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NF_4R DOCUMENTATION 1.0 Site History and Current Site Conditions The Speedy Food Mart (Site) is located at 8200 N. Highway 99, the northeast corner of the intersection of Frontage Road and Foppiano Lane, in Stockton, California (A-PN 08531010). A vicinity map is included as Figure 1. The 2.18 acre parcel is bounded by a vacant field to the east, Foppiano Lane to the south, Frontage Road and Highway 99 to the west, and residences to the north. The area is designated as being undeveloped urban and is currently used primarily for agricultural purposes with the closest residential tract located approximately 300 feet north of the former underground storage tanks(USTs). The property formerly operated as a gasoline station with tluee 8,000-gallon gasoline USTs and associated fuel dispensers which were removed in 1998. A Mini Mart and panting lot currently sit on southwestern most 0.36 acres of the Site and fuel is no longer dispensed. The remaining 1.82 acres is vacant undeveloped land. 1.1 Chronology On January 28, 1998, three 8,000-gallon USTs, dispenser pumps, and piping used to store and convey gasoline were removed from the Site. Contamination was noted during removal of the USTs and soil samples were collected from beneath the removed USTs and the pump island. The soil samples revealed the presence of petroleum hydrocarbon constituents. The excavation measured approximately 25' x 30' x 15' deep. As an interim abatement measure, the excavation was lined with black plastic, and the soil was returned to the hole. Details are discussed Ground Zero Analysis, Inc.'s (Ground Zero) Speedy Mart Groundwater and Soil Investigation dated February 24, 1999. On September 23, 1998, William J. Hunter, RG, of Wm J. Hunter & Associates (Hunter & Associates) supervised the excavated p�oxi_m�ttely 166 cubic_ 11-dS (Vd3 of iM13 ►rtPft !;n;r by r;m Thorpe Oil, Inc (Thorpe). Additional subsurface investigation and assessment work was performed by Ground Zero in November 1998. The investigation consisted of drilling two pilot borings (CPT] and CPT2) using a cone penetrometer testing drill rig to identify subsurface lithology. Then soil samples were collected from three borings (SBI, SB2, and SB3) at significant changes in lithology, based upon the CPT data collected from the pilot borings. Details are discussed in Ground Zero's Speedy Mart Groundivater and Soil Investigation date February 24, 1999. On October 4, 1999 through October 8, 1999 Growid Zero persorulel supervised Spectrum Exploration Inc. (Spectrum) during the advancement of two borings (SB4 and SB5) as well as the installation of four groundwater monitoring wells (MW 1 through MW4). The newly installed groundwater monitoring wells developed between October 12 and 13, 1999. On February 28, 2000, Ground Zero personnel supervised Welenco in conducting a video survey of the water supply well to determine well construction details and evaluate the integrity of the well casing. Details are discussed in Ground Zero's Groundwater Monitoring Well Installation Report dated April 28, 2000. G:ZROUNDZEIl"ULEUERG\Rcpons\OdicMppeudix A Site Closure Rcpomdoc I