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S E C 0 R r� �i Mr Ed Ralston September 7, 2004 Page 3 � impact in soil and groundwater downgradient of the site and to determine the placement of wells that will complete delineation of the plume • Health and Safety As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR prepared a site-specific Health and Safety Plan (HASP) Prior to the commencement of fieldwork, the HASP was updated with appropriate field personnel and subcontractor information The field staff and contractors reviewed the HASP before beginning field operations at the site • Permitting Prior to initiating work, SECOR obtained soil boring and well installation permits form SJCEH, encroachment permits form the City of Lathrop, and obtained an access agreement to 16200 Cambridge Street SJCEHD soil boring and well installation permits and City of Lathrop encroachment permits are included as Attachment B • Geoprobe Soil Borings The off-site exploratory geoprobe soil borings were advanced r� using standard direct push equipment to an approximate depth of 15 feet bgs Soil samples were collected at depths of 5, 10, and 15 feet bgs for logging purposes with the 10 and 15 foot samples submitted for laboratory analysis Temporary casing was installed in each boring and a groundwater"grab" sample was collected at each geoprobe boring location with a clean disposable bailer Boring logs are included as Attachment C • Soil Analytical Results Soil samples at 10 and 15 feet bgs from geoprobe borings GP-10 through GP-14 were collected and submitted for laboratory analysis Soil samples were analyzed for TPHg, BTEX, and fuel oxygenates (MtBE, EtBE, DIPE, TAME, TBA, EDB, 1,2- DCA, and ethanol) by EPA Method 8260B TPHg, xylenes, and ethanol were reported In soil sample GP-13@10 at concentrations of 1 2 mg/kg, 0 0095 mg/kg, and 0 65 mg/kg, respectively The laboratory report noted that the TPHg detection did meet the gasoline standard No detectable concentrations of petroleum hydrocarbons were reported in the soil samples from GP-10, GP-11, GP-12, and GP-14 Soil analytical results are included in Table 1 Field and laboratory procedures are presented in Attachment D The certified laboratory analytical report and chain-of-custody documentation are presented in Attachment E • Groundwater Analytical Results Groundwater "grab" samples collected from each of the geoprobe boring locations were analyzed for TPHg, BTEX, and fuel oxygenates (MtBE, EtBE, DIPE, TAME, TBA, EDB, 1,2-DCA, and ethanol) by EPA Method 8260B L MtBE was reported at a concentration of 0 88 ug/L In boring location GP-12 and ethanol was reported at a concentration of 610 ug/L in boring location GP-13 Groundwater analytical results are rl included in Table 2 and shown on Figure 2 The certified laboratory analytical report and chain-of-custody documentation are presented in Attachment E iI • Stockpiled Soil One drum of soil was generated during the assessment activities Filter Recycling Service removed the drum for proper disposal w a 1ConocoPhdlipslTosco Markelrng1120511Reportslgeoprobe rpt 9-04 doc