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Canepa Is Car Wash 6230 Pacific Avenue, Stockton, California Quarterly Groundwater Sampling Report March, 1995 Narrative On March, 16, 1995, WHF Environmental Consultants, Inc , in conjunction with HKM Groundwater Monitoring, conducted field measurements, well pumping and groundwater sampling on eight (8) groundwater monitoring wells located at this site (Figures I & 2) Groundwater elevations were taken from eight (8) wells prior to pumping (Table 1 & Appendix B) Momtonng wells MW-1 through MW-8 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-clemed disposable batter The samples were then labeled and placed in an ice chest cooled with blue ice The samples, bailer blanks and tnp blank were then logged on a Chain of Custody (Appendix A) and transported to the State-certified laboratory, California Laboratory Services, in Rancho Cordova, California The analysis requested for the water samples was EPA method 602 for BTX&E and EPA method GCFID (503018015) for gasoline The analytes and concentrations detected are fisted in Table 2 of flus report Groundwater Gradient The water level measurements from the monitoring wells were used to construct a groundwater gradient map and calculate the gradient (Figure 3) Water levels rose since last quarter averaging 2 06 feet across the site The mound in the water table is evident again this quarter with vanable gradients and directions A total fecal coliform bacteria test was incorporated into this sampling event to help aide in determining the source water of the mound (Table 4) Historical gradient maps are included in Appendix C