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OZONE MICROSPARGE WELL AND SYSTEM INSTALLATION REPORT i >f at Former Tosco (Unocal) Service Station,N_o,6981 4707 Pacific Avenue Stockton, California _ Report No 140124 12 s INTRODUCTION 1 This report summarizes field activities performed by Gettler-Ryan Inc (GR) in November 2001, at the above referenced location The purpose of these activities was to install ozone mrcrosparge wells at the site as part of the proposed vapor extraction/ozone microsparge'remediation system installation - and operation The work performed included drilling and constructing thirteen ozone microsparge wells in the bonngs, collecting one soil stockpile sample for soil disposal at an appropriate facility, installing and startup of an ozone mrcrosparge remediation system, and preparing this report This work was performed at the request of Tosco Corporation (Tosco) This work was originally proposed in the GR Report No 140124 09,Remedial System Enhancement Plan, dated August 8, 2001 The • work plan was approved by the San Joaquin County Public Health Services-Environmental Health Division (SJCPHS-EHD)in a letter stamp dated September 14, 2001 SITE DESCRIPTION The subject site (parcel APN 108-160-04), is a paved lot located within a Target Department Store parking lot at the northwest corner of the intersection of Pacific Avenue and March Lane in Stockton, California The site was formerly a Gemco Department Store and Service Station dispensing petroleum fuel prior to purchase by Target Operation of a facility dispensing 76 branded products was initiated in 1982 The subject site was most recently a 76 Service Station with two gasoline underground storage tanks (USTs), three fuel dispenser islands, and a station kiosk All aboveground and subsurface facilities related to the service station were removed in April 2000 A total of twelve groundwater monitoring wells,one groundwater recovery well, eight , vapor extraction wells, a VES remediation system, and a compound exist at the site The nearest surface water is the Calaveras River, located approximately 2,000 feet southeast of the subject site Topography in the site vicinity is flat-lying, at an elevation of approximately 13 feet above mean sea level (MSL) Former locations of pertinent site features are shown on Figure 2 SITE GEOLOGY The subject site is located in the Central Valley geomorphic province of California, which is a northwestward-trending asymmetrical structural trough that has been filled with 6 to 10 miles of sediment ranging in age,from Juiassrc to Holocene The topographic surface is nearly flat with a slightwestward slope Based on a geologic map,prepared by March and Atwater (1975), i F s