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Work Plan for Soil Excavation 3 The Southland Co Store#20304 455 Grant Line Road CA Janua 26 1998 The document will be reviewed and signed by all Fluor Daniel GTI personnel and subcontractors performing work at the site An excavation permit will be applied for,if needed,through the SJCPHS prior to conducting the on-site activities In addition,the Stockton Fre Department will be notified of the activity,so that personnel can be onsite to witness the excavation,if necessary TASK 2. SCOPE OF WORK Pre-Excavation Activities Subsurface utilities well be located and marked pnor to conducting subsurface activities Temporary fencing will be put up along the southern side of the store at the sidewalk,the property line on Buthman Avenue,and Grant Line Road to prevent pedestrian traffic from entering the excavation area (Figure 2) Shoring of the excavation walls will not be required given the shallow depth of impacted sod, and the silty clay stratigraphy from 0 to 5 feet BGS, below the 4-inch-thick asphalt cap Groundwater is expected at approximately 5 feet BGS A vacuum truck company will be contracted to evacuate,transport and dispose of the exposed groundwater during the excavation Groundwater recharge has been estimated at greater than 20 gallons per minute Fourth quarter groundwater sample analytical results well be used for characterization of the water prior to treatment and disposal Soil Excavation and Sampling Fluor Daniel GTI personnel will supervise the excavation of sod in areas that have historically contained elevated concentrations of petroleum hydrocarbons The expected area of highest concentration In soil will be excavated as shown on Figure 2 The estimated size of the main source area is based on data collected during past soil and groundwater assessment and historical groundwater mondonng sampling Sod samples at the lateral and vertical limits of the excavation will be collected in 2-Inch-diameter by 6- inch-long brass tubes directly from the bucket of the excavator All samples will be capped,labeled, placed on Ice,and transported under chain-of-custody to a state-certified laboratory for analysts of benzene,toluene,ethylbenzene and xylenes(BTEX),total petroleum hydrocarbons-asgasollne(TPH-G) by Environmental Protection Agency(EPA) methods 8020/8015 modified,and oxygenates methyl-tert butyl-ether(MTBE),tert butanol (TBA),d0sopropyl ether(DIPS),ethyl-tert-butyl-ether(ETBE),and tart amyl-methyl-ether(TAME) by EPA method 8260 Field phototonization detector(PID) readings of soil vapors will be recorded to document the relative hydrocarbon content of the soil during excavation as a qualitative method for determination of the limits of excavation The final lateral extent and depth of the excavation will be measured and sketched on a site 045~LTR SOUTHLAND FLUOR DANIEL GTI