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- <br /> a <br /> Quik Stop Market No. 132 August 28, 1990 <br /> Job No. 349132-31 Page 1 <br /> PHASE 2 <br /> WORK PLAN FOR <br /> GROUNDWATER INVESTIGATION <br /> Fn r <br /> a" <br /> AT ;, <br /> QUIK STOP MAR_1 ET NO. 132 SSP 0 4 Ion <br /> i. 3555 W HAMMER DANENVIROM;,,EittTAL, t=r� <br /> STOCKTON, CALIFORNIA PERtul]I SEt�' If,[S <br /> LA Exceltech, Inc., proposes the drilling and sampling of five exploratory borings and <br /> s converting three of them to groundwater monitoring wells at Quik Stop Market No. <br /> 132 at 3555 W Harnkner Lane, Stockton, California (Figure 1). I€ these wells do not <br /> define the extent of the grc undwater contamination, Exceltech is prepared to proceed <br /> with installing additional wells to define the limits of contamination. In addition, <br /> ExceItech will attempt to collect two samples from the soil beneath the in-place <br /> ills <br /> underground fuel storage tanks, Quik Stop Markets has expressed to Exceltech its <br /> desire to begin work immediately upon issuance of thePe ro r P,.ermits. <br /> P <br /> fa SITE HISTORY <br /> Quik Stop Market No. 132 currently utilizes three underground fuel-storage tanks on- <br /> site; two 10,000-gallon tanks contain regular unleaded and leaded gasoline and one <br /> 8,000-gallon tank contains super unleaded gasoline. In 1987, Exceltech installed a <br /> J vadose monitoring system around the tanks at the site. This system detected <br /> hydrocarbon contamination in July 1990, Gasoline contaminated fill was found in the <br /> r lined trenches containing the product lines. The contaminated backfill has been <br /> _`? r removed from the trenches. Soil samples were collected and analyzed for gasoline <br /> i, components. The results of the analysis revealed that hydrocarbons have penetrated the <br /> s' soil adjacent to the east half of the product line trench which serves the north pump <br /> I, island. <br /> Exceltech drilled four borings and converted one of tr.em to a groundwater monitoring <br /> well on August 23, 1990, The results of soil analysis of the soil samples from three <br /> f � borings showed little or no hydrocarbon contamination. One boring,_near the <br /> northwest portion of the north pump island, contained 460Pe <br /> arts r million (ppm) total <br /> P <br /> petroleum hydrocarbons as gasoline (TPHG). The groundwater from the monitoring <br /> }FtF well on the east side of the north pump island contained 470 parts per billion (ppb) <br /> TPHC and 21 ppb benzene as well as detectable levels of toluene, ethyl benzene, and <br /> a a <br /> totalxylenes. <br /> ti <br /> i � <br /> Ir :: <br />