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Occupational Safety and Health Administration OSHA

Inspection Detail

Inspection: 111988788 - Superior Ready Mix Concrete

Inspection Information - Office: Ca San Diego

Nr: 111988788Report ID: 0950632Open Date: 06/23/1993

Superior Ready Mix Concrete
2683 Oleander Ave
Vista, CA 92083
Union Status: NonUnion
SIC: 3273/Ready-Mixed Concrete
Mailing: 1508 Mission Rd, Escondido, CA 92029

Inspection Type:Accident
Scope:Partial Advanced Notice:N
Safety/Health:Health Close Conference:12/16/1993
Close Case:05/08/1995

Related Activity:TypeIDSafetyHealth

Violation Summary
Serious Willful Repeat Other Unclass Total
Initial Violations 5 1 6
Current Violations 1 4 5
Initial Penalty $10,000 $0 $0 $250 $0 $10,250
Current Penalty $1,250 $0 $0 $1,750 $0 $3,000
FTA Amount $0 $0 $0 $0 $0 $0

Violation Items
# ID Type Standard Issuance Abate Curr$ Init$ Fta$ Contest LastEvent
  1. 01001 Other 3203 A03 12/16/1993 01/15/1994 $250 $250 $0 01/31/1994 W - Empr Withdrew
  2. 02001 Other 3328 C 12/16/1993 01/15/1994 $500 $2,500 $0 01/31/1994 J - ALJ Decision
  3. 03001 Other 3328 G 12/16/1993 01/15/1993 $500 $2,500 $0 01/31/1994 J - ALJ Decision
Deleted 4. 04001 Serious 3310 D 12/16/1993 01/15/1994 $2,500 $2,500 $0 01/31/1994 J - ALJ Decision
  5. 05001 Serious 3328 E 12/16/1993 01/15/1994 $1,250 $1,250 $0 01/31/1994 W - Empr Withdrew
  6. 06001 Other 3203 A06 12/16/1993 01/15/1994 $500 $1,250 $0 01/31/1994 J - ALJ Decision

Accident Investigation Summary
Summary Nr: 170359608Event: 04/05/1993Employee Suffers Acute Exposure To Portland Cement Dust
The accident site was the Vista (concrete) batch plant. At about 8:00 a.m. on April 5, 1993, a cement-storage silo with a defective pressure relief device was being filled with cement powder by compressed air transport from a powder truck. The indicator alarm system that warns of overfilling the silo was inoperative. Furthermore, a rope system that indicates the level of cement in the silo was either jammed or was misinterpreted by the powder truck driver who proceeded to fill the silo. Consequently, the silo was overfilled with pressurized cement powder that blew away an unsecured hatch cover of the silo and created a large dense cloud of cement dust. This dust cloud engulfed a mixer truck driver, Employee #1, who was located near the base of the silo in her truck. Employee #1 suffered a delayed, disabling, and chronic respiratory illness from the acute and severe exposure to Portland cement dust.
Keywords: respiratory, cement powder, hatch, work rules, alarm, overloaded, inhalation, air contamination, dust inhalation, pressure release
Inspection Degree Nature Occupation
1 111988788 Hospitalized injury Other Miscellaneous material moving equipment operators
2 111988788 Occupation Not Listed

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