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IPreliminary Investigation and Evaluation Report MBP MOSSDALE I444 Mossdale Road, Lathrop, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr Nick Bokides,Advanced GeoEnvironmental, Inc (AGE) has.prepared this preliminary investigation and evaluation report (PIER) for Mel Bokides Petroleum located at 444 Mossdale Road, Lathrop, California (site) The location of the site is illustrated in Figure 1, a site Iplan is shown in Figure 2 The scope of work included the advancement of eight soil probe borings to evaluate the lateral and I vertical extent of petroleum hydrocarbons in soil and ground water This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board for investigation of underground storage tank (UST) sites ' 2.0. BACKGROUND . The site is located in an incorporated, commercial/agricultural area of Lathrop, California, on Mossdale Road (Figure 1) The site is presently under construction to install a new fuel station 21 SITE DESCRIPTION The major portion of site consists of asphalt or concrete paved area One building containing an office and store is located on the property (Figure 2) One domestic ground water well is located on the property and an additional domestic well is located on the property east of the site The surrounding sites are used for boat storage/sales and for agricultural purposes, a California Department of Transportation road right-of-way is located west and north of the site Three USTs, dispensers and piping were active on the site for approximately 15 years, from the mid 1980s to the late 1990s The UST removals were witnessed by a representative of the PHS-EHD The history of the USTs use, tank tests, product inventory and repairs are not known to AGE 2 2 UNDERGROUND STORAGE TANK REMOVAL On 05 February 1998, one 10,000-gallon gasoline UST,one 8,000-gallon diesel UST and one 8,000- gallon gasoline UST were removed from the site by Dan Samuels Construction The approximate locations of the former USTs, product piping and dispenser samples are shown on Figure 2 The three USTs were removed from a common excavation near the northwest corner of the site The • former fuel dispensers were located east of the USTs Following removal of the USTs, an AGE representative collected 20 soil samples from the former UST, dispenser, and product line locations Advanced GeoEnvironmental,Inc I