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Limited.Subsurface Investigation CALIFORNIA STREET MEDICAL BUIL.DING 1617 North California Street, Stockton, California 1.0. INTRODUCTION At the request ofMr.Charles Green of Walnut Street Medical Center,Advanced GeoEnvironmental, Inc. (AGE)has prepared this Limited Subsurface Investigation Work Plan for the property at 1617 .North California Street,Stockton,California(the site).The work is being performed as part of a due diligence_for a property transfer. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan. was prepared as required by the San Joaquin County Environmental Health Department(EHD)for the procurement of a soil boring permit, and is in accordance with Appendix A to Tri-Regional Recommendations -Reporting, dated 30 August 1991,prepared.by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The subject property,located at 1617 North California Street in the city of Stockton, California, is situated in an area of mixed commercial and light industrial use. Historical site usage research performed by AGE has indicated that the southeast portion of the site was-occupied by a gasoline service station from approximately the 1950s until the early 1970s. 2.1. PREVIOUS INVESTIGATIONS In 1994,a limited investigation was performed at the site by Northwest Envirocon,Inca(NWEI).The limited investigation consisted of a geophysical survey and shallow hand auger borings with field screening of soil samples for organic vapors, in the area of.the former gasoline station. Field observations of soil samples indicated that petroleum hydrocarbons maybe present in the subsurface at the site;however, no soil or ground water samples were submitted to a laboratory for analysis. The prominent features on the subject property are depicted in Figure 2. 2.2. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of-the'Great Val ` California, a large, elongate, northwest trending, asymmetric struct southern portions of the Province have been designated the Sacrame .respectively.The Province is bordered by the Coast Ranges to the wes Cascade Range to the north, and the Sierra Nevada to the'east. Advanced GeoEnviron mental,Inc.