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Confirmation Soil Sampling Work Plan FIRE STATION#2 110 West Sonora Street, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of the City of Stockton,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Confirmation Soil Sampling Work Plan for the property located at 110 West Sonora Street, Stockton,California(the site). The scope of work includes collection and analysis of additional soil samples for confirmation soil sampling in conjunction with soil vapor extraction remediation of hydrocarbon-impact soil and ground water at the site. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan is prepared at the verbal request of the San Joaquin County Environmental Health Department(EHD)received during the quarterly meeting held at the EHD on 04 August 2006, and in the EHD directive letter dated 07 August 2006. The purpose of the work is to collect soil samples from the"core"petroleum hydrocarbon-impacted area at the site,to evaluate the remaining mass of hydrocarbons impacting the soil at the site, and to determine the potential impact on human health (indoor air intrusion) of the site's residual hydrocarbons. This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for investigation of underground storage tank (UST) sites and in accordance with Guidance For The Evaluation And Mitigation Of Subsurface Vapor Intrusion To Indoor Air (15 December 2004, revised 07 February 2005), established by the California Environmental Protection Agency(Cal EPA)-Department of Toxic Substances Control(DTSC)for the intrusion of subsurface vapors into buildings. 2.0. BACKGROUND The site is bounded on the north by Sonora Street,on the west and south by Madison Street,and on the east by Commerce Street.Presently,a single building is located at the northern portion of the site, occupied by the City of Stockton-Fire Prevention Department.The businesses surrounding the site are mostly industrial, with a few residences east of the site. A diesel/gasoline fueling system previously occupied the northwestern portion of the site; a petroleum hydrocarbon release from the associated USTs is presently being remediated by procedures outlined in Design Plans and Specifications For Soil and Groundwater Remediation, prepared by ATC Associates Inc. (ATC) as approved by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD), by letter dated 03 January 2001. A soil vapor extraction (SVE)/in-situ air sparging (IAS) system was installed during August and September 2001.Soil vapor monitoring and sampling events,ground water sampling events,and the results of laboratory analysis of the samples collected have been documented in subsequent quarterly Advanced GeoEnvironmentai,Inc.