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SC&D Boyett Petroleum 419 South Main Street October 27, 1999 Manteca, California Page. 2 The soil samples submitted for analysis from both the stockpiled soils and the dispenser locations were analyzed for gasoline by EPA method M 8015, BTX&E along with MTBE were analyzed by EPA method 8020. On October 5, 1998, WHF, Inc. (WBF) in conjunction with Fisch Environmental Exploration Services, a state licensed drilling contractor, completed two (2) vertical soil borings, SB-1 and SB-2, to a maximum depth of eighteen (18) feet near the fuel dispenser island. The data collected was utilized to evaluate the presence or absence of contamination in the shallow subsurface and groundwater underlying the fuel dispensers. Soil samples were taken from all borings at five (5) foot intervals for soil classification. Three (3) soil samples were selected from each boring at 4-6 feet, 9-11 feet, and 16 feet for laboratory analysis. One (1) groundwater sample was collected from the termination point at eighteen(18) feet for laboratory analysis. 3.0 Scope of Work On August 27 and 30, 1999, WHF, Inc., in conjunction with Frontier Drilling, a state licensed drilling contractor, completed four (4) soil borings, that were converted to monitoring wells, to a depth of approximately 30' bgl. (groundwater depth —18') to confirm the presence or absence of petroleum hydrocarbons and the vertical extent of the soil contamination in the unauthorized release area. The actual depth of the wells varied between 26.5' and 36.5'. The event provided data to evaluate the soil contamination at the dispenser island, and the extent of groundwater contamination underlying the site (Figure 2). Soil boring/monitoring well locations are identified in Figure 3 of this report. 3.1 Drilling The soil borings were accomplished using a mobile mounted drilling rig employing the use of a hollow stem flight auger whose outer diameter was no less than 8 inches. All drilling equipment was thoroughly steam-cleaned before drilling began, to prevent the introduction of contamination from off site, and between borings to prevent cross contamination. The borings were logged under the direct supervision of a registered professional using the Unified Soil Classification System (Appendices A & D). The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock characteristics, and any evidence of