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1 � <br /> Canepa s Car Wash <br />' 6230 Pac fc Avenue, Stockton, California <br /> Quarterly Groundwater Sampling Report <br />' June, 1995 <br /> I <br /> Narrative <br />' On June 12, 1995, WHF Environmental Consultants, Inc , in conjunction with HKM <br /> Groundwater Monitoring, conducted field measurements, well pumping and groundwater <br /> sampling on eight (8) groundwater monitoring wells located at this site (Figures 1 &: 2) <br /> Groundwater elevations were taken from eight (8) wells prior to pumping (Table 1 & Appendix <br /> B) Monitoring wells MW-1 through MW-8 were evacuated by means of a steam-cleaned, <br /> stainless steel bladder type pump During the three (3) volume pump down of each well, samples <br /> were collected to measure field pH, electrical conductivity and temperature (Table 3 & Appendix <br /> B) Once stability was achieved, a minimum of three (3) well volumes were removed and samples <br /> were collected with a steam-cleaned disposable bailer The samples were then labeled and placed <br /> in an ice chest cooled with Blue Ice® <br /> The samples, bailer blanks and trip blank were then logged on a Chain of Custody (Appendix A) <br /> and transported to the State-certified laboratory, California Laboratory Services, in Rancho <br /> Cordova, California The analysis requested for the water samples was EPA method 602 for <br /> BTX&E and EPA method GCFID (5030/8015) for gasoline The analytes and concentrations <br /> detected are listed in Table 2 of this report <br /> IGroundwater Gradient <br />' The water level measurements from the monitoring wells were used to construct a groundwater <br /> gradient map and calculate the gradient (Figure 3) Water levels rose by an average of 148 feet <br /> across the site Historical gradient maps are included in Appendix C <br /> Summary of Analytical Findings <br /> All eight (8) groundwater monitoring wells had varying amounts of contamination as BTEX and <br /> Gasoline Detectable contaminants for MW-3 have dropped since last quarter (4 0 µg/l Benzene, <br /> 0 44 r /l. Toluene, and 0 77 gaA Xylene) and E-Benzene and Gasoline tested "ND" none <br /> detected Wells MW-1, 2, 4, 6, 7, and 8, had overall increased levels of contamination (MW-1, <br />