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Ozone Sparging and Additional Monitoring Well Installation Work Plan FIRE STATION #2 - 110 West Sonora Street, Stockton, California 10 INTRODUCTION At the request of the City of Stockton, Advanced GeoEnvri onmental, Inc (AGE) has prepared the enclosed Ozone Sparging and Additional Monitoring Well Installation Work Plan for the unauthorized release of hydrocarbons fi om the common undel ground storage tank(UST) area at the north end of the property located at 110 West Sonora Street, Stockton, California (the site) The location of the site is illusti ated on Figure 1 and a plan of the site is illustrated on Figure 2 This work plan was prepared in response to the San Joaquin County Environmental Health Department (EHD) letter, dated 01 May 2002 requesting additional vertical assessment of groundwater contamination AGE proposes to install one depth-discrete ground water monitoring well at the former UST location, screened from 65 to 70 feet below sur face grade(bsg),the pi oposed well location is illustrated in Figuics 2 In addition, the operation of the in-situ air sparing (IAS) system has pi oduced only nunoi volatilization of the dissolved hydrocarbons to the ground water at the site,concentrations ofhydi ocarbons in the soil vapor extraction(SVE)influent hay c been i educed to levels below detection limits Therefore, AGE proposes to augment the in-situ IAS system V, lj a, low-flow, ozone generator Procedures outlined within this 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 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 industi ial, with a few residences east of the site A diesel/gasoline fueling system previously occupied the northwestern portion of the site,a petroleum hydrocarbons i Blease from the associated underground stoi age tanks (USTs) is presently beuig remediated by procedures outlined in Design Plans and Specifications For Soil and Groundwater Remediation, pr epared by ATC Associates Inc (.ATC) and approved by the EHD by letter dated 03 January 2001 A soil vapor exti action/in-situ au spar ging 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 Adv&necd GeoEnvtro=entnI Inc