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Monitoring Well Installation Work Plan CALIFORNIA STREET MEDICAL BUILDING 1617 North California Street, Stockton, California 1.0. INTRODUCTION ' At the request of Mr.Charles Green of Walnut Street Medical Center,Advanced GeoEnvironmental, Inc.(AGE)has prepared this Monitoring Well Installation 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/monitoring well installation 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,and is situated in an area of mixed commercial and light industrial use. Historical site usage research I erformed 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,Inc.(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 or the former gasoline station. Field observations of soil samples indicated that petroleum hydrocarbons may be 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. On 01 June 2004, two soil probe borings (P 1 and P2) were advanced at the site by AGE to collect soil and ground water samples.Three soil samples and two groundwater samples were submitted for analysis. Total petroleum hydrocarbons,quantified as gasoline were detected in the groundwater sample from boring PI ("PI-W") at a concentration of 140 micrograms per liter:µg/1 (parts per billion). No other target analytes were detected in the analyzed soil or groundwater samples. A Limited Subsurface Investigation Report, dated 14 June 2004, was submitted to the EHD upon completion of the June 2004 investigation. According to conversations with EHD personnel, Advanced GeoEnvironmental,Inc.