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KLEINFELDER • 1 EXECUTIVE SUMMARY This is a report of Klennfelder's soil assessment conducted at the Independent Trucking Company (ITC) facility located at 1145 West Charter Way in Stockton, California ITC retained Kleinfelder to assess the potential presence of petroleum hydrocarbons in the soil surrounding two 10,000-gallon aboveground storage tanks One tank has been moved by ITC, and the other is still in place On August 29 and 30, 1995, Kleinfelder drilled six borings around and through the tank area ' Soil samples were collected at 5 foot intervals from the six borings and at the ground surface adjacent to each borehole for laboratory analysis Concentrations of total petroleum hydrocarbons (TPH) as diesel were reported in angled boring AB-3 at depths of 5 (500 mg/kg) and 10 feet (3,900 mg/kg) TPH concentrations were also reported in VB-2 at 22 mg/kg at a depth of 25 feet The petroleum hydrocarbons detected in boring AB-3 appear to be diesel associated with operation of the former aboveground storage tanks (AGST) Since TPH concentrations were not detected in soil samples collected from VB-2 above 25 feet, the Mconcentrations reported may be due to migration of TPH in groundwater from a nearby source or vadose zone transport Surface samples collected adjacent to each boring also were impacted with TPH concentrations ranging from 22 to 3,400 mg/kg This surface soil may have been impacted by surface spillage from the AGSTs or oils applied for dust control rBased on the TPH concentration reported in samples collected from AB-3, the soil in this area should be excavated and remediated, or disposed of at an appropriate waste disposal facility Surface soil which has been impacted with TPH should also be excavated at this time and disposed of along with soil in the vicinity of AB-3 In order to obtain site closure from the California Regional Water Quality Control Board ' (RWQCB), confirmation soil samples will need to be collected from the excavation sidewalls and bottom, and analyzed for TPH extractable If any impacted soil is to remain in place, a waste extraction test (WET) should be conducted to assess leachability and evaluate potential impact to groundwater Groundwater was not encountered during the drilling program, but is estimated to be at a depth of 30 feet in this area Kleinfelder does not recommend additional assessment or further remediation of soil in the vicinity of VB-2, where only 22 mg/kg of TPH were detected at . depth ' 23-482276-AOO/TR950096 Page ! of 12 October 19, 1995 Copyright 1995 Kleinfelder,Inc