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SITE-SPECIFIC HEALTH AND SAFETY PLAN FOR WELL INSTALLATIONS <br />Site Background and Chemical Hazards <br />May 4, 2017 <br />3.0 Site Background and Chemical Hazards <br />The Site is located in a mixed commercial and residential area at the intersection of Country <br />Club Boulevard and Franklin Avenue in Stockton, California. The site address is 2103 Country Club <br />Boulevard. The former service station was in operation from 1962 to 1986 and was razed in late <br />1988. The site is currently an unpaved vacant lot owned by Mr. Mark Springs. <br />The recent monitoring and sampling events show groundwater concentrations above water <br />quality objectives (WQ0s) for total petroleum hydrocarbons as gasoline (TPHg) and benzene in <br />downgradient B zone monitoring well MW-12B and for TPHg in cross-gradient A zone well MW-6. <br />Results from the third quarter 2016 sampling event reported TPHg concentrations of 580 <br />micrograms per liter (pg/L), and 340 pg/L, in wells MW-12B, and MW-6, respectively. The same <br />sampling event reported concentrations of benzene at 160 pg/L, and <0.5 pg/L, in wells MW-12B, <br />and MW-6, respectively. These most recent results are a decrease from other recent events, but <br />historical trends have shown some fluctuations. Due to the historical concentration trends seen in <br />the sentinel groundwater wells, and as noted in the recent CVRWQCB correspondence, <br />additional delineation of dissolved impacts in the A and B zones is warranted. <br />Stantec <br />14