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I Quarterly Report - Fourth Quarter 1999 • YAMADA BROTHERS I15406 South Tracy Boulevard, Stockton, California ' 1.0. INTRODUCTION I In accordance with the request of Mr Bob Yamada of Yamada Brothers, Inc , Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for the property located at 15406 South Tracy Boulevard, Stockton, California The scope of work included installation of three ' ground water monitoring wells, quarterly ground water monitonng and preparation of this report The location of the site and the immediately surrounding area are illustrated on Figure 1, structures and monitoring well locations on the site are illustrated on Figure 2 Background information is Isummarized in the Preliminary Site Assessment Report-February 1999, prepared by AGE I2.0. 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 in 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 are operated as farms IAGE has been informed that two USTs were removed from the site in July 1991 Ground water was encountered at a depth of approximately 7 feet below surface grade (bsg) during the UST removal I Total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in a grab water sample collected from 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 Three domestic wells are located approximately 150 feet southwest of the former USTs location According to Mr Bob Yamada, bottled water is used for all drinking water and cooking at the site 3.0. PROCEDURES Three ground water monitoring wells were installed in November 1999 Quarterly ground water monitoring was performed on 29 November 1999 Field work was performed in accordance with the San Joaquin County Public Health Services - Environmental Health Division and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of Iunderground storage tank (UST) sites Advanced GeoEnvironmental,inc s