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do not expect vapors be present. <br /> o Excavated dirt will be placed on visqueen sheets or in <br /> trucks and covered. It will be removed by Chevron the same <br /> day. <br /> o Excavations will be backfilled and resurfaced appropriately. <br /> This includes repaving disrupted streets and sidewalks and <br /> replacing the sod over the park and front yard excavations. <br /> All work will be carried out as expediently as possible to minimize <br /> disruptions of excavating in a residential area. Any excavations <br /> that must be left overnight will be isolated and covered with a <br /> heavy steel plate. Traffic near the seeps on Palm Circle will be <br /> reduced to one lane (east side of street) while work on the seeps <br /> is taking place. <br /> Seep Collection Vault <br /> A seep collection vault will be installed where soil cores indicate <br /> a deep source of oil and at the seep in the park. The collection <br /> vaults will ensure the surface seeps do not return before a general <br /> cleanup system (such as soil venting) can remove the source of oil. <br /> The collection system for a seep is shown on Plate 11. The seep is <br /> first excavated to a 2-4 foot depth as described above. Before it <br /> is backfilled, however, an underground vault (e.g. a corrugated <br /> metal pipe with a manhole cover) will be installed in the <br /> excavation where the seep used to exist. The covered vault will <br /> have perforations and be surrounded by a layer of gravel. The <br /> vault lid will be locked. With this system a "controlled seep" <br /> will collect in the isolated vault and be periodically removed by <br /> Chevron. <br /> All collection vaults will be removed by Chevron when the source of <br /> the seeps has been treated and the seepage stops. The affected <br /> areas will be resurfaced appropriately to return them to their <br /> original state. <br /> HEALTH AND SAFETY PRECAUTIONS <br /> All work at the site during which personnel may encounter oily soil <br /> or subsurface vapors will be carried out in accordance with health <br /> and safety plans prepared by the contractor performing the task. <br /> The plans will be similar in scope to the plan submitted in <br /> Appendex A, which is an amended version of the Health and Safety <br /> Plan submitted by Dames & Moore for the site assessment study. All <br /> plans will be reviewed by Chevron for their completeness. <br /> Contractor' s personnel will be expected to carry out all provisions <br /> of their health and safety plan. Failure to do so will be <br /> sufficient cause for Chevron or the City of Tracy to suspend work <br /> at the site until provisions are met. <br /> Gen <br /> eralroce <br /> p dures to be followed include: <br /> 11 <br />