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Quik Stop Market No. 132 August 28, 1990 <br /> Job No. 349132-31 page I <br /> PHASE 2 <br /> WORK PLAN FOR <br /> GROUNDWATER INVESTIC".'.TION <br /> AT <br /> QUIK STOP MARKET NO. 132 <br /> 3555 W HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> I <br /> Exceltech, Inc., proposes the drilling and sampling of five exploratory borings and <br /> converting three of them to groundwater monitoring wells at Quik Stop Market No. <br /> 132 at 3555 W Hammer Lane, Stockton, California (Figure 1). If these wells do not <br /> define the extent of the groundwater contamination, Exceltech is prepared to proceed <br /> with installing additional wells to define the limits of contamination, In addition, <br /> Exceltech will attempt to collect two samples from the soil beneath the in-place <br /> underground fuel storage tanks. Quik Stop Markets has expressed to Excettech its <br /> desire to begin work immediately upon issuance of the proper permits, <br /> 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 suer unleaded gasoline. In 1987, Exceltech installed a <br /> 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 /> lined trenches containing the product lines. The contaminated backfill has been <br /> removed from the trenches. Soil samples were collected and analyzed for gasoline <br /> components. The results of the analysis revealed that hydrocarbons ltaYa penetrated the <br /> �s soil adjacent to the: east half of the product line trench which serves the Borth pump <br /> island. <br /> Exceltech drilled four borings and converted one of them to a groundwater monitoring <br /> well on August 23, 1990. The results of soil analysis of the soil samples from three <br /> borings showed little or no hydrocarbon contamination. One boring, near the <br /> northwest portion of the, north Pump island,•.ontained 460 parts per million (ppm) total <br /> petroleum hydrocarbons as gasoline (TPHO). The groundwater from the monitoring <br /> well on the east side of the north pump island contained 470 parts per billion (ppb) <br /> TPHG and 21 ppb benzene as well as detectable levels of toluene, ethyl benzene, and <br /> _total xylenes,._.._ <br /> ' 25/HD31_13DX3 Si:80 06, 62 `)nv <br /> yi _ <br />