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Page 3 of 3 <br /> Once the system is in operation the following constituents should be monitored on a <br /> bimonthly basis: Injected ozone/air flow-rates; injection well pressure, monitoring well <br /> pressure;ground water measurements - pH; conductivity, dissolved oxygen, and ozone. <br /> Ferrous iron if present in concentrations over 25 milligrams per liter can precipitate and <br /> cause plugging of the sparge point and aquifer materials. Therefore we recommend <br /> Analyzing ground water samples for iron at the next quartedy monitoring event. <br /> We will analyze operating data and estimate the ozone zone of influence and <br /> effectiveness of ozone in reducing dissolved ground water concentrations. if the first two <br /> quarters of operation indicate that ozone injection is feasible, we will develop additional <br /> recommendations for larger-scale implementation if appropriate. A report of the findings <br /> of the pilot operation will be prepared for submittal to PHS EHD. The report will <br /> describe and interpret system operating results and ground water analytical data, <br /> If you have any questions, please call the undersigned. <br /> Sincerely, <br /> Wright Environmental Services, Inc. <br /> i <br /> John Lynch R. Mag4Qadir, Enpro Solutions, Inc.) <br /> President CH 476 <br /> Attachments:Figures 1 and <br /> ference _l <br /> Wright Environmental Services, June 20, 2003 (Wright 2003a) Project No_ 4233-3 to 77 <br /> Trust of Mary Gardella 525 r' Street, Santa Cruz, California 95060, Attn.: Ms. Winifred <br /> Alexander Re* [Monitoring Well Installation, Sampling and Assessment, Addendum to ; <br /> Workplan Dated April 25,2003, Stefanos Gasoline 1419 Charter Way, Stockton, CA, 5 <br /> pages. <br /> r�Da rr JS <br /> Wright Environmental Services,July 28,2003 (Wright 2003b)Project No. 4233-3 to l �T <br /> Trust of Mary Gardella 525 YA Street, Santa Cruz,California 95060,Attn.: Ms. Winifred e <br /> Alexander Re; Quarterly Ground Water Monitoring Report, Farmer Stefano$Gasoline <br /> Station 1419 East Charter Way Stockton, California, 8 pages with attachments. <br /> Gregg In Situ Inc.,Environmental report dated March S. 2002,Premdation of Cone <br /> Penetrometer Test Data, Stefanos.Gas 1419 East Charter Way Stockton, California, 5 <br /> pages with attachments. <br /> Rarnage Environmental report dated April 25, 2003, Ground Water Monitoring Report <br /> First Quarter 2003,Former Stefanos Gasoline Station 1419 Fast Charter Way Stockton; <br /> California, 8 pages with attachments. <br />