WORK PLANS - Laserfiche WebLink

Home Browse Search

1.0 INTRODUCTION This work plan presents the scope of work and methodology that Tetra Tech EM Inc. (Tetra Tech)will use to conduct a subsurface underground storage tank(UST) site evaluation at 4950 Bonham Street, Linden California(Figure 1). The subsurface UST evaluation will;assess�the nature and extent of I ` petroleum hydrocarbon impacts to the soil associated with a forme 3,500-gallon underground storage 1 It A1 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,action status. 1.1 SITE LOCATION AND DESCRIPTION d4 An unauthorized release of petroleum hydrocarbons was discovered during the removal of one 3,500 - 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 milligra ns perl'kilogram (mg/kg)to 1,500 mg/kg. The soil sample analysis indicated that the hydrocarbon coIx ntamination was weathered diesel fuel. No gasoline or gasoline constituents were detected. 1.2 PURPOSE E ;F P The purpose of the proposed work described in this work plan is to,determine the vertical and horizontal extent of petroleum hydrocarbons in the soil in the vicinity of the two former USTs. Information I obtained during the limited subsurface investigation will be used to,move ahe tank site towards no further action status. 1.3 PROJECT SCOPE OF WORK I The proposed scope of work includes the following tasks: Il � • Task I-Work Plan Development: Prepare and submit a work plan for review and comment by the San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)to obtain jI 'j regulatory concurrence before initiation of the proposed field activities. I� =r