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Quarterly Report - Second Quarter 2004 <br /> City of Stockton - FIRE STATION #2 <br />' 110 West Sonora Street, Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of the City of Stockton,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> report for corrective action activities conducted at 110 West Sonora Street,Stockton,California(the <br /> site) The location of the site and its surroundings are illustrated on Figure I Structures and well <br /> locations associated with the site are depicted on Figure 2 <br />' m was installed 01 Jul 2003 on-site utilizing the existing in-situ air <br /> An ozone air sparging syste a y , g g <br />' sparging (IAS) system wells IAS-1 through IAS-3 The system has operated continuously since <br /> installation <br />' This report also documents ground water monitoring and sampling of monitoring well VW-2d on <br /> the 10 May, 10 June and 12 July 2004 in order to determine concentration trends for the <br /> contaminants of concern(COCs) Ozone-sparging as a remediation alternative was predicated upon <br />' a 50-percent reduction in COCl over six months of operation <br /> In addition,depth to ground water was measured in monitoring wells MW-1,MW-3,MW-4,MW-5 <br />' and VW-5d on 10 May and 10 June 2004, but these wells were not purged or sampled <br /> I <br />' 1 1 SITE BACKGROUND <br /> The site is bounded on the north by Sonora Street, on the west and south by Madison Street and on <br />' the east by Commerce Street Presently a single building is located at the northern portion of the site, <br /> occupied by the City of Stockton-Fire Prevention Department The properties surrounding the site <br /> are mostly industrial, with a few residences east of the site <br />' A diesel/gasoline fueling system previously occupied the northwestern portion of the site, a <br /> petroleum hydrocarbons release from the associated underground storage tanks(USTs) is presently <br /> being remediated by procedures outlined in Design Plans and Specifications For Sod and <br /> Groundwater Remediation, prepared by ATC Associates Inc (ATC) and approved by the San <br />' Joaquin County Environmental Health Department (EHD) by letter dated 03 January 2001 <br />' 12 SITE REMEDIATION PROGRESS <br /> A soil vapor extraction/in-situ air sparging system was installed during August and September 2001 <br />' Soil vapor monitoring and sampling events, ground water sampling events and the results of <br /> . laboratory analysis of the samples collected have been documented in subsequent quarterly <br /> monitoring reports The operation of the IAS system has produced only minor volatilization of the <br /> Advanced Geo Environmental,Inc <br />