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1 <br /> AEGIS ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 ♦ 916.782-2110 1916-969-21101 FAX 916.786-7830 <br /> April 1, 1993 i <br /> APR 12 1993 <br /> ENVIRONMENTAL HEALTH <br /> PERMIUSERVICES <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 #502 <br /> 35 North Cherokee Lane, Lodi, California <br /> Dear Mr. Earnest: <br /> Aegis Environmental, Inc. (Aegis), is pleased to provide Ultramar Inc., this report <br /> documenting the results of quarterly groundwater monitoring conducted on <br /> February 5, 1993, at the subject site (Figure 1). The monitoring included depth-to-water <br /> and/or total depth measurements for all five wells (MW-1 through MW-5) located on site <br /> (Figure 2). Groundwater samples were collected from four of the wells. Well MW-1 was <br /> dry. <br /> GROUNDWATER ELEVATIONS <br /> Aegis personnel collected measurements of the depths to groundwater in the five wells <br /> prior to purging and sampling four of the wells on February 5, 1993. Current groundwater <br /> level data, and prior 1992 data only, are summarized in Table 1. Previous groundwater <br /> level data are included in Attachment 3. Measurements of depths to groundwater were <br /> made to the nearest 0.01 foot from the referenced wellhead (top-of-casing) elevation and <br /> conducted according to the Aegis standard operating procedures (SOP) included in <br /> Attachment 1. On the basis of the February 5, 1993, measurements, groundwater is <br /> estimated to flow generally to the southeast (Figure 2) at an average gradient of <br /> approximately 0.01 ft/ft. In general, groundwater levels have increased compared to the <br />*Wt( October 1992 event. <br /> 92-7916.RFr <br /> GEOLOGISTS - ENGINEERS • GROUNDWATER SCIENTISTS <br />