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' Quarterly Monitoring Report - Fourth Quarter 2003 • 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 in Figure 1 Structures and well ' locations associated with the site are depicted in Figure 2 An ozone air spargmg system was installed on the site 01 July 2003 and is utilizing the existing in- situ air spargmg (IAS) system wells IAS-1 through IAS-3 The system has operated continuously since installation This report documents quarterly ground water monitoring sampling of vapor well VW-2d on the 17 December 2003, quarterly ground water monitoring and sampling on 09 January ' 2004, and monitoring the results of the ozone system on 14 January 2004, and further presents the results of laboratory analysis of ground water samples ' SITE 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 properties surrounding the site iare 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 EHD by letter dated 03 January 2001 ' A soil vapor extraction/in-situ air spargmg 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 ground water at the site, concentrations of hydrocarbons in the soil vapor extraction(SVE)influent have been reduced to levels below detection limits Therefore,AGE ' augmented the in-situ 1AS system with a, low-flow, ozone generator 1 1