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i Canepa Is Car Wash 248 E Park Street, Stockton, California aka: 642 N. Hunter Street Quarterly Groundwater Sampling Repor'tALi�� 9 X9 �' May, 1995 ' Narrative i ' On May 4, 1995, WHF Environmental Consultants, Inc , in conjunction with HKM Groundwater Monitoring, conducted field measurements, well pumping and groundwater ' sampling on seven (7) groundwater 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 MW-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 I disposable bailer 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 Cordova, California The analysis requested for the water samples ' was EPA method 602 for BTX&E and EPA method GCFID (5030/8015) for gasoline The analytes and concentrations detected are listed in Table 2 of this report ' Groundwater Gradient ' The water level measurements from the monitoring wells were used to construct a groundwater gradient map and to calculate the gradient (Figure 3) The gradient has increased slightly since 2/14/95, and is variable from 0 011 to 0 050 ft/ft The water table ' has increased an average of 2 81 feet since 2/14/94 Histoncal gradient maps are included as Appendix C