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v <br /> "s <br /> ! w 7 <br /> i �6 <br /> lt <br /> C A L D W E L L '° A09 <br /> April 4, 1995 <br /> Mr Kyle Christie <br /> ARCO Products Company <br /> 2155 South Bascom Avenue, Suite 202 <br /> Campbell, California 95008 017-1264-0111 <br /> Subject- Fourth Quarter 1994 Report for ARCO Facility 2093, 3425 Tracy Boulevard, <br /> Tracy, California Pilot Program Site 1416 <br /> i <br /> I <br /> Dear Mr Christie <br /> This report presents water-level measurements and results of groundwater sampling performed <br /> during the fourth 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 December 16, 1994 This report was prepared under Task Order <br /> 2093-94-7 <br /> There are eight on-site groundwater monitoring wells (ATR-1 through ATR-7 and SMW-1), <br /> five off-site monitoring wells (ATR-8 through ATR-12), one on-site groundwater extraction <br /> well (TEX-1). Seven dual completion soil vapor extraction/air sparge wells (VES-1 through <br /> VES-7) and three air sparge wells (S-1 through S-3) as shown on Figure 1 and 2 Wells <br /> ATR-3 and ATR-8 were not sampled because of the presence of free product or free product <br /> sheen and ATR-12 was not sampled because GTI was unable to access 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 free product were made prior to commencing purging. <br /> Prior to sampling, the wells were purged of a minimum of three well casing volumes or until <br /> evacuated using a pump or bailer After purging, each well was sampled using a disposable <br /> bailer All groundwater samples were analyzed for benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPH-G) by U S. <br /> Environmental Protection Agency (EPA) Method 503018020, and 8015 Modified Field data <br /> sheets and chain-of-custody documentation are included in Exhibit A. <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 by parties other than those for whom if was prepared, and then only to the <br /> extent of the scope of work which was authorized This report does not guarantee that no additional environmental <br /> contamination beyond that described in this report exists at the site <br /> Environmental Engioeenng And Consufting Anafvbcai Services <br /> 9616 %11CR0N ANE LE $LITE 600 5ACR,i�fEvT0 CA 95$27 26271264WREPORTS\4TH94QTRKn <br /> (916) 444 0 12 3 Fix {9161856 5277 <br />