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r r QUARTERLY REPORT r Genova Bakery 749 Sierra Nevada Street ' Stockton, California July 1994 ' 1.0 INTRODUCTION M accordance with a request from Mrs Donna Bruno, co-executor of the Rollen estate, Geological Audit Services, Inc (GeoAudit) has prepared this quarterly report for property located at 749 North Sierra Nevada Street in Stockton, California The project is being conducted for the estate of Angelo Rollen under the supervision of the San Joaquin County Public Health Services-Environmental Health Division (PHS/EHD) This report documents the installation and sampling of two additional monitoring wells and two investigative borings The location of the site is illustrated in Figure 1 A plan of the site is illustrated in Figure 2 2.0 BACKGROUND 2.1 Site Location ' The site is located at the corner of North Sierra Nevada Street and Flora Street in Stockton, California The site currently operates as Genova Bakery The property is occupied by a single building One 350 gallon gasoline underground storage tank (UST)was removed from beneath the sidewalk, on the west side of North Sierra Nevada Street, in September 1989 Samples collected from beneath the UST indicated that an unauthonzed release of hydrocarbons had occurred The PHS/EHD required investigation of the lateral and vertical extent of petroleum hydrocarbons t2.2 Hydrocarbon Impacted Soil and Groundwater Assessment Assessment of hydrocarbon impacted soil and groundwater at this site was completed by Groundwater Technology, Inc and reported in November 1987 and October 1988 Seven groundwater monitonng wells were installed on or near the site Free product was observed ' in MW-1 and MW-2 and was removed by representatives of Genova Bakery No contamination was detected in the other five wells The assessment of hydrocarbon impacted soil indicated that vadose zone contamination was restricted to the area immediately below the former UST location. GeoAudit installed a caw.s.ky Qwr v+n i 1