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Fuller 1Mlobile dome Park 365 East Louise, Lathrop, California Quarterly Groundwater Sampling Report April, 1995 .Narrative ' On April 11, 1995, WHY Environmental Consultants, Inc , in conjunction with FKM Groundwater Monitoring, conducted field measurements, well pumping and groundwater sampling on seven (7) g:aunewater monitoring wells located at this site (Figure 2) Groundwater elevations were taken from seven (7) wells prior to pumping (Table 1 & Appendix B) Monitoring wells MVV-1 through MW-7 were evacuated by means of a steam-cleaned, stainless steel bladder-type pump During the three (3) volume pump down of each well samples were collected to measure field pH, electrical conductivity and temperature (Table 3 & Appendix B) Once stability was achieved, a minimum of three (3) well volumes were removed and samples were collected with a steam-cleaned 1 disposable b.uler The samples were then labeled and placed in an ice chest cooled with Blue Ice The samples, bailer blanks and trip blank were then logged on a Chain of Custody (Appendix A) and transported to the State-certified laboratory, California Laboratory Services, in Rancho Cnrdova, California The analysis requested for the water samples was EPA method 602 for BTX&E, EPA method 5030/8015 (GCFID) for gasoline and EPA method 3510/8015 for diesel The analytes and concentrations detected are listed in Table 2 of this report I _ Groundwater Gradient ' The water level measurements from the monitoring wells were used to calculate the gradient and construct a groundwater gradient map (Figure 3) The gradient this quarter ' appears to be variable from 0 0005 to 0 0091, forming a trough trending and plunging southeast Water levels have risen an average of 156 feet across the site since the last measurements (1123195) Mstoncal gradient maps are included in Appendix C 1