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24323 Hwy 99,Acampo,CA 6353233ES411 -4- 2.0 INTRODUCTION 2.1 PROJECT INFORMATION Project Information ITEM Odic Environmental 6353233ESAII Project Number Subject Property Address 24323 Hwy 99,Acam o,San Joaquin C unty,California Drilling&Sampling Date December 13 and 14,2012 ODIC's Field Technician Marc Hache QA/QC Reviewer John Winkler,California Professional Geologist The subject property is located west of Highway 99, approximately 1,000 Property Location feet north of E. Jahant Road/E. Woodson Road, in the City of Acampo, California.Figure 1 illustrates the Site Location Map. 2.2 OBJECTIVE The subject property is comprised of an approximately 2.39-acre parcel of land and is improved with a gasoline station,a convenient store,and a restaurant. Asphalt-paved parking areas are present on the southern portion of the property. The northern portion of the property is predominantly gravel surfaces. Four USTs, including one 20,000-gallon double-walled diesel UST,two 5,000-gallon double-walled gasoline USTs and one 10,000-gallon gasoline UST, are located on the subject property. Although installation dates were not provided, the USTs were likely installed in 1998 after removal of the previous USTs. Based on information contained in the Phase I report,soil and/or groundwater sampling last occurred on the subject property in September 2003.The gasoline station has operated onsite since 1974 and no information related to the installation dates of the USTs removed in 1998 was provided. A subsurface investigation was conducted based on the risk of a release of hazardous materials from past site use and to assess the potential for past underground storage tanks. 2.3 SCOPE OF WORK To accomplish this objective,ODIC performed the following tasks: Pre-Field Activities: Performed Site Visit to verify existing conditions and pre-mark boring locations and notified Underground Service Alert (USA) of the intent to excavate or drill, and used standard care to avoid potential damage to subsurface utilities. A Site-specific Health and Safety Plan (Level D Health & Safety according to OSHA CFR 1910.120, Boring Plan and Work-Schedule were prepared. Notified the owner and tenants of the proposed work schedule; Field Investigation: • Performed a geophysical survey using Ground Penetrating Radar (GPR) and electroconductivity instrumentation to screen the site for any potential USTs and subsurface utilities. • Advanced seventeen soil borings to a depth of 10-20 feet in the areas of underground storage tanks, fuel dispenser locations,and areas of possible former USTs and dispensers. • Collected soil samples for soil description and submitted selected samples for laboratory analysis of contaminants of concern. ODIC En v i r o n mental.