Orange Cnty. Water Dist. v. MAG Aerospace Indus., Inc., 12 Cal. App. 5th 229

Background

Orange County Water District (District) sued MAG and others over PCE/TCE contamination allegedly affecting groundwater beneath a Fullerton industrial site (Valencia site), asserting claims under the HSAA, the OCWD Act, and common‑law torts, plus declaratory relief.
The trial court bifurcated proceedings, holding a bench trial first on equitable/statutory claims (HSAA, OCWD Act, declaratory relief) and later planning a jury trial on legal tort claims; District objected to sequencing.
After the District presented its case at the bench trial, MAG moved under Code Civ. Proc. § 631.8; the court granted judgment for MAG on HSAA, OCWD Act, and declaratory counts, finding no credible evidence that PCE in shallow soil migrated to groundwater and that groundwater contamination came from offsite sources.
MAG then moved for summary adjudication of the District’s negligence, nuisance, and trespass claims; the court treated its prior factual findings as binding and granted summary adjudication, leading to judgment for MAG including a declaration of no liability for past or future costs.
On appeal the District argued (1) improper legal standard on HSAA causation, (2) denial of jury trial right by trying equity first, (3) improper declaratory ruling for MAG though MAG did not request it, and (4) improper reliance on Evidence Code § 412 to discount District experts.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
1. Whether court erred in granting judgment under CCP §631.8 on HSAA claim by applying wrong causation standard	District: court required proof that MAG specifically caused the release that produced response costs; HSAA requires only that a release at the site caused response costs, not that MAG caused that release	MAG: irrespective of label, court’s factual findings show no release from site caused groundwater contamination or District’s response costs, so judgment proper	Affirmed. Any misstatement of law about defendant‑specific causation was harmless because court’s unchallenged findings foreclosed HSAA recovery under correct standard
2. Whether sequencing equitable bench trial before jury on legal claims violated District’s jury right (CCP §1048)	District: trying equity first risked extinguishing jury trial rights and deprived jury of deciding factual issues	MAG: equity‑first scheduling is permissible; bench findings can preclude or narrow jury issues and conserve resources	Affirmed. Court did not abuse discretion; follows long‑standing ‘‘equity first’’ rule (Raedeke) and record shows District preserved objection
3. Whether court could declare MAG had no liability for future costs though MAG did not seek that relief	District: declaratory relief in MAG’s favor improper because MAG never requested it	MAG: when plaintiff seeks declaratory relief but fails to prove entitlement, court may render an unfavorable declaration	Affirmed. Court properly entered express adverse declaratory judgment; District’s contrary argument waived on appeal
4. Whether court improperly applied Evidence Code §412 to discount District expert and thereby prejudiced outcome	District: invocation of §412 (weaker evidence offered when stronger existed) unduly discredited expert, causing prejudice	MAG: even without §412 the substantial evidentiary record supported court’s adverse credibility findings and closed pathway to groundwater; no reasonable probability of different result	Affirmed. Even assuming error, District failed to show prejudice given other credible evidence and closure determinations

Key Cases Cited

Carson Harbor Village, Ltd. v. Unocal Corp., 270 F.3d 863 (en banc 9th Cir.) (elements of CERCLA private cost‑recovery claim)
Kinney v. Overton, 153 Cal.App.4th 482 (Cal. Ct. App.) (motion for judgment under §631.8 permits court to weigh evidence and resolve credibility)
Medrazo v. Honda of North Hollywood, 205 Cal.App.4th 1 (Cal. Ct. App.) (bench‑trial judgment standard and credibility determinations)
Raedeke v. Gibraltar Savings & Loan Assn., 10 Cal.3d 665 (Cal. 1974) (equity‑first rule: trial court may try equitable issues first)
United States v. Alcan Aluminum Corp., 964 F.2d 252 (3d Cir.) (CERCLA plaintiffs need not show defendant specifically caused the release that led to response costs)
Monsanto Co. v. United States, 858 F.2d 160 (4th Cir.) (analysis of generator liability under CERCLA)
Asarco LLC v. NL Industries, Inc., 106 F.Supp.3d 1015 (E.D. Mo.) (tracing defendant’s specific waste not required to link costs to a release; response costs must be caused by an actual or threatened release)
Shore Realty Corp. v. State of N.Y., 759 F.2d 1032 (2d Cir.) (CERCLA causation decisions rejecting requirement that plaintiff show defendant caused release)
Artesian Water Co. v. Government of New Castle County, 659 F.Supp. 1269 (D. Del.) (CERCLA requires causal link between release and incurrence of costs; traditional causation principles apply to that element)