ARCHIVED REPORTS XR0001856 - Laserfiche WebLink

Home Browse Search

�l 1 1 3330 Data Dnve Delta Suite 144 Rancho Cordova CA 95670 Environmental 91638 2085 Consultants,Inc FAX 916/638 8385 July 29, 1992 C �n 't 1 .t `- ��a AUG 0 9592 Mr Kenneth Earnest ENVIRONMENM HF-WH Ultramar Inc PERMIT/SERVIC S 525 West Third Street Hanford, California 93230 Subject Quarterly Monitoring Report, Second Quarter 1992 Beacon Station No 695 900 South Cherokee Lane, Lodi, California Delta Project No 40-91-831 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 695 located at 900 South Cherokee Lane, San Joaquin County, Lodi, California (Figures 1 and 2) This letter report contains the results of the quarterly ground water monitoring performed at the site on June 17, 1992 Field work conducted at the site by Delta was performed in accordance with the field methods and procedures described in Enclosure A Ground Water Levels, Flow Direction, and Hydraulic Gradient A total of 23 ground water monitoring wells are present at the site Monitoring wells MW-1, MW-16, MW-17, MW-18, MW-20, MW-21, MW-22, MW-24, MW-25, MW-27 and recovery well RW-1, contained measurable ground water on June 17, 1992 Ground water was not present in the other wells at the site The depth to ground water ranged from approximately 65 to 69 feet below the top of the well casings Ground water table levels in the monitoring wells have decreased approximately I foot since the previous monitoring event in March 1992 A summary of ground water levels recorded at the site since June 1991 is mLluded in Table 1 Enclosure B contains ground water level data since January 1988 The ground water level data recorded on June 17, 1992, were used to construct the water table contour map included as Figure 3 The water table contours indicate the inferred direction of ground water flow across the site was toward the southwest with an average hydraulic gradient of 0 02 A ground water mound in the vicinity of monitoring well MW-1 is probably due to the soil vapor extraction system at the site which was in operation during the measurement of ground water levels The system applies a vacuum to monitoring wells MW-1, MW-2, MW-5, MW-7, MW-8, MW-9, MW-10, MW-16, MW-17, MW-22, and MW-27 Previous ground water level data have indicated that the ground water flow direction at the site is toward the south or southwest The depth to water in monitoring well MW-22 (57 68 feet) on June 17, 1992, is not considered to be representative of ground water conditions at the site, therefore, this datum was not included in Figure 3 The total depth of monitoring well MW-22 is approximately 59 teet below grade and ground water was not present in any other wells at less than approximately 65 tees below grade The water present in monitoring well MW-22 was probably condensate trom moisture drawn into the well by the soil vapor extraction system Delta Delvers Solutions