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' Fuller Mobile Home Park <br /> 365 East Louise, Lathrop, California <br /> Quarterly Groundwater Sampling Report <br /> April, 1998 <br /> Narrative <br /> iOn April 8, 1998, WHF Inc , in conjunction with HKM Environmental, Inc , conducted <br /> field measurements, well pumping and groundwater sampling on seven (7) groundwater <br /> monitoring wells located at this site (Figure 2) Sampling was conducted on a later date <br /> due to scheduling complications with HKM Environmental, Inc <br /> Groundwater elevations were taken from seven (7) wells prior to pumping (Table 1 & <br /> Appendix B) Monitoring wells MW-1 through MW-7 were evacuated by means of a <br /> steam-cleaned, stainless steel bladder-type pump During the three (3) volume pump <br /> down of each well, samples were collected to measure field pH, electrical conductivity and <br /> temperature (Table 3 & Appendix B) Once stability was achieved, a minimum of three <br /> (3) well volumes were removed and samples were collected with a steam-cleaned <br /> disposable bailer The samples were then labeled and placed in an ice chest cooled with <br /> Blue Ice® <br /> The samples, bailer blanks and trip blank were then logged on a Chain of Custody <br /> (Appendix A) and transported to the State-certified laboratory, California Laboratory <br /> Services, in Rancho Cordova, California The analysis requested for the water samples <br /> was EPA method 602 for BTX&E (Benzene, Toluene, Xylenes & Ethylbenzene), 8260 <br /> for Oxygenates and EPA method 5030/8015 (GCFID) for Gasoline and EPA method <br /> 3510/8015 for Diesel and Motor Oil The analytes and concentrations detected are listed <br /> in Table 2 of this report <br /> Groundwater Gradient <br /> The water level measurements from the monitoring wells were used to calculate the <br /> gradient and construct a groundwater gradient map (Figure 3) The gradient this quarter <br /> is 0 0160 ft/ft at S63°W Historical gradient maps are included in Appendix C <br /> I <br />