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l� AEGIS ENVIRONMENTAL , INC 1050 Melody Lane, Suite 160, Roseville,CA 95678 ♦ 916. 782-2110 1 916.969-2110 1 FAX 916.786-7830 April 8, 1993 � � -,-3 � �0 APR 19 1993 Mr Kenneth Earnest FINVIIRE IVI SERV JI TH Environmental Specialist ICES Ultramar Inc 525 West Third Street Hanford, California 93232-0466 Subject First Quarter 1993 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 February 5, 1993, at the subject site (Figure 1) The monitoring included measurements of depths to groundwater in and/or total depths of ten (MW-13, MW-14R, MW-19, MW-20, MW-23R, MW-24, MW-25, MW-34, MW-35, and MW-36) of the "active" wells on and off the site (Figure 2) Groundwater samples were collected from MW-20, MW-34, MW-35, and MW-36 Groundwater was measured in well MW-25, but there was not enough to sample Wells MW-13, MW-14R, MW-19, MW-23R, and MW-24 were dry GROUNDWATER ELEVATIONS Aegis personnel collected measurements of the depths to groundwater in the four wells prior to purging and sampling on February 5, 1993 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 depths 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 February 5, 1993, measurements, groundwater is estimated to flow generally to the southeast (Figure 2) at an average gradient of approximately 0 01 ft/ft In general, groundwater levels have increased compared to the November 1992 event 92 1348 RPT GEOLOGISTS • ENGINEERS GROUNDWATER SCIENTISTS