Cambridge Plating Co. v. Napco, Inc. , 991 F.2d 20 ( 1993 )


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  •                   UNITED STATES COURT OF APPEALS
    FOR THE FIRST CIRCUIT
    No. 92-2242
    CAMBRIDGE PLATING CO., INC.,
    Plaintiff, Appellant,
    v.
    NAPCO, INC.,
    Defendant, Appellee.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Douglas P. Woodlock, U.S. District Judge]
    Before
    Torruella, Circuit Judge,
    Coffin, Senior Circuit Judge,
    and Boudin, Circuit Judge.
    Thomas K. Christo with whom David  B. Chaffin, Joseph M.  Kaigler,
    and Hare & Chaffin were on brief for appellant.
    Richard  L. Burpee with whom William A. McCormack was on brief for
    appellee.
    April 22, 1993
    COFFIN, Senior  Circuit Judge.  Plaintiff  Cambridge Plating
    Company  filed  this  lawsuit  against  defendant  Napco  seeking
    damages  for  a  defective  wastewater  treatment  system.    The
    district court granted summary  judgment for Napco, concluding as
    a  matter of  law that  the statutes  of limitations  had run  on
    plaintiff's claims.  On appeal, Cambridge Plating argues that the
    court  should have  let the  jury decide  whether Massachusetts's
    "discovery" rule  suspended the running of  the limitations clock
    long  enough to  preserve  its claims.    Because we  agree  with
    plaintiff  that material  issues of fact  remain, we  reverse the
    summary judgment.
    I.
    A. Factual Background
    Cambridge   Plating  is  an   electroplating  business  that
    discharges wastewater containing  various metal contaminants into
    municipal  sewers.   In  an effort  to meet  strict environmental
    regulations  governing such discharges,  the company commissioned
    the design and installation of a wastewater treatment system from
    defendant  Napco.  The contract  price for the  system was nearly
    $400,000.    Cambridge   Plating  additionally  needed   to  make
    substantial changes  to its facility to  accommodate the enormous
    and  complex  array of  pipes,  tanks,  valves, mixers,  sensors,
    recorders  and other apparatus,  pushing the  total cost  for the
    project to $2.8 million.
    The system began running on October 30, 1984, but it was not
    then  fully operational,  and  Napco continued  installation  and
    -2-
    debugging for  another year.  In October  1985, Cambridge Plating
    began to experience unsatisfactory results; testing revealed that
    contaminant  levels   in  the  wastewater   discharges  sometimes
    exceeded  regulatory  limits.     Cambridge  Plating's   managers
    believed the problems stemmed from errors by the system operators
    or  errors in  wastewater sampling.   This  belief was  fueled by
    Napco representatives who, when contacted by Cambridge Plating on
    a number of occasions between early 1986 and 1988, suggested ways
    that Cambridge Plating could change  its operation of the system.
    Napco refused further visits to Cambridge Plating to service  the
    system unless it was paid $1,000 per day.
    Cambridge  Plating   took  several  steps   to  resolve  the
    perceived  operational or  sampling  problems.   It replaced  the
    system operators and implemented  the changes suggested by Napco.
    In late  1986, the company  asked a wastewater  treatment expert,
    Patrick Hunt, to evaluate the system  and the company's operation
    of  it.  Although Hunt found  some minor problems with the system
    itself, most of his  recommendations were operational.  Cambridge
    Plating  adopted  his  suggestions,  but  the  company  continued
    periodicaly to exceed lawful contaminant levels.
    On  December  29,  1988, the  Massachusetts  Water Resources
    Authority (MWRA), the agency responsible for effluent regulation,
    assessed  a   penalty  of  $682,250  on   Cambridge  Plating  for
    violations during  1986-88.  In February  1989, Cambridge Plating
    commissioned  another  expert,  Peter  Moleux,  to  evaluate  the
    system.   Moleux's  lengthy  inspection, which  included a  close
    -3-
    comparison  of Napco's  written materials with  the system  as it
    actually existed, revealed design flaws, failure to install parts
    specified in the  plans, and  substandard engineering  practices.
    Most significantly,  Moleux discovered  that Napco had  failed to
    install  an important component,  a static  mixer, inside  a pipe
    where system schematics  provided by Napco  indicated erroneously
    the  device  had  been placed.    Omission  of  the static  mixer
    rendered the  system incapable of adequately  cleaning 80 percent
    of the wastewater.
    After  Moleux's  evaluation, Cambridge  Plating  installed a
    static  mixer  at the  point called  for by  Napco's plans.   The
    system  thereafter worked  properly,  enabling Cambridge  Plating
    consistently to comply with the effluent limitations.
    B. Procedural Background
    Cambridge Plating  filed this action in  June 1990, alleging
    causes  of  action for  breach  of  contract, negligence,  fraud,
    negligent  misrepresentation, and violation  of the Massachusetts
    unfair  business practices  act, Mass.  Gen. Laws  Ann. ch.  93A.
    Napco moved  for summary judgment, arguing that  all of Cambridge
    Plating's  claims  were  barred  by the  applicable  statutes  of
    limitation.  The district court agreed with Napco.
    The court concluded that Cambridge Plating's purchase of the
    wastewater treatment system  was a  sale of goods,  and that  its
    contract  claim thus  was governed  by the  four-year limitations
    period under the  Uniform Commercial Code,  Mass. Gen. Laws  Ann.
    ch. 106,   2-725, rather than by the general six-year contractual
    -4-
    limitations period,  Mass. Gen. Laws Ann.  ch. 260,   2.   All of
    Cambridge Plating's causes of  action, therefore, were subject to
    either  three-  or  four-year  statutes of  limitation.1    These
    claims  were  time-barred,  the  court  determined, because  they
    accrued in late 1985,  some four and one-half years  before suit,
    when the company  learned that  the system was  failing to  bring
    effluent  discharges within  legal  limits.   The court  rejected
    plaintiff's  argument that  the limitations  periods were  tolled
    until Moleux's  evaluation, when Cambridge Plating  first learned
    the  cause of the system's  problems.  The  court concluded that,
    with  reasonable   diligence,   Cambridge  Plating   could   have
    discovered the defects once the system started malfunctioning.
    On   appeal,  Cambridge   Plating  argues  that   the  court
    misconstrued the contract and the discovery rule, which serves to
    toll certain  hard-to-discern claims, and improperly  usurped the
    jury's role when it decided as a matter of law that  the rule did
    not  preserve the company's claims.   Our review  of the district
    court's grant of  summary judgment  is plenary, and  we read  the
    record in the light most amicable to the party contesting summary
    judgment.  See,  e.g., Pagano v.  Frank, 
    983 F.2d 343
    , 347  (1st
    Cir. 1993).
    II.
    1  Tort  actions are  subject  to  a three-year  limitations
    period, Mass.  Gen. Laws  Ann.  ch. 260,    2A,  and a  four-year
    statute  applies to  consumer  protection actions  brought  under
    Chapter 93A, Mass. Gen. Laws Ann. ch. 260,   5A.
    -5-
    Cambridge Plating contends that  the district court erred in
    ruling as a matter of law that the contract with Napco was a sale
    of  goods contract  within  the  scope  of  the  UCC.    Although
    determining the type of contract at issue typically may be a jury
    function, see United States v. City  of Twin Falls, 
    806 F.2d 862
    ,
    870 (9th Cir. 1986),  we believe the facts here  are sufficiently
    clear and undisputed  that the  district court  was permitted  to
    make its finding as a matter of law.  
    Id.
    Cambridge  Plating  asserts  that the  UCC  is  inapplicable
    because  the  equipment it  purchased  does not  meet  the Code's
    definition of goods.  Under the UCC,  "goods" are defined as "all
    things . .  . which are movable at the  time of identification to
    the contract for sale . . . ."  See Mass. Gen. Laws Ann. ch. 106,
    2-105.   The  company  emphasizes  the  immense  size  of  the
    wastewater  treatment   system  and  its  integration   into  the
    electroplating  facility in  an effort  to equate  this situation
    with White v. Peabody  Construction Co., 
    386 Mass. 121
    ,  132, 
    434 N.E.2d 1015
     (1982), where the  court ruled that the UCC  does not
    apply to "the sale of structures attached to realty."
    But this comparison  is flawed.   The claims  in White  were
    based on contracts calling for "[t]he erection of  buildings" and
    for the sale  of a completed building  -- "not contracts for  the
    sale of bricks or  window frames or  caulking material."  
    Id. at 131, 133
    .  In this case, the proposal specified the components of
    the  system as  the  primary subject  of  the sale  and,  indeed,
    specifically described the contract as one "for goods."  See App.
    -6-
    at  113.  The proposal separately listed eighty-eight items to be
    provided  by  Napco,  eighty-two  of  which  involved  pieces  of
    equipment.   At the time of identification to the contract, these
    were movable and  therefore goods  within the scope  of the  UCC.
    Accord Twin  Falls,  806 F.2d  at 871  (components of  wastewater
    treatment  system   are  movable  goods).    It  was  only  after
    installation  into  plaintiff's  building that  the  items became
    merged with the  facility and  hence unmovable --  to borrow  the
    district  court's analogy, like cans  of paint sold  as goods and
    then applied to a wall.2
    That the  contract involved the purchase  of engineering and
    installation services, in  addition to a sale of  goods, is of no
    consequence.   In our view,  Massachusetts law is consistent with
    the general trend to view such mixed contracts as governed by the
    UCC.  See Twin  Falls, 806 F.2d at 871.   In White, 
    386 Mass. at 131-32
    , the Supreme Judicial  Court ruled that "[c]ontracts whose
    predominant  factor,  thrust,  or  purpose is  the  rendition  of
    services"  are  outside  the  scope  of  the  UCC.    It  follows
    inexorably that, if  the "rendition  of services" is  not at  the
    heart of a mixed contract, the UCC does govern.  See USM Corp. v.
    2 Plaintiff also  cites in support of its  position Chestnut
    Hill  Dev. Corp. v. Otis Elevator Co.,  
    653 F. Supp. 927
    , 932 (D.
    Mass.  1987), which  held that  structures "attached  to realty,"
    such  as  the elevator  system at  issue  there, are  not "goods"
    within  the meaning  of the  UCC.   Under  the UCC,  however, the
    inquiry  centers  on the  nature of  the  goods "at  the  time of
    identification  to the contract," Mass. Gen. Laws Ann. ch. 106,
    2-105.  It is beyond debate that the contract here listed movable
    items.  See  Burnham v. Mark IV Homes, Inc.,  
    387 Mass. 575
    , 581,
    
    441 N.E.2d 1027
     (1982) (modular homes are "goods" within coverage
    of UCC).
    -7-
    Arthur  D.  Little Systems,  Inc., 28  Mass.  App. 108,  119, 
    546 N.E.2d 888
      (1989) (contract  for computer system  involving both
    sale of goods and delivery of services governed by UCC).
    The  undisputed  facts  demonstrate  that  the deal  between
    Cambridge  Plating and Napco was  first, and foremost,  a sale of
    goods.    Most of  the purchase  price  was for  the specifically
    listed  items of equipment.   Only $68,970 of  the total contract
    price  of   $398,200  was   for  installation,3   and  purchasing
    installation  from  Napco  was  even  optional.    See  generally
    Chestnut Hill Dev.  Corp. v. Otis Elevator Co., 
    653 F. Supp. 927
    ,
    932  (D.  Mass.   1987)  (a  contract  to   supply  "hundreds  of
    components"  is not "one whose primary thrust is the rendition of
    services").  Because  the contract was so heavily weighted toward
    goods, it must fall within the scope of the UCC.
    The district court correctly  applied the UCC to plaintiff's
    contract claim.   We thus  move on  to consider whether  this and
    Cambridge Plating's other claims were timely brought.
    III.
    Although  the  Massachusetts legislature  has  set statutory
    limitations periods for various causes of action, see supra at 4-
    5  &  n.1, determining  when claims  accrue  "``has long  been the
    product  of judicial  interpretation,'"  Hoult v.  Hoult, 
    792 F. Supp. 143
    , 144 (D.  Mass. 1992) (quoting Franklin v.  Albert, 381
    3  The  cost of  engineering  services  to assist  Cambridge
    Plating with preparing its  local industrial discharge permit and
    meeting with  local officials -- a single item among a list of 83
    -- also was included in the equipment subtotal.
    -8-
    Mass. 611, 617, 
    411 N.E.2d 458
     (1980)).  Caselaw establishes that
    the  general  rule for  negligence claims  is  that the  cause of
    action  accrues at the  time of injury.   Riley  v. Presnell, 
    409 Mass. 239
    ,  243, 
    565 N.E.2d 780
     (1991).   Similarly, a cause  of
    action for breach of contract usually  accrues at the time of the
    breach,  International Mobiles Corp. v. Corroon & Black/Fairfield
    & Ellis, Inc., 29 Mass. App. 215, 221, 
    560 N.E.2d 122
     (1990), and
    accrual  of  a chapter  93A claim  typically  occurs at  the time
    injury  results from the assertedly unfair or deceptive acts.  29
    Mass. App. at 220-21.
    These designated  times  are subject  to  some  flexibility,
    however,  because Massachusetts  courts  have recognized  that it
    would  be  unfair to  begin  running the  statute  of limitations
    before a plaintiff is  put on notice that  she has a claim.   See
    Bowen v.  Eli Lilly  & Co.,  
    408 Mass. 204
    ,  205, 
    557 N.E.2d 739
    (1990); Anthony's Pier Four, Inc. v. Crandall Dry Dock Engineers,
    Inc.,  
    396 Mass. 818
    , 824,  
    489 N.E.2d 172
      (1986); Franklin, 381
    Mass at 619.   The judicially created tool for  ensuring fairness
    is the  "discovery rule," which provides that,  regardless of the
    actual  time of  breach or injury,  "a cause  of action  does not
    accrue  until a  plaintiff discovers,  or reasonably  should have
    discovered, that she  may have been  injured as  a result of  the
    defendant's conduct."   Hoult,  
    792 F. Supp. at 144
    .   See  also
    Riley,  
    409 Mass. at 244
    ; Bowen, 
    408 Mass. at 205-06
    ; Hendrickson
    v. Sears,  
    365 Mass. 83
    ,  83-84,  
    310 N.E.2d 131
     (1974).    The
    delayed  knowledge may be either the fact of injury, such as when
    -9-
    an item is not used and thus not discovered to be defective for a
    substantial time  after its  purchase, see, e.g.,  Anthony's Pier
    Four, Inc., 
    396 Mass. at 825-26
    ,4  or the cause of the harm, such
    as when an individual  with a physical illness does  not discover
    the illness's  link to  particular medical treatment  until years
    after becoming sick, see, e.g., Bowen, 
    408 Mass. at 207
    .5
    Not all  contractual causes  of action in  Massachusetts are
    governed  by  the  judicially  crafted  accrual  rules.    Claims
    alleging breach  of a contract for the  sale of goods instead are
    subject to the detailed provisions of the UCC.  Under   2-275(2),
    a  cause of  action  for breach  of  a sales  contract  generally
    accrues  when the  breach  occurs, "regardless  of the  aggrieved
    party's  lack  of  knowledge of  the  breach,"  and  a breach  of
    warranty occurs when tender of delivery is made.  Mass. Gen. Laws
    Ann.  ch. 106,     2-275(2).   When  a seller  gives  an explicit
    warranty of future performance, however,
    4  Anthony's  Pier Four  involved  an action  filed  in 1980
    against  the designers  of a  ship mooring  system that  had been
    completed in 1968.  The plaintiff claimed that it was  unaware of
    the system's design deficiencies  until it actually failed during
    a storm  in 1978.   The  court held that  the lawsuit  was timely
    because  "[t]he plaintiff  discovered  the breach  when the  boat
    capsized in 1978  and there  is no  showing that  it should  have
    known of the breach earlier." 
    396 Mass. at 826
    .
    5 The plaintiff  in Bowen had  suffered a malignant  vaginal
    tumor requiring surgery in 1969 but did not file suit blaming the
    cancer on a prescription drug manufactured by defendant Eli Lilly
    &  Co. until 1983.   The  court applied  the discovery  rule, but
    nevertheless determined that the plaintiff was on notice that the
    defendant may have caused  her harm more than three  years before
    filing her action.  
    408 Mass. at 210
    .
    -10-
    and discovery of the breach must await the time of such
    performance the cause of action accrues when the breach
    is or should have been discovered.
    
    Id.
      Thus, like the tort and contract causes of action subject to
    the  judicial discovery rule, a  cause of action  for breach of a
    warranty of future performance is tolled until  the plaintiff has
    adequate notice of the claim.
    The district court found that the  transaction at issue here
    was  a sale  of goods,  and that  the UCC  therefore governs  the
    contract claim.   It further determined that  Napco expressly had
    warranted  the  future performance  of  the  wastewater treatment
    system, and that, consequently, the statutory discovery provision
    applies.   Because  we  have concluded  that  the district  court
    correctly ruled as a  matter of law that the parties entered into
    a sale  of goods, and there  is no challenge to  its finding that
    Napco  gave  an  explicit  warranty of  future  performance,  the
    timeliness  of  all  of  plaintiff's  claims  is  linked  to  the
    discovery rule.
    IV.
    Our  analysis of  the discovery rule's  impact in  this case
    must  begin with the parties'  conflicting views on  how the rule
    operates.   Defendant Napco asserts that the rule applies only to
    "inherently unknowable"  causes of  action and that  the question
    before us is whether Cambridge Plating's claims were discoverable
    through  reasonably  diligent  efforts.6   If  Cambridge  Plating
    6  Although  the  dictionary  definition  suggests  that  an
    "inherently" unknowable  claim is  one that would  be permanently
    undiscoverable, see  The Random  House Dictionary of  the English
    -11-
    could  have  discovered  its claims  earlier  through  reasonable
    diligence,  Napco  maintains,  then   they  were  not  inherently
    unknowable and the discovery rule would not apply.
    Cambridge Plating  counters  that the  applicability of  the
    discovery rule does not depend on whether it was possible for the
    company  to  discover  Napco's  responsibility  for  the  defects
    earlier  by pursuing some other reasonable course of action.  The
    inquiry, it asserts, must focus on the reasonableness of what the
    company actually did.  If the company acted diligently, but still
    reasonably  failed to learn of its cause of action, the discovery
    rule would continue to delay the limitations clock.
    The  district  court  adopted  Napco's  view,  finding  that
    Cambridge Plating could have discovered the system's defects once
    the  company  learned  that  the water  treatment  equipment  was
    failing to  bring effluent discharges  within legal limits.   The
    court pointed to expert Moleux's affidavit  as evidence that "the
    defects were manifestly knowable to someone with an appropriately
    trained eye," Opinion at 10  (emphasis in original).  It  did not
    matter, the court ruled,  whether Cambridge Plating had exercised
    reasonable  diligence in  hiring the  first expert,  who did  not
    discover  the   defects:  "[w]hether   a  defect  is   inherently
    unknowable turns  not upon  an inquiry  into whether the  injured
    Language (2d  ed. 1987)  at  982, the  phrase  has been  used  to
    describe  a cause of action  that was incapable  of detection for
    some  prolonged  period  of  time   even  with  the  exercise  of
    reasonable diligence.  See,  e.g., Tagliente v. Himmer,  
    949 F.2d 1
    ,  5 (1st  Cir. 1991);  White v.  Peabody Construction  Co., 
    386 Mass. 121
    , 129  (1982); International Mobiles Corp. v.  Corroon &
    Black/Fairfield & Ellis, Inc., 29 Mass. App. 215, 222 (1990).
    -12-
    party did in fact exercise reasonable diligence, but instead upon
    an inquiry  into whether reasonable  diligence could have  led to
    discovery  of the defects," 
    id.
     at 11 n.5 (emphasis in original).
    This implies  that at least  two courses of  action would meet  a
    standard  of reasonable diligence  -- one pursued  by the injured
    party and another that could have been pursued.
    We are  persuaded that Cambridge Plating's  statement of the
    discovery   rule   is   the  one   consistent   with   prevailing
    Massachusetts law.   The rule is designed  to protect plaintiffs,
    to assure that "``a plaintiff [] be put on notice before his claim
    is barred,'" Anthony's Pier Four, Inc., 
    396 Mass. at 824
     (quoting
    Franklin, 
    381 Mass. at 619
    ).  This protection would be frustrated
    if  a  plaintiff who  remained unaware  of  his claim  even after
    conducting reasonable inquiry was  time-barred from pursuing  it.
    Fairness  dictates   that  the  discovery  rule   not  be  deemed
    inapplicable simply  because reasonable actions other  than those
    taken by the plaintiff  could have uncovered the injury  or cause
    of harm.  See  generally Franklin, 
    381 Mass. at 618
     (limitations
    statutes are intended, inter alia, to "``stimulate [plaintiffs] to
    activity'" and  "punish[]  negligent  delay")  (quoting  Wood  v.
    Carpenter, 
    101 U.S. 135
    , 139 (1879)).
    Indeed, the contrary conclusion would require something more
    than  reasonableness  on the  part  of  the plaintiff;  Cambridge
    Plating complains  that nothing  less than omniscience  would do.
    Whenever more than  one reasonable  option for  pursuing a  claim
    existed -- when, for example, two or three qualified experts were
    -13-
    available to  investigate a non-performing piece  of equipment --
    the  plaintiff would  be  penalized if  the  first expert  chosen
    reasonably failed to discover a problem the second expert managed
    to  detect.  That the  plaintiff had been  diligent in hiring the
    first expert would be  irrelevant, even though the very  point of
    the rule was to protect plaintiffs whose reasonable efforts would
    fail  to put  them on notice  of their claims.   This, certainly,
    cannot be the intent of the Massachusetts courts.
    The   formulation  that   we  believe   reflects  prevailing
    Massachusetts law was particularly well articulated in Bowen, one
    of the Supreme Judicial Court's more recent discovery rule cases:
    This  rule  prescribes  as  crucial  the  date  when  a
    plaintiff  discovers,  or  any earlier  date  when  she
    should  reasonably have  discovered, that she  has been
    harmed  or  may have  been  harmed  by the  defendant's
    conduct.
    . . .
    [T]he  statute of  limitations  starts to  run when  an
    event  or events  have  occurred that  were  reasonably
    likely to put the plaintiff on  notice that someone may
    have caused her injury.
    
    408 Mass. at 205-206, 207
    .  See  also, e.g., Riley, 
    409 Mass. at 243
    ; Franklin, 
    381 Mass. at 619
    .  Bowen makes it clear  that the
    steps taken by a plaintiff to discover her cause of action play a
    role  in the decision whether  to apply the  discovery rule: "the
    decision  whether  any  [injury]  should  reasonably   have  been
    uncovered  ha[s] to be made  in light of  what reasonable inquiry
    would have disclosed."  
    Id.
     at 206 (citing Friedman, 371 Mass. at
    485-86).  Accrual of  the plaintiff's cause of action  is tested,
    therefore, "by  what a reasonable  person in  her position  would
    -14-
    have known or  on inquiry  would have discovered  at the  various
    relevant times," Bowen, 
    408 Mass. at 210
    .
    Thus, if Cambridge Plating acted  reasonably diligently when
    it  hired the first expert,  the fact that  that expert failed to
    discover the  system's  defects must  be sufficient  to toll  the
    statute  of limitations.7    This is  so  because, if  reasonable
    inquiry  failed to disclose the  problem, it cannot  be said that
    the problem  "should reasonably have been  uncovered," Bowen, 
    408 Mass. at 206
    .8
    We recognize that the district  court's interpretation finds
    literal  support  in the  language of  a  number of  cases, which
    describe  the discovery  rule as  applicable only  to "inherently
    unknowable"  claims or refer to the time when a plaintiff "could"
    have known of his claim.   See, e.g., Melrose Hous. Auth.  v. New
    Hampshire  Ins. Co.,  
    402 Mass. 27
    , 34,  
    520 N.E.2d 493
     (1988);
    Anthony's  Pier Four, Inc., 
    396 Mass. at
    825-26  n.9; White, 
    386 Mass. at 129-30
    ; International  Mobiles Corp., 29  Mass. App. at
    7  We presume  here that  the expert  performed competently.
    See infra p.17.
    8  The district  court's  decision may  reflect an  implicit
    finding  that the  first  expert's efforts  were inadequate.   If
    Moleux's  exhaustive study of the  system would have  met but not
    surpassed the  threshold standard of reasonableness  even if done
    two years  earlier, then  Hunt's apparently less  thorough review
    would not have been sufficient inquiry under  the discovery rule.
    On  the other  hand,  if Cambridge  Plating exercised  reasonable
    diligence in hiring Hunt, and his performance was competent, then
    Moleux's efforts beyond the  reasonableness threshold should  not
    furnish a basis for  denying discovery rule protection.   On this
    record, we do not  think that the district court  could determine
    as a matter  of law  that the first  evaluation was  incompetent.
    See Section V infra.
    -15-
    222; Melrose Hous. Auth. v. New Hampshire Ins. Co., 24 Mass. App.
    207, 212,  
    507 N.E.2d 787
     (1987).   But  this support erodes  on
    analysis.
    The two cases cited  by the district court as  precedent for
    the standard it applied also refer to the "reasonably should have
    known"  formulation, see White, 
    386 Mass. at
    129  & 130; Melrose
    Hous. Auth., 24  Mass. App. at  212, as do  other cases cited  by
    Napco,  see, e.g., Anthony's Pier Four, Inc., 
    396 Mass. at
    825-26
    &  n.9;  International  Mobiles, 29  Mass.  App.  at  218 &  222.
    Moreover,  none  of  these  cases  involved  a  plaintiff  in the
    position  Cambridge Plating claims to  be in here,  i.e., one who
    acted diligently, yet still failed to learn of a cause of action.
    These  cases, instead, uniformly involve plaintiffs who were
    not diligent,  and  that circumstance,  we believe,  has led  the
    courts  to describe the rule  imprecisely.  When  a plaintiff has
    made no reasonable  efforts to  discover the harm  or its  cause,
    considering whether a plaintiff reasonably should have discovered
    his  claim will produce the same result as considering whether he
    reasonably could have  discovered it.   For example,  if a  court
    found that  a claim  could not  be discovered  through reasonable
    diligence,  it  would be  precluding as  well  a finding  that he
    reasonably  should have  discovered it.   See,  e.g.,  White, 
    386 Mass. at 130
      (in cases  cited, "the  nature of  the defendant's
    wrong was such that  the plaintiff did not discover and could not
    reasonably  have discovered that he or she had been injured until
    [a later time]").
    -16-
    Similarly,  a court  might find that,  if the  plaintiff had
    been  diligent, she could have  discovered her claim.   From this
    conclusion, lacking  contrary information, it also  is logical to
    presume  that the  plaintiff  should have  discovered her  claim.
    Having  failed to act, the  plaintiff has no  basis for disputing
    the  court's sensible  presumption that reasonable  actions would
    have produced results.   See,  e.g., Friedman  v. Jablonski,  
    371 Mass. 482
    , 486, 
    358 N.E.2d 994
      (1976); Melrose, 24 Mass. App. at
    212-215; Graveline  v. BayBank  Valley Trust  Co., 19  Mass. App.
    253,  254-55,  
    473 N.E.2d 700
      (1985).    "Could"  and "should"
    effectively are interchangeable in  this context, and the courts'
    particular usage is of no significance.
    Only when a plaintiff  has done what he  is supposed to  do,
    and still  comes  up empty,  is  a court  faced with  a  possible
    disjunction between  what he theoretically could have known if he
    had chosen a different  reasonable path, and what he  should have
    known based on the reasonable inquiry he did make.   Because none
    of  the cases  cited to  us present  that situation,  and because
    construing the rule as the district court applied it  effectively
    would  take away the protection the discovery rule is designed to
    provide, we  are confident that  Cambridge Plating's view  of the
    discovery rule is correct.
    We think it worth emphasizing  that, so construed, the  rule
    does   not  permit  a  plaintiff  to  buy  time  by  engaging  an
    incompetent "expert."  Hiring an individual  who is poorly suited
    to  investigate the type of  injury suffered by  the plaintiff is
    -17-
    unlikely to be deemed  "reasonable" inquiry sufficient to suspend
    the  limitations  period.     Moreover,  even  if  the  plaintiff
    reasonably hires a professional he believes to be  competent, but
    who fails to  discover a  defect that a  qualified expert  easily
    should  have found, the plaintiff's only recourse is likely to be
    against the deficient professional.  The discovery rule would not
    save the overlooked claim  because reasonable inquiry should have
    put the  plaintiff on notice of  it.  See Friedman,  
    371 Mass. at
    486 & n.4  (a competent lawyer  would have done title  search and
    should have discovered defect).
    The discovery rule's protection is limited in another way as
    well.  The  rule does not suspend the  running of the limitations
    period  pending confirmation  of  the plaintiff's  injury or  its
    cause, but simply  stops the  clock until the  occurrence of  "an
    event or  events .  . .  that were reasonably  likely to  put the
    plaintiff on notice  that someone  may have  caused her  injury,"
    Bowen, 
    408 Mass. at 207
     (emphasis added).  Thus,  a plaintiff who
    in the 1970s was told that her injury may have been caused by her
    mother's ingestion of DES was unable to invoke the discovery rule
    to save  the lawsuit she filed a decade later, when she felt more
    certain of the causal connection.  See 
    id. at 209-10
    .
    Applying  these principles  to the  case at  hand, Cambridge
    Plating's  ability to invoke the  discovery rule --  and thus the
    timeliness of its claims -- turns on when the company should have
    known that Napco  might be  responsible for  the water  treatment
    system's failing  performance.   In  Section  V, we  discuss  our
    -18-
    conclusion  that this question must  be answered by  the trier of
    fact.    See  Riley, 
    409 Mass. at 247-48
      (jury should  decide
    disputed issues relating to statute of limitations).
    V.
    To survive Napco's motion for summary judgment  based on the
    statute  of limitations,  Cambridge Plating  must show  a genuine
    issue of material fact as to whether it knew or should have known
    of  its claims  before June  22, 1987.9   See  Fidler v.  Eastman
    Kodak Co., 
    714 F.2d 192
    , 197-98  (1st Cir. 1983); Hoult,  
    792 F. Supp. at 145
    ; Riley, 
    409 Mass. at 244, 247
    .  No one suggests that
    Cambridge  Plating  in  fact  knew the  source  of  the  system's
    problems before  early 1989, and  the issue therefore  is whether
    there is a factual  dispute over whether the company  should have
    realized Napco's possible responsibility before that date.
    A  careful analysis of the  record persuades us  that such a
    dispute  exists.  In finding that Cambridge Plating was on notice
    of its claims in late 1985, the district court  relied heavily on
    the company's having  learned at  that time that  the system  was
    failing to  bring effluent discharges down  to acceptable levels.
    The  court  felt  that   Cambridge  Plating's  knowledge  of  the
    deficiencies meant that it knew that the performance warranty was
    being breached.  Additionally,  consistent with its understanding
    9  The lawsuit was filed on June  22, 1990.  As discussed in
    Section III,  supra, certain of the claims have four-year, rather
    than three-year,  statutes of limitation, and  those claims would
    be  timely even  if  Cambridge Plating  learned  of them  a  year
    earlier, in  1986.  For the sake  of simplicity, because it makes
    no  difference in  the result,  we discuss the  claims as  if all
    needed to be filed within three years of their discovery.
    -19-
    of the discovery rule, see Section IV 
    supra,
     the court ruled that
    Cambridge Plating was then on notice of the other claims as well.
    The system's inadequate performance  in late 1985 strikes us
    as  far less portentous.  Beyond doubt, when the system first was
    installed,  and throughout  Napco's debugging  process, Cambridge
    Plating had no reason to suspect the serious flaws.   Omission of
    the  static  mixer  was virtually  impossible  for  anyone but  a
    wastewater treatment expert to  discover, both because the device
    was  supposed to  be located  inside a  pipe and  because Napco's
    diagrams  indicated that  it had been  installed.   Moreover, any
    deficiencies presumably  were to be resolved  once Napco finished
    its finetuning.
    When  the  problems persisted  despite  Napco's announcement
    that debugging  was complete, two explanations theoretically were
    available.  Either  the system  itself was defective,  or it  was
    being  operated  improperly.   At  this point,  however,  the two
    possibilities were not equally  weighted.  Cambridge Plating knew
    that the  system was  technically complex and  required sensitive
    operation.   And  Napco's  only response  to Cambridge  Plating's
    inquiries was to suggest ways to improve operation.
    In these circumstances, we  do not believe Massachusetts law
    requires  a finding that Cambridge  Plating was on  notice of the
    system's defects.  A plaintiff is sufficiently aware of her cause
    of  action,  and thus  should have  discovered  it, once  she has
    received  "notice  of  likely cause,"  Fidler,  
    714 F.2d at 199
    (quoted  in  Bowen, 
    408 Mass. at 207-08
    ).   Accordingly,  as we
    -20-
    understand the requisite notice,  the statute of limitations will
    begin  to run once the plaintiff has enough information to target
    the defendant  as a suspect,  though not necessarily  to identify
    the  defendant as the culprit.   See Bowen,  
    408 Mass. at 207-08
    .
    We think it within  a factfinder's province to conclude  that, in
    late 1985,  Cambridge Plating had no basis for suspecting Napco's
    workmanship  and  reasonably  attributed  the  system's  problems
    solely to  its own deficient  operation.   If so, the  statute of
    limitations would not yet have begun to run.10
    Cambridge  Plating  hired new  operators,  but  the problems
    persisted.    So, in  late 1986,  the  company engaged  its first
    expert evaluation of  the system.   This, too,  resulted in  only
    operational suggestions.  Should  this expert have discovered the
    defects?   Again, we believe this is a question properly answered
    by the trier  of fact.   The record  contains little  information
    about  the  first expert,  describing  him only  as  an assistant
    instructor  for  a wastewater  treatment  course  at a  community
    college who "worked on waste treatment for Hewlett Packard."  See
    Affidavit of Edward Marullo, at 2.   Was he competent to evaluate
    the  system?  Would even a well qualified expert necessarily have
    uncovered the problem based on what  he knew about the system  at
    10  The facts here contrast  with those in  White v. Peabody
    Construction Co.,  
    386 Mass. 121
     (1982),  where plaintiffs sought
    to  recover damages  resulting  from widespread  window and  roof
    leaks  allegedly  caused  by  defendants'   improper  design  and
    construction  of   a  housing   project.    The   court  rejected
    application of  the discovery  rule there because  the plaintiffs
    "reasonably should  have known that  widespread water leaks  in a
    newly  constructed building  are almost  certainly the  result of
    design or construction defects."  
    Id. at 130
    .
    -21-
    that point?  Was it reasonable to rely on the schematics provided
    by Napco showing that a static mixer had been installed?  Perhaps
    the  second expert discovered the defects  only because, in light
    of the earlier  expert's reasonable work, a more exhaustive study
    now appeared necessary.11
    Because   the   record   leaves  these   subsidiary   issues
    unresolved,  factual  questions  remain as  to  whether Cambridge
    Plating should  have known  even by  the end  of 1986  of Napco's
    possible  responsibility  for  the  system's failings.    If  the
    expert's failure  to discover the defects was  reasonable, a jury
    could find that Cambridge Plating continued to deserve protection
    from the discovery rule beyond that time.12
    Whether  the rule's  impact, assuming  it reached  this far,
    continued  on  through the  time of  actual  discovery is  also a
    matter  for jury deliberation.  Was it reasonable for the company
    to  wait another two years before seeking additional advice?  Was
    there a point in  time after Cambridge Plating had  complied with
    all of the  first expert's suggestions, still  without any change
    in the  system's performance, that the  company reasonably should
    have realized that Napco's work may have been to blame?
    11 An affidavit from the second expert, Peter Moleux, states
    that, in his opinion, "the defects in the system  could have been
    discovered  only by someone  with expertise  and training  in the
    field  similar  to mine  and only  after  a lengthy  and thorough
    inspection and analysis."  See App. at 179   33.  Moleux reported
    that he spent "many days" identifying the system's problems.
    12  Of  course,  claims  subject  to  four-year  limitations
    periods  would be timely even  if the discovery  rule only tolled
    the running of the clock through the end of 1986.
    -22-
    In  short,  many  questions   remain.    To  determine  when
    Cambridge  Plating "reasonably  should have  discovered" that  it
    might have  claims against Napco  requires a  review of  specific
    circumstances  about which the  record presently contains sketchy
    information.  Consequently, the district court's grant of summary
    judgment must be set aside.13
    Reversed and remanded. No costs.
    13  We  are unpersuaded  by Cambridge  Plating's alternative
    theories  that  the  statutes   were  tolled  because  (1)  Napco
    concealed  omission of  the  static mixer  and  (2) Napco  had  a
    fiduciary duty to disclose the omission but failed to do so.  See
    generally White v. Peabody Construction Co., Inc., 
    386 Mass. 121
    ,
    133-34 (1982).
    -23-