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. Analysis of soil samples collected by Parker revealed excavated and in-situ soil impacted with petroleum hydrocarbons On October 22, 1992, MARK was requested by NORCAL and SSA to implement a preliminary investigation into the soil and groundwater conditions in the vicinity of the former USTs A Work Plan for the investigation was submitted and, in November 1992, it was approved by the San Joaquin County Public Health Services, Environmental Health Division (EHD) On November 5, 1992, five borings (B-1 through B-5) were drilled by West Hazmat Inc and continuously logged by MARK at the locations indicated in Drawing 1-2 The borings ranged in depths from 25 to 45 feet bgs Soil and groundwater samples were collected from the borings Tine analytical results for the samples indicated that the soil and groundwater had been unpacted by petroleum hydrocarbons The preliminary investigation •� is documented in the MARK Sampling and Analysis Report (December 1992). On January 19, 1993, MARK submitted a Work Plan for a Supplemental Soil and Groundwater Investigation and Soil Remediation to the EHD The Work Plan was approved by the EHD on January 23, 1993 and was implemented by MARK in January 1993 The primary tasks conducted during this work were as follows ■ Investigation of soil and groundwater conditions in the vicinity of former USTs, ■ Excavation and segregation of hydrocarbon-impacted soil from the vicinity of the former USTs, ■ Installation and operation of a vapor extraction/injection system for removal of trace residual concentrations of hydrocarbons in areas where excavation could not be effectively achieved, ■ Treatment pile construction, installation and operation of a Heat Enhanced Vapor ExtractionMermal Oxidation (HEVE/TO) remediation system to i° treat impacted excavated soil for disposal, FASCLOSE 1 1-2 92-1177102.36