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VIMNNMENTIL <br /> ALTH <br /> B R 0 W N A N D _t E#F� Qf r; ff r- <br /> OL <br /> F tr <br /> C A L D W E L L ,AN17pg2: r8 <br /> January 11, 1995 <br /> Mr Kyle Christie <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-1264-0111 <br /> Subject Third Quarter 1994 Report for ARCO Facility 2093, 3425 Tracy Boulevard, <br /> Tracy, California Pilot Program Site 1416 <br /> Dear Mr Christie <br /> This report presents water-Ievel measurements and results of groundwater sampling performed <br /> during the third quarter of 1994 at ARCO Products Company (ARCO) Facility 2093, located', <br /> at 3425 Tracy Boulevard in Tracy, California Fieldwork was performed by Groundwater <br /> Technology, Inc (GTI) on October 7, 1994 This' report was prepared under Task Order <br /> 2093-94-7 <br /> There are eight on-site groundwater monitoring wells (ATR-1 through ATit=7 and newly <br /> installed SMW-1), five oil-site monitoring wells (ATR-8 through ATR-12), and one on-site <br /> groundwater extraction well (TEX-1), as shown on Figure 1 and 2 In addition, seven dual <br /> completion soil vapor extraction/air sparge wells and two air sparge wells were installed <br /> during the week of September 19, 1994 The welt installation is summarized in a forthcoming <br /> report The newly installed wells are shown on figure 1 and 2 Seven of the on-site wells <br /> and three off-site wells were sampled Wells ATR-3 and ATR-8 were not sampled because <br /> of the presence of free product sheen and ATR-U was not sampled because GTI was unable <br /> to open the lid to the well <br /> Field and Analytical Methods <br /> GTI personnel measured depth-to-water and product thickness (when present), purged each <br /> well to be sampled, and collected groundwater samples at the site Depth-to-water <br /> measurements and a check for floating product were made prior to commencing purging <br /> fl <br /> Prior to sampling, the wells were purged of a minimum of three well casing volumes or until <br /> evacuated using a centrifugal pump or bailer Alter purging, each well was sampled using <br /> a disposable bailer All groundwater samples were analyzed for benzene, toluene, <br /> This report was prepared in accordance with the standards of the environmental consulting industry at the time it was <br /> prepared It should not be relied upon bti parties other than those for whom it was prepared, and then only to the <br /> extent of the scope of wort which was authorized This report does not guarantee that no additional environmental <br /> contamination be)ond that described in this report exists at the site <br /> Eng ronrrrenal Engineering A-U Consulting Ana�pcaf Sery ces <br /> 1215AREP0RT5X3RD94QTR RPI' <br /> 4616 %1rCR0 t`LE P 0 Boy 11449 S \cRvE`Ta CA 9 )813 3444 <br /> [916 ] 444 0 12 3 F916 ] 86 )2 7 7 <br />