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• v SEcC ® R Former BP Station# 11193 September 22, 2004 Y Page 6 Upon completion of drilling, a 314-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 approximately 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 at a depth of 25 feet bgs per well Bentonite transition seals measuring 2 feet long were placed atop the sand packs to 23 feet bgs, followed by neat cement grout to the ground surface MARCOR Environmental completed the OS system installation on May 7, 2004 OS system components include a remediation compound, a KVA C-spargeTM panel, a ten-point infection manifold, and buried 318-inch diameter, and high density polyethylene (HPDE) system lines contained in 2 to 6-inch diameter PVC conduits Each point on the injection manifold is equipped with an electrical solenoid, which controls the flow of ozone/air mixture to the ozone sparge wells The solenoids are controlled by a timer, which is programmed to sequentially infect into each well for 7 minutes (70 minutes total for each cycle), 18 times a day (18 cycles per day) The sparge panel is equipped to with a compressor rated to deliver 6 standard cubic feet per minute at 10 pounds per square inch Upon completion of the OS system installation, the system was brought on-line on May 25, 2004 As part of the monthly system operation and maintenance, SECOR checks and maintains equipment, and monitors the OS system for fugitive ozone emissions in lateral piping trenches and well boxes The OS system will be operated until remediation goals are . achieved, or until the remediation effort is shown to no longer be technically or economically feasible Reports documenting the performance of the OS system are submitted quarterly They include a summary of remediation system performance, and an evaluation of dissolved petroleum hydrocarbon concentrations detected in site groundwater monitoring wells to determine whether OS is an effective technique for reducing petroleum hydrocarbon concentrations in soil and groundwater beneath the site Site groundwater monitoring and sampling will continue on a quarterly basis using the existing monitoring well network consisting of 13 wells SECOR incorporates the data collected into a groundwater monitoring and system efficiency report that is submitted on a quarterly basis The quarterly reports include a summary of system operation, monitoring and sampling results, field notes, certified analytical laboratory data, and tables summarizing the field and analytical data COMPLETED SCOPE OF WORK ' 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 5192), SECOR updated the current site-specific Health and Safety Plan (HASP) prior to the commencement of fieldwork The HASP was reviewed by field staff and contractors before CPT Report 9-04 doe