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' FIELD WORK METHODS AND PROCEDURES <br /> 1.4 STEE HEALTH AND SAFETY <br /> Work at the site was performed according to Delta's Site Health and Safety Pian that describes bask <br /> ' safety requirements for the drilling of the soil borings and associated sampling at the work site The <br /> safety plan was available to personnel of Delta and to Delta's subcontractors The Delta geologist on-site <br /> ' performed the duties of Site Safety Officer Personnel at the site were informed of the contents of the <br /> Site Health and Safety Plan before work began A copy of the plan was kept on-site and available for <br /> reference by appropriate parties at all tunes during the work <br /> 2.0 RINSING AND CLEANING OF TANKS <br /> Erickson Inc of Richmond, California was subcontracted by Unocal to triple-rinse each tank and the <br /> associated Imes prior to removal The rmseate liquid was removed from the tanks by Erickson, and <br /> hauled under manifest to Gibson Od/Piiot Petroleum in Redwood City, California for disposal A copy <br /> of the manifest is presented in Appendix A <br /> 3.0 UNDERGROUND SERVICE ALERT �Q_T_IF_ICATI2N <br /> Underground Services Alert (USA) was notified by Delta 48 hours prior to commencing drilling, to <br /> delineate the location of public utility lines at the site. Delta, with the assistance of Valenzuela <br /> Engineering staff familiar with the site, marked the Iimits of each tank location and proposed soil boring <br /> locations prior to notifying USA. <br /> ' 4.0 EXCAVATION SOIL SAMPLE COLLECTION <br /> ' Soil samples collected at depths in excess of five feet below surface grade were collected using the on-site <br /> excavator Soil from sidewalls or the bottom of excavations was collected using the excavator and <br /> ' brought up to the surface. A brass tube was then driven into the soil and capped with teflon and plastic <br /> caps Samples were then labeled and stored on ice for transport to Sequoia <br /> 5.0 GEOPROBE SAMPLING PROTO!COL <br /> ' Soil sampling was performed under the direction of a Delta geologist Geoprobe soil borings were <br /> advanced using a truck-mounted, hydraulically-powered, soil probing machine that utilizes static force <br /> and percussion to advance small diameter sampling tools in the subsurface Soil samples were collected <br /> ' from each boring at the sampling interval or at the discretion of the geologist <br /> RYr16o its <br />