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• S E C ® R Ms. Devra Lewis April 15, 2004 Page 8 the excavated surface of the parking lot will be re-paved with asphalt. Pipelines that are inaccessible to excavation due to being underneath buildings (remediation compound, ect), will be rinsed, filled with cement grout, sealed with bentonite, and backfilled with clean imported soil. Locating Pipeline on Former Edison Avenue and Pipeline End Inspection. The former abandoned pipeline along Former Edison Street (the first eastern entrance to Delta Gateway Apartments) will be located using metal detectors and/or ground penetrating radar. After the termination of the pipeline is located, the area will be potholed with an air knife to expose the end. If the end is not located during the initial pothole, a private utility locator will connect a radio transmitter onto the pipe, locate the trend of the pipe, and additional potholes will be performed to locate the ends of the piping. Potholes will be filled with clean imported soil and capped with cold patch asphalt. If one or both of the ends are located, the pipe will be inspected to ensure it was properly capped. Soil Excavation. During pipeline removal on the Parcel 2A property, petroleum hydrocarbon impacted soil will be over-excavated horizontally and vertically until field measurements obtained with a photo ionization detector (PID) are below 50 parts per million (ppm) or to a maximum depth of ten feet bgs. Soil Selection and Analysis. Confirmation soil samples will be collected at every 50 linear feet of pipeline or pipeline group runs at the bottom and sidewalls of the excavations. Soil samples will be collected from the bucket of the backhoe tractor and all soil samples for chemical analysis will be retained in brass liners, capped with Teflon squares and plastic end caps, and sealed in clean zip- lock bags. The samples will be placed on ice for transport to the laboratory accompanied by chain- of-custody documentation. Soil samples will be analyzed for the following: TPHd and TPHmo by EPA Method 8015M; TPHg and VOCs including fuel oxygenates by EPA Method 8260; SVOCs by EPA Method 8270; and total metals by EPA Method 6010. Additionally, two blind duplicate samples will A collected for laboratory QA/QC purposes. Soil Pre-Characterization. Prior to excavation activities, five composite (four to one) soil samples will be collected at depths of approximately three to five feet in the areas that will be excavated. Composite soil samples will be sent under chain-of-custody procedures to a California State-certified laboratory. Soil samples will be analyzed for the following: total petroleum hydrocarbons as diesel (TPHd) and total petroleum hydrocarbons as motor oil (TPHmo) by EPA Method 8015M; total petroleum hydrocarbons as gasoline (TPHg) and volatile organic compounds (VOCs) including fuel oxygenates by EPA Method 8260; semi-volatile organic compounds (SVOCs) by EPA Method 8270; and total metals by EPA Method 6010. The soil will be profiled prior to disposal at an appropriate facility. Soil Disposal. Excavated soil will be loaded into dump trucks, covered, and transported to an appropriate disposal facility based on the soil profile. A decon area will be set-up with plastic sheeting below the trucks and the trucks will be inspected for soil that may fall off of during transportation and will be cleaned if necessary to ensure soil is not tracked onto public streets. The truck decon area may be moved to different parts of the site depending on the location of the excavations. Back Fill of Excavations. Imported clean fill will be placed in each excavation. Due to the concentrations of metals that have been detected in the vicinity of the pipelines, the imported fill will be sampled and analyzed for metals by EPA Method 6010 prior to backfilling to ensure that additional metals are not introduced to the site. Stockton Parcel 2A:Work Plan for Pipeline Abandonment,Removal,and Soil Excavation and SVE Well Install