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RI, go RINArZ w _ 5 NO wmlw� ...;� -WE--, y k a FM Fi:fluun and Caldwell b' JUN 3 May 29, 1991 EN'V;,",:'WgNIENT'n'L F;'EALTi-i rL RY,i1 /S4f�a4.-J Mr. Chuck Carmel ARCO Products Company Post Office Box 5811 017-5590-34i1 San Mateo, Califomia 94402 Subject: 1991 First Quarterly Report for ARCO Station 2133,2908 Benjamin Holt Drive, Stockton, California Dear Mr. Christie: This report presents the first quarterly water levels and analytical 2133,lesulted ats of g groundwater water sam Hog performed at ARCO Products Company (ARCO) Station Drive in Stockton,California. The work was performed on February 11, 1991 through February ugh E-12 and 14, 1991,under Task Order 2133-91-5A. There are fifteen on-site welly durin oth s sampling PR-1, PR-2, BHD-=, and BHD-2(Figure 1). Twelve wells were same g E-3 and E-6 were dry and Fere not sampled. Access to well E-2 was event. Two of the wells, led, This re ort describes the results of monthly obstructed by a vehicle and could not be sampled. P monitoring of groundwater elevations, which occurr4d on February 11, 1991. Field and Analytical Methods Brown and Caldwell personnel measured depth-to-water levels,supervised purging of each well, at the site. Refer to Exhibit A for detailed field methods and collected groundwater samples description. All groundwater samples were analyzed for total petroleum hydrocarbons (TPH) and benzene, All groundwater toluene,and xylenes(BETX)by Modified U.S.Environmental Protection Agency Method 801515030. Results The groundwater flow direction is to th=le els measured on February hydraulic-northwest, The 1991,%itth those approximately 0.003. Comparison of the Ovate significant change in the general groundwater flaw measured in September 1990 in no sig direction or hydraulic gradient. Figure 1 shows the water-level elevations and flaw direction calculated from the February 11, 1991 data.