1

Filed 9/12/13 Murphy v. Matas CA1/2

NOT TO BE PUBLISHED IN OFFICIAL REPORTS

California Rules of Court, rule 8.1115(a), prohibits courts and parties from citing or relying on opinions not certified for 

publication or ordered published, except as specified by rule 8.1115(b). This opinion has not been certified for publication

or ordered published for purposes of rule 8.1115. 

IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA

FIRST APPELLATE DISTRICT

DIVISION TWO

LYNETTE MURPHY,

Plaintiff and Appellant,

v.

DAVID MATAS et al.,

Defendants and Respondents.

 A135758

 (Alameda County Super. Ct.

 No. HG11568014)

ORDER MODIFYING OPINION

[NO CHANGE IN JUDGMENT]

THE COURT:

It is ordered that the opinion filed herein on August 23, 2013, be modified as 

follows:

On page 12, in the last sentence of the first full paragraph, replace the last word 

“boat” with “tube.” The sentence is thereby modified to read:

In support of this, she cites the speed of the boat, the fact that other people 

complained of injuries, and the fact that one child was thrown from the tube.

On page 12, the first sentence of the second full paragraph is also modified to 

read:

None of Murphy’s evidence creates a triable issue regarding whether Matas 

intended to throw people from the tube.
2

On page 15, the following sentence of the last paragraph is modified to read:

Indeed, Murphy presented the contents of the manuals in support of her opposition 

to the summary judgment motions.

The petition for rehearing is denied.

 Kline, P.J.
1

Filed 8/23/13 Murphy v. Matas CA1/2 (unmodified version)

NOT TO BE PUBLISHED IN OFFICIAL REPORTS

California Rules of Court, rule 8.1115(a), prohibits courts and parties from citing or relying on opinions not certified for 

publication or ordered published, except as specified by rule 8.1115(b). This opinion has not been certified for publication 

or ordered published for purposes of rule 8.1115. 

IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA

FIRST APPELLATE DISTRICT

DIVISION TWO

LYNETTE MURPHY,

Plaintiff and Appellant,

v.

DAVID MATAS et al.,

Defendants and Respondents.

 A135758

 (Alameda County 

 Super. Ct. No. HG11568014)

Lynnete Murphy was injured while riding in an inflatable raft or tube while being 

towed behind a motorboat driven by David Matas, a pastor at Cornerstone Fellowship of 

Livermore, California (Cornerstone). Steve Viss owned the motorboat and tube. Murphy 

sued Matas and Cornerstone for negligence and Viss and Cornerstone for negligent 

entrustment.1 The trial court concluded that both of Murphy’s claims were subject to the 

defense of primary assumption of risk and granted summary judgment against Murphy’s 

claims. Murphy appeals and asserts that primary assumption of risk does not bar her 

claims. We affirm the judgment. 

BACKGROUND

On August 15, 2010, Murphy, her husband, and two stepchildren attended a 

recreational event, Cornerstone Fellowship Singles Ministry Water Day Event, organized 

and promoted by Matas and Cornerstone. The event was at Lake Hogan in Valley 

 

1 Murphy also sued another individual for negligent entrustment but he was, 

subsequently, dismissed as a defendant. 
2

Springs, California. The recreational activity of tubing was offered at the event. Tubing, 

according to Viss, “is a water activity in which individuals ride on an inflatable raft, such 

as the ski tube, while it is being towed by a motorboat.” 

Matas borrowed a motorboat and a Sea-Doo Triangle Towable Ski Tube (Sea-Doo 

tube or raft) that were owned by Viss for the church event. Viss did not attend. Matas 

operated the motorboat and towed the Sea-Doo tube, which accommodated three persons. 

During one of the rides, Murphy’s husband and two stepchildren rode in the motorboat 

with Matas and Murphy, a child, and another adult rode in the tube. Murphy was not 

ejected from the tube during her ride. After Murphy rode in the tube, her husband and 

her stepson rode in the tube; Murphy took a video of them. 

On March 28, 2011, Murphy filed a complaint for negligence against Matas and 

Cornerstone and for negligent entrustment against Cornerstone, Viss, and Paul Schaffer. 

Murphy alleged that Viss and Schaffer jointly owned the motorboat driven by Matas. 

She alleged that Matas operated the “motorboat at excessive speed, and caus[ed] the 

motorboat and those being towed in the inflatable raft to make sharp ‘S’ turns . . . .” She 

claimed that Matas operated the motorboat seven to eight miles per hour over the 

recommended speed limit for the tube. She asserted that Matas’s improper operation of 

the boat resulted in the inflatable raft’s crossing a wake, and caused the raft to be thrown 

up in the air from the surface of the water. She claimed that the raft then landed “with 

great force on the water’s surface[.]” Murphy maintained that she severely injured her 

back as she suffered a compression fracture of one of her lumber vertebrae and damage to 

her intervertebral discs at various places throughout her spine. As a result, Murphy had 

to have back surgery to repair the fracture to her lumbar vertebra. 

Matas and Cornerstone2 moved for summary judgment and Viss separately moved 

for summary judgment; Murphy opposed both motions. Murphy did not dispute that Viss 

was the sole owner of both the Sea-Doo tube and motorboat and that Schaffer did not 

own the motorboat. The motions for summary judgment were based on the argument that 

 

2 This summary judgment motion was also filed on behalf of Schaffer but he was 

dismissed as a defendant on December 8, 2011. 
3

the primary assumption of risk defense completely barred Murphy’s negligence and 

negligent entrustment claims.

Defendant filed two declarations in support of the motions for summary judgment. 

Schaffer declared that he had substantial experience with tubing as both a tube rider and 

boat operator since 1993. He declared that “[t]ubing on a lake typically involves pulling 

passengers on a tube, at a relatively high rate of speed.” He asserted: “In my experience, 

tube riders engage in the activity of tubing in order to experience the thrill of whipping 

across the water at speeds [that] challenge their ability to stay on the tube. During tubing, 

it is typical for the driver of the boat to make sharp turns, which cause the tube to travel 

over the boat’s wake at an increased speed. This often causes the tube to become 

airborne, which is intended [to] increase the thrill of the ride because it increases the 

chance that they will fall off the tube. During tubing, riders often fall off the tube.” 

Similarly, Viss declared that he had substantial experience with tubing as both a 

tube rider and a boat operator and that “[t]ubing on a lake typically involves pulling 

passengers on the ski tube at a relatively high rate of speed with the intended purpose of 

challenging the riders’ ability to remain in or on the tube through quick and sometimes 

sharp turns of the boat causing the tube to increase in speed and travel over the boat’s 

wake. When a tube crosses the wake of a boat, the tube and its riders experience a 

turbulence effect[,] which further increases the physical challenge of remaining in the 

tube because the riders are jostled about, sometimes violently. This frequently causes the 

tube to become airborne, which is typically viewed by tube riders to add to the thrill of 

the ride because of the increased physical challenge and the increased risk of falling off 

the tube. Tubing rides typically end when a rider falls off the tube.”

In opposition to the motions for summary judgment, Murphy presented Matas’s 

deposition testimony. Matas stated that he had driven a motorboat that towed passengers 

in a tube hundreds of times and that he had operated the motorboat in a manner designed 

to eject passengers from the tube but that was not his normal manner of operating. He 

explained that a person wanting a ride with a greater thrill could use a device that permits 

the person “to roll off” more easily but that he would give that type of ride only if it were 
4

safe and desired by the rider. The tube he used when Murphy was riding was not 

designed for people to fall off of it. He acknowledged knowing that Murphy had been in 

the hospital just prior to the event; he had told her that maybe she should not participate 

in tubing. He admitted that another person also claimed a sore neck as a result of riding 

in the tube towed by him and that person had reported to him that she believed he had 

gone too fast. He noted five other people commented that they were sore as a result of 

the tube ride. Another person at the event was towing a tube with riders and Matas was 

not aware of anyone in that tube being injured. 

Murphy also submitted Viss’s deposition testimony. Viss testified that the SeaDoo tube had a warning label on the side of the tube regarding the maximum speed for 

towing. He believed the speed limit stated was 20 miles per hour for adults and 15 miles 

per hour when towing children. 

According to Murphy’s husband, Matas stated at one point during Murphy’s ride 

that the “motorboat was going” “ ‘27 miles per hour.’ ”3 When Matas disclosed this, he 

was, according to Murphy’s husband, making very sharp turns, and at one point the tube 

hit the motorboat’s wake and the tube became airborne. Murphy’s husband added that 

Matas drove the motorboat in a similar fashion while he was tubing and one of the 

children in the tube with him was ejected. 

Brad P. Avrit, a civil engineer and Murphy’s expert in safety engineering, 

provided a declaration. He stated that Matas “was apparently engaged in a series of turns 

(‘S’ turns), causing the subject raft to be accelerated laterally, making impact with the 

wake of the subject motorboat . . . , which . . . would be considered ‘hot-dogging,’ and 

with the intent of trying to eject passengers from the tube into the water.” He added that 

the speed of the raft at the time that it impacted the motorboat wake would have been 

significantly greater than the speed of the boat, which was, according to Murphy’s 

 

3 Matas denied telling Murphy’s husband that he had been going 27 miles per 

hour. He testified that the maximum speed he reached during Murphy’s ride was 18 

miles per hour. 
5

husband, 27 or 28 miles per hour. He estimated that the tube would have been traveling 

34 to 42 miles per hour. 

The manual and safety instructions for the motorboat owned by Viss provided as 

follows: “Use of this product and participation in the sport involves inherent risks of 

injury or death.” It also specified that the “[t]ow vehicle driver is RESPONSIBLE for the 

rider on the tube since the tube cannot be controlled by the rider, and since the rider’s 

vision can be impaired by the spray from the tube.” It also instructed that the “[t]ow 

vehicle driver should AVOID excessive speed or sharp turns, because the tube will 

accelerate and arc around corners, which might cause the tube to flip over abruptly, 

resulting in serious injury or death to the rider(s).” The manual warned that if the boat’s 

speed is 20 miles per hour, the towable speed could be 30 to 50 miles per hour and that 

the towable speed increases when the boat makes a turn of 90 to 180 degrees. 

When Viss replied to Murphy’s opposition to his motion for summary judgment, 

he attached a supplemental declaration of his counsel and attached evidentiary materials, 

including pictures of Murphy while she was riding on the tube. These photographs 

included captions that indicated Murphy was having fun. Murphy objected to this 

evidence, and claimed that the captions were from a website and had been altered by 

someone other than Murphy. 

The trial court granted the motions for summary judgment by Matas, Cornerstone, 

and Viss. The court ruled that the primary assumption of risk doctrine was a complete 

defense to Murphy’s negligence claim against Matas and Cornerstone under Record v. 

Reason (1999) 73 Cal.App.4th 472 (Record). The court found that the claim of negligent 

entrustment against Cornerstone failed because Cornerstone did not own the motorboat. 

Additionally, since the court had determined that Matas and Cornerstone had no duty to 

Murphy, and Viss’s liability was derivative, Murphy’s claim for negligent entrustment 

against Viss also failed. Both Murphy and the defendants had raised objections to 

evidence and the court overruled all of the objections. 
6

Murphy moved for a new trial, which the court denied. On June 15, 2012, 

Murphy filed a notice of appeal from the judgment in favor of Viss and from the 

judgment in favor of Matas and Cornerstone. 

DISCUSSION

I. Standard of Review

We review a trial court’s grant of summary judgment de novo. (Dore v. Arnold 

Worldwide, Inc. (2006) 39 Cal.4th 384, 388-389.) “In performing our de novo review, 

we must view the evidence in a light favorable to [the] plaintiff as the losing party 

[citation], liberally construing [the plaintiff’s] evidentiary submission while strictly 

scrutinizing [the] defendant[’s] own showing, and resolving any evidentiary doubts or 

ambiguities in [the] plaintiff’s favor.” (Saelzler v. Advanced Group 400 (2001) 25 

Cal.4th 763, 768-769.) 

The trial court shall grant the defendant’s motion for summary judgment “if all the 

papers submitted show that there is no triable issue as to any material fact and that 

[defendant] is entitled to a judgment as a matter of law.” (Code Civ. Proc., § 437c, subd. 

(c).) A defendant moving for summary judgment meets its burden of showing that there 

is no merit to a cause of action by showing that one or more elements of the cause of 

action cannot be established or that there is a complete defense to that cause of action. 

(Code Civ. Proc., § 437c, subd. (p)(2).) Once the defendant has made the required 

showing, the burden shifts back to the plaintiff to show that a triable issue of one or more 

material facts exists as to that cause of action or defense. (Aguilar v. Atlantic Richfield 

Co. (2001) 25 Cal.4th 826, 849, 853.) California law requires that “a defendant moving 

for summary judgment . . . present evidence, and not simply point out that the plaintiff 

does not possess, and cannot reasonably obtain, needed evidence.” (Id. at p. 854, fn. 

omitted.)

In the present case, the trial court found that the primary assumption of risk 

doctrine applied. Whether the assumption of risk doctrine applies in a particular case is a 

question of law. (See, e.g., Kahn v. East Side Union High School Dist. (2003) 31 Cal.4th 

990, 1004 (Kahn) [“the question of ‘the existence and scope’ of the defendant’s duty is 
7

one of law to be decided by the court, not by a jury”]; Beninati v. Black Rock City, LLC 

(2009) 175 Cal.App.4th 650, 656; Staten v. Superior Court (1996) 45 Cal.App.4th 1628, 

1632.) The question whether that duty has been breached is a question of fact. (See, e.g., 

Shin v. Ahn (2007) 42 Cal.4th 482, 497.)

II. Negligence and the Application of Primary Assumption of Risk

A. Legal Principles

“The doctrine of assumption of risk in negligence cases embodies two 

components: (1) primary assumption of risk—where the defendant owes no duty to the 

plaintiff to protect him or her from the particular risk, and (2) secondary assumption of 

risk—where the defendant owes the plaintiff a duty, but the plaintiff knowingly 

encounters a risk created by the breach of that duty. [Citation.] Primary assumption of 

risk operates as a complete bar to the plaintiff’s cause of action, while the doctrine of 

secondary assumption of risks is part of the comparative fault scheme, where the trier of 

fact considers the relative responsibility of the parties in apportioning the loss.” (Saffro v. 

Elite Racing, Inc. (2002) 98 Cal.App.4th 173, 178.) 

“Although persons generally owe a duty of due care not to cause an unreasonable 

risk of harm to others (Civ. Code, § 1714, subd. (a)), some activities––and, specifically, 

many sports––are inherently dangerous.” (Kahn, supra, 31 Cal.4th at p. 1003.) “Primary 

assumption of risk is merely another way of saying no duty of care is owed as to risks 

inherent in a given sport or activity. The overriding consideration in the application of 

this principle is to avoid imposing a duty which might chill vigorous participation in the 

sport and thereby alter its fundamental nature.” (Wattenbarger v. Cincinnati Reds, Inc. 

(1994) 28 Cal.App.4th 746, 751-752.) 

The Supreme Court in Knight v. Jewett (1992) 3 Cal.4th 296 (Knight) applied the 

doctrine of primary assumption of risk to an informal game of touch football. (Id. at p. 

300.) The court explained that certain dangers are often integral to “the sport itself” and 

that defendants generally have no duty to protect a plaintiff from “risks inherent in the 

sport itself . . . .” (Id. at p. 315.) Those involved in the sporting activity have a duty not 

to increase the risk of harm that is inherent in the sport itself. (Id. at p. 320.) Conduct is 
8

not inherent in a sport “if the participant intentionally injures another player or engages in 

conduct that is so reckless as to be totally outside the range of the ordinary activity 

involved in the sport.” (Ibid., fn. omitted.) 

In the recent case of Nalwa v. Cedar Fair, L.P. (2012) 55 Cal.4th 1148 (Nalwa), 

the Supreme Court clarified that “the primary assumption of risk doctrine is not limited to 

activities classified as sports, but applies as well to other recreational activities ‘involving 

an inherent risk of injury to voluntary participants . . . where the risk cannot be eliminated 

without altering the fundamental nature of the activity.’ [Citation.]” (Id. at p. 1156.) 

The court stated that a defendant has a limited duty of care under the primary assumption 

of risk doctrine, which is “the duty not to unreasonably increase the risk of injury over 

and above that inherent” in the recreational activity. (Id. at p. 1152.) 

B. Matas Did Not Unreasonably Increase the Risk of Injury to Murphy

An activity falls under the doctrine of primary assumption of risk if “ ‘ “the 

activity is done for enjoyment or thrill, requires physical exertion as well as elements of 

skill, and involves a challenge containing a potential risk of injury.” ’ ” (Calhoon v. 

Lewis (2000) 81 Cal.App.4th 108, 115.) The court in Record, supra, 73 Cal.App.4th 472, 

held that primary assumption of risk applies when a person is injured while voluntarily 

participating in the recreational activity of tubing.4 Murphy does not object to the 

application of primary assumption of risk to tubing, but contends that the reckless manner 

in which Matas drove the motorboat increased the risk of injury and therefore there is a 

triable issue of fact as to whether Matas and Cornerstone breached their duty. (See Kahn, 

supra, 31 Cal.4th at p. 1004 [“defendants generally do not have a duty to protect the 

plaintiff from the risks inherent in the sport, or to eliminate risk from the sport, although 

they generally do have a duty not to increase the risk of harm beyond what is inherent in 

the sport”].) Thus, we must determine whether the undisputed facts establish as a matter 

of law that Matas’s conduct did not increase the risk of injury inherent in the sport of 

 

4 Our Supreme Court in Nalwa, supra, 55 Cal.4th 1148, did not disapprove of 

cases in which the doctrine of primary assumption of risk had been applied in contexts 

other than sports and the court specifically cited Record. (Nalwa, at pp. 1155-1156.)
9

tubing or that Matas’s conduct was not “so reckless as to be totally outside the range of 

the ordinary activity involved” in tubing. (Knight, supra, 3 Cal.4th at p. 320.) 

The question of which risks are inherent in a recreational activity is fact-intensive 

but may be resolved by a summary judgment motion. (Nalwa, supra, 55 Cal.4th at p. 

1158.) Judges deciding inherent risk questions under this doctrine “may consider not 

only their own or common experience with the recreational activity involved but may 

also consult case law, other published materials, and documentary evidence introduced 

by the parties on a motion for summary judgment.” Vigorous participation often includes 

accidentally careless behavior and imposition of liability in such circumstances would 

chill participation in the sport. (See Moser v. Ratinoff (2003) 105 Cal.App.4th 1211, 

1222 (Moser); see also Shin v. Ahn, supra, 42 Cal.4th at p. 489 [“[u]nder the primary 

assumption of risk doctrine, the defendant owes no duty to protect a plaintiff from 

particular harms arising from ordinary, or simple negligence”].) 

Murphy contends that Matas was reckless in his operation of the motorboat and 

increased the risks inherent in tubing. Specifically, she asserts that the boat was traveling 

27 to 28 miles per hour while the manual and warning label instruct boat drivers not to 

exceed 20 miles per hour when towing adults in a tube. The manual and label admonish 

not to exceed 15 miles per hour when towing children in a tube. Additionally, Matas was 

reckless, according to Murphy, because he made sharp turns. 

Arguments similar to those made by Murphy in this appeal were raised by the 

plaintiff and rejected by the appellate court in Record, supra, 73 Cal.App.4th 472. In 

Record, the plaintiff sustained a spinal injury after falling out of an inner tube towed by a 

motorboat. (Id. at p. 475.) The plaintiff sued the person operating the boat, and the trial 

court granted the defendant’s motion for summary judgment on the grounds that the 

doctrine of primary assumption of risk applied. (Ibid.) The plaintiff argued on appeal 

that even if primary assumption of risk applied to the recreational activity of tubing, he 

raised a triable issue of fact as to whether the defense did not apply in this particular 

situation for the following reasons: he told the defendant to go slowly and take it easy 

because of his preexisting injury; the defendant was reckless because he made a sharp 
10

turn and was traveling at 30 miles per hour at the time plaintiff was injured; and the 

defendant, as the driver of the boat, controlled the tube rider’s activity and was not a 

coparticipant. (Id. at pp. 483-485.) The appellate court rejected all of the plaintiff’s 

arguments.

With respect to the first claim that the plaintiff had informed the defendant about 

his preexisting injury and had asked the defendant to go slowly, the appellate court in 

Record, supra, 73 Cal.App.4th 472, cited the Supreme Court’s statement in Knight that a 

party cannot change the inherent nature and risk of a sport by making a unilateral request 

that other participants play less vigorously. (Record, at p. 482, citing Knight, supra, 3 

Cal.4th at p. 300 [it was immaterial that the plaintiff asked the defendant when playing 

touch football “ ‘ “not to play so rough” ’ ” and to “ ‘ “be careful” ’ ”].) The Record 

court explained that “tube riders engage in the activity of tubing in order to experience 

the thrill of whipping across the water at speeds [that] challenge their ability to stay on 

the tube. Both appellant and respondent testified via deposition that falling out of the 

inner tube is a ‘common occurrence’ and that ‘[e]verybody falls off the innertube.’ 

Neither appellant’s preexisting injuries nor his admonition to respondent to ‘[k]ick back’ 

and ‘take it easy’ can be used to define the nature of the activity or the parties’ 

relationship to it. Nor can these factors be used to redefine the ordinary range of activity 

and the concomitant risks inherent in the sport and thus enlarge the potential liability of 

coparticipants.” (Record, at pp. 483-484, fn. omitted.)

The appellate court in Record, supra, 73 Cal.App.4th 472, also considered the 

plaintiff’s assertion that the defendant was reckless as he was going 30 miles per hour 

and making a sharp turn at the time of the injury and the testimony of plaintiff’s expert 

that these actions exceeded the recommendations of the manufacturers of tubing 

equipment. (Id. at p. 484.) The appellate court in Record considered the Supreme 

Court’s holding in Ford v. Gouin (1992) 3 Cal.4th 339 (Ford), where the plaintiff had 

been injured while waterskiing. The Ford court explained: “Imposition of legal liability 

on a ski boat driver for ordinary negligence in making too sharp a turn, for example, or in 

pulling the skier too rapidly or too slowly, likely would have the same kind of 
11

undesirable chilling effect on the driver’s conduct that the courts in other cases feared 

would inhibit ordinary conduct in various sports. As a result, holding ski boat drivers 

liable for their ordinary negligence might well have a generally deleterious effect on the 

nature of the sport of waterskiing as a whole.” (Id. at p. 345.)

The court in Record, supra, 73 Cal.App.4th 472, presumed for the purpose of the 

summary judgment review that the boat was traveling five to ten miles per hour over the 

recommended speed limit for towing adults in the tube and that the respondent made a 

sharp three-quarter turn. (Id. at p. 485.) The court concluded that such activity “was 

merely negligent, ‘an “inherent risk” of [the] sport,’ barring recovery for the [plaintiff]. 

[Citation.] Holding a boat driver to a duty to ensure the tube rider does not fall off the 

tube would inevitably chill the driver’s willingness to provide the exciting ride that 

appears to be necessary to tubing and would narrow the spectrum of excitement, 

changing the fundamental nature of the sport.” (Record, at p. 485.)

The court in Record, supra, 73 Cal.App.4th 472, also discounted the contention 

that the primary assumption of risk doctrine did not apply because the boat driver had 

control over the tube rider’s speed and direction. (Id. at p. 485.) The court noted that the 

boat driver was considered to be a coparticipant in the sport of waterskiing (see Ford, 

supra, 3 Cal.4th at p. 345), and thus a boat driver was a coparticipant in tubing. (Record, 

at pp. 485-486.) The court noted that both parties chose to engage in a mutually 

enjoyable activity and, thus, both the tube rider and the boat driver were participants in 

that activity. (Ibid.)

Under the holding of Record, supra, 73 Cal.App.4th 472, the primary assumption 

of risk doctrine bars any claim of negligence in the present case. (See also Bjork v. 

Mason (2000) 77 Cal.App.4th 544, 550 (Bjork) [applied primary assumption of risk to 

tubing].) Murphy’s argument that the primary assumption of risk doctrine does not 

prevent her claim is based on her evidence that Matas was traveling 27 to 28 miles per 

hour and that driving at this speed was reckless because the manual and warning label 

instructed boat drivers not to exceed 20 miles per hour when towing adults in a tube and 

15 miles per hour when towing children in a tube. Further, she claims that Matas was 
12

reckless when he made a sharp turn. As already discussed, these identical arguments 

were raised and rejected in Record. Thus, even if we presume that Matas was driving the 

boat seven to eight miles per hour above the recommended speed for an adult and was 

making sharp turns, such behavior was simply negligent and not intentional or reckless 

misconduct outside the range of ordinary activity involved in tubing. Murphy asserts that 

a child was in the tube and thus Matas should have been traveling 15 miles per hour. 

Murphy, however, is an adult and there is no claim of an injury by a child in this lawsuit. 

Murphy also argues that even Schaffer admitted in his declaration that pulling the 

tube across the wake at a high speed creates the risk that riders in the tube will be ejected 

into the water. She asserts that the evidence showed that Matas was trying to eject the 

riders from the tube. In support of this, she cites the speed of the boat, the fact that other 

people complained of injuries, and the fact that one child was thrown from the boat. 

None of Murphy’s evidence creates a triable issue regarding whether Matas 

intended to throw people from the boat. More significantly, Murphy was not injured 

because she was thrown into the water. She was not thrown into the water. Her injury to 

her back was sustained while riding in the tube. Thus, the question is whether Matas 

intended to injure Murphy or engaged in reckless conduct. As already discussed, 

presuming that the speed of the boat was above the recommended 20 miles per hour for 

an adult, this speed did not constitute reckless conduct that increased the risks above 

those inherent in tubing. (See Distefano v. Forester (2001) 85 Cal.App.4th 1249, 1276 

(Distefano) [conduct of the driver of a dune buggy was not so reckless as to be 

completely outside the range of the activities involved in the sport of off-roading when he 

collided with an off-road motorcycle and “was driving fast in the middle of a narrow dirt 

trail and cresting a blind hill”].) Nor does any of the evidence show any intent to injure 

Murphy. Indeed, in her separate statement of undisputed facts in opposition to the 

summary judgments in the lower court, Murphy indicated that it was “[u]ndisputed that 

she did not allege that Matas intentionally injured her.” 

Finally, Murphy stresses that Matas knew that she had been in the hospital just 

before this incident. This fact, however, is irrelevant to the application of the primary 
13

assumption of risk doctrine. The focus is on the nature of the sport or recreational 

activity itself and not the particular plaintiff’s subjective knowledge or expectations and 

the plaintiff’s preexisting injury cannot change the definition of the activity or the parties’ 

relationship to it. (Knight, supra, 3 Cal.4th at pp. 312-313; Record, supra, 73 

Cal.App.4th at pp. 482, 483.) 

Tubing clearly involves riding in an inflatable tube and the risk that the ride might 

be turbulent and that the tube might go airborne. “[T]ube riders engage in the activity of 

tubing in order to experience the thrill of whipping across the water . . . .” (Record, 

supra, 73 Cal.App.4th at p. 483.) Requiring the driver of the boat towing the raft to 

eliminate any risk that would prevent a person from suffering a back injury, as Murphy 

suffered, while riding in a turbulent or airborne raft would alter the fundamental nature of 

tubing. Here, Murphy voluntarily participated in tubing and suffered the type of injury 

that is inherent to tubing. Accordingly, we conclude that the doctrine of primary 

assumption of risk bars Murphy’s claim of negligence.

C. Evidentiary Rulings

Murphy argues that the trial court incorrectly overruled her objections to the 

evidence Viss submitted with his reply to Murphy’s opposition to his summary judgment 

motion. In particular, she objects to three photographs of Murphy that were found at a 

website that showed a smiling Murphy in the tube with captions, such as, “Laughing 

tons.” Murphy argues that the trial court erred in considering this evidence because it 

was attached to Viss’s reply papers and that this error should result in reversal. (See San 

Diego Watercrafts, Inc. v. Wells Fargo Bank (2002) 102 Cal.App.4th 308, 312-313 [right 

to due process violated when court granted summary judgment and relied on evidence 

filed after the opposition to the summary judgment motion had been filed].) 

The photographs of Murphy in the tube, without the captions, had been produced 

by Murphy in discovery. Murphy maintains that someone else altered the captions taken 

from the web site. She maintains that the original caption stated, “Laughing tons, but that 

was before we were about 31⁄2 feet into the air!!!” 
14

Murphy incorrectly asserts that any error in considering this evidence should result 

in reversal. Murphy must show that she was prejudiced by the trial court’s failure to 

strike the evidence attached to Viss’s reply papers. (Cal. Const., art. VI, § 13; Code Civ. 

Proc., § 475.) Here, Murphy’s sole claim of prejudice is that the “deleted language puts a 

far different spin on Murphy’s attitude toward the ride than is reflected by Viss’s 

argument in his reply[,] which is based upon altered evidence.” 

Murphy has completely failed to demonstrate any prejudice. The photographs 

depicting Murphy as enjoying herself or laughing while tubing with captions indicating 

that she was enjoying her tubing experience are completely irrelevant. As already 

discussed, Murphy’s subjective experience has no bearing on the application of the 

primary assumption of risk doctrine. (See Knight, supra, 3 Cal.4th at pp. 312-313.) 

Thus, even if this evidence was erroneously considered, any such error was harmless.

D. Spoliation

Murphy claims that Matas offered different explanations regarding the 

disappearance of the envelope he received from Viss. She asserts that Viss gave Matas 

an envelope that contained the manuals to the boat and raft and Matas was unable to 

produce this envelope. She contends that the missing envelope creates “an inference of 

spoliation of evidence” that reflects Matas’s “consciousness of guilt” and that this 

inference provided sufficient evidence to require the negligence claim go to the jury. 

Viss testified he recalled giving Matas an envelope with some information when 

Matas borrowed his boat and inflatable raft. He recalled that the envelope contained 

manuals of the boat, the current registration, and insurance. He could not remember 

whether there was any manual in the envelope concerning the Sea-Doo tube. Matas 

testified that he simply pulled out the registration and insurance from the envelope and 

then put them back into the envelope. He denied pulling out or looking at the manuals. 

When asked what he did with the envelope, he answered: “I held onto it, had it in my 

possession throughout the event in case it was necessary to use it. . . . [¶] I typically 

make a copy of those things and then destroy them afterwards, but I don’t know what I 

did with it after that. I have looked for it and haven’t found it.” Subsequently, Matas 
15

testified that he probably last saw the envelope about a month after the tubing incident 

when he spotted it on his desk. He stated that he was going to mail it back to Viss but 

must have misplaced it. 

Murphy claims that the abovementioned testimony is contradictory and supports 

an inference of spoliation of evidence. He maintains that Matas destroyed the evidence, 

which shows a consciousness of guilt or liability and cites numerous cases on spoliation. 

(Donchin v. Guerrero (1995) 34 Cal.App.4th 1832, 1841 [false exculpatory statement is 

evidence of consciousness of liability]; Bihun v. AT&T Information Systems, Inc. (1993) 

13 Cal.App.4th 976, 994 [in sexual harassment case, the harasser’s personnel file could 

not be located, and the appellate court upheld the trial court’s instruction that the jury 

could infer that the file contained evidence damaging to the defendant’s case if it 

concluded that the defendant had suppressed the file], disapproved on other grounds in 

Lakin v. Watkins Associated Industries (1993) 6 Cal.4th 644, 664; People v. Neely (1993) 

6 Cal.4th 877, 896-897 [evidence of flight admissible to indicate consciousness of guilt]; 

People v. Burns (1987) 196 Cal.App.3d 1440, 1455 [letter showing a plan to fabricate 

evidence to exonerate the defendant is relevant to show a consciousness of guilt]; Thor v. 

Boska (1974) 38 Cal.App.3d 558, 565-568 [defendant unable to produce original clinical 

record concerning treatment of plaintiff after charged with malpractice, and unavailability 

of original records created a strong inference of consciousness of guilt].) 

None of the foregoing cases relied upon by Murphy is relevant. First, Matas’s 

testimony did not support an inference of spoliation. Matas consistently stated that he did 

not know what he did with the envelope. He did not deny that the manuals were inside 

the envelope; he claimed that he had not read them if they were in the envelope. Second, 

destroying the envelopes did not prevent the court from knowing the information 

contained in the manuals. Indeed, Murphy presented the contents of the manuals in 

support of her summary judgment motion. Third, whether Matas read the manuals was 

not material to the application of the primary assumption of risk doctrine. Even if we 

presume that the envelope contained the manuals and that Matas read them and then 

destroyed the envelope, the primary assumption of risk doctrine still applies. As already 
16

discussed, Matas’s knowledge of the dangers posed by his conduct or the maximum 

speed to drive the boat is immaterial as the record is devoid of any allegation or evidence 

that Matas intended to injure Murphy. Matas’s knowledge about the speed limit 

contained in the manual had no bearing on the objective standard of whether his conduct 

increased the risk inherent to tubing. 

E. Negligence Per Se

Murphy argues that Matas violated the Harbors and Navigation Code section 655, 

subdivision (a) and that this violation constitutes negligence per se, and defeats the 

primary assumption of risk doctrine. This statute provides: “No person shall use any 

vessel or manipulate water skis, an aquaplane, or a similar device in a reckless or 

negligent manner so as to endanger the life, limb, or property of any person. The 

department shall adopt regulations for the use of vessels, water skis, aquaplanes, or

similar devices in a manner that will minimize the danger to life, limb, or property 

consistent with reasonable use of the equipment for the purpose for which it was 

designed.” (Harb. & Nav. Code, § 655, subd. (a).) Matas also cites Harbors and 

Navigations Code section 650, which states that “[i]t is the policy of this state to promote 

safety for persons and property in and connected with the use and equipment of vessels 

and to promote uniformity of laws relating thereto.”

Negligence per se is an evidentiary doctrine codified at Evidence Code section 

669. This doctrine is based on “the rule that a presumption of negligence arises from the 

violation of a statute which was enacted to protect a class of persons of which the 

plaintiff is a member against the type of harm that the plaintiff suffered as a result of the 

violation.” (Quiroz v. Seventh Ave. Center (2006) 140 Cal.App.4th 1256, 1285.) If the 

presumption of negligence is established under subdivision (a) of Evidence Code section 

669, it may be rebutted under subdivision (b) of this statute. Thus, the doctrine of 

negligence per se does not establish tort liability or a private right of action for violation 

of a statute. (Quiroz, at p. 1285.) 

In her opening brief, Murphy does not mention Whelihan v. Espinoza (2003) 110 

Cal.App.4th 1566, 1569 (Whelihan) or Peart v. Ferro (2004) 119 Cal.App.4th 60, 65 
17

(Peart), which hold that negligence per se based on violating provisions of the Harbors 

and Navigation Code does not abrogate the primary assumption of risk doctrine. Rather, 

she relies upon the concurring opinion in Ford, supra, 3 Cal.4th at page 351 (conc. opn. 

of Kennard, J.). In the concurring opinion, Justice Kennard was joined by Justices 

Panelli and Baxter, and they maintained that a plaintiff who has proceeded to encounter a 

known risk should be deemed to have impliedly consented to any harm incurred and 

should be completely precluded from recovering damages as compensation from the 

party who posed the known risk. (Id. at pp. 351-364.) The concurrence in Ford does not 

benefit Murphy but, in any event, the majority in Nalwa, supra, 55 Cal.4th at page 1158 

clearly rejected applying the implied-consent theory set forth by Justice Kennard in her 

concurrence in Ford. 

Murphy also quotes extensively from the dissenting opinion of Chief Justice 

George (Ford, supra, 3 Cal.4th at pp. 364-365) and the dissenting opinion of Justice 

Mosk (id. at p. 369) in Ford. These justices stated that the plaintiff was within the class 

of persons Harbors and Navigation Code section 658 was intended to protect, and 

therefore under Evidence Code section 669, the defendant had violated a legal duty of 

care to the plaintiff. (Ford, at pp. 364-369.) As the court in Moser, supra, 105 

Cal.App.4th 1211 pointed out, subsequently, in Cheong v. Antablin (1997) 16 Cal.4th 

1063, 1069-1070 (Cheong), four justices expressed the view that Evidence Code section 

669 does not bar the application of the assumption of risk doctrine unless the language of 

the statute indicates a legislative intent to eliminate the assumption of risk defense. 

(Moser, at pp. 1225-1226.) 

In her reply brief, Murphy claims that the Supreme Court in Nalwa, supra, 55 

Cal.4th 1148 pronounced that negligence per se trumps the application of the primary 

assumption of risk doctrine. In Nalwa, the plaintiff who was injured while riding bumper 

cars asserted that amusement parks are subject to state regulations for safety and 

inspection, which should preclude applying the primary assumption of risk doctrine to 

amusement park rides. (Id. at p. 1159.) The Nalwa court observed that the plaintiff was 

not asserting that the defendant had violated any particular regulation in the operation of 
18

the ride and was “not arguing for a presumption of negligence under Evidence Code 

section 669, subdivision (a) that would preclude application here of the assumption of 

risk doctrine. (See generally Cheong . . . , supra, 16 Cal.4th at pp. 1070-1072.)” (Nalwa, 

at p. 1159.) In support of her argument, Murphy quotes the above language in Nalwa and 

omits the citation to Cheong. Although separate opinions in Cheong indicated that the 

justices held varied views on the relationship between the assumption of risk and the 

doctrine of negligence per se, the majority of the justices expressed the opinion that the 

common law principles of assumption of risk are not abrogated by the violation of a 

statute unless the statute evinces a clear intent to modify common law assumption of risk 

principles. (Cheong, at pp. 1069-1070.) Thus, the above quote from Nalwa, when 

interpreted in its entire context, simply indicates that the plaintiff was not arguing that 

negligence per se applied and therefore the defense of the assumption of risk could not be 

disregarded on that basis. Negligence per se, however, could survive this defense if the 

violated statute expresses a clear intent to modify common law assumption of risk 

principles. 

Although the Supreme Court has not yet directly addressed the application of 

primary assumption of risk when the defendant’s negligence is based on the violation of a 

statute, Courts of Appeal have held that statutory provisions do not abrogate this defense 

unless the Legislature “has explicitly and unambiguously manifested a clear intent to do 

so. [Citations.]” (Peart, supra, 119 Cal.App.4th at p. 79; Whelihan, supra, 110 

Cal.App.4th at p. 1575; see also Moser, supra, 105 Cal.App.4th at p. 1226 [facts showed 

that the bicyclist defendant violated provisions of the Vehicle Code while participating in 

the long-distance bicycle ride but the injured bicyclist’s claim of negligence per se was 

barred by the primary assumption of risk doctrine because a collision between bicycle 

riders was an inherent risk in the ride]; Distefano, supra, 85 Cal.App.4th 1249 

[motorcyclist injured when he collided with a dune buggy while engaged in the sport of 

off-roading could not recover on a claim of negligence per se based on violations of the 

Vehicle Code because the collision was an inherent risk in the sport and the primary 
19

assumption of risk doctrine barred the claim].) In her reply brief, Murphy asserts that 

Peart and Whelihan were wrongly decided.

In Whelihan, supra, 110 Cal.App.4th 1566, two jet skiers collided and the injured 

skier sued the other for, among other things, negligence per se. (Id. at p. 1569.) The 

injured skier claimed that the doctrine of primary assumption of risk did not apply 

because Harbors and Navigation Code sections 655, subdivision (a), and 655.7, 

subdivision (c) define the duty and standard of care when operating watercraft on public 

waterways and these statutes were enacted after the Supreme Court’s decisions in Knight, 

supra, 3 Cal.4th 296 and Ford, supra, 3 Cal.4th 339. (Whelihan, at p. 1574.) In rejecting 

the plaintiff’s contention, the court explained that permitting the Harbors and Navigation 

Code to “ ‘trump’ ” the doctrine of primary assumption of risk “would chill vigorous 

participation in the sport of jet skiing and . . . have a deleterious effect on the nature of 

the sport.” (Whelihan, at pp. 1574, 1575.)

In Peart, supra, 119 Cal.App.4th 60, our court considered a claim for negligence 

per se when a minor was injured in a collision with another minor and both were in 

personal watercraft. The court concluded that the primary assumption of risk applied. 

(Id. at p. 78.) The plaintiff argued that Harbors and Navigation Code sections 655.6, 

658.5, and 655.3 “ ‘govern the operation of personal watercraft by minors in 

California,’ ” and [that] these statutes “establish specific duties of care inconsistent with 

the primary assumption of risk doctrine, impose criminal penalties, and thereby 

necessarily give rise to civil liability for their violation pursuant to Evidence Code section 

669.” (Peart, at pp. 78-79, fn. omitted.) The court noted that courts “have repeatedly 

affirmed that statutory provisions like those at issue do not abrogate, supersede or 

displace the primary assumption of risk doctrine unless the legislative authority has 

explicitly and unambiguously manifested a clear intent to do so.” (Id. at p. 79, citing 

Cheong, supra, 16 Cal.4th at pp. 1069-1070; Moser, supra, 105 Cal.App.4th at pp. 1225-

1226; Distefano, supra, 85 Cal.App.4th at pp. 1266-1267, 1271-1274.) At the time these 

statutes were enacted, the Legislature was aware of the primary assumption of risk 

doctrine in Ford, supra, 3 Cal.4th 339, which had applied this doctrine to the sport of 
20

water-skiing. The court in Peart concluded that “if the Legislature had intended to 

supersede this well-known common law doctrine, it would have said so.” (Peart, at p. 

81.) The court held that primary assumption of risk was a complete defense to the claim 

of negligence per se, which had been based on violations of the Harbors and Navigations 

Code. (Peart, at p. 82.)

Murphy complains that Whelihan and Peart were wrongly decided. She 

complains that these courts ignored language in Finnegan v. Royal Realty Co. (1950) 35 

Cal.2d 409, overruled on another issue in Witt v. Jackson (1961) 57 Cal.2d 57, 70. In 

Finnegan, the employees of a tenant sued a landlord when they were injured in a fire on 

the property owned by the landlord. This case is not relevant as it did not involve 

primary assumption of risk, and did not involve the voluntary participation in an activity 

where the risk could not be eliminated without altering the fundamental nature of the 

activity. 

We agree with the reasoning of Peart, Whelihan, Moser, and Distefano and hold 

that the defense of primary assumption of risk bars a claim of negligence per se unless the 

statute violated explicitly and unambiguously manifests a clear intent to supersede the 

primary assumption of risk defense or the plaintiff establishes that the participant 

breached his or her legal duty by intentionally injuring the plaintiff or by engaging in 

conduct that was so reckless as to be completely outside the range of the ordinary activity 

involved in the sport or recreational activity.

II. Negligent Entrustment

Murphy also alleged a cause of action for negligent entrustment against 

Cornerstone and Viss. To prove negligent entrustment, Murphy must prove that Matas 

was negligent in his operation of the boat; that Viss (or Cornerstone) was an owner of the 

boat operated by Matas; that Viss (or Cornerstone) knew, or should have known, that 

Matas was incompetent or unfit to drive the boat; that Viss (or Cornerstone) permitted 

Matas to use the boat; and that Matas’s incompetence or unfitness to drive was a 

substantial factor in causing harm to the plaintiff. (See Jeld-Wen, Inc. v. Superior Court 

(2005) 131 Cal.App.4th 853, 863-864, citing CACI No. 724.) 
21

It is undisputed Viss is the sole owner of the boat driven by Matas. Thus, the trial 

court properly granted summary judgment in favor of Cornerstone, since the undisputed 

facts establish that Cornerstone did not own the boat. 

Furthermore, the court correctly granted summary judgment in favor of both Viss 

and Cornerstone because the primary assumption of risk defense prevents Murphy’s 

negligent entrustment cause of action. One of the elements of negligent entrustment is

that the driver of the boat was negligent. (See Jeld-Wen, Inc. v. Superior Court, supra, 

131 Cal.App.4th at pp. 863-864.) Since we have concluded that Matas did not breach 

any legal duty to Murphy when he was driving the motorboat, Murphy’s claim of 

negligent entrustment must also fail, as she cannot, as a matter of law, establish the 

element of the driver’s negligence. 

The court in Truong v. Nguyen (2007) 156 Cal.App.4th 865 addressed the 

plaintiff’s claim of negligent entrustment in a situation where the defense of primary 

assumption of risk applied and thus the driver of the boat had no legal duty to the 

participant in the activity. In Truong, two personal watercrafts collided and the passenger 

in one of the boats died. The parents of the decedent sued the driver and owner of the 

watercraft involved in the collision for wrongful death based on negligence, negligence 

per se, and negligent entrustment. (Id. at pp. 869-870.) The court concluded that the 

defense of primary assumption of risk applied to the passenger of the watercraft. (Id. at 

p. 892.) The court cited Whelihan and Peart and affirmed the trial court’s ruling that the 

negligence per se cause of action lacked merit because the primary assumption of risk 

doctrine trumped any duty that might be based on a violation of the statute or regulations. 

(Truong, at p. 892.) The court stated that its “conclusion that the assumption of risk 

doctrine applies to the negligence cause of action against [the driver of the watercraft] 

and relieved him of any duty to [the decedent] undercuts [the parents’] claim of negligent 

entrustment. If [the driver] was not negligent because he had no duty to [the decedent], 

then [the owner of the watercraft] cannot be negligent in entrusting the vessel to [the 

driver].” (Id. at p. 893.) 
22

Murphy relies on our decision, Bjork, supra, 77 Cal.App.4th 544, when urging this 

court to conclude that the negligent entrustment claim can survive the defense of primary 

assumption of risk. In Bjork, the defendant owned and supplied the boat used for tubing. 

(Id. at p. 552.) The plaintiff was riding in the inner tube that was being towed by the 

motorboat driven by the defendant and was injured when the rope broke and struck him. 

We concluded that the defendant in his capacity as the boat operator was not liable 

because his acts were neither intentional nor reckless and the defense of primary 

assumption of risk applied. (Id. at pp. 551-552.) The trial court should not have granted 

summary judgment, however, because the primary assumption of risk doctrine did not 

apply as an absolute bar to the plaintiff’s theory that the defendant, as the owner of the 

boat, negligently supplied a defective cable, which snapped and caused injury to the 

plaintiff. (Id. at p. 55.) “[T]he act of supplying the equipment is something separate and 

distinct from participation in the sport and the tests for liability are accordingly different.” 

(Id. at p. 553, italics omitted.) We held that the owner had a duty not to materially 

increase the risks to the participant beyond those inherent in the participation in the sport 

or activity, and the defense of primary assumption of risk did not insulate equipment 

suppliers from liability for injury from providing defective equipment. (Id. at pp. 553-

556.) 

Unlike the situation in Bjork, the present record contains no allegation or evidence 

that Murphy was injured as a result of any defect in the motorboat or Sea-Doo raft. The 

allegations are that Murphy was injured as a result of Matas’s operation of the motorboat. 

Since we have concluded that Matas did not breach any legal duty to Murphy and was not 

liable for his driving of the boat, Viss and Cornerstone cannot be liable to Murphy for 

providing the motorboat and tube to Matas. There is no allegation or evidence that Viss 

or Cornerstone materially increased the risks inherent to tubing. Bjork is not helpful to 

Murphy. 

Accordingly, the trial court did not err in granting summary judgment against 

Murphy’s claim of negligent entrustment. 
23

DISPOSITION

The judgment is affirmed. Murphy is to pay the costs of appeal.

_________________________

Brick, J.*

We concur:

_________________________

Kline, P.J.

_________________________

Richman, J.

* Judge of the Alameda County Superior Court, assigned by the Chief Justice 

pursuant to article VI, section 6 of the California Constitution.