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r y -.� sti *�, ; p i�i n.r T -•1 MAY 2 2 1992 ENVIRONMENTAL HEALTH PERMIT/SERVICES Sute 100 Drive �� Delta Rancho Cordova CA 95670 Environmen#al 9161638 2085 Consultants,Inc FAX 916/638 8385 May 12, 1992 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 Subject Quarterly Monitoring Letter Report, First Quarter 1992 Beacon Station No 696 2448 West Kettleman Lane, Lodi, California Delta Project No 40-90-839 Dear Mr Earnest Delta Environmental Consultants, Inc (Delta), has been authorized by Ultramar Inc (Ultramar) to conduct quarterly ground water monitoring at Beacon Station No. 696 located at 2448 West Kettleman Lane, Lodi, California The location of the site is shown in Figure 1 This letter report contains results of the most recent quarterly ground water monitoring performed at the site Ground water levels were measured and ground water samples were collected for analysis on March 4, 1992 Work conducted at the site by Delta was performed in accordance with the field methods and procedures described in Enclosure A A total of 23 monitoring wells are present at and adjacent to the site as shown in Figure 2 Monitoring wells MW-20, MW-24, MW-25, MW-34, MW-35, and MW-36 contained measurable ground water on March 4, 1992 Ground water was not present in other monitoring wells at the site. The depth to ground water was approximately 49 to 50 feet below the top of the well casings Ground water levels in the monitoring wells have increased approximately 1.5 feet since the previous monitoring event in December 1991 A summary of the ground water levels recorded at the site since February 1991 are included in Table 1 The ground water level data recorded on March 4, 1992, indicate that ground water is not flowing in a uniform direction across the site (Figure 3) The chaotic pattern of groundwater flow inferred by the ground water level data is probably due to the operation of a soil vapor recovery system at the site The system has been in operation since August 1991 and applies a vacuum to vadose wells MW-2, MW-5, MW-7, MW-10, MW-19, and MW-28, and monitoring wells MW-20, MW-24, MW-34 and MW-35 Previous ground water level data recorded in February, April, and June 1991 indicated the ground water flow direction at the site was toward the south It is anticipated that the actual ground water flow direction at the site is toward the south as determined by previous monitoring events Ground water samples collected from monitoring wells MW-20, MW-24, MW-25, MW-34, MW-35, and MW-36 on March 4, 1992, were submitted to a California-certified laboratory for analysis of benzene, toluene, ethylbenzene, and xylenes (BTEX), and total petroleum hydrocarbons (TPH) as gasoline A summary of these analytical results, and the analytical results from previous sampling events since February 1991, are presented in Table 2 Copies of the field sampling information Delta Delvers Solutions