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1 <br /> i 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 its Station #110 located at 2132 <br /> Mariposa Road, in Stockton, California (Figure 1 of Appendix A) Mr Srikanth Dasappa of <br /> ' USA has authorized Park to prepare this report for assessment of groundwater quality at the <br /> subject site <br /> ' San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) is the <br /> environmental lead agency for the site The PHS/EHD references this site with Site;Code <br /> #1669 <br /> 1 <br /> 1.1 Scope of Services <br /> ' + Locate and measure depth to groundwater in all three wells on <br /> the site, <br /> 1 • Calculate groundwater elevation and determine groundwater flow <br /> direction, <br /> ' • Purge three well volumes of groundwater from each of the wells <br /> (MW-1-P, MW-2-P and MW-3-P) and monitor pH, temperature, <br /> and conductivity, <br /> • Collect a total of three groundwater samples from each of the <br /> ' wells, and one duplicate sample from MW-3-P, <br /> ' • Analyze water samples for total petroleum hydrocarbons (TPH) <br /> quantified against gasoline and diesel standards, 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 /> ' presentation to USA and the PHSIEHD <br /> 1.2 Facility Description <br /> The USA Petroleum service station is located on the southeast comer of the intersection of <br /> East Mariposa Avenue and Farmington Road in Stockton, California (Figure 1 of Appendix <br /> ' A) The station has four underground storage tanks (USTs), of which three are 12,000 gallon <br /> gasoline tanks and one is a 3,000 gallon diesel fuel tank (Figure 2 of Appendix A) All four <br /> tanks appear to be located in the same tank pit excavation near the Mariposa Avenue frontage <br /> of the property <br /> ' 5007 J3 1 <br />