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AEGIS ENVIRONMENTAL. , INC 1050 Melody Lane,Suite 160, Roseville, CA 95678 4 916.782-2110 1 916-969-2110 FAX 916.786-7830 f--1 �r t nr March 4, 1993 ENVIRCNMFNTA I HEALTH Mr Kenneth Earnest PERMIT/SERVICES Environmental Specialist Ultramar Inc 525 West Third Street Hanford, California 93232-0466 Subject Revised Fourth Quarter 1992 Groundwater Monitoring Report Beacon Station #695 900 South Cherokee 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 October 29, 1992, at the subject site (Figure 1) The monitoring included measurements of depth to water in and total depths of twenty-two wells on and off the site (Figure 2) Groundwater samples were collected only from three of the wells (RW-1, MW-24, and MW-27) All other wells were either dry or did not contain enough water to sample GROUNDWATER ELEVATIONS Aegis personnel collected measurements of the depth to groundwater in wells RW-1, MW-24, and MW-27 prior to purging and sampling on October 29, 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 October 29, 1992, measurements, groundwater is estimated to flow generally to the south (Figure 2) at an average gradient of approximately 0 013 ft/ft In general, groundwater levels have remained the same compared to the third quarter 92-733A RPT GEOLOGISTS ENGINEERS • GROUNDWATER SCIENTISTS