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First Quarter 2006 Groundwater Monitoring and Remediation Status Report <br /> . Cohn Property 3755 Munford Avenue,Stockton,California <br /> Page 3 <br /> August 24, 2005 - Apex performed a startup test of the soil vapor extraction system under the <br /> supervision of the San Joaquin Valley Air Pollution Control District (SJVAPCD) A report <br /> detailing startup activities is currently being prepared <br /> September 8, 2005 - Apex submitted the results of a source test conducted at the site, titled <br /> Source Test Results Summary for Authority to Construct Permit No N-5817-1-0 <br /> October 4, 2005 - Apex submitted a workplan proposing the installation of an ozone air sparge <br /> system and updated site conceptual model <br /> October 4, 2005 - Apex submitted Workplan for Deep Groundwater Monitoring Well <br /> Installation, proposing to install two deep groundwater-monitoring wells (MW-11 through MW- <br /> 14) <br /> January 18, 2006 - Apex submitted Ozone Sparging Bench Scale Test Workplan to the Central <br /> Valley Regional Water Quality Control Board, proposing to perform an ozone bench scale test to <br /> evaluate ozone sparging as a remedial option <br /> February and March 2006—Apex supervised the installation of monitoring wells MW-11 <br /> through MW-14 A results report summarizing field activities is currently being be prepared <br /> GENERAL SITE INFORMATION <br /> Site name: Cohn Property <br /> Site address: 3755 Munford Avenue, Stockton, California <br /> Responsible party: Mr Phil Cohn <br /> Current site use: Manufacturer of small boat trailers <br /> Current phase of project Groundwater monitoring/ Active remediation <br /> Tanks at site- None <br /> Number of wells 14 monitoring wells, one onsite domestic well, 3 vapor <br /> extraction wells, 2 piezometers, and 1 air sparge well <br /> GROUNDWATER MONITORING SUMMARY <br /> Domestic well sampling date: February 9, 2006 <br /> Gauging and sampling date: March 20-21, 2006 <br /> Wells gauged and sampled MW-1 through MW-12 and MW-14 <br /> Wells gauged only: MW-13 <br /> Wells sampled only DW <br /> Groundwater flow direction, Northwest <br /> Groundwater gradient: 0 0067 ft/ft <br /> Laboratory Analytical Sciences, Petaluma, California <br />