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Monitoring Well Installation Work Plan YAMADA BROTHERS 15406 South Tracy Boulevard, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bob Yamada, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Work Plan for investigation of the Yamada Brothers property located at 15406 South Tracy Boulevard, Stockton, California (Figure 1).The purpose of the monitoring well installation is to evaluate the vertical and lateral extent of petroleum hydrocarbon impact to soil and ground water encountered during the removal of underground storage tanks (USTs) and during the Preliminary Site Assessment. This Work Plan provides the scope of work and procedures to be implemented to advance soil borings, soil and groundwater sample collection and analysis, and monitoring well installation and soil boring abandonment. _ This Work Plan has been prepared as required by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and was prepared in accordance with the Regional Water Quality Control Board's Tri-Regional Board Staff Recommendations for Preliminary &aluation and Investigation of Underground Tank Sites guidelines for the investigation of UST sites. 2.0. BACKGROUND The site is located on Union Island on the east side of South Tracy Boulevard, south of Clifton Court Road and north of the Grant Line Canal, north of the City of Tracy, San Joaquin County, California. The site is located in the northern half of Section 29, Township 1 South, Range 5 East, Mount Diablo Base and Meridian in an area of low topographic relief, at an elevation of approximately 3 feet above mean sea level (Union Island Quadrangle, 7.5-Minute USGS Topographic Series, 1978). The site and surrounding area utilized for agricultural purposes. 2.1. UST REMOVAL AGE has been informed that two USTs were removed fro3n the site in July 1991. Ground water was encountered at a depth of approximately 7 feet below surface grade (bsg) during the UST removal. Total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in a grab water sample _ collected fro3n the excavation at a concentration of 210 parts per billion (ppb) following removal of the UST. Analytical results of soil samples collected were not available. The PHS-EHD subsequently required investigation to determine the extent of impacted soil and ground water. Advanced GeAn%ironnlcnial,Inc.