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CEARWATER <br /> [ l (1 L P I \ C <br />' 1.0 INTRODUCTION <br /> This report presents the results of groundwater monitoring performed by <br /> Clearwater Group, Inc (Clearwater) on March 7, 1995 at 4491 West Durham Ferry <br /> Road in Tracy, California The location of the site is shown on Figure 1 The tasks <br /> performed during this phase of work included groundwater gauging, well purging <br /> and groundwater sample collection <br /> 2.0 BACKGROUND <br /> The site is currently occupied by a grocery store, which formerly stored and <br /> dispensed motor fuel from underground storage tanks located beneath the <br /> southwestern corner of the property A site assessment was initiated several years <br /> ago, with the most recent phase of investigative activity consisting of the drilling of <br /> several soil borings, the collection of discrete water samples from the borings, and <br /> the construction of several groundwater monitoring wells and three vapor <br /> extraction wells The results of these activities have been presented in reports <br /> prepared by Delta Environmental Consultants and RESNA <br /> 3.0 HZID AC=.LTIES <br /> All field work was conducted according to Clearwater Field Procedures (previously <br /> submitted) which are consistent with both local and state guidelines Prior to <br /> sampling, each monitoring well was inspected for the presence of separate-phase <br /> hydrocarbons (SPH) and gauged to the nearest hundredth of a foot. The depth to <br /> groundwater was measured from the survey mark on top of each well casing. The <br /> wells that did not contain SPH were then purged of at least three well casing <br /> volumes until purging parameters stabilized or until the well went dry Monitoring <br /> well purge/sample data sheets are included as Appendix B <br /> Groundwater samples were collected from monitoring wells Each groundwater <br /> sample was collected with a dedicated polyethylene bailer and was transferred to <br /> sample containers appropriate for the required analyses. Sample containers were <br /> labeled and placed in a cooler. A chain-of-custody was prepared and accompanied <br /> the samples to the laboratory Groundwater sample analysis was performed by <br /> PACE, Inc , DHS-certified laboratory located in Novato, California All groundwater <br /> samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA <br /> Method 8015 (CA LUFT modified), and for benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX) by EPA Method 8020 (CA LUFT modified) <br /> D-107 QMR 1 4/21/95 <br /> 1 <br />