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i Additional Subsurface Investigation And Well Installation Report 3 The Southland Corporationt store#19976, 1399 N Main St Manteca Califomia November 15 1998 Table 2 summarizes the laboratory analytical results of groundwater samples collected from three soil bonngs GP-1,GP-2, and GP-3 on Apnl 29, 1998 Benzene and TPH-G ranged from 21 micrograms ' per Ider(pg/L) and 1,600 pg/L, respectively In sample GP-2-W,to 5,800 pg/L and 290,000 pg/L, respectively In sample GP-3-W MTBE was detected in samples GP-1-W, GP-2-W,and GP-3-W at concentrations of 430 pg/L, 16 pg/L, and 4,200 pg/L, respectively MTBE was confirmed In sample GP- 1-W and GP-3-W at a concentration of 380 pglL and 3,700 pg/L, respectively, using EPA method 8260 Addihonal assessment was conducted to further delineate hydrocarbons in soil and groundwater at the site, as required by the SJCPHS ' 3.0 SOIL AND GROUNDWATER ASSESSMENT WORK ' 3.1 Permitting/Site-Specific Health and Safety Plan Permits for the Installation of the three groundwater mondonng wells were applied for and obtained from ithe SJCPHS Following a complete review of site conditions, Fluor Daniel GTI revised the existing site-specific Health and Safety Plan as required by the Occupational Safety and Health Administration Standard Hazardous Waste Operations and Emergency Response guidelines (29 Code of Federal Regulations 1910 120) The document was reviewed and signed by all Fluor Daniel GTI personnel and subcontractors pnor to commencement of work at the site 3.2 Soil Bonngs On September 2 and September 3, 1998, Fluor Daniel GTI supervised the drilling of two soil Bonngs to a ' depth of 30 feet BGS and one soil bonng to a depth of 50 feet BGS using a drilling ng equipped with an 8-Inch and 10-Inch diameter hollow-stem augers All drilling equipment was steam cleaned pnor to drilling each boring, and sampling equipment was washed in an Alconox'(detergent) solution and rinsed with water between sampling Intervals All soil and nnse water generated during the drilling was placed in labeled Department of Transportation (DOT)-approved 55-gallon drums and left on the site pending transportation and disposal r 1907easr rpt FLUOR DANIEL GTI