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P� J} 1 AEGIS ENVIRONMENTAL , INC 1050 Melody Lane, Suite 160, Roseville, CA 95678 + 916.782-2110 1916-969-2110/FAX 916.786-7830 February 2, 1993 { "ff" D 1! FEB 12 1993 Mr Kenneth Earnest ENVIRONMENTAL HEALTH Environmental Specialist PERMIT/SERVICES Ultramar Inc 525 West Third Street Hanford, California 93232-0466 Subject Fourth Quarter 1992 Groundwater Monitoring Report Beacon Station #696 2448 West Kettleman Lane, Lodi, California Dear Mr Earnest Aegis Environmental, Inc (Aegis), is pleased to provide Ultramar Inc , this report documenting the results of quarterly groundwater monitoring, conducted on November 23, 1992, at the subject site (Figure 1) The monitoring included measurements of depth to water in and/or total depths of ten (MW-13, MW-1411, MW-19, MW-20, MW-23, MW-24, MW-25, MW-34, MW-35, and MW-36) wells on and off the site (Figure 2) Groundwater samples were collected from MW-20, MW-34, MW-35, and MW-36 Depth to water was measured in wells MW-19, MW-24, and MW-25, but there was not enough water to sample Wells MW-13, MW-14R, and MW-23 were dry GROUNDWATER ELEVATIONS Aegis personnel collected measurements of the depth to groundwater in the four wells prior to purging and sampling on November 23, 1992 Current groundwater level data, and prior 1992 data only, are summarized in Table 1 Previous groundwater level data are included in Attachment 3 All measurements of depth to groundwater were made to the nearest 0 01 foot from the referenced wellhead (top-of-casing) elevations and conducted according to the Aegis standard operating procedures (SOP) included in Attachment 1 On the basis of the November 23, 1992, measurements, groundwater is estimated to flow generally to the south (Figure 2) at an average gradient of approximately 0 01 ft/ft In general, groundwater levels have decreased compared to the previous quarter 92-734A RPT GEOLOGISTS • ENGINEERS - GROUNDWATER SCIENTISTS