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1 <br /> 1.0 INTRODUCTION <br /> ' USA Petroleum Corporation (USA) has retained Park Environmental Corporation (Park) to <br /> represent USA in matters pertaining to environmental issues at Station #110 located at 2132 <br /> Manposa Road, in Stockton, California as shown on Figure 1 of Appendix A Mr Srtkanth <br /> ' Dasappa of USA has authorized Park to prepare this report for assessment of groundwater <br /> quality at the subject site <br /> 1 <br /> San 7oagiun County Public Health Services, Environmental Health Division (PHS/EHD) is the <br /> environmental lead agency for the site The PHSIEHD references this site with Stte�Code <br /> ' #1669 <br /> ' 1.1 Scope of Work <br /> The following is a brief summary of the scope of work authorized by USA <br /> ' • Measure <br /> depth to groundwater in all wells on the site <br /> P <br /> t • Calculate groundwater elevations and determine groundwater flow <br /> direction, <br /> • Pure three well volumes of groundwater from each of the wells <br /> Purge <br /> (MW-1-P, MW-2-P and MW-3-P) and monitor pH, temperature, and <br /> ' conductivity, <br /> ' © Collect and analyze water samples for total petroleum hydrocarbons (TPH) <br /> quantified as gasoline (TPH G) and diesel (TPH D), benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) and for total <br /> lead using EPA methods 8015,8020 and 7421, respectively, and <br /> ® Prepare this Quarterly Groundwater Monitoring Report for <br /> ' USA, and submit to PHSIEHD <br /> 1.2 Facility Description <br /> The USA service station is located on the southeast corner of the intersection of East Mariposa <br /> ' Avenue and Farmington Road in Stockton, California, as shown on Figure 1 The station has <br /> four underground storage tanks (USTs), of which three are 12,000-gallon gasoline tanks and <br /> ' one is a 3,000-gallon diesel fuel tank, as shown on Figure 2 All four tanks appear to be <br /> located in the same tank pit excavation on the Manposa Road side of the property <br /> 5007 B 1 <br /> 4 <br />