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f <br /> I <br /> I <br /> ADDITIONAL ASSESSMENT WORKPLAN <br /> JAY'S MINI-MART, STOCKTON <br /> APRIL 2002 <br /> On August 11, 2000 John P. Cummings &Associates(JPCA)attempted to drill a soil boring with <br /> a push rig,but encountered refusal at 25-feet bgs. On September 7}2000 JPCA completed tl a soil <br /> boring to 53-feet bgs using a rotary auger drill rig. MTBE and tertiary Butanol were detected in soil <br /> at concentrations of up to 210 mg/kg and 1,800 mg/kg, respectively, at depths of between 3�0 and <br /> 40 feet bgs. TPH G,toluene, and MTBE were reported in groundwater at 800 µg/l, 18µg/1, and 10 <br /> respectively. <br /> µg/1,res .p y <br /> On December 23, 1999 the County directed that an additional site investigation be conducted to <br /> assess the impact of petroleum constituents,including MTBE, in groundwater at the site. <br /> GBH assumed environmental consulting responsibilities for the site in March 2002. <br /> .i <br /> Objective <br /> The objective of this workplan is to present a scope of work that will evaluate the extent of impacted <br /> soil and groundwater in the area surrounding soil boring B-1. Soil boring locations were directed <br /> by the county and are shown in Figure 3. This workplan proposes to drill three soil borings to <br /> { approximately 50 to 55-feet bgs to define subsurface conditions. Soil and groundwater samples will <br /> be collected and analyzed for TPH G, TPH D, BTEX, 1,2-dic�loroethane (1,2-DCA), ethylene <br /> dibromide(EDB),and fuel oxygenates. <br /> M <br /> f <br /> SCOPE OF WORK { <br /> The following specific tasks will be completed to meet the objectives stated above: <br /> Preparation of a site specific health and safety plan(HSP). <br /> Obtain necessary boring and well permits from the County. <br /> I <br /> Obtain Underground Service Alert(USA)clearance. ; <br /> • Drill, sample and abandon three soil borings. <br /> • Sample selected soil samples for TPH G, TPH D, BTEX, 1,2-DCA, EDB, and fuel <br /> i <br /> oxygenates. <br /> �ii I, <br /> • Analyze groundwater samples for TPH G, TPH D,BTEX, 1,2-DCA,EDB, and4fuel <br /> oxygenates. <br /> 2 <br /> i <br /> i <br />