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Additional Site Assessment Report and Corrective Action Work Plan 2 The Southland Corporation,Store#20632 4627 DaVinci Drive,Stockton CA January 8 1997 the existing site-specific Health and Safety Plan as required by the Occupational Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response"guidelines(29 CFR 1910 120) The document was reviewed and signed by all Fluor Daniel GTI personnel and subcontractors prior to commencement of work at the site 3.2 Soil Borings On September 21 and 22, 1997, Fluor Daniel GTI supervised the drilling of four soil bonngs to depths ranging from 16 5 to 21 5 feet below ground surface (BGS) utilizing a truck-mounted drill rig equipped with 84nch outside-diameter(O D) hollow-stem augers All drilling equipment was steam cleaned prior to drilling each boring,and sampling equipment was washed in an Alconox(detergent)solution and rinsed with water between sampling intervals All soil and steam-clean water generated during the drilling was placed In labeled Department of Transportation (DOT)-approved 55-gallon drums and left on site pending transportation and disposal 3.3 Soil Sample Collection Sod samples were collected from each borehole at 5-foot depth Intervals from 5 feet BGS to total depth Samples were collected using a 24nch O D.California split-spoon sampler, lined with three 1 54nch- diameter by 64nch4ong brass tubes The sampler was driven 18 Inches ahead of the augers at each sample point Soil samples were field screened for hydrocarbon vapors using a photo4onization detector (PID) Soil was logged using the Unified Soil Classification System by a Fluor Daniel GTI field geologist working under the supervision of a Califomia registered geologist(Appendix A) One sample tube from each sampling Interval was sealed, labeled and placed on ice in an Insulated container for transport under chain of custody to state-certified West Analytical Labs(WEST)in Davis,Callfomia for analysts A total of ten soil samples were submitted for laboratory analysis of benzene,toluene,ethylbenzene and total xylenes(BTEX),MTBE and TPH-G using U S Environmental Protection Agency(EPA) methods 8020/modified 8015. Samples were addMonally analyzed for tert butanol(TBA), MTBE,di-isopropyl ether (DIPS),ethyl-tent-butyl ether(ETBE),and tert-amylmethyl ether(TAME) by EPA method 8260 In addition to the samples collected from the borings.four soil samples were collected from the drummed soil and combined Into a single composite sample In the laboratory,for soil disposal characterization purpose The composite sample from the drummed soil(Drum A,B,C,and D)was analyzed for BTEX and TPH-G by EPA methods 8020/modified 8015,and total lead by EPA method 6010 3A Groundwater Monitoring Well Installation/DeveiopmentlSurveying On September 21 and 22, 1997,four groundwater monitoring wells were installed in the four borings(MW- 1,MW-2,MW-3,and MW-4)at the locations shown on Figure 2 The groundwater monitoring wells were constructed of 24nch-diameter,schedule 40 polyvinylchloride(PVC)casing with flush threads,and 0.020- Inch-slot well screen The well screen was Installed in borings MWA through MW-3 from 4 5 feet to 14 5 feet BGS,and in boring MW4 from 4 5 feet to 20 feet. Sand was placed in each well annulus from the FLUOR DANIEL GTI 20632*tr apt