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Occupational Safety and Health Administration OSHA

Inspection Detail

Inspection: 307391110 - Schram Construction, Inc.

Inspection Information - Office: Ca San Francisco

Nr: 307391110Report ID: 0950611Open Date: 10/15/2004

Schram Construction, Inc.
1701 Jerrold Avenue
San Francisco, CA 94124
Union Status: Union
SIC: 1711/Plumbing, Heating and Air-Conditioning
NAICS: 236210/Industrial Building Construction
Mailing: 3162 Regional Parkway, Santa Rosa, CA 95403

Inspection Type:Accident
Scope:Partial Advanced Notice:N
Ownership:Private
Safety/Health:Health Close Conference:03/17/2005
Emphasis: S:Construction (Cship)Close Case:03/29/2011

Related Activity:TypeIDSafetyHealth
 Accident362191629    

Violation Summary
Serious Willful Repeat Other Unclass Total
Initial Violations 3 1 4
Current Violations 3 1 4
Initial Penalty $10,125 $0 $0 $225 $0 $10,350
Current Penalty $1,950 $0 $0 $150 $0 $2,100
FTA Amount $0 $0 $0 $0 $0 $0

Violation Items
# ID Type Standard Issuance Abate Curr$ Init$ Fta$ Contest LastEvent
  1. 01001 Other 3203 A04 03/21/2005 04/23/2005 $150 $225 $0 04/11/2005 F - Formal Settlement
  2. 02001 Serious 3314 B 03/21/2005 03/31/2005 $1,350 $2,025 $0 04/11/2005 F - Formal Settlement
  3. 03001 Serious 5166 B 03/21/2005 03/31/2005 $300 $4,050 $0 04/11/2005 F - Formal Settlement
  4. 04001 Serious 5416 C 03/21/2005 03/31/2005 $300 $4,050 $0 04/11/2005 F - Formal Settlement

Accident Investigation Summary
Summary Nr: 201182409Event: 10/15/2004Two Employees Injured In Methane Explosion
At approximately 9:30 a.m. on October 15, 2004, Employee #1 and Employee #2 were on top of hopper Number 2, one of four 26-ft-diameter, 18.5-ft high hoppers incorporated into building 860. They were replacing metal covers on the screw conveyor housings. The conveyors fed post-digester-centrifuged sewage cake into the hoppers. The conveyor housings were located on top of the hoppers and shared the same atmosphere with the hoppers. No obstruction existed at the 2- by-3-ft opening between the housing and hopper spaces. Employee #1 was cutting through one of the metal housing covers with a Dewalt heavy duty small angle grinder and a SAIT Type 27 grinding pad. The cut was being made above the opening to the hopper. The hopper and housing exploded, throwing pieces of the tank such as guardrails and a manhole cover. Employee #1 and Employee #2 were both thrown horizontally several feet but managed to avoid falling off the tank. The contractor's foreman and superintendent were on the ground below the tank and were also thrown several feet. Although heavy debris was thrown onto the ground, no one on the ground was hit. Employee #1 and Employee #2 both received bruises, contusions, and abrasions.
Keywords: struck against, natural gas, gas, explosion, manhole, tank, tower, contusion
Inspection Degree Nature Occupation
1 307391110 Non Hospitalized injury Bruise/Contus/Abras Laborers, except construction
2 307391110 Non Hospitalized injury Bruise/Contus/Abras Laborers, except construction

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