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Monitoring Well Installation Work Plan CHARLIE'S DAY & NITE 706 North El Dorado Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Charles Skobrak of Charlie's Day&Nite,and in accordance with requirements of the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD), Advanced GeoEnvironmental, Inc. (AGE) has prepared this work plan for the installation and sampling of ground water monitoring wells at 706 North El Dorado Street, Stockton, California. The site setting is illustrated in Figure 1. A plan of the site is illustrated on Figure 2. This work plan is prepared in accordance with PHS-EHD and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. The purpose of this assessment is to define the extent of petroleum hydrocarbon impact to ground water at the site and provide repeatable sampling points for ground water monitoring. This work plan provides a description of the scope of work and field procedures for the assessment activities. 2.0. BACKGROUND Two 4,000-gallon USTs were removed from the southeastern portion of the site in June 1997. Reportedly, the USTs had not been in operation since at least 1978. Petroleum hydrocarbons were detected in the sample collected beneath the western end of the southern UST at a concentration of 11,000 parts per million (ppm). Hydrocarbons were not detected in the three remaining samples collected beneath the USTs or one sample collected beneath"dispenser 41". Product piping between the former USTs and the dispenser islands was removed in August 1998. In October and November 1998, six soil probe borings (probings)were advanced at the site to depths between 30 and 64 feet below surface grade (bsg). Petroleum hydrocarbons were detected in soil samples collected from probing B3, advanced near the western dispenser island location at concentrations as high as 3,700 ppm. Petroleum hydrocarbons were not detected in soil samples collected at depths greater than 30 feet bsg or in samples collected from probings B 1, B2, B4, B5 or B6, defining the vertical and lateral extent of impacted soil at the site. Ground water was measured at a depth of 23 feet bsg during advancement of soil probe borings at the site. TPH-g was detected at concentrations of 12,000 parts per billion(ppb), 250 ppb and 220 ppb in grab water samples collected from probings B3, B 1 and B5, respectively. Hydrocarbons were not detected in water samples collected from probings 132, B4 and B6. Impacted soil and ground water appears to be centered near the western dispenser island. Fuel oxygenates were not detected in soil or ground water samples collected from the site. Advanced Geo En'ironmental,Inc.