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4 <br /> w. <br /> ;- DeB ' -.Tuck Lines, Inc. <br /> 201 West Sth gftg Ripon, California <br /> 7 <br /> Quarterly Groundwater=S�»3�pling Report <br /> June, 1996 <br /> f <br /> Narrative <br /> 7 <br /> 4-1 On July 31, 1996, WHF, Inc., in conjunction with IMM Environmental, Inc., conducted <br /> field measurements, well pumping and groundwater sampling on three (3) groundwater <br /> monitoring wells located at this site (Figures 1 & 2).. Sampling was conducted on a later <br /> date due to scheduling complications with HKM Envitonmental, Inc. <br /> Groundwater elevations were taken from three (3) wells prior to pumping (Table 1 & <br /> Appendix B). Monitoring wells MW-1, MW-2 and -3 were evacuated by 01dans of it `< <br /> steam-cleaned, stainless steel bladder type pump.-.,, During the three (3) vlue. pup;' <br /> down of each well, samples were collected to measus'd field pH, electrical"wrid .uttivity ander, <br /> temperature (Table 3 .& Appendix B). Once stabilitYl was achieved, .a minimum Vbf 111 �- <br /> (3) well volumes were removed and samples wire collected with!- a',, st cleaned-E'• <br /> disposable bailer. The samples were then labeled aAd placed in ani'd zhest;with,Blu&']," _ <br /> Iceg. <br /> The samples, bailer blanks and trip blank were there logged °on a " k !''°b '= C ted ' <br /> (Appendix A) and transported to a State-certified `laboratory, California Laboratory <br /> Services, Inc., in Rancho Cordova, California. The analysis requested for the water <br /> samples vvas EPA method 602 for BTX&E and EPA method 8015/3510 for Diesel. The <br /> analytes-and coancenUadons detected are li asin°' 'Alr = :ofthss,r x <br /> r <br /> Groundwater Gradient <br /> i,. The water level measurements from the monitodririg wells were,used_: to construct,,;.a <br /> groundwater gradient map and calculate the gradient'(Figure 3). The'current'gradient is <br /> y . <br /> 0.0016 ft/ft at N76M. Historical gradient maps are included in Appendix C. <br /> r <br />