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S E C 0 R 76 Station No. 11193 August 13, 2004 Page 6 Site Health and Safety Plan As required by the Occupational Health and Safety Administration (OSHA} Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section te 5192), SECOR updated the current site-specific Health and Safety Plan (HASP) prioro commencement of fieldwork. The HASP was reviewed by field staff and contractors before beginning field operations, and was in the possession of SECOR personnel while conducting work activities at the site. Permitting Well construction permits for the OS wells were approved by the SJCEHD on March 12, 2004, OS Well Installation From March 31 through April 2, 2004, SECOR field staff supervised Water Development Corporation (WDC) drill 10 eight-inch diameter soil borings for the installation of the OS wells (OS-1 through OS-10). The borings were drilled using hollow stem auger and hollow stem auger/limited access rig drilling equipment. OS-5, OS-8 and OS-9 were drilled using the hollow stem auger/limited access rig and the others were drilled using the standard full- size hollow stem auger drill rig. The locations 'of the wells were selected based on an assumed'30-foot radius of influence, to maximize the remedial coverage in the vicinity of the USTs and along the eastern/northeastern perimeter of the site (Figure 2). OS-5 was installed 3 feet east of the original location due to a concrete obstruction and OS-9 was installed 3 feet west of the original location due to a 2-inch polyvinyl chloride (PVC) conduit located 1-Y2 feet bgs during hand angering. The installation of the OS wells was conducted according to the work plan. Upon completion of drilling, a 1.25-inch diameter, schedule 80 PVC casing equipped with a 2.5-foot long OS diffuser tip and six inch coupler was installed in each borehole at depths of 30 feet bgs. A #2116 sand pack was placed in the annular space across the entire sparge tip interval, extending 2 feet above the top of the sparge tip to a depth of 25 feet bgs per well. A 2-foot bentonite transition seal was placed atop the sand pack to 23 feet bgs, followed by neat cement grout to the ground surface. Well construction details are included in Table 1. Boring logs are included Attachment 1. Soil Selection and Analysis A soil sample was collected from the stockpile for laboratory analysis. The sample was placed in a cooler with ice and delivered to California state-certified Severn Trent analytical laboratory in San Francisco under chain-of-custody protocol and analyzed for the presence of TPHg, BTEX, and MtBE by EPA Method 8260B (Single Run). MtBE was reported in the sample at 0.041 mg/Kg. This sample was the only soil sample sent to the laboratory for analysis,.which is a departure from the September 15; 2004 work plan which called for the analysis of 3 soil samples from ozone sparge well boreholes. I 1:\Conoco P hillips\Tosco Marketing1111931Reports\0zone Well install Rpt 6-04 recovered.doc