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• ''� CONDOR EARTH TECHNOLOGIES INC <br /> 5 188 Frank West Circle, Suite I <br /> Stockton, CA 95206 <br /> Phone 209.234.0518 <br /> R FAX 209.234.0538 <br /> CONDOR www.condorearth.com <br /> — March 24, 2008 10� <br /> � <br /> LVED <br /> Ms. Ava Langston-Kenney MAR 7 2008 <br /> Program Manager <br /> ENVIRONMENT HEALTH <br /> City of Stockton Redevelopment Department <br /> 425 N. El Dorado Street, Room 317 PERMIT/SERVICES <br /> Stockton, CA 95202-1997 <br /> Re: Subsurface Investigation,216 N. California St., Stockton, San Joaquin County, California <br /> Condor Project No. 5401 <br /> Dear Ms. Langston-Kenney: <br /> This is a report of findings for the fieldwork conducted at 216 N. California Street, Stockton, California <br /> _ on February 19, 2008. The property is referred to as Parking Lot B and is designated by Assessor Parcel <br /> Number(APN) 139-250-26 (Site) (Figures 1 and 2, Attachment A). This report includes Site background <br /> information, a description of field activities, laboratory analyses, and conclusions. This report presents <br /> results of subsurface soil and groundwater sampling adjacent to the northwestern corner of the Site,where <br /> a former underground storage tank (UST) was located. The Site is owned by the City of Stockton, and <br /> managed by the Redevelopment Department (Client). Due to unexpected subsurface conditions, only one <br /> boring was completed to 50 feet below ground surface(bgs) in the central former tank pit area. <br /> SITE BACKGROUND INFORMATION <br /> On December 3, 2004, Thorpe Oil removed one UST at the Site. Soil staining and petroleum odors were <br /> noted in the excavation and excavated soil. Soil samples were collected from locations directed by the <br /> SJCEHD, following removal of the UST. Based on our review of the project's background information, <br /> and the correspondence provided to us by the Client, Condor understands that a UST was located and <br /> removed from the western portion of the Site. The UST had the following characteristics: 1,500 gallon <br /> capacity; single-wall steel construction; formerly contained heating oil; and was located beneath the <br /> sidewalk on California Street. Upon removal, the UST was noted to have corrosion and adjacent dark, <br /> stained soil, with indications of long-term leakage. The laboratory analytical results provided to Condor <br /> along with the correspondence indicated that diesel-range hydrocarbons were detected in soil samples <br /> collected from the excavation during the UST removal activities. <br /> Samples were collected from the north and south ends of the UST excavation near the bottom of the <br /> excavation. The laboratory analytical results indicated that the total petroleum hydrocarbons quantified as <br /> _ diesel (TEPH-D) were detected at a concentration of 3,300 milligrams per kilogram(mg/kg) on the north <br /> end, and 6,300 mg/kg on the south end of the UST excavation. The UST removal activities were <br /> described by the San Joaquin County Environmental Health Department (SJCEHD) and Thorpe Oil in the <br /> notes made during the UST removal. <br /> — <br />