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PRE-TANK REPLACEMENT SITE ASSESSMENT WORK PLAN 1071 North Main Street,Manteca,California 1.0 INTRODUCTION This work plan describes the planned.pre-tanke _replacment•site assessment at the Shell Oil Company (Shell) retail gasoline station located-at--1071 North Main i Street, Manteca, San Joaquin County, California (Figure 1). This work plan was requested by Shell in preparation for the replacement of the underground fuel storage tanks located at the site. 1.1 Purpose The purpose of this investigation is to:. o Characterize the site geologic and hydrogeologic conditions. i o Assess the presence of petroleum hydrocarbons (if any) in the soil and/or ground- water beneath the site. i o Verify the soil conditions at the location of the proposed new and former underground fuel storage tank cluster. o Evaluate the need for further assessment and/or mitigation of petroleum constituents in soil and/or groundwater beneath the site, prior to the tank closure/replacement. 1.2 Scope i o j Drill .four soil fjorin s in the area of the existingunderground fuel storage tanks 9 i r9 _ (UST) and four soil borings in the proposed UST to a mi_nim_ um depth-of 20-feet' below ground surface (bgs). o -Drill two borings to a minimum depth-of-10-feet-bgs around each 'of the-four pump islands 8 to asses the conditions of the existing-product-lines. -- o Drill one soil boring per 30 feet of product lines (1), to an estimated depth of five feet bgs. o Recover from each of the borings a representative soil samples at five-foot intervals and classify the recovered soil samples according to the Unified Soil Classification System. Screen the recovered soil samples for the presence of organic vapors with a photoionization detector. 91-013A.RFr 1 I I