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GENERAL WORKPLAN SUBSURFACE SOIL SAMPLING — UNDERGROUNED TANK LOCATION 4204 NORTH SUTTER STREET In accordance with your request, we have prepared this workplan for the collection of soil samples from the subject site for laboratory analysis. This letter includes a description of our proposed work elements. The subject property is located within an established residential area of Stockton, San Joaquin County, California. The approximate 12.81 -acre subject property is accessed by a private road that fronts on North Sutter Street, approximately 450 feet to the west. The subject property is bounded by the Calaveras River corridor to the north, by vacant land and an abandoned cherry orchard to the east, and by a former railroad easement and residential property to the south. The Sierra Christian Elementary School, the easterly terminus of Fargo Street, and residential property are situated adjacent to and easterly of the subject property. The San Joaquin County Assessor's parcel numbers (APNs) for the property are 115-230-06 and 115-230-07. • In February 1989, a 1000 -gallon underground gasoline storage tank was removed from the approximate central portion of the property (see plate 2). According to property owner Ms. Lorain Cabral, very limited stained soils were observed at the surface around the tank's fill port at the time of removal. Ms. Cabral could not recall soil conditions beneath the tank following its removal. Available County records indicate that no soil samples were collected for laboratory analysis during the 1989 tank removal activities. Soil sampling and laboratory analysis of subsurface soils within the former tank location was recommended. We will direct the advancement of two soil borings (Geoprobe borings) within the area of the former underground gasoline storage tank and collect up to six soil samples for laboratory analysis. Prior to the described Geoprobe sampling activities, we would contact Underground Service Alert to clear the boring locations of underground utilities. Additionally, we would direct a geophysical survey to further clear the boring locations. All drilling and sampling activities would be overseen by a Professional Geologist from our office. Continuous soil sampling would be performed in each of the two borings within the former underground tank area. Following the sampling activities the borings would be backfilled with neat -cement grout and surfaces would be patched accordingly. Selected soil would be submitted to a State -certified analytical laboratory for chemical testing. Four analyses for total petroleum hydrocarbons (TPH) as gasoline, MTBE, BTEX, and total lead would be performed by a State Certified analytical laboratory.