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I 1.3 Resources I Sean Garvey, a Ground Zero''geologist, directed fieldwork on May 6, 1999. Fisch Environmental (Fisch), a State 'licensed drilling company (C57-683685), performed drilling services. Argon Laboratories, Inc. (Argon), al California state-certified hazardous waste testing laboratory (FLAP 2359), completed the laboratory analyses for all samples. 2.0 BACKGROUND INFORMATION 2.1 Site Description The site is currently operated as an aerial agricultural chemical application service by Haley Flying Service,-Anc. The facility previously utilized one 10,000-gallon UST for storage of aviation fuel (Figure 2). The UST was removed under permit from PHS/EHD on May 16 1990. A soil sample collected beneath the tank, and a water sample collected from the UST excavation contained petroleum hydrocarbons at levels exceeding the respective laboratory detection limits. Analytical results are summarized in Table 1. 2.2 Investigations Undertaken In accordance with the approved workplan dated April 20, 1999, three soil borings were advanced at the site to investigate the lateral and vertical extent of residual soil contamination, as well as the potential impact to groundwater. Boring SBI was located in the center of the former UST location. Boring SB2 was located approximately 25 feet north of boring SB 1, and boring SB3 was located 25 feet southeast of boring SB 1..Soil boring locations are depicted on Figure 2. 3.0 INVESTIGATIVE PROCEDURES On May 6, 1999; Sean Garvey of Ground Zero arrived at the site to supervise the subsurface investigation in the vicinity of the former UST. Ms. Carol Oz of San Joaquin County Public PHS/EHD conducted a site inspection and observed field activities. Fisch advanced.the borings under the supervision of field geologist Sean Garvey, and project manager John Lane, a California Registered Geologist. Boring SBI was advanced to a depth of } approximately 22, feet below ground surface (bgs). Borings SB2 and SB3 were advanced to approximately 16'Ifeet bgs to explore the lateral extent of contamination at the site. Fisch utilized a truck mounted Geoprobe 5400 direct push rig to advance the borings and collect soil samples. Soil samples were collected at 5=foot'intervals using a 1-inch diameter by 24-inch long core sampler. The sampler was lined with clear acetate sleeves, affording soil identification and subjective evaluation for contamination. A flame ionization detector (FID) was used to monitor the presence of volatile organic compounds in the soil. Three soil samples from boring SBI were sealed, labeled; and immediately placed in an iced cooler for transport to a state-certified analytical laboratory. One soil sample each from SB2 and SB3 were also submitted for analysis. Soil samples were selected based on observations and field screening results. Ili datalgroundzelhaleylsummary.doc 2 y 4 ,