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1117 Lone Palm Avenue, Suite 201 (YA Modesto, California -2221209-579-2221 Fax: 209-579-2225 ASSOCIATES INC . detailed in ATC 's Final Remediation Plan, Farmer Property, 610 North Hunter Street, Stockton, California, dated March 27, 2002. Additionally, in December 2001 , an ATC geologist supervised the advancement of five Geoprobe borings, SB 12 to S1316 to a depth of approximately 25 feet bgs. Three additional offsite borings were advanced to depths of approximately 42 feet bgs and completed as groundwater monitoring wells, MW8 through MW10. Field activities and analytical results were detailed in ATC' s Offsite Subsurface Investigation Report, dated April 24, 2003 . In December 2003, ATC implemented remedial activities at the site. The remedial activities consisted of soil vapor extraction (SVE) coupled with air sparging (AS). The SVE system was designed to utilize up to five extraction wells (VWI through VW4 and MWl) and the AS system was designed to utilize up to two AS wells (ASI and AS2). The current SVE system consists of a 300 actual cubic feet per minute (ACFM) thermal oxidizer. The AS system consists of a GAST 2567-PI32-T908X rotary vane, 2- horsepower, air compressor. This blower is capable of injecting at a maximum of 20 pounds per square inch (PSI) at low flow rates. The maximum flow rate is approximately 21 standard cubic feet per minute (SCFM) . Accumulated groundwater from the extraction wells is treated and discharged to the City of Stockton sewer system. OZONE BENCH SCALE STUDY An ozone bench scale study was described in the previous workplan submitted by ATC to the SJCEHD titled Workplan to Conduct a Feasibility Study for Ozone Pilot Testing dated August 6, 2008 . Once a sufficient volume of soil and groundwater samples have been collected, ATC will submit these samples under chain of custody documentation to Prima Environmental, Inc. and an ozone bench scale study will be conducted in accordance with the workplan. SCOPE OF WORK This workplan has been prepared to collect soil and groundwater samples from the site for the purpose of conducting an ozone treatment bench scale study for the consideration of ozone sparging as a remedial approach for the site. The scope of work includes submitting a soil boring permit application to the SJCEHD for review and approval, advancing two vertical soil borings at the site, collecting soil samples from the, proposed soil borings, collecting a groundwater sample from groundwater monitoring well MW3 , and submitting the soil and groundwater samples to an analytical laboratory to conduct the bench scale study. Planning and Permitting ATC will schedule field personnel and equipment, notify Underground Services Alert to locate underground utilities as required, and perform other necessary field preparation and job start-up activities. A private utility locating service will also be used to locate underground utilities that may be present in the work areas. A drilling permit application will be completed and submitted to the SJCEHD prior to initiation of drilling activities. s:\environmental\62596\reports\workplan for soil sampling 3