury, as determined pursuant to Section 5412, or the last date on which the employee was employed in an occupation exposing him or her to the hazards of the occupational disease or cumulative, injury, whichever occurs first.” Labor Code § 5505.5(a). Labor Code Section 5412, which governs the date of injury for occupational diseases or cumulative injury, defines date of injury as “that date upon which the employee first suffered disability therefrom and either knew, or in the exercise of reasonable diligence should have known, that such disability was caused by *1061 his present or prior employment.” Id. § 5412. “The fact of injury (exposure) and the date of injury (disability), by definition, are not equivalent in cases involving the latent effects of an occupational disease.” See Chevron U.S.A., Inc. v. WC Appeals Bd., 219 Cal.App.3d 1265, 1271 , 268 Cal.Rptr. 699 (1990).

Special rules govern defining and proving injury when the occupational injury is cancer developed by peace officers exposed to carcinogens known to cause cancer. Labor Code § 3212.1. Under such circumstances, California law provides that “[t]he cancer so developing or manifesting itself in these cases shall be presumed to arise out of and in the course of employment.” Id. § 3212.1(d) (emphasis added). The presumption relates to the connection between the exposure and the disease, not to a particular date of injury. See Faust v. San Diego, No. SDO 244774, 68 Cal. Comp. Cases 1822 , 2003 WL 23148877 , at *6-7 (W.C.A.B. Dec. 11, 2003) (en banc). The “presumption is disputable and may be controverted by evidence that the primary site of the cancer has been established and that the carcinogen to which the member has demonstrated exposure is not reasonably linked to the disabling can-cert,]” but “[u]nless so controverted, the [WC Appeals Board] is bound to find in accordance with the presumption.” Id. In Ennis v. BART, 72 Cal. Comp. Cases 1694 (2007), the WC Appeals Board held that the Section 3212.1 cancer presumption applies to BART police officers.

On January 26, 2007, Athens Administrators, BART’s workers’ compensation claims administrator, denied Gonsolin’s claim, concluding that his “claim for cancer does not fall within the presumptions under Labor Code [Sections] 3213.5 and 3212.6 ... and there is no medical evidence to indicate that [his] cancer is related to [his] employment.” (Dkt. No. 34-39 at 17.) The matter then proceeded through the WC Appeals Board. On March 23, 2007, Gonsolin was deposed in connection with his myeloma case, and on April 19, 2007, Dr. Revels Cayton, a board-certified internal medicine and pulmonary disease specialist chosen -to be the Agreed Medical Examiner (“AME”) assigned to the case, issued a report regarding Gonsolin’s condition. Among other things, Dr. Cayton found that “Mr. Gonsolin’s multiple myeloma has reasonably been caused by his benzene exposure in the workplace.” (Dkt. No. 34-14 at 8.) Dr. Cayton was deposed on August 23, 2007 and testified that the average latency period for multiple myeloma is 8 to 10 years. (Dkt. No. 34-15 at 4; see also Dkt. No. 34-37 at 15 (“[T]he average latency is probably eight to ten years. It can extend out, and it can be shorter, but eight to ten years would cover most bases.”).) Discovery in Gonsolin’s myeloma case closed on October 12, 2007.

Later that month, BART’s claims administrator reviewed a study from September and October 2007 that concluded, in relevant part, that there were no detectable levels of benzene present at any BART facilities and that “BART Police Sergeants are not exposed to Benzene in the course of their work.” (Dkt. No. 34-18 at 1.) BART thereafter filed a petition for removal to reopen discovery in the Gonsolin myeloma case to further depose Dr. Cay-ton about that study; specifically, BART argued that Dr. Cayton’s analysis was “flawed” insofar as he had relied on inaccurate data about benzene levels in BART facilities to reach the conclusion that Gonsolin’s benzene exposure caused his myeloma. (See Dkt. No. 34-19 at 5.) BART further contended that Dr. Cayton was “cajoled” by Gonsolin’s attorney to find that Gonsolin had been exposed to “threshold levels” of benzene that caused his disease. (Id.) On November 19, 2007, the WC Appeals Board judge rejected those *1062 arguments and issued a report recommending that the petition be denied. (Dkt. No. 34-21 at 5.)

Also in November of 2007, the California Court of Appeal denied a petition for writ of review of the decision in Ennis v. BART, 72 Cal. Comp. Cases 1694 (2007), in which the WC Appeals Board had held that the Labor Code Section 3212.1 cancer presumption applies to BART police officers. In the wake of that decision, BART’s attorney noted that it would have “a very difficult time prevailing on a question of’ whether Gonsolin’s myeloma is a condition arising out of and occurring in the course of his employment. (Dkt. No. 34-22 at 2.)

BART thereafter sought to settle Gonsolin’s myeloma claim. The proposed settlement involved, among other things, obtaining Dr. Cayton’s opinion on the date of injury. On December 5, 2007, BART provided its excess insurer for injuries occurring in 2002 and later (not defendant General Insurance) a First Notice of Loss that represented the date of injury was October 13, 2006. (Dkt. No. 34-25.) The next day, Dr. Cayton issued a letter to BART and Gonsolin, regarding the date of injury, in which he states that “[t]he latency period for Mr. Gonsolin’s myeloma is fifteen years” ... therefore “exposures prior to 1991 were injurious.” (Dkt. No. 34-26.)

On December 14, 2007, BART and Gonsolin reached an agreement and presented settlement terms to the WC Appeals Board, which thereafter entered a Partial Order Approving Compromise and Release with Open Medical Award and Partial Compromise and Release. The order was partial insofar as the WC Appeals Board reserved jurisdiction over an outstanding lien claim pertaining to certain medical expenses. (See Dkt. No. 34-27 at 3-4.) The agreement resolved the dispute for $200,000 and stated in relevant part that the “[p]arties stipulate there is a dispute regarding] date of injury, but based upon new medical information contained within Dr. Cayton’s [Agreed Medical Examiner] report of [December 6, 2007], [the] parties stipulate to a date of injury of ... [November 1, 1990 to October 31, 1991], pursuant to [Labor Code § ] 5500.5.” (Id. at 5.) Hearing minutes from the proceeding approving the settlement likewise reflect that “[t]he parties stipulate that there is a dispute regarding the date of injury!,] but based upon the recent medical information set forth by Dr. Cayton ... the parties now stipulate to a date of injury described as cumulative trauma from November 1, 1990 through October 31, 1991 pursuant to Labor Code section 5500.5.” (Dkt. No. 34-28 at 3.)

C. BART/General Reinsurance Reimbursement History

One week after the settlement was approved, Athens claims supervisor Jan Ramacciotti sent a Notice of Claim via email to .Genesis Underwriting Management Company (“Genesis”), the entity authorized to receive the claim on General Reinsurance’s behalf. This Notice of Claim was nearly identical to the one sent to the later excess insurer, but it listed October 31, 1991 as the date of injury instead of October 13, 2006. (Dkt. No. 34-29 at 2.) The Notice of Claim itself did not indicate that Gonsolin continued to work for BART through 2005.

Genesis did not respond to the first notice or to Ramacciotti’s follow-up email of January 2008, so Ramacciotti called Genesis and spoke with claim examiner Edith Coutinho on February 25, 2008. In March and April of 2008, Ramacciotti and Coutinho spoke about the claim again. According to Ramacciotti’s notes, on March 17, 2008, Coutinho requested “just an update” and materials from Dr. Cayton, not the entire universe of medical and legal docu *1063 ments. (Dkt. No. 34-8 at 2.) In response, on March 21, 2008, Ramacciotti provided case documents to Coutinho, including a status report from defense counsel that mentioned latency but did not state outright that Gonsolin continued to work for BART through 2005. (Dkt. No. 34-31.) Defense counsel’s summary represented that “the applicant, a police officer, sustained multiple myeloma/cancer as a result of his cumulative exposure to carcinogens through October 13, 2006.” (Id. at 1.) In addition to defense counsel’s report, Ramacciotti provided Dr. Cayton’s deposition, medical report, and his December 6 letter regarding date of injury; and the WC Appeal Board’s order approving the settlement. The attached report of Dr. Cayton states that Gonsolin “worked as a police officer for BART from 1979 until September 11, 2005.” (Dkt. No. 34-31 at 8.) Athens sent Genesis the award itself on April 4, 2008. (Dkt. No. 34-34.)

In September of 2008, Coutinho emailed Ramacciotti noting that she still had not received the documents requested in March 2008. In response, by the first week of October an Athens claims examiner sent the full legal and medical file in Gonsolin’s case, which Genesis received by October 7, 2008. This file included Dr. Cayton’s deposition, which repeatedly mentions that Gonsolin worked for BART through 2005. (See, e.g., Dkt. No. 34-37 at 35; Dkt. No. 34-39 at 27; Dkt. No. 34-40 at 141; Dkt. No. 34-41 at 23.) The file also included a letter from defense counsel from December 2007 indicating that Dr. Cayton had revised his opinions regarding the applicant’s date of injury, and that both he and the WC Appeals Board judge concluded that the date of injury was prior to 1991. (Dkt. No. 34-38 at 40-41.)

On October 7, 2008, Coutinho requested further information about Gonsolin’s current medical condition. Athens’ response email noted that the outstanding medical lien likely would exceed BART’s payment ceiling and, accordingly, would require General Reinsurance to pay out on the policy, and therefore resolution of the lien claims would require General Reinsurance’s agreement. To that end, Athens sent Genesis a Settlement Authority Request, noting that Gonsolin’s medical bills to date were nearly $700,000, and noting that monies paid beyond $500,000 were subject to reimbursement from General Reinsurance as the excess carrier. On September 17, 2009, an Athens claims administrator wrote to Coutinho requesting reimbursement from General Reinsurance in the amount of $212,077.28, as Gonsolin’s total medical bills had reached $712,077.28. The following month, Athens received a reimbursement check for BART from General Reinsurance for $192,535.02. A year later, Athens requested further reimbursement of $73,021.75 for Gonsolin’s continued myeloma treatment, and on December 14, 2010 General Reinsurance reimbursed BART $64,422.97. In August of 2011 Athens submitted a third reimbursement request on BART’s behalf, this time seeking $130,000 for indemnity and $697,987.55 for medical claims, less the prior reimbursements. In November of 2011, General Reinsurance sent BART $70,112.11 in further reimbursement. In total, General Reinsurance reimbursed BART for medical expenses in the amount of $327,070.10.

It was not until January 27, 2012 that General Reinsurance notified BART and Athens that it had “no obligation under the Policy with respect to the Gonsolin Claim” and was therefore “entitled to reimbursement from BART of $327,070 previously paid on the claim.” (Dkt. No. 3451 at 1.) BART has continued to administer the Gonsolin claim, and since August of 2011 it has paid approximately $300,000 in excess of its $500,000 self-insured retention that General Reinsurance has not reimbursed.

*1064 D. Procedural History

BART initiated this breach of contract action in Alameda County Superior Court on January 24, 2014. Thereafter General Reinsurance removed to matter to federal court, and the Court denied BART’s motion to remand. (Dkt. No. 16.) In March 2015, the Court agreed to the parties’ stipulation to try this matter in two phases. In Phase One, the Court will determine based on stipulated facts whether the “date of injury” is subject to litigation in this action or whether General Reinsurance is bound by the WC Appeals Board finding. If it is so bound, then General Reinsurance must indemnify BART. If BART prevails on the Phase One issue, then in Phase Two the Court will determine whether BART is entitled to attorneys’ fees. If, on the other hand, General Reinsurance prevails at Phase One, then at Phase Two the Court instead will determine whether the date of injury falls within General Reinsurance’s policy period. {See Dkt. No. 28-1.) The parties’ Phase One briefing is now before the Court..

DISCUSSION

The Court must decide whether General Reinsurance is bound by the date of injury identified in the WC Appeals Board’s compensation award. General Reinsurance advances a host of reasons why the workers’ compensation judge did not make a correct factual determination about the date of injury, and even if she did, why the decision was wrong due to errors that BART and Gonsolin made regarding the law, misrepresentations they purportedly made to the workers’ compensation judge, and the judge’s improper adoption of a medical opinion that, in General Reinsurance’s view, lacked sufficient support in medical evidence. But these arguments all put the proverbial cart before the horse: at this stage of the litigation, the question is not whether the date of injury was wrong or why that might be the case; rather, the question is only whether General Reinsurance can seek to establish a different date of injury in this breach of contract action. BART argues that the Court has no jurisdiction to change the date of injury that the WC Appeals Board determined, and even if it does, General Reinsurance is nonetheless barred from asserting a different date of injury now.

A. The Court has Jurisdiction to Make a Factual Finding About the Date of Injury

There is no dispute that this federal court has diversity jurisdiction of this state law breach of contract this action. BART instead argues that the Court lacks jurisdiction to find a different date of injury from that found by the WC Appeals Board for a variety of reasons. The Court disagrees.

1. In this Context, Date of Injury is Not Within the WC Appeal Board’s Exclusive Jurisdiction

Labor Code Section 5300 defines the “exclusive jurisdiction” of the WC Appeals Board, and provides in relevant part that all of the following proceedings “shall be instituted before the [WC Appeals Board] and not elsewhere”:

Labor Code § 5300. Section 5300 is limited to claims involving compensation to the employee. In Millman v. Contra Costa Cnty., W.C.A.B. No. ADJ1527953, 2013 Cal. Wrk. Comp. P.D. LEXIS 615 (Appeals Bd. noteworthy panel decision), summarized at 79 Cal. Comp. Cases 439 , 2014 Cal. Wrk. Comp. LEXIS 32 (Dec. 13, 2013), a WC Appeals Board panel held that it does not have jurisdiction to resolve a contract dispute between a self-insured employer and its excess insurer. In other words, the panel held that Division Four of the Labor Code (the workers’ compensation statutory scheme, including Section 5300) is limited to disputes involving workers’ compensation claims, including claims against workers’ compensation policies. An excess insurance policy, however, is not a workers’ compensation policy and thus not subject to Division Four. M 4 This holding makes sense. Indeed, BART initiated its breach of contract action against General Reinsurance in state court because it, too, does not believe that the exclusive jurisdiction of Labor Code Section 5300 applies to its contract action.

The real question, then, is whether this Court has jurisdiction to make a finding in a contract action that is contrary to a finding made by the WC Appeals Board. While perhaps not optimal, and a situation to be avoided if possible, BART offers no authority that supports its assertion that this Court is without jurisdiction to do so. BART tries to reframe the question as whether the Court has jurisdiction to “alter” or “change” the finding of the WC Appeals Board. But this Court is not reviewing any decision of the WC Appeals Board, and any decision the Court makes will not affect the WC Appeals Board’s decision as to the compensation BART, as a self-insured employer, owes its former employee. Put simply, regardless of this case’s outcome, BART will remain liable to Gonsolin as a self-insured employer even if it is determined that General Reinsurance is not the proper excess carrier because the date of injury fell outside of the Policy period.

It follows, then, that BART’s argument that 28 U.S.C. § 1257 deprives this Court of subject matter jurisdiction also fails. Section 1257 states that “federal review of state court judgments can be obtained only in the United States Supreme Court.” True. But this Court is not reviewing the WC Appeals Board order and is not and will not review the decision awarding the claimant benefits from BART. Instead, this case is limited to a breach of contract dispute between BART and General Reinsurance. The same fate applies to BART’s reliance on Labor Code Section 5302 as depriving this Court of jurisdiction to decide the date of injury for purposes of BART’s breach of contract claim. Section 5302 merely speaks to the finality of WC Appeals Board orders. Again, this action is not about the WC Appeals Board order, and this Court has no jurisdiction to review that order. This action is only about BART’s breach of contract action against General Reinsurance.

The Court similarly rejects BART’s assertion that pursuant to the *1066 Rooker Feldman doctrine this Court lacks jurisdiction to decide the date of injury. Rooker-Feldman prohibits federal district courts “from exercising subject matter jurisdiction over a suit that is a de facto appeal from a state court judgment.” Kougasian v. TMSL, Inc., 359 F.3d 1136, 1139 (9th Cir.2004). The Rooker-Feldman doctrine bars subject matter jurisdiction in federal district court if “a federal plaintiff asserts as^a legal wrong an allegedly erroneous decision by a state court, and seeks relief from a state court judgment based on that decision.” Noel v. Hall, 341 F.3d 1148, 1164 (9th Cir.2003); see also ScripsAm., Inc. v. Ironridge Global LLC, 56 F.Supp.3d 1121, 1137 (C.D.Cal.2014) (“A losing party in state court is thus barred from seeking what in substance would be appellate review of a state judgment in federal district court[.]” (citation omitted)). Put another way, if “adjudication of the federal claims would undercut [a] state ruling, the federal [claim] must be dismissed for lack of subject matter jurisdiction.” Bianchi v. Rylaarsdam, 334 F.3d 895, 898 (9th Cir.2003). Rooker-Feldman also bars a defendant from asserting a substantive defense that attacks a state court judgment. See MacKay v. Pfeil, 827 F.2d 540, 544-45 (9th Cir.1987). But this action does not attack the WC Appeals Board order; thus Rooker-Feldman does not apply.

Moreover, Rooker-Feldman cannot be applied against anyone who was not a party to the state court action, see So. Cal. Edison Co. v. Lynch, 307 F.3d 794 , 805 (9th Cir.2002) (“The Rooker-Feldman doctrine does not bar the exercise of federal court jurisdiction when the federal court litigant was not a party to the state court action.”) (citation omitted), even if the party against whom the doctrine is asserted is in privity to a party to the earlier action, see Lance v. Dennis, 546 U.S. 459, 466 , 126 S.Ct. 1198 , 163 L.Ed.2d 1059 (2006); see also Bennett v. Yoshina, 140 F.3d 1218, 1224 (9th Cir.1998) (“[M]ere participation in the state case ... does not invoke the Rooker/Feldman bar.”). Thus, because General Reinsurance was not a party to the WC Appeals Board proceedings, Rook-er-Feldman does not bar these claims. What is more, the doctrine does not apply to suits seeking review of state agency action. See Exxon Mobil Corp. v. Saudi Basic Indus. Corp., 544 U.S. 280, 287 , 125 S.Ct. 1517 , 161 L.Ed.2d 454 (2005) (citing Verizon Md. Inc. v. Pub. Serv. Comm’n of Md., 535 U.S. 635 , 644 n. 3, 122 S.Ct. 1753 , 152 L.Ed.2d 871 (2002)). Thus, even though the WC Appeals Board decision was final, it was a final agency decision and therefore the Rooker-Feldman bar does not apply for this additional reason.

The conclusion that this action will not affect BART’s obligations to Gonsolin is consistent with those cases holding that the courts, as opposed to the WC Appeals Board, have exclusive jurisdiction over contract and tort actions for damages that relate to an underlying workers’ compensation action. See La Jolla Beach & Tennis Club, Inc. v. Indus. Indem. Co., 9 Cal.4th 27, 35 , 36 Cal.Rptr.2d 100 , 884 P.2d 1048 (1994); see also Scott v. Indus. Acc. Comm., 46 Cal.2d 76, 82-83 , 293 P.2d 18 (1956) (“[T]he superior court cannot award workmen’s compensation benefits, and the [WC Appeals Board] cannot award damages for injuries.”); U.S. Fidelity & Guar. Co. v. Lee Investments LLC, 641 F.3d 1126, 1135 (9th Cir.2011) (WC Appeals Board lacks jurisdiction over actions by a workers’ compensation insurer against the insured-employer for rescission and reimbursement of policy proceeds); Victor Valley Transit Auth. v. WC Appeals Bd., 83 Cal.App.4th 1068, 1070 , 100 Cal.Rptr.2d 235 (2000) (superior court, not WC Appeals Board, has jurisdiction over contribution action by one city against another for reimbursement payment of works’ compen *1067 sation benefits); Salimi v. State Comp. Ins. Fund, 54 Cal.App.4th 216, 218 , 62 Cal.Rptr.2d 640 (1997) (holding that the superior court has jurisdiction over employer’s suit against workers’ compensation insurer for breach of contract for failure to defend a workers’ compensation claim).

BART’s reliance on General Reinsurance Corp. v. WC Appeals Board (“St. Jude Joinder Case ”), No. A092380, 65 Cal. Comp. Cases 1441 (2000), is misplaced. After the employer, St. Jude, and the claimant had reached a settlement, the claimant sought to obtain penalties from St. Jude for late payments. The penalties were likely to exhaust St. Jude’s retention with its excess insurer, General Reinsurance; accordingly, St. Jude sought successfully to join General Reinsurance to the workers’ compensation proceeding. In denying General Reinsurance’s writ petition, the California Court of Appeal held that an excess insurer may be joined to a workers’ compensation proceeding pursuant to Labor Code Section 3753, which permits an injured worker to join “any insurer,” and Section 5307.5(b), which authorizes the joinder of “all persons interested in the proceeding.” Id. at 1444. Thus, St. Jude stands for the proposition that an excess insurer may be a party to a workers’ compensation proceeding; it does not in any way support BART’s argument that when neither the employee nor the employer joins the excess insurer, a civil court is without jurisdiction to adjudicate any facts that were adjudicated in the workers’ compensation proceeding.

Accordingly, the Court is not stripped of its jurisdiction to make a factual determination regarding the date of injury to resolve the parties’ coverage dispute. Because this action it pertains exclusively to whether General Reinsurance is obligated to indemnify BART and has no effect on Gonsolin’s statutory right to workers’ compensation for myeloma that the WC Appeals Board determined arose out of his employment, the Court has jurisdiction to decide the date of injury for purposes of General Insurance’s contractual obligations.

B. General Reinsurance May Litigate a Change in Date of Injury

BART next contends that, even if the Court has jurisdiction to determine the date of injury, General Reinsurance is nonetheless barred from litigating it on the grounds of (1) issue preclusion, (2) equitable estoppel, (3) waiver, and (4) laches. Unfortunately for BART, none of these arguments succeeds.

1. Issue Preclusion Does Not Apply

BART’s issue preclusion argument hinges on workers’ compensation statutory sections pertaining to administrative and judicial review of matters within the WC Appeal Board’s exclusive jurisdiction. Specifically, Labor Code Section 5804 provides that “[n]o award of compensation shall be rescinded, altered, or amended after five years from the date of the injury except upon a petition by a party in interest filed within such five years and any counterpetition seeking other relief filed by the adverse party within 30 days of the original petition raising issues in addition to those raised by such original petition.” BART contends that General Reinsurance, as a “party in interest,” “could have submitted a petition for relief under Section 5804, and having failed to do so, is bound to the WC Appeal Board’s date of injury determination due to claim preclusion.

As a preliminary matter, General Reinsurance is not seeking in this action (which, in any event, was filed by BART) to rescind, alter, or amend the award of compensation to Gonsolin. Thus, Section *1068 5804 simply does not apply. Apart from Section 5804, however, the Court interprets BART’s argument as being that because the “date- of injury” was actually litigated in the workers’ compensation proceedings, and General Reinsurance could have participated in those proceedings, its defense in this action is barred by issue preclusion. Not so.

“Collateral estoppel, or issue preclusion, precludes relitigation of issues argued and decided in prior proceedings.” Mycogen Corp. v. Monsanto Co., 28 Cal.4th 888, 896 , 123 Cal.Rptr.2d 432 , 51 P.3d 297 (2002) (internal quotation marks and citation omitted). “The doctrine applies only if the decision in the initial proceeding was final and on the merits and the issue sought to be precluded from relitigation is identical to that decided in the first action and was actually and necessarily litigated in that action.” Lucido v. Super Ct., 51 Cal.3d 335, 341 , 272 Cal.Rptr. 767 , 795 P.2d 1223 (1990). In addition, the party against whom preclusion is sought must be the same as, or in privity with, the party to the first action. Id. In other words, even where the second cause of action is not barred by claim preclusion, judgment in an earlier case can “operate[ ] as an estoppel or conclusive adjudication as to such issues in the second action as were actually litigated and determined in the first action” between the same parties. Branson v. Sun-Diamond Growers, 24 Cal.App.4th 327, 345 , 29 Cal.Rptr.2d 314 (1994) (citation omitted); see also Johnson v. City of Loma Linda, 24 Cal.4th 61, 78 , 99 Cal.Rptr.2d 316 , 5 P.3d 874 (2000) (listing the elements of collateral estoppel as “identity of issues, finality of the decision, and identity or privity of the party against whom estoppel is sought”); Segal v. AT & T Co., 606 F.2d 842, 845 (9th Cir.1979).

Issue preclusion may operate as a bar to litigation of an issue that was decided in an earlier administrative proceeding “if the agency, acting in a judicial capacity, resolved disputed issues of fact properly before it, in a proceeding in which the parties had an adequate opportunity to litigate the factual issues” and “where the time for seeking judicial review of the administrative decision through a petition for writ of mandate had expired without such review being sought.” Johnson, 24 Cal.4th at 78 , 99 Cal.Rptr.2d 316 , 5 P.3d 874 (citing People v. Sims, 32 Cal.3d 468, 484-86, 186 Cal.Rptr. 77 , 651 P.2d 321 (1982)).

Issue preclusion does not apply here because General Reinsurance was not in privity with BART in the workers’ compensation proceedings. To determine privity, “courts examine the practicalities of the situation and attempt to determine whether [the parties] are sufficiently close ... to afford application of the principles of preclusion.” Armstrong v. Armstrong, 15 Cal.3d 942, 951 , 126 Cal.Rptr. 805 , 544 P.2d 941 (1976) (internal quotation marks and citation omitted). Privity may be established by “a mutual or successive relationship to the same rights of property, or to such an identification in interest of one person with another as to represent the same legal rights.” Citizens for Open Access to Sand & Tide, Inc. v. Seadrift Ass’n, 60 Cal.App.4th 1053, 1069 , 71 Cal.Rptr.2d 77 (1998) (internal citations omitted). Privity “has also been expanded to refer to ... a relationship between the party to be estopped and the unsuccessful party in the prior litigation which is ‘sufficiently close’ so as to justify application” or preclusion. Id. at 1069-60 , 71 Cal.Rptr.2d 77 . Privity will be found where the two parties have a “sufficient commonality of interests.” Tahoe-Sierra Preservation Council, Inc. v. Tahoe Regional Planning Agency, 322 F.3d 1064, 1081 (9th Cir.2003) (citations omitted).

*1069 Here, the WC Appeals Board proceedings involved Gonsolin versus BART, while the instant action involves BART versus General Reinsurance. Plainly, General Reinsurance was not a party to the earlier proceedings. Nor does General Reinsurance have a sufficient commonality of interest with BART to find the two parties in privity. Indeed, instead of having an “identification in interest ... [so] as to represent the same legal rights[,]” Seadrift Ass’n, 60 Cal.App.4th at 1069 , 71 Cal.Rptr.2d 77 , BART and General Reinsurance had competing interests in the prior proceedings: it was in BART’s interest to settle the compensation claim with Gonsolin and trigger whatever excess policy had the lowest retention so that BART would pay as little as possible out of its own pockets; in contrast, it was in General Reinsurance’s interest to avoid indemnity altogether, regardless of whether the WC Appeals Board found Gonsolin’s claims compensable.

California courts have reached similar conclusions when it comes to co-insurers’ interests in underlying WC Appeals Board proceedings. For 'example, in Chartis Insurance v. WC Appeals Board, 75 Cal. Comp. Cases 891 , 2010 WL 3449230 (2010), a California Court of Appeal determined that an insurer and insured’s stipulated date of injury is not binding on a later contribution action between the two insurers, nor does claim preclusion bar the newly added insurer from litigating the date of injury in the later contribution action. The court emphasized that an earlier date of injury is not binding on later contribution proceedings in part because the non-elected defendants’ rights — ie., those insurance carriers not named in the initial workers’ compensation action — “are not fully represented in the original proceeding.” Id. at 893. Likewise, even in successive proceedings all before the WC Appeals Board, courts have held that liability findings premised on the WCJ’s findings of fact based on stipulations between the claimant and insured employer are not binding on subsequent contribution proceedings between insurers for the simple reason that the other insurers who were not named as defendants in the earlier proceedings were not fully represented in the WC Appeals Board proceedings. See, e.d., id. at 894, 2010 WL 3449230 ; Fremont Comp. Ins. Grp. v. WC Appeals Bd., 64 Cal. Comp. Cases 1400 , 1999 Cal. Wrk. Comp. LEXIS 5701, *3-4 (1999) (workers’ compensation insurers are free to relitigate date of injury determinations in contribution and insurance coverage arbitrations); Rex Club v. WC Appeals Bd., 53 Cal.App.4th 1465, 1472 , 62 Cal.Rptr.2d 393 (1997) (insurers are free to relitigate liability in contribution proceedings).

In its argument for issue preclusion, BART ignores the well-established requirements for privity — ie., a sufficient commonality of interest — and instead insists that issue preclusion will apply when three factors (protection against vexatious litigants; furtherance of finality where public interests are involved; and promotion of stability of adjudications of prior actions) favor its application. (Dkt. No. 35 at 26 (citing Lynch v. Glass, 44 Cal.App.3d 943, 947-48 , 119 Cal.Rptr. 139 (1975)).) But the Lynch court listed those factors as examples where issue preclusion had applied, and still noted that privity, at bottom, comes down to “whether a nonparty was ‘sufficiently close’ to an unsuccessful party in a prior action as to justify the application of collateral estoppel against the nonparty.” 44 Cal.App.3d at 948 , 119 Cal.Rptr. 139 (citations omitted). BART and General Reinsurance have no such sufficiently close relationship; if anything, their positions in the WC Appeals Board proceedings were antagonistic. Accordingly, issue preclusion does not bar General Reinsurance from litigating the date of injury.

*1070 BART’s arguments to the contrary are unpersuasive. First, its argument is premised on its misplaced insistence that General Reinsurance was subject to mandatory administrative exhaustion of the WC Appeal Board’s decision under Section 5804. But the Court already rejected this argument. Moreover, the eases on which BART relies miss the mark. Ford v. Providence Washington Insurance Co., 151 Cal.App.2d 431 , 311 P.2d 930 (1957), merely holds that “an insurer who has had an opportunity to defend is bound by the judgment against its insured as to all issues which were litigated in the action against the insured.” Id. at 436 , 311 P.2d 930 . But General Reinsurance, as BART’s excess insurer, had no obligation to defend BART against Gonsolin’s claim. Ford is simply inapplicable. Clemmer v. Hartford Insurance Company, 22 Cal.3d 865, 872, 886 , 151 Cal.Rptr. 285 , 587 P.2d 1098 (1978), is inapplicable for the same reason. It, too, involves an insurer who had the opportunity to defend its insured but chose not to do so. Id. at 886 , 151 Cal.Rptr. 285 , 587 P.2d 1098 . Notably, in both cases each insurer was in privity with its insured: each had the exact same interest in defending the claim against the insured. Here, such privity is plaining lacking. As General Reinsurance was not in privity with BART, claim preclusion does not bar litigation of the date of injury in the context of this breach of contract suit.

2. General Reinsurance is not Equitably Estopped from Litigating the Date of Injury

BART next asserts that General Reinsurance should be equitably es-topped from litigating the date of injury. The doctrine of equitable estoppel, also known as promissory estoppel, “is founded on concepts of equity and fair dealing. It provides that a person may not deny the existence of a state of facts if he intentionally led another to believe a particular circumstance to be true and to rely upon such belief to his detriment.” City of Goleta v. Super. Ct., 40 Cal.4th 270, 279 , 52 Cal.Rptr.3d 114 , 147 P.3d 1037 (2006) (internal quotation marks and citation omitted). The elements of equitable estoppel are: “(1) the party to be estopped must be apprised of the facts; (2) he must intend that his conduct shall be acted upon, or must so act that the party asserting the estoppel has a right to believe it was so intended; (3) the other party must be ignorant of the true state of facts; and (4) he must rely upon the conduct to his injury.” People v. Castillo, 49 Cal.4th 145 , 155 n. 10, 109 Cal.Rptr.3d 346 , 230 P.3d 1132 (2010) (citations omitted). “One aspect of equitable estoppel!,]” and the particular brand that BART advances, “is codified in Evidence Code section 623, which provides that whenever a party has, by his own statement or conduct, intentionally and deliberately led another to believe a particular thing true and to act upon such belief, he is not, in any litigation arising out of such statement or conduct, permitted to contradict it.” Superior Dispatch, Inc. v. Ins. Corp. of N.Y., 181 Cal.App.4th 175, 186-87 , 104 Cal.Rptr.3d 508 (2010) (alterations and citations omitted); see also Strong v. Cnty. of Santa Cruz, 15 Cal.3d 720, 725 , 125 Cal.Rptr. 896 , 543 P.2d 264 (1975) (noting that the doctrine of equitable estoppel “provides that a person may not deny the existence of a state of facts if he intentionally led another to believe a particular circumstance to be true and to rely upon such a belief to his detriment”). The existence of estoppel is a question of fact, Gen. Motors Acceptance Corp. v. Gilbert, 196 Cal.App.2d 732, 742 , 17 Cal.Rptr. 35 (1961), and the party asserting estoppel bears the burden of proving it, see Domarad v. Fisher & Burke, Inc., 270 Cal.App.2d 543, 556 , 76 Cal.Rptr. 529 (1969).

*1071 In insurance disputes, “the doctrines of implied waiver and of estoppel, based upon the conduct or action of the insurer,, are not available to bring within the coverage of a policy risks not covered by its terms, or risks expressly excluded therefrom.” Supervalu, Inc. v. Wexford Underwriting Mgrs., Inc., 175 Cal.App.4th 64, 77 , 96 Cal.Rptr.3d 316 (2009). Thus, to the extent that the date of injury falls outside General Reinsurance’s excess coverage policy, BART cannot use equitable estoppel to find that it does. For this reason, alone, estoppel does not apply.

Even if such affirmative equitable estoppel usage was permitted, BART cannot not avail itself of the doctrine here. The first element of equitable estoppel requires that the party to be estopped is apprised of the facts — i.e., has knowledge of the facts. Castillo, 49 Cal.4th at 155 n. 10, 109 Cal.Rptr.3d 346 , 230 P.3d 1132 . Conversely, there can be no equitable estoppel where the party asserting equitable estoppel misrepresents the true facts, such that the party to be estopped was not apprised of the true facts. See, e.g., Stokes v. Bd. of Permit Appeals, 52 Cal.App.4th 1348, 1357 , 61 Cal.Rptr.2d 181 (1997) (rejecting plaintiffs argument that defendant should be estopped from revoking building permits where the plaintiff misrepresented true facts about the use of the property). However, “negligence satisfies the element of knowledge.” Green v. MacAdam, 175 Cal.App.2d 481, 487 , 346 P.2d 474 (1959) (citation omitted).

This is the element to which the parties devote the most significant attention, disputing whether General Reinsurance possessed sufficient information about Gonsolin’s employment and Dr. Cay-ton’s medical opinion to understand that the October 1991 date of injury was stipulated to based on Gonsolin’s employment with BART through 2005 and Dr. Cayton’s 15-year latency determination. By March of 2008 General Reinsurance had received documents that clearly indicated that Gonsolin worked at BART through 2005. (See, e.g., Dkt. No. 34-31 at 1 (noting that Gonsolin “sustained multiple myeloma/cancer as a result of his cumulative exposure to carcinogens through October 13, 2006”); id. at 8 (“Mr. Gonsolin has worked as a police officer for BART from 1979 until September 11, 2005.”).) Likewise, the documents received in March also reflect the parties’ stipulation and the WC Appeal Board’s acceptance of the parties’ agreement that Gonsolin’s myeloma had a 15-year latency period. (Dkt. No. 34-31 at 2 (quoting the WC Appeal Board’s decision as noting that “[h]aving considered the reports of Dr. Cayton, I find that the latency period for Mr. Gonsolin’s myeloma is 15 years. Therefore, looking back from the date of diagnosis in 2006, I am persuaded that Dr. Cayton is correct in setting forth the exposures prior to 1991 as being injurious causing the injury herein.”).) By October of 2008, General Reinsurance received even more documents that reflected Gonsolin’s 2005 retirement, his 2006 date of diagnosis, and the 15-year latency period stipulation. (See, e.g., Dkt. No. 34-37 at 41.) 5 General Reinsurance had also. received Dr. Cayton’s deposition testimony, which reflected his earlier statement that the average latency period for myeloma was between 8 and 12 years. (See Dkt. No. 34-37 at 15.) The Court thus finds that the first estoppel element is satisfied. That General Reinsurance perhaps did not fully assess the documents before it does not preclude equitable estoppel, but rather suggests that General Reinsurance was negligent in reviewing *1072 the information before it. See Green, 175 Cal.App.2d at 487 , 346 P.2d 474 .

The second element is that the party to be estopped had an intent that his conduct would be acted upon. Castillo, 49 Cal.4th at 155 n. 10, 109 Cal.Rptr.3d 346 , 230 P.3d 1132 . “The defendant need not intend to deceive the plaintiff to give rise to an equitable estoppel.” Superior Dispatch, Inc., 181 Cal.App.3d at 186, 226 Cal.Rptr. 840 (citation omitted); see also Domarad, 270 Cal.App.2d at 555 , 76 Cal.Rptr. 529 (“Negligence that is careless and culpable conduct is, as a matter of law, equivalent to an intent to deceive and will satisfy the element of fraud necessary to an estoppel.” (internal quotation marks and citations omitted)). Rather, “[t]o create an equitable estoppel, it is enough if the party has been induced to refrain from using such means or taking such action as lay in his power, by which he might have retrieved his position and saved himself from loss.” Id. (internal quotation marks and citation omitted). Here, when General Reinsurance actually reimbursed BART three times for the compensation BART paid Gonsolin above and beyond BART’s retention, General Reinsurance induced BART to believe that General Reinsurance would not be challenging the date of injury determination and its coverage. BART relied on General Reinsurance not challenging the date of injury and its coverage by not pursuing another excess coverage insurer. Thus, the Court finds that the element of intent is satisfied.

The third element of estoppel is that the party asserting estoppel is ignorant of the true facts. Castillo, 49 Cal.4th at 155 n. 10, 109 Cal.Rptr.3d 346 , 230 P.3d 1132 . This element requires that the party as- . serting equitable estoppel not only lacked actual knowledge of the true facts, but also did not have notice of the facts sufficient to put a reasonably prudent person on inquiry notice. Life v. Cnty. of Los Angeles, 227 Cal.App.3d 894, 902 , 278 Cal.Rptr. 196 (1991). Here, this would mean that BART was ignorant of facts that give rise to the possibility that General Reinsurance might challenge the date of injury or deny coverage. This is where BART’s equitable estoppel argument fails. The Court finds that BART had knowledge that there was a dispute over the date of injury; indeed, the WC Appeal Board’s order approving the settlement even stated as much. (See Dkt. No. 34-27 at 5.) Moreover, prior to giving notice of the settlement to General Reinsurance, BART gave notice to a different excess insurer, Midwest, suggesting that Midwest would cover the excess compensation payments based on a later date of injury. (See Dkt. No. 34-25.)

Nor can BART show that it has been harmed by General Reinsurance’s conduct. BART can still report the claim to another excess coverage insurer, as late notice of a claim is not a defense to coverage absent prejudice. See Safeco Ins. Co. of Am. v. Parks, 170 Cal.App.4th 992, 1004 , 88 Cal.Rptr.3d 730 (2009). Thus, BART has not established that equitable estoppel bars General Reinsurance from litigating the date of injury now.

3. General Reinsurance Did Not Waive Challenge to the Date of Injury

Next, BART contends that General Reinsurance waived its right to litigate the date of injury issue because it failed to challenge the issue before the WC Appeals Board. Under California law, waiver is “the intentional relinquishment or abandonment of a known right.” Bickel v. City of Piedmont, 16 Cal.4th 1040, 1048 , 68 Cal.Rptr.2d 758 , 946 P.2d 427 (1997) (citations omitted), abrogated on other grounds by DeBerard Props, Ltd. v. Lim, 20 Cal.4th 659, 668 , 85 Cal.Rptr.2d 292 , 976 P.2d 843 (1999). Waiver is a question *1073 of fact, Bickel, 16 Cal.4th at 1052 , 68 Cal.Rptr.2d 758 , 946 P.2d 427 , and always is based upon the parties’ intent, Waller v. Truck Ins. Exch., Inc., 11 Cal.4th 1, 31 , 44 Cal.Rptr.2d 370 , 900 P.2d 619 (1995). The party claiming waiver must “prove it by clear and convincing evidence that does not leave the matter to speculation, and doubtful cases will be decided against a waiver.” Waller, 11 Cal.4th at 31 , 44 Cal. Rptr.2d 370 , 900 P.2d 619 (internal quotation marks and citations omitted). “The waiver may either be express, based on the words of the waiving party, or implied, based on conduct indicating an intent to relinquish the right.” Id. (citation omitted). In the insurance context in particular, California courts have applied a particularly high bar for demonstrating waiver, noting that denial of coverage on one ground does not impliedly waive denial on the basis of grounds not stated in the denial. See id. (citations omitted); see also State Farm Fire & Cas. Co. v. Jioras, 24 Cal.App.4th 1619 , 1628 n.7, 29 Cal.Rptr.2d 840 (1994). Further, just as with equitable estoppel, a party cannot use implied waiver to establish coverage where none exists. Supervalu, Inc., 175 Cal.App.4th at 77 , 96 Cal.Rptr.3d 316 . For this reason alone BART’s implied waiver argument fails.

Even if implied waiver were available, it does not apply. BART argues implied waiver based upon General Reinsurance’s failure to seek to rescind, alter or amend the WC Appeals Board’s award of compensation or to file a petition for relief to the WC Appeals Board pursuant to Labor Code Section 5804, and its failure to seek contribution pursuant to Labor Code Section 5500.5. The Court cannot infer General Reinsurance’s intent to waive a challenge to the date of injury determination from its failure to engage in an administrative challenge to the WC Appeal Board’s compensation award as it has already determined that General Reinsurance was not obligated to do so.

Thus, BART has failed to establish by clear and convincing evidence that BART intended to relinquish its right to challenge the date of injury determination and contest coverage.

4. Laches Does Not Bar General Reinsurance From Litigating the Date of Injury

Finally, laches does not bar General Reinsurance from litigating the date of injury. Laches is an equitable defense that bars a claim when there is “unreasonable delay plus either acquiescence in the act about which plaintiff complains or prejudice to the defendant resulting from the delay.” Johnson v. City of Loma Linda, 24 Cal.4th 61, 77 , 99 Cal.Rptr.2d 316 , 5 P.3d 874 (2000). Laches is “designed to promote justice by preventing surprises through the revival of claims that have been allowed to slumber until evidence has been lost, memories have faded, and witnesses have disappeared[J” Brown v. State Pers. Bd., 166 Cal.App.3d 1151, 1161 , 213 Cal.Rptr. 53 (1985). Any delay is measured from the time the plaintiff knew or should have known about the alleged claim. Magic Kitchen LLC v. Good Things Int’l Ltd., 153 Cal.App.4th 1144, 1157 , 63 Cal.Rptr.3d 713 (2007). “Prejudice is never presumed; rather it must be affirmatively demonstrated by the defendant in order to sustain his burdens of proof and the production of evidence on the issue.” Miller v. Eisenhower Med. Ctr., 27 Cal.3d 614, 624 , 166 Cal.Rptr. 826 , 614 P.2d 258 (1980). The prejudice may be factual in nature or compromise the presentation of the defense.” Drake v. Pinkham, 217 Cal.App.4th 400, 406 , 158 Cal.Rptr.3d 115 (2013) (citation omitted). Put another way, “[c]ourts have recognized two chief forms of prejudice in the laches *1074 context — evidentiary and expectations-based.” Danjaq LLC v. Sony Corp., 263 F.3d 942, 955 (9th Cir.2001) (citation omitted). Evidentiary prejudice “includes such things as lost, stale, or degraded evidence, or witnesses whose memories have faded or who have died.” Id. Expectations-based prejudice occurs when a party “show[s] that it took actions or suffered consequences that it would not have, had the plaintiff brought suit properly.” Id. (citation omitted).

Normally, laches applies to bar a particular cause of action from moving forward; not to bar a particular defense. See Miller, 27 Cal.3d at 624 , 166 Cal.Rptr. 826 , 614 P.2d 258 (noting that the “affirmative defense of laches requires unreasonable delay in bringing suit ” (emphasis added)). But here, BART contends that laches bars General Reinsurance from asserting in this breach of contract action that BART brought a date of injury different from the WC Appeal Board’s date of injury determination. The Court finds that laches does not apply to this situation. Laches here is just another way of arguing equitable estoppel, an issue the Court has already rejected.

ifs * *

BART has failed to establish that any legal doctrine bars General Reinsurance from litigating the date of injury in the context of this breach of contract dispute. General Reinsurance was not obligated to seek to change the date of injury determined in the WC Appeals Board proceedings, and its failure to do so does not preclude it from litigating that issue now. To be sure, a date of injury determination in this action may be inconsistent with the stipulated date of injury accepted in the WC Appeals Board proceedings, but an inconsistent determination will not disturb Gonsolin’s statutorily-owed compensation. Moreover, the Court’s finding does not mean an excess insurer will never be bound by findings of fact made in workers’ compensation proceedings. An employer may seek to join its excess insurer to a workers’ compensation proceeding. See Millman, 79 Cal. Comp. Cases at 439; St. Jude Joinder Case, 65 Cal. Comp. Cases at 1444. If it successfully does so, the excess insurer may be prohibited by issue preclusion from litigating in a subsequent coverage dispute with its insured issues decided in the workers’ compensation action. But General Reinsurance was not joined, or even sought to be joined, to the workers’ compensation proceedings here. Thus, it is not bound by the WC Appeals Board finding of date of injury.

CONCLUSION

For the reasons described above, the Court concludes that it has jurisdiction to make a factual determination regarding the date of injury in the context of this breach of contract suit and that General Reinsurance is entitled to litigate the date of injury. This Order constitutes the findings of fact and conclusions of law required by Federal Rule of Civil Procedure 52(a)(1).

Because the Court has answered the Phase One questions in General Reinsurance’s favor, this matter shall proceed to Phase Two, in which the parties may actually litigate the date of injury and the Court will make a final coverage determination. The parties shall submit by July 8, 2015, a proposed schedule for Phase Two, including deadlines for the exchange of medical expert reports and a suggested date for the one-day bench trial.

IT IS SO ORDERED.

. The following facts are taken from the parties’ Stipulated Facts (Dkt. No. 29), the Exhibits attached thereto (Dkt. No. 34), and the docket of this case.

. Page numbers herein refer to those that the Court’s electronic case filing system automatically assigns.

.Benzene is “a component of products derived from coal and petroleum and is found in gasoline and other fuels.” Benzene, Occupational Safety & Health Admin., available at https://www.osha.gov/SLTC/benzene/ (last visited June 24, 2015).

. The WC Appeals Board designated Millman a "significant panel decision.” Although such decisions are citable authority, they are not binding precedent, but are deemed persuasive by the WC Appeals Board. See Guitron v. Santa Fe Extruders, WCAB No. ADJ163338, 76 Cal. Comp. Cases 228 n. 7, 2010 WL 6098653 (2011). The WC Appeals Board’s decisions, and summaries thereof, are authority "to the extent that they point out the contemporaneous interpretation and application of the workers' compensation laws by the [WC Appeals Board].” Victor Valley Transit Auth. v. WC Appeals Bd., 83 Cal.App.4th 1068 , 1075 n. 9, 100 Cal.Rptr.2d 235 (2000) (citation omitted).

. For a comprehensive list of the fifteen different documents that General Reinsurance possessed by October 2008 referring to the 2006 date of injury and 2005 date of retirement, see Docket No. 40 at 14.