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' San Joaquin County-Public Works <br /> Second Half 2015(Semi-Annual)Groundwater Monitoring Report <br /> ' Site Background <br /> Page 5 of 5 <br /> Detected concentrations of gasoline compounds in groundwater samples collected on May 15, 2015 were <br /> ' generally similar to results from the past three years in MW-1, MW-2, and MW-4. The concentration of <br /> MTBE in down-gradient well MW-4 decreased from 12 to 11 µg/1, the lowest result since December <br /> 2005. Analytical results indicate that concentrations of hydrocarbons at MW-1 are generally stable and <br /> ' generally increasing at MW-2. The results of the May 15, 2014 groundwater monitoring event were <br /> documented in the First Quarter 2015 (Biennial) Groundwater Monitoring Report-May 2015, dated June <br /> 8, 2015. <br /> X:\Project\5000yq\5960 SJC UST RFQ\5960C County of San Joaquin - SJC Public Works\596005\5\ 96005A <br /> Monitoring\Reports\2H2O15\20151229_596005A Site Background 2H I5.docx <br />