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Monitoring Well Installation Report 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 the enclosed Monitoring.Well Installation Report for 1617 North California Street, Stockton, California(site). The scope of work included the installation and development of one.monitoring well, performance of.a sampling event and preparation of this report. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on.Figure 2. 2.0. BACKGROUND The site, located at 1617 North California Street in the City of Stockton, San Joaquin County, is situated in an area of mixed residential and commercial use. The property is presently occupied by a medical arts building, located on the western portion of the property, and a large parking area, comprising the eastern portion of the site. The property is located immediately west of St. Joseph's Hospital. 2.1. BACKGROUND/SITE HISTORY f Research of historical fire insurance maps(Sanborn)of the site and surrounding area,indicates that v the southern portion of the site was occupied by a gasoline service station from approximately the 1950s until the early 1970s. AGE has no information regarding the removal of the underground storage tanks (USTs)nor associated sampling. Los 2.2. 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 of 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. On 01 June 2004,two soil borings were advanced at the site to collect soil and ground water samples ,y as part of the assessment activities.,-Each boring was advanced to 50 feet below surface grade(bsg); see Figure 2. Total petroleum hydrocarbons quantified as gasoline were detected in the groundwater sample from boring P 1 at a concentration of 140 micrograms per liter(µg/1).NOL other target analytes were detected in the analyzed soil or groundwater samples. �+ Advanced GeoEnvironmental,Inc.