COMPLIANCE INFO_1990-2001 - Laserfiche WebLink

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r 0 Quik StopMarket No. 13 20 August 14, 1990 Job No. 349132-31 Page 1 Exceltech, Inc., proposes the drilling and sampling of two exploratory borings and one groundwater monitoring well at Quik Stop Market No. 132 at 3555 W Hammer Lane, Stockton, California (Figure 1). Quik Stop Markets has expressed to Exceltech its desire to begin work immediately upon issuance of the proper permits. Quik Stop Market No. 132 currently utilizes three underground fuel -storage tanks on- site; two 10,000 -gallon tanks contain regular unleaded and leaded gasoline and one 8,000 -gallon tank contains super unleaded gasoline. In 1987, Exceltech installed a vadose monitoring system around the tanks at the site. This system detected hydrocarbon contamination in July 1990. Gasoline contaminated fill was found in the lined trenches containing the product lines. The contaminated backfill has been removed from the trenches. Soil samples were collected and analyzed for gasoline components. The results of the analysis revealed that hydrocarbons have penetrated the soil adjacent to the east half of the product line trench which serves the north pump island. Exceltech proposes to drill and sample two exploratory soil borings, one on the north and one on the south side of the affected product line trench (Figure 2). Each boring will progress the shallower of the following options: (a) first encountered groundwater; (b) 20 feet below the lowermost sample which is nondetected by the portable organic vapor meter (if the soil is predominantly impermeable); or (c) 40 feet below the lowermost sample which is nondetected by the portable organic vapor meter (if the soil is predominantly permeable). In addition to the borings, Exceltech will also install one groundwater monitoring well in a third boring which will be located to the east of the product line trench. This well will be constructed so that the screened interval extends above the groundwater table. This proposed exploration program will provide information which will help Exceltech assess the conditions of the soil and groundwater beneath the site.