Cottonwood Environmental Law Center v. Edwards

District Court, D. Montana·Decided September 5, 2025·No. 2:20-cv-00028·Unknown

Opinion

IN THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF MONTANA BUTTE DIVISION

COTTONWOOD ENVIRONMENTAL LAW CV-20-28-BU-BMM CENTER,

Plaintiff,

ORDER v.

BIG SKY WATER AND SEWER DISTRICT; BOYNE USA, INC.,

Defendants.

Defendant Boyne USA, Inc. (“Boyne”) has filed three motions to exclude Cottonwood Environmental Law Center’s (“Cottonwood”) untimely expert opinions. (Docs. 252, 270, and 285.) The Court held a hearing on the motion on August 28, 2025. (Doc. 291.) The Court denies the three motions. BACKGROUND Cottonwood filed suit against Big Sky Water and Sewer District No. 363, alleging pollution of the Gallatin River in violation of the Clean Water Act on July 10, 2020. (Doc. 1.) The Court granted Cottonwood leave to amend its complaint to add Boyne as a party on December 17, 2021. (Doc. 89 at 8–10.) After Cottonwood 1 filed its amendment, the Court divided the action to address Cottonwood’s claims against each party separately. (Doc. 118.)

The Court initially entered a scheduling order in this case on October 28, 2020. (Doc. 17.) The Court issued a new scheduling order on May 8, 2024, that reset the disclosure and trial dates for Cottonwood’s claims against Boyne. (Doc. 234.)

Pursuant to that order, the parties were to disclose liability and damage experts with Rule 26(a)(2) reports on or before October 15, 2024. (Id. at 1–2.) The scheduling order also required all parties to disclose rebuttal experts and reports by December 15, 2024. (Id. at 2.) Discovery closed on March 31, 2025. (Id.) The scheduling order

advised that “[i]nitial reports or depositions of experts determined to be inaccurate, or incomplete shall be corrected or completed by supplemental disclosure no later than 90 days before trial.” (Id. at ¶ 9.)

Dr. Glibert submitted an initial expert report on October 14, 2024, and a rebuttal report on December 16, 2024. These reports contain Dr. Glibert’s opinions regarding the potential source of nitrogen pollution in the West Fork region of the Gallatin River. (Doc. 253, Exhibit 3 at 6 and Exhibit 4 at 2). The reports do not

mention chloride as a tracer of pollution. (Id.) Dr. Glibert first provided an opinion regarding the chloride concentration of the water in the region in her deposition on March 14, 2025. (Glibert Dep. at 79:16–23 and 85:1–20). Cottonwood later

disclosed a third technical report from Dr. Glibert on May 8, 2025. (Doc. 253, 2 Exhibit 2.) The technical report uses chloride datasets gathered from the Gallatin Local Water Quality District. (Doc. 253, Exhibit 2 at 2.) Dr. Glibert asserts in the

technical report that “[c]hloride . . . is a useful tracer of reclaimed wastewater.” (Id.) Boyne promptly filed its motion to exclude Dr. Glibert’s supplemental report on May 19, 2025. (Doc. 252.) Cottonwood filed its response on June 2, 2025. (Doc.

256.) The Court did not conduct a hearing on the motion until August 28, 2025. (Doc. 291.) Cottonwood later disclosed to Boyne’s counsel through email, on July 22, 2025, that its expert, Barry Dutton, may refer in his trial testimony to a 2006 EPA

Process Design Manual on Land Treatment of Municipal Wastewater Effluents (“2006 EPA report”). (Doc. 271, Exhibit 1.) Cottonwood requested a visit to inspect Boyne’s golf course on February 27, 2025, for more testing and investigations. (Doc.

286 at 2.) Boyne initially refused to allow Cottonwood to visit the site. (Id.) Boyne later agreed to allow Cottonwood a “one day, no sampling site visit.” (Id.) The parties agreed upon terms for this site visit that were set forth in the Site Access Agreement. (Doc. 289, Exhibit 1.) Cottonwood and Boyne agreed to exchange

copies of photographs and reports generated from the site visit in the Site Access Agreement by a deadline of August 20, 2025. (Id.) Cottonwood’s experts, Trevor Osorno and Dutton were present at the site visit

conducted on August 13, 2025. (Doc. 289 at 2.) Both Osorno and Dutton prepared 3 reports based on the site visit. Cottonwood produced Osorno’s and Dutton’s expert reports to Boyne on the Site Access Agreement deadline of August 20, 2025. (Doc.

285 at 2.) Osorno’s and Dutton’s new reports include information related to the positioning of lysimeters on the golf course. Osorno and Dutton seek to testify at trial regarding the positioning of the lysimeters.

LEGAL STANDARD Rule 26(a)(2)(A) of the Federal Rules of Civil Procedure requires a party to disclose the identity of any witness that the party plans to use at trial to present expert testimony. The expert disclosure “must be accompanied by a written report” that contains “a complete statement of all opinions the witness will express.” Fed. R. Civ.

P. 26(a)(2)(B). Parties must make disclosures “at the times and in the sequence that the court orders.” Fed. R. Civ. P. 26(a)(2)(D).

Parties must supplement or correct their disclosures “in a timely manner if the party learns that in some material respect the disclosure or response is incomplete or incorrect, and if the additional or corrective information has not otherwise been made known to the other parties during the discovery process or in writing.” Fed. R.

Civ. P. 26(e)(1)(A). Parties must disclose “any additions or changes to this information” before “pretrial disclosures under Rule 26(a)(3) are due.” Id. Pursuant to Rule 26(a)(3), parties must disclose “at least 30 days before trial” unless otherwise

ordered by the court. 4 “Rule 37(c)(1) gives teeth to these requirements by forbidding the use at trial of any information required to be disclosed by Rule 26(a) that is not properly

disclosed.” Yeti by Molly, Ltd. v. Deckers Outdoor Corp., 259 F.3d 1101, 1106 (9th Cir. 2001). Rule 37(c)(1) also authorizes the Court to impose other appropriate sanctions such as the payment of reasonable expenses “[i]n addition to or instead of”

excluding the evidence. Fed. R. Civ. P. 37(c)(1); see also Plentyhawk v. Sheikh, CV 14-44-BLG-SPW, 2016 U.S. Dist. LEXIS 70815, at *11 (D. Mont. May 31, 2016). DISCUSSION Boyne asks the Court to exclude all expert reports and opinions disclosed

after the discovery deadline. (Docs. 252, 270, and 285.) Specifically, Boyne seeks to exclude the technical report created by Dr. Glibert, the testimony of Barry Dutton referencing the 2006 EPA report, and the expert site visit reports created by

Trevor Osorno and Barry Dutton. (Docs. 252, 270, and 285.) Boyne has requested that the Court exclude Cottonwood’s expert reports and Dutton’s testimony as a sanction for Cottonwood’s untimely disclosure.

“The party facing sanctions bears the burden of proving that its failure to disclose the required information was substantially justified or is harmless.” R & R Sails, Inc. v. Ins. Co. of the Pa., 673 F.3d 1240, 1246 (9th Cir. 2012) (citing Torres

v.City of L.A., 548 F.3d 1197, 1213 (9th Cir. 2008)). The Court employs “a five- 5 factor test to determine whether a sanction proves appropriate: 1) the public’s interest in expeditious resolution of litigation; 2) the court’s need to manage its

docket; 3) the risk of prejudice to the defendants; 4) the public policy favoring disposition of cases on their merits; 5) the availability of less drastic sanctions.” Wendt v. Host Int’l, Inc., 125 F.3d 806, 814 (9th Cir. 1997).

I. Boyne’s Motion to Exclude the Technical Report of Dr.

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