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08/18/2003 11:10 20983251' WRIGHT ENVIRONMEP- PAGE 04 <br /> vkno� Nowr <br /> 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 vel <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 quarterly 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 t:uo <br /> quarters of'operation indicate that ozone injection is feasible,we will develop additions..) <br /> recommendations for larger-scale implementation if appropriate. A,report of the findin,.,s <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 /> John Lynch R. Maqbool Oadir, PE (Enpro Solutions, Inc.) <br /> President CH 4767 <br /> Attachments: Figures 1 and 2 <br /> References <br /> Wright Environmental Services, .lune 20, 2003 (Wright 2003a) Project No_ 42.3- <br /> 3 to Trust of Mary Gardella 525 2nd Street, Santa Cruz, California 95060, Attu_: <br /> Ms. Winifred Alexander Re: Monitoring Well Installation, Sampling and <br /> Assessment, Addendum to Workplan Dated April 25,2003, Stefanos Gasoline <br /> 1419 Charter Way, Stockton, CA, 5 pages_ <br /> Wright Environmental Services, July 28, 2003 (Wright 2003b) Project No. 4233,3 <br /> to Trust of Mary Gardella 525 2"d Street, Santa Cruz, California 95060, Attn.: Ms. <br /> Winifred Alexander Re: Quarterly Ground Water Monitoring Report,Former Stefar os <br /> Gasoline Station 1419 East Charter Way Stockton, California, 8 pages with attachmerrL. <br /> Gregg In Situ Inc.,Environmental report dated March 8,20OZ,Presentation of Cone <br /> Penetrometer Test Data, Stefanos Oras 1419 East Charter Way Stockton, California, 5 <br /> pages with attachments. <br /> Ramage Environmental report dated April 25,2003, Ground Water Monitoring Report <br /> First Quarter 2003,Former Stef nos Gasoline Station 1419 East Charter Way Stockton. <br /> California, 8 pages with attachments. <br />