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December 22, 1998 41017 002 Harding Lawson Associates Mr Michael Kith PHS/EHD Page 3 ' UST A total of approximately 94,383 gallons of residual liquids and sludge %N ere removed from the UST by vacuum trucks operated by Universal Environmental, of Benicia, California, a Iicensed and registered hauler (Hauler Registration 43240) These residuals were transported in accordance with environmental and ' transportation regulations and laws, to Seaport, a permitted Treatment, Storage, and Disposal (TSD) Facility, located in Redwood City, California Following removal of the residual UST contents and the remaining portions of the roof, the steam piping withm the UST was disassembled and then decontaminated within the UST by steam cleaning with a 3,000 PSI steam cleaner with rotating Jet nozzles and Hotsy Ripper II detergent Rinseate from this process was contained within the UST, removed by vacuum tracks, and transported by Universal Environmental to the Seaport TSD facility, located in Redwood City, California Following the removal of the steam piping, the concrete sidewalls and bottom were decontaminated as described above This was done at least three times to achieve tnple ' rinsing This nnseate was also contained within the UST, removed by vacuum trucks, and transported by Universal Environmental to the Seaport TSD in Redwood City, California On the morning of July 9, 1998, Mr Michael Kith of the PHS/EHD inspected the cleaned sidewalls and bottom of the UST (staff of the City of ' Stockton Fire Prevention District declined to attend) Mr Kith found the decontamination procedure to be acceptable, and allowed Ogiso to proceed with breaking-up and stockpiling of the concrete sidewalls and bottom An appointment was made with Mr Kith of the PHS/EHD to observe the UST removal sampling for the afternoon of July 9, 1998 The removal of the UST sidewalls and bottom had been completed about halfivay by the afternoon of July 9'i' ' when the PHS/EHD arrived for sampling operations Upon arrival at the Site, Mr Kith of the PHS/EHD observed a rim of apparently impacted soils adjacent to the former side«all in the areas where the sidewalls had been removed The impacted soils (exhibiting moderate hydrocarbon odors and dark discoloration of the normally medium brow-ii-colored silty clay)were observed only in a narrow (approximately one to two feet wide), discontinuous band adjacent to the UST sidewalls Apparently clean soils were observed over the exposed bottom of the southern half of the UST excavation Mr Kith indicated that before any overexcavation of impacted soils could proceed, a work plan would be required to be approved by the PHS/EHD Site Mitigation Group prior to performing any overexcavatcon Initial soil samples were collected on July 9, 1998 at the direction of Mr Michael Kith of the PHS/EHD The ' locations of the soil samples are shown on Plate 3 Samples were collected in clean 6-inch long by 2-inch wide brass sample tubes from the excavator bucket The sample tubes «ere pounded into the soil in the bucket with a rubber mallet Soil samples were immediately sealed with plastic end-caps and tape, labeled, and placed in an ' ice-chilled cooler for transport to a state-certified analytical laborator} Samples were recorded on a standard HLA chain-of-custody form to document sample identification and handling Three soil samples (T-1, T-2, and T-3)were collected from the apparently impacted soils that were to be excavated following approval of the ' Work Plan for Limited Overexcavation and Sampling, (HLA, 1998d) These three samples were therefore not representative of soils that were to remain place Soil sample T-4 was collected from soil that had been beneath the concrete bottom of the UST in the southern portion of the excavation Four discrete soil samples were collected from stockpiled soils adjacent to the excavation that were potentially to be used in backfilling the excavation After collection of these samples, Mr Kith of the PHS/EHD agreed that upon approval of the work plan, the remaining UST removal samples and the confirmation samples following overexcavation, would be collected at the same time at the direction of PHS/EHD staff