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BeBrown and Caldwell <br /> Consultants <br /> 723 S Street <br /> Sacramento E C E. t <br /> CaldomLa 95814 7092 <br /> (915)444 0123 <br /> FAX(916)444 8437 M A R 2 2 1993 I q� <br /> ENVIRONNIENTALH AL! H <br /> March 17, 1993 PERMIT/ ERVICU <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-7453-04J1 <br /> Subject: First 1993 Quarterly Report for ARCO Station 2133, <br /> 2908 Benjamin Holt Drive, Stockton, California <br /> Dear Mr. Carmel: <br /> This report presents water level measurements and results of groundwater sampling performed <br /> during the first quarter of 1993 at ARCO Products Company (ARCO) Station 2133 located <br /> at 2908 Benjamin Holt Drive in Stockton, California. The sampling was performed on <br /> January 27, 1993, by Emcon and Associates (Emcon). This report was prepared under Task <br /> Order 2133-93-5. There are fifteen on-site wells: E-2 through E-12,PR-1,PR-2, BHD-1, and <br /> . BHD-2 (Figure 1). All the wells were sampled. <br /> Field and Analytical Methods <br /> Emcon personnel measured depth-to-water, supervised purgmg of each well, and collected <br /> groundwater samples at the site. A copy of Emcon's field notes is included as Exhibit A. <br /> The purge water generated during this sampling event was temporarily stored on site in <br /> 55-gallon barrels then transported off site by Balch Petroleum Company. <br /> All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (MH-G) <br /> and benzene, ethylbenzene, toluene, and xylenes (BETX) by Modified U S. Environmental <br /> Protection Agency Methods 5030/8020/DHS LUFT Method. <br /> Results <br /> Table 1 (Exhibit B) presents the water-level data for this site while Table 2 (Exhibit C) <br /> summarizes historical groundwater flow direction and gradient data for this site. Figure 1 <br /> shows the water-level elevations for each well and the contours of equal water-level elevation <br /> for January 27, 1993. <br /> Analytical results are summarized in Table 3 (Exhibit D). The complete laboratory report for <br /> the January 1993 sampling is presented in Exhibit E. Figure 2 shows BETX and TPH-G <br /> concentrations for each well sampled. In addition,Figure 2 presents an approximation(dashed <br /> `. line) of the lateral extent of benzene in the groundwater. <br /> 7453aEP0RT gST93QTRAn ,�, <br />