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+l `1 BROWN AND C A L D W E L L August 15, 1994 Mr Chuck Carmel ARCO Products Company Post Office Box 5811 San Mateo, California 94402 017-1264-01/1 Subject First Quarter 1994 Report for ARCO Station 2093, 3425 Tracy Boulevard, Tracy, California Pilot Program Site 1416 Dear Mr Carmel This report presents water level measurements and results of groundwater sampling performed during the first quarter of 1994 at ARCO Products Company (ARCO) Station 2093, located at 3425 Tracy Boulevard in Tracy, California Fieldwork was performed by Groundwater Technology, Inc (GTI) on February 17 and 18, 1994 This report was prepared under Task Order 2093-94-7 There are seven on-site groundwater monitoring wells (ATR-1 through ATR-7) and live off-site monitoring wells (ATR-8 through ATR-12), as shown on Figure 1 Six of the on-site wells and four off-site wells were sampled Well ATR-6 was not sampled because it was inaccessible and well ATR-8 was not sampled because it contained floating product Field and Analytical Methods GTI personnel measured depth-to-water and product thickness (if present), purged each well to be sampled, and collected groundwater samples at the site Depth-to-water measurements and a check for floating product were made prior to commencing purging This report was prepared in accordance with the standards of the environmental consulting industry at the time it was prepared It should not be relied upon by parties other than those for whom it was prepared and then only to the extent of the scope of word, which was authorized This report does not guarantee that no additional environmental contamination beyond that described in this report exists at the site 12&4VREPORTSI[ST94QTR RPT Environmental Engineering And Consulting Analytical Services 9616 MICRovAtiENUE P 0 Box 13449 SaCRi',1E%T0 CA 4)613 3449 (916) 444 0 12 3 Far (916) 856 )2 7 7