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Additional Site Assessment Work Plan FIRE STATION#2 110 West Sonora Street,Stockton,California 1.0. INTRODUCTION At the request of the City of Stockton,Advanced GeoEnvironmental, Inc. (AGE)has prepared the enclosed Additional Site Assessment Work Plan for the property located at 110 West Sonora Street, Stockton,California(the site.The location of the site is illustrated on Figure I and 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 21 April 2005. Procedures outlined within the work plan are described in accordance with the California Regional Water Quality Control Board - Central Valley Region (CRWQCB-CR) guidelines for the investigation of UST sites. 2.0. BACKGROUND The site is bounded on the north by Sonora Street,on the west and south by Madison Street and on the cast by Commerce Street.Presently a single building is located at the northern portion ofthe site, occupied by the City of Stockton - Fire Prevention Department. A diesel/gasoline fueling system previously occupied the northwestern portion ofthe site;a petroleum hydrocarbons release from the associated underground storage tanks(USTs)is presently being remediated. The properties 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 hydrocarbons release from the associated underground storage tanks(USTs)is presently being remediated by procedures outlined in Design Plans and Specifications For Soil and Groundwater Remediation, prepared by ATC Associates Inc. (ATC)and approved by the EI-ID by letter dated 03 January 2001. A soil vapor extraction/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 monitoring reports. The operation of the IAS system has produced only minor volatilization of the dissolved hydrocarbons in the deep ground water well samples at the site(VW-2D),but has reduced the dissolved hydrocarbon concentration:in the shallow well samples(MW-1 and VW-1)as well as the concentrations of hydrocarbons in the soil vapor extraction(SVE) influent to below detection levels. AdvancedGcoEnvirontnental,Inc.