COMPLIANCE INFO_FILE 8 - Laserfiche WebLink

Home Browse Search

ARCADIS Mr. Steven W. Meeks October 6, 2011 Health and Safety ARCADIS will modify the existing site-specific Health and Safety Plan for this scope of work as required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120). The document will be reviewed and signed by ARCADIS personnel and subcontractors performing work at the Site. Additionally, staff performing work at the Site will have the approved "e-Rail, General Contractor Orientation, and Federal Rail Association"training certificates. ARCADIS will coordinate with UPRR to provide track protection where appropriate. Field Activities Methods and Procedures The 86 selected groundwater monitoring and remediation wells (Table 1) will be destroyed by a California C-57 licensed driller in accordance with requirements in the San Joaquin County Well Standards, dated February 2005. Supervision will be provided by ARCACIS personnel. Observations during well destruction activities will be recorded on a Well Destruction Log (Attachment 1)for each well. Well Gauging At each well location, the well depth will be gauged and compared to the existing well construction information summarized in Table 1. If debris is present in a well, it will be removed prior to well destruction activities, if possible. Well Destruction by Pressure Grouting The casing will be left in place for 56 wells (see Table 1)to be destroyed using pressure grouting technique. For these wells, the surface flush well box and/or standpipe will be removed and neat cement grout will be pumped under pressure into the well casing via a tremie pipe placed near the bottom of the well and raised as the grouting progresses. The grout will be pressurized to be forced into the formation. The grout volume placed will be calculated to confirm it exceeds the casing volume being destroyed. Concrete well vaults will be left in place if located on UPRR property but these structures will be removed from off-site properties. Following pressure grouting activities, an excavation with a diameter4arger than the well casing diameter will extend to a depth of approximately three feet below ground surface (bgs). The well casing will be cut and removed from the excavation and additional grout will be added to well casing to overflow into the excavation for creating Page: tracyca_maintfacil welldestwp(10-0&11).doc 3/5