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' Chevron Products Company Page 3 <br /> Chevron Service Station 9-0557 139 South Center Street Stockton California Se tem6er 18 2002 <br /> OZONE SPARGE PILOT TESTING <br /> • The OS system is comprised of the four dual-completion sparge wells (OS-IS/ID, OS- <br /> 2S/2D, OS-3S/3D, and OS-4S/4D), whose installation is described above, connected by <br /> mechanical piping to a six spargepoint KVA C-SpargerTm ozone generator. The OS pilot test <br /> commenced on March 29, 2002. Since startup, OS testing has been performed only using <br /> wells OSAS, OS-1D, OS-2S, OS-213, OS-3D, and OS-4D. Groundwater monitoring and <br /> sampling was performed prior to initiation of OS and approximately monthly thereafter. <br /> Wells within or near the treatment area (MW-1, MW-2, MW-9, MW-9A, MW-9S, MW-10, <br /> and MW-11) were monitored for the following parameters: dissolved oxygen (DO) and <br /> ferrous iron concentrations, pH, and oxidation-reduction potential (ORP). In addition, <br /> groundwater samples were collected and analyzed for total petroleum hydrocarbons <br /> quantified as gasoline (TPHg), TPH quantified as diesel (TPHd), TPH quantified as motor oil <br /> (TPHmo), benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl ether <br /> MtBE Laboratory analytical results and chains-of-custody for the groundwater samples y <br /> collected by SECOR during the period reported herein are presented in Attachment C. Data =,t <br /> sheets for the ozone sparge testing are presented in Attachment D. Groundwater analytical <br />' results and field monitoring results are presented in Tables 1 and 2, respectively. The OS <br /> pilot test will continue through the end of 2002. <br /> If you have any questions regarding the contents of this report, please contact Bill Brasher of <br /> SECOR at (916) 861-0400 ext. 284 or Bob Cochran of Chevron at (925) 842-9655. <br /> Sincerely, <br />' SECOR International Incorporated <br /> Etlzabetli otenhuis William E. Brasher, P.E. <br /> Staff Scientist Project Manager <br />' Ma <br /> Attachments: Figure 1 -- Site Locationp <br /> Figure 2 --Site Plan <br /> Attachment A--Field and Laboratory Procedures <br />' Attachment B —Boring Logs with Well Construction Details <br /> Attachment C —Laboratory Reports and Chain-of-Custody Documents <br /> Attachment D —Ozone Sparging Pilot Test Field Data Sheets <br /> cc: Bob Cochran, ChevronTexaco Environmental Management Company, San Ramon, CA <br />' Marty Hartzell, Regional Water Quality Control Board, Sacramento, CA <br /> Sheldon Nelson, Chevron Research and Technology Company, San Ramon, CA <br /> I <br />' l:\Chevron1905571REPORTSICAPICAP Progress Reports\Well Install&OS Progress.doc <br />