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p orn <br /> r <br /> APR 2 2 1993 <br /> LNVIRQNMENTAL HEALTH <br /> AEGIS ENVIRONMENTAL , INkRMI7/SERVICES <br /> 1050 Melody Lane,Suite 160, Roseville, CA 95678 ♦ 916.782-2110/916.969-2110 FAX 916.786-7830 <br /> April 9, 1993 <br /> Mr. Kenneth Earnest <br /> Environmental Specialist <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93232-0466 <br /> Subject: First Quarter 1993 Groundwater Monitoring Report <br /> Beacon Station #494 <br /> i.. 2185 Fremont Street, Stockton, California <br /> Dear Mr. Earnest: <br /> egis Environmental, Inc. (Aegis), is pleased to provide Ultramar Inc. this report <br /> the results of quarterly groundwater monitoring conducted on <br /> h-ocumenting <br /> bruary 4, 1993, at the subject site (Figure 1). The mor toring included measurements <br /> of depths to groundwater in and total depths of the five wells (MW-1 through MW-5) on <br /> the site (Figure 2). Groundwater samples were collected from all five wells. <br /> GROUNDWATER ELEVATIONS <br /> Aegis personnel collected measurements of the depths to groundwater in the five wells <br /> prior to purging and sampling on February 4, 1993. Current groundwater level data, and <br /> prior 1992 data only, are summarized in Table 1. Previous groundwater level data are <br /> included in Attachment 3. All measurements of depths to groundwater were made to the <br /> nearest 0.01 foot from the referenced wellhead (top-of-casing) elevations and conducted <br /> according to the Aegis standard operating procedures (SOP) included in Attachment 1. <br /> On the basis of the February 4, 1993, measurements, groundwater is estimated to flow <br /> to the northwest (Figure 2) at an average gradient of approximately 0.02 ft/ft. In general, <br /> groundwater levels have increased compared to the October 1992 event. <br /> 92-7906.RPT <br /> GEOLOGISTS - ENGINEERS • GROUNDWATER SCIENTISTS <br />