WORK PLANS - Laserfiche WebLink

Home Browse Search

-4- 4 . 3 Suspected Hazards The oil at the site is a mixture of heavy (high boiling range) hydrocarbons and possibly a cutter similar to kerosene (added to make the oil more fluid) . Methane may also be present below grade as a result of anaerobic biodegradation. General informa- tion on heavy oils and methane gas is presented in attached Material Safety Data Sheets (MSDS ' s ) . Exposure standards, physi- ological and health effects, and special protection information are included in the MSDS ' s . Organic vapor levels are expected to be between 0 and 200 ppm immediately above subgrade excavations (based on Dames and Moore ' s vapor assessment in uncapped wells) and undetectable otherwise. The natural ventilation associated with outdoor acti- vity is expected to keep airborne concentrations of organics well below levels of concern. 5. 0 Monitoring/Respiratory Protection All below grade activities will be monitored for organic vapors. Monitoring equipment (e.g. , OVA, HNu) will be used to detect organic vapor concentrations and/or explosive hydrocarbon mix- tures. If sustained conditions of greater than 200 ppm hydrocar- bon* are discovered in the worker ' s breathing zone, work will be suspended until proper ventilation or respiratory equipment pro- tect personnel from prolonged exposure. The SSO is responsible for ensuring proper procedures are followed. 6. 0 Emergency Contacts/Procedures 6 .1 Contacts This section lists the responsible parties that should be con- tacted in the event of an unexpected situation or emergency at the site. Chevron ' s contacts should also be notified of any gen- eral problems arising from our work (e.g. , excessive noise, odors, unnecessary disruption of traffic, etc. ) . *Eight-hour exposure limit.