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. Work Plan Addendum - January 1998 <br /> Arco Mini Mart <br /> 4511 Pacific Avenue <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr Art Wyatt, Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared the enclosed Work Plan Addendum for 4511 Pacific Avenue in Stockton, California (the <br /> site) <br /> The scope of the work includes the advancement of eight to ten soil borings for the collection of soil <br /> and grab water samples Additionally four ground water monitoring wells will be installed following <br /> review of the analytical data collected from the grab water samples and approval of well locations <br /> by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) <br /> A plan of the site is illustrated on Figure 1 <br /> This work plan was prepared in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank (UST) sites <br /> 20. BACKGROUND <br /> 2 1 SITE DESCRIPTION <br /> The site is located at the northwest corner of Pacific Avenue and Rose Marie Lane in Stockton, <br /> California and is currently operated as a gasoline dispensing station and mini-mart The facility <br /> consists of a building and three dispenser pump islands covered with a canopy <br /> 22 SITE ASSESSMENT <br /> In February 1991, a broken coupling in a product line was discovered and repaired During repair <br /> procedures, hydrocarbon-impacted soil was discovered beneath the product line Subsequently, the <br /> PHS-EHD required an assessment of the vertical and lateral extent of the hydrocarbon impact <br /> Six USTs were removed from the site on S April 1994 In May 1994, two 12,000-gallon USTs and <br /> associated piping were installed at the site to replace the removed tanks Details of the UST removals <br /> and soil sampling were presented in reports to the PHS-EHD Hydrocarbons in soil were detected <br /> in the area of the former USTs The hydrocarbon-impacted soil was limited to the eastern portion <br /> of the UST-removal area and the dispenser islands Three cross section of the soil stratigraphy are <br /> included in the addendum (See Figures 2 through 4) Figure 1 depicts the lines of the cross sections <br /> • Maps depicting discrete depth lithologies, referred to as sub-crop maps are also included in this <br /> Adhanced GeoEmironmenla[,Inc <br />