ARCHIVED REPORTS XR0007834 - Laserfiche WebLink

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a., Ms Lon Duncan May 20, 1999 Page 2 of 6 1.3 -Resources Sean Garvey, a Ground Zero geologist, directed field work on January 19, 1999 Fisch Environmental (Fisch), a State licensed drilling company (G-57-683685), performed drilling services McCampbell Analytical Laboratories, Inc (McCampbell), a State certified hazardous waste testing laboratory(FLAP#1282), completed the laboratory analyses for all samples 2.0 BACKGROUND INFORMATION 2.1 Site Description The site previously operated as an automotive sales and service center and utilized one 250- gallon UST for storage of waste oil The UST was removed under permit from PHS/EHD on March 26, 1997 A soil sample collected from beneath the tank contained elevated levels of petroleum hydrocarbons, lead, and chlorinated solvents Analytical results are summarized in Table I Groundwater beneath the site was expected to be encountered at approximately 25 to 30 feet below ground surface (bgs), based on historical information available from the San Joaquin County Flood Control and Water Conservation District 2.2 Investigations Undertaken • Based on the background information provided to Ground Zero, three soil bonngs were advanced at the site to investigate the lateral and vertical extent of residual soil contamination, and the potential impact to groundwater Boring SBI was located approximately 15 feet northwest of the former UST, boring SB2 was located approximately 20 feet southwest of the former UST, and boring SB3 was located in the center of the former UST excavation A fourth boring proposed in the workplan co ld not be advanced because of slower than expected dnlling caused by very stiff soil conditions The former UST was located approximately 100 feet south of the Park Street entrance and approximately 53 feet west of the entrance to the alley that borders the east side of the building Soil boring locations are shown on Figure 2 3.0 INVESTIGATIVE PROCEDURES On January 19, 1999, Sean Garvey of Ground Zero arrived at the site to supervise the subsurface investigation in the vicinity of the former UST Ms Lon Duncan and Mr Jeffery Wong of San Joaquin County PHS/EHD conducted separate site inspections to observe field activities Fisch advanced the bonngs render the supervision of field geologist Sean Garvey, and project manager John Lane, a California Registered Geologist Borings SB I and SB2 were advanced to a depth of approximately 31 feet below ground surface (bgs), and boring SB3 was advanced to approximately 36 feet bgs Fisch utilized a truck mounted Geoprobe 5400 direct push ng to groundzelgabbard`sunupt doe