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Di Salvo Truck Lines-OEXWP June 21, Page-4 -4- measurements.' Remediation arid/or disposal options for hydrocarbon impacted soil;will be evaluated Y. following completion of the over-excavation 3.2 Over-excavation G Prior to over-excavation of petroleum contaminated soil, a tailgate safetyn eeting will be held and yr a site-specific health and safety plan will be discussed-with, and presented to, all crew members for their.' signature prior to commencement of work. A copy of the,health and safety_plan is contained in Appendix B. _ - Over-excavation will..begln at the.south end-of-the former location of TK1 and proceed to a total depth of approximately 21_feet bgs. Groundwater.will then be allowed_to.stabilize-and a groundwater. - sample will be collected.from the open excavatien Groundwater was encountered-at the site - approximately 12 feet.bgs'in January, 1995, The groundwater sample will-be analyzed and the results of ._ the analyses will be submitted to the City of Stockton:Municipal Utilities Department (CS for- . _ approval to discharge the water to the water treatment facility. If water.is above CSMLJD discharge requirements, an'onsite pre-treatment-system will be.installed to reduce hydrocarbon levels. Upon approval from C SMUD to discharge^groundwater;-groundwater will be pumped:from.the excavation to-a.. [ storage vessel until the water`level is at or.near the floor of the open excavation. Thewater.contained. in . [, the storage vessel will be transported by truck to the water.treatmeriffacility.. a _ _ A Condor geologist will monitor the over-excavation and screen the excavated:soil using_an organic vapor analyzer (OVA) The hydrocarbon detection limit for the OVA is approximately_1.0-part _per million.. The over-excavation will proceed vertically"until"field observations and OVA-readings indicate no physical evidence.of hydrocarbon contamination ls.preseiit or the limit of the excavation equipment has been reached. -The'lateral extent of the over-excavation will proceed until field observations and OVA readings indicate no physical evidence of hydrocarbon contamination is present or the physical:limits of the site have been reached Soil`samples will:be collected from the excavation' sidewalIs to confirm field observations and OVA readings 3.3 Sampling-Methods T Soil samples will be collected from the floor and sidewalls of.the over excavation using a remote, sampling tool. If access to the desired.soil sample location isnot feasible using the remote sampling tool, the soil samples will be' collected,from the excavator bucket. Condor estimates a total of.$ to 10 soil_. L� - _ CONDOR