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11 August 2008 AGE -NC Project No. 07-1569 Page 2 of 5 were typically deposited in lacustrine, fluvial, and alluvial environments, with sources being the mountain ranges surrounding the valley. The site is located on unconsolidated and semi -consolidated alluvium, lake, playa, and terrace deposits of Quaternary age. The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500 -square mile San Joaquin Valley Ground Water Basin (Basin 5-22). The San Joaquin River is the nearest surface water feature in the vicinity of the property, located approximately 1,500 feet east of the site. The San Joaquin River is primarily used for commercial and recreational boating, as well as agriculture; its channel continually contains water and has a potential tidal effect upon ground water depth or flow direction in the area. 2.2. PREVIOUS SITE ASSESSMENT AND SAMPLING On 12 December 2007, twenty-six potholes were excavated in the estimated outlying area of the former glass disposal site. The potholes were excavated utilizing an excavator, to depths between 3.5 and 8.5 feet below surface grade (bsg). The actual area of the glass disposal site was determined to be approximately 180, 500 square feet. Soil samples were collected from six of the twenty six potholes, as directed by the EHD, from depths between 3.5 feet and 7 feet bsg. • Total petroleum hydrocarbons as diesel (TPH-d) was reported in two of the soil samples, at concentrations of 1,200 milligrams per kilogram (mg/kg: S-2802) and 610 mg/kg (S-2805). • Barium was detected in all six soil samples, at a maximum concentration of 210 mg/kg (S - 2800A). • Zinc was detected in five of the six samples, at a maximum concentration of 21 mg/kg (S- 2800). • Chromium and vanadium was detected in three of the six soil samples, at maximum concentrations of 9.9 mg/kg (S-2800) and 19 mg/kg (S-2800), respectively. • Copper was detected in two of the six soil samples, at a maximum concentration of 52 mg/kg (S -2800A). • Lead was detected in one of the six soil samples, at a concentration of 53 mg/kg (S -2800A). A summary of analytical results is included in Tables 1 and 2. Complete results, including laboratory Advanced GeoEnvironmental, Inc.