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i IQuarterly Report - Third Quarter 2004 City of Stockton - 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 this report for corrective action activities conducted at 110 West Sonora Street,Stockton,California(the site) The location of the site and its surroundings are illustrated on Figure 1 Structures and well locations associated with the site are depicted on Figure 2 I An ozone air sparging system was installed 01 July 2003 on-site utilizing the existing in-situ air sparging (IAS) system wells IAS-1 through IAS-3 The system has operated continuously since installation This report documents ground water monitoring and sampling of monitoring wells on 10 August 2004 in order to determine concentration trends for the petroleum hydrocarbons i 1 1 SITE BACKGROUND IThe 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 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 San Joaquin County Environmental Health Department (EHD) by letter dated 03 January 2001 ' 12 SITE REMEDIATION PROGRESS ' A soil vapor extraction/in-situ air sparging (SVE/IAS) system was installed during August and September 2001 Soil vapor monitoring and sampling events,groundwater sampling events and the ' results of laboratory analysis of the samples collected have been documented in subsequent quarterly monitoring reports The operation of the lAS 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 Subsequently, AGE had proposed to augment the IAS system with a low-flow ozone generator in the work plan dated 28 January 2003 Operation of the ozone injection system has been • ongoing since July 2003, resulting in a general downward concentration trend ' Advanced GcoEnvironmental,Inc