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!r <br /> AEGIS ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 + 916.782-2110 1916-969-2110 J FAX 916.786-7830 <br /> February 2, 1993 <br /> Mr. Kenneth Earnest <br /> Environmental Specialist <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93232-0466 <br /> Subject: Fourth Quarter 1992 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 /> October 29, 1992, at the subject site (Figure 1). The monitoring included well depth <br /> measurements for all five wells (MW-1 through MW-5) located on site (Figure 2). <br /> Groundwater samples were collected from MW-3 only. Depth to water was measured in <br /> MW-5, but there was not enough water to sample. All other wells were dry. <br /> GROUNDWATER ELEVATIONS <br /> Aegis personnel collected a measurement of the depth to groundwater in well MW-3 prior <br /> to purging and sampling on October 29, 1992. Current groundwater level data, and prior <br /> 1992 data only, are summarized in Table 1. Previous groundwater level data are included <br /> in Attachment 3. The measurement of depth to groundwater was made to the nearest <br /> 0.01 foot from the referenced wellhead (top-of-casing) elevation and conducted according <br /> to the Aegis standard operating procedures (SOP) included in Attachment 1. In general, <br /> groundwater levels have decreased compared to the previous quarter. <br /> 92-M A.RFT <br /> GEOLOGISTS • ENGINEERS • GROUNDWATER SCIENTISTS <br />