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i"y, a* �--` .. ,� '.`� t.... ,.�,£+, ..'� :,i" 4 "tr''' r«? �r '�'� ..F � , ;c.�. "t• �. <br /> t.. '� .,.v <br /> ....t..a'�l".4� r}`"•yr� �+?4i - .rm .u5^- z�`+ r ; w:-.,`* q .rr.c wYdrw.d Sr`w'�d:w :;17 <br /> i <br /> r� <br /> Brown and Caldwell <br /> BG <br /> 'A2 <br /> F T424 <br /> SUN Tn # <br /> May 29, 1991 f+I , <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-5690-3411 <br /> Subject: 1991 First Quarterly Report for,ARCO Station 2133,2908 Benjarn'in Holt Drive, <br /> Stockton, California <br /> Dear Mr. Christie: <br /> This report presents the first quarterly water levels and analytical results of groundwater'sampling <br /> performed at ARCO Products Company (ARCO) Station 2133, located at 2908 Benjamin Hot_t <br /> Drive in Stockton,California. The work was performed on February 11, 1991 through February <br /> 14, 1991,under Task Order 2133-91-5A. There are fifteen on-site wells: k-2 through E-12 and <br /> PR-1, PR-2. B1ID-1, and BHD-2 (Figure 1). Twelve wells were sampled during this sampling <br /> event. Two of the wells,E-3 and E-6,were dry and were not sampled. Access to well E-2 was <br /> obstructed by a vehicle and could not be sampled. This report describes the results of monthly <br /> monitoring of groundwater elevations,which occurred on February 11, 1991, <br /> Field and Analytical Methods <br /> B.own and Caldwell personnel measured depth-to-water levels,supervised purging of each well, <br /> and collected groundwater samples at the site.. Refer to Exhibit A for detailed field methods <br /> description. <br /> All groundwater samples were analyzed for total petroleum hydrocarbons (TPH) and benzenz, <br /> ethylbenzerP,�.oluene,and xylenes(BEfX)by Modified U.S.Environmental Protection Agency << <br /> Method 8015/5030. <br /> Results <br /> The groundwater flow direclion is to the north-northwest. The hydraulic gradient is <br /> approximately 0.003. Comparison of the water levels measured on February 11, I991,with those <br /> measured in September 1990 indicate no significant change in the general groundwater flow <br /> direction or hydraulic gradient. Figure 1 shows the water-level elevations and flow direction <br /> calculated from rte February 11, 1991 data. <br /> j� <br /> Jim BENI= <br /> �111-m No no 111MENEM, Min <br /> r <br />