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' INTRODUCTION <br /> ' ETIC Engineering,Inc.has prepared this quarterly groundwater monitoring report for ExxonMobil <br /> Environmental Services Company on behalf of ExxonMobil Oil Corporation for former Mobil <br /> Station 99CAS. This report presents the results for the most recent groundwater monitoring <br /> conducted at the site and summarizes recent site activities. This report covers site activities from 5 <br /> and 6 October 2010, the dates of the previous monitoring event,until 9 February 2011,the date of <br /> the most recent monitoring event. Groundwater monitoring results,well construction details,and a <br /> ' groundwater monitoring plan are provided in the attached figures and tables. Groundwater <br /> monitoring protocols, field data, and analytical results are provided in the attached appendixes. <br /> ' GENERAL SITE INFORMATION <br /> ' Site name: Former Mobil Station 99CAS <br /> Site address: 75 East Alpine Avenue, Stockton, California <br /> ' Current property owner: Arthur Lavagnino,Duane and Wendy Berndt of the Guido G. <br /> Segarini Trust <br /> Current site use: Landscaping and paved areas <br /> ' Current phase of project: Groundwater monitoring <br /> Tanks at site: Four underground storage tanks removed in September 1994 <br /> Number of wells: 14 groundwater monitoring wells(11 onsite,3 offsite) 10 soil <br /> t vapor monitoring wells(onsite),4 soil vapor extraction wells <br /> (onsite) <br /> ' GROUNDWATER MONITORING SUMMARY <br /> ' Gauging and sampling date: 9 February 2011 <br /> Wells gauged and sampled: MWl-MW8, DWl-DW4, EXl, EX2 <br /> ' Wells gauged only: None <br /> Groundwater flow direction(shallow zone): East-northeast <br /> Groundwater gradient(shallow zone): 0.004 <br /> ' Groundwater flow direction (deep zone): East-northeast <br /> Groundwater gradient(deep zone): 0.004 <br /> Well screens submerged: DW1-DW4 <br /> ' Well screens not submerged: MWl-MW8, EXI, EX2 <br /> Liquid-phase hydrocarbons: Not observed or detected <br /> Laboratory: Calscience Environmental Laboratories,Inc.,Garden <br /> ' Grove, California <br /> Analyses performed: <br /> ' . Total Petroleum Hydrocarbons as gasoline and diesel by EPA Method 8015B (M) <br /> Benzene,toluene, ethylbenzene, and xylenes by EPA Method 8260B <br /> 1 <br /> ' GTmoj=cLExo�obilVSi[eWCAStPublial QM GW table end othe 9CA5-t .don 1 <br />