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rf AP s v AEGIS ENV IR0NMENTA. L , INC 1050 Melody Lane, Suite 160, Roseville, CA 95678 + 916. 782-2110 1916-969-2110 I FAX 916.786-7830 March 22, 1993 Mr Kenneth Earnest Environmental Specialist ,r Ultramar Inc 525 West Third Street Hanford, California 93232-0466 Subject First Quarter 1993 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 February 5, 1993, at the subject site (Figure 1) The monitoring included measurements of depth to liquids in and/or total depths of twenty-two wells on and off the site (Figure 2) Groundwater samples were collected from nine of the wells (MW-10, MW-16, MW-17, MW-18, MW-21, MW-22, MW-24, MW-27, and RW-1) Well MW-1 has an obstruction in the well and a disposable bailer would not fit down the well All other wells were either dry or did not contain enough water to sample GROUNDWATER ELEVATIONS Aegis personnel collected measurements of the depth to liquids in all wells prior to purging and sampling the nine wells 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 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 February 5, 1993, measurements, groundwater is estimated to flow generally to the southeast (Figure 2) at an average gradient of approximately 0 05 ft/ft In general, groundwater levels have increased compared to the / October 1992 event 92 733B RPT GEOLOGISTS • ENGINEERS • GROUNDWATER SCIENTISTS