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14 August 2000 AGE-NC Project No..98-0492 Page.7 of 8. volatile organic compounds using an organic vapor meter(OVM), equipped with photo-ionization detector(PID): 4.1.2. Grab Ground Water Sampling Procedures 1 For the collcction of`grab' ground water samples,probe borings will be advanced to a depth of four feet below the ground water surface. The grab groun4 water samples will be collected using a Geoprobc-water sampling assembly with a wire-wou*d steel screen.or a pre-cleaned .one-inch diameter,'0:01 slotted screen: Each'ground water sample will be.extracted by lowering a Teflon -bailer through the hollow center of the push rods into the Iscreened section.Samples will be collected in laboratory-supplied,40-m1 VOA--vials containing 0.5' 1 hydrochloric acid as sample preservative and into 1-liter amber bottles without a sample preservative. The labeled vials will be.-placed in a chilled container under ice and transported under chain}of-custody to-a DHS-certified laboratory. 4.1.3. Equipment Decontamination Prior to use, all sarriplixig tools used for-sample collectioo will be thoroughly rinsedwith clean water after being .washed with a.solution of Alconox. A 1 probing rods will be cleaned prior to advancement at each probe boring location. 4.1.4. Boring Abandonment All probe borings will be permanently sealed to preve t vertical migration of contaminants. Soil borings shall be.abandoned by backfilling with portlanq from the total depth to.surface grade. 4.2. RECEPTOR SURVEY —_— A search for all potential-ground water conduits within ai2,000-foot radius of the site will consist of the following: • A search of driller's water well logs on.file witl�the Department of Water Resources; • A reconnaissance of visually observable potenti receptors; A search for City for Manteca municipal well ldcations; • A search for San Joaquin County water well locations with PHS-EHD; . ; I , Advanced Gei)k vironmekal,inc..