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r y <br /> w <br /> PRELIMINARY SITE ASSESSMENT REPORT <br /> January .I997 ' <br />' Joe's Truck Stop <br /> 15600 Harlan Road, Lathrop, California <br /> 10. INTRODUCTION <br />' In accordance with the request of Mr Raymond Melendez of Melendez Design Corporation <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this report regarding field work performed <br /> at 15600 Harlan Road, Lathrop, California The scope of work included the advancement of seven <br /> soil probe borings near the underground storage tank (UST) and septic system areas and collection <br /> of soil and "grab ' ground water samples The location of the site is illustrated in Figure 1 -Location <br /> IMap Site structures and probing locations are illustrated on Figure 2 - Site Plan <br /> Field work was performed in-accordance,with San Joaquin County Public Health Services - <br /> Environimental Health Division (PHS-EHD) and Cential Valley Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> 20 BACKGROUND <br />�! The site is located in a commercial area of low topographic relief west of Lathrop, California, <br /> adjacent to Interstate 5 (Figure 1) The property is utilized as a gasoline and diesel service station <br /> It is our understanding that four (4) underground storage tanks (USTs) are presently located on the <br /> property in two separate areas The tanks are one 10 000-gallon unleaded gasoline UST, one 8,000- <br /> gallon diesel UST, one 6,000-gallon dieuel UST, and one 12,000-gallon diesel UST According; to <br /> Mr Ron Rowe of the San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD), three "unauthorized release' reports have been filed for the site <br /> Plans have been submitted to the City of Lathrop for expansion of the facility into a large truck <br /> fueling station Prior to the removal and replacement of the USTs, a preliminary site assessment was <br /> performed <br /> Ground water occurs at a depth of appioaimately 6 to 12 feet below surface (bs rade Ground <br /> g g) <br /> water flow is assumed to be southeasterly based on information supplied by Mr Ron Rowe of the <br /> PHS-131-11) <br /> 3.0 PROCEDURES <br /> 3 1 PROBING AND SAMPLING <br /> \ r <br /> J Seven soil probe borings (probings) were advanced at the site on 14 and 15 January 1997, using <br />