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Work Plan for Soil Excavation/Additional Assessment 2 <br /> Barbara Drake,26485 North Thornton Rd.,Thornton, CA October 6, 1994 <br /> TASK 1: SITE-SPECIFIC HEALTH AND SAFETY PLAN/BACKGROUND REVIEW/ <br /> PERMITTING <br /> A site-specific Health and Safety Plan will be prepared by Groundwater Technology as required by <br /> the Occupational Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations <br /> and Emergency Response" guidelines (29 CFR 1910.120). The document will be reviewed and <br /> signed by all Groundwater Technology personnel and subcontractors performing work at the site. <br /> Groundwater Technology has conducted a technical review of the pertinent information associated <br /> with the site. Permits for well installation will be obtained from the San Joaquin County Public <br /> f; Health Services - Environmental Health Division (SJC;PHS-EHD). <br /> TASK 2: SOIL EXCAVATION <br /> Based on data collected during previous environmental investigations at the site (Wallace-Kuhl and <br /> Associates, 1994) Groundwater Technology will supervise the excavation of hydrocarbon-impacted <br /> soil in and around the former UST cavity, piping and dispenser island areas as delineated by <br /> previous trenching at the site. Soil will be screened for hydrocarbons by the field geologist using a <br /> photo-ionization detector (PID) and visual observation. <br /> Confir oil sJamples will be collected from the bottom and sidewalls of the final excavation. <br /> Coll samples will be collected by filling brass samples tubes from soil collected in the excavator <br /> bucket or by using an impact sampler. Upon receipt of confirmatory analytical results, the <br /> excavation will be backfilled with clean, fill material with a compaction of at least 95 percent. <br /> TASK 3: WELLHEAD SURVEY <br /> To determine the groundwater flow direction prior to conducting additional soil and groundwater <br /> sampling at the site, Groundwater Technology personnel will conduct a level survey of the existing <br /> groundwater monitoring wellheads to determine their elevation relative to an arbitrary datum. Top of <br /> tcasing elevations will be determined to within 0,01 foot. The wellhead elevations will be combined <br /> CEJ �f!` /with depth to water measurements collected during quarterly groundwater monitoring and sampling <br /> � ` ►to events to determine the magnitude and direction of the hydraulic gradient in shallow groundwater at <br /> N the site. <br /> 0053SOA.wKP(MISC-75) <br /> E�GROUNDWATER <br /> GIEJ TECHNOLOGY " <br />