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1.0 INTRODUCTION +'r This work plan presents the scope of work and methodology that Tetra Tech EM Inc. (Tetra Tech)will Esubsurface underground storage tank ST site evaluation at 4950 Bonham Street, 4 use to conduct a su g g (UST) � Linden California(Figure 1). The subsurface UST evaluation will•a;ssess the nature and extent of I petroleum hydrocarbon impacts to the soil associated with a former' 3,50 ftallon underground storage . i !I tank(UST)and a former 4,000-gallon UST at the site. The work described in this work plan is intended to expedite the tank sites towards regulatory closure and no further�actionstatus. 1.1 SITE LOCATION AND DESCRIPTION � I An unauthorized release of petroleum hydrocarbons was discovered during the removal of one 3,500 - 4 gallon UST,tank identification number 39-2528-02; and a 4000-gallon UST,tank identification number 39-2528-01,at the referenced site(Figure 2). Soil samples obtained from the tank pit indicated total petroleum hydrocarbon contamination ranging from 1,000 milligrams per kilogram(mg/kg)to 1,500 � e h drocarbon c�tamitiation was weathered diesel mg/kg. The soil sample analysis indicated that the y r fuel. No gasoline or gasoline constituents were detected. 1.2 PURPOSE ilk E The purpose of the proposed work described in this work plan is to deterinine the vertical and horizontal l' extent of petroleum hydrocarbons in the soil in the vicinity of the two former USTs. Information obtained during the limited subsurface investigation will be used to move the tank site towards no further f action status. 1.3 PROJECT SCOPE OF WORK 3 The proposed scope of work includes the following tasks: • Task I-Work Plan Development: Prepare and submit a work plan for review and comment by the jSan Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)to obtain I , regulatory concurrence before initiation of the proposed field activities. !k 4 i I� ' a �I i!