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"#t911fTe2('(iw# ' �1' ryr -�- .l:€� r A Lr <br /> i �,ustFrvl^�n�Jr - <br /> i €r i 11 i L i L L <br /> _7 iA tf At'$ ih Pk r.A-+� rr <br /> . t l i <br /> APES - W s: 0 - 00 OCT _3 AM o 1, <br /> 11,244 Pyrites Way•Gold River,CA 95670 <br /> ENV- I R 0 T E C H , � N; C . Phone 916851.01.14 Fax 916.851.0117• Toll Free 1.800.242.5249 <br /> R <br /> September 26, 2003 <br /> Mr. Nuel Henderson T <br /> San Joaquin County Environmental Health Division <br /> P. O. Box 2009 T <br /> Stockton, California 95201, f` ; <br /> Subject: ' = Workplan for Ozone Sparging <br /> Moore Petroleum"Bulk Plant ` <br /> 5491 F Street, Banta, California- <br /> Apex Project#ERA02.004 <br /> Dear Mr. Henderson: <br /> Apex Envirotech,.Inc. (Apex);has been`authorized,by Moore Petroleum.(Moore) to provide this ; <br /> report,proposing the addition of ozone sparging to the reme'diation'�,s stem at the subject site <br /> (Figure 1 and 2)., Groundwater monitoring and sample collection has been performed quarterly <br /> since the installation of the current soil vapor• extraction (SVE) remediation systema In addition, <br /> the domestic well at 5451_ F.Street was sampled monthly during the quarter and the.results of <br /> those events are included: in this report. Based •on the'results'`obtained-during quarterly <br /> monitoring, the groundwater petroleum constituent concentrations,liave not declined,appreciably <br /> with the operation of the system and concentrations are now,apparent at well.MW-12 (Table 1). <br /> Therefore, ozone sparging is proposed• to oxidiz­111e.-the :petroleum' constituents at the. soil <br /> groundwater interface around the north; east and south of the building, with'a focus on reducing <br /> petroleum constituent concentrations'::along` he..6th Street side.'This would reverse the <br /> concentration gradient from well MW-12 back to the site:by reducing the mass of.petroleum- <br /> constituents on site. <br /> This report is based in part, on information obtained by Apex from Moore, and is subject to, <br /> modification as newly acquired information m' ay. <br /> BACKGROUND J <br /> Apex began,work on this projecfwith the groundwater monitoring conducted on January. 14,.^ " 1 <br /> 1994. Prior to Apex, work.conducted'at the site included subsurface investigatioris and <br /> 1.groundwater monitoring by Earth Treatment Systems, Iric.,.of Manteca,California;Delta - <br />