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I <br /> Report-Groundwater Invest.,sation <br /> First Student Bus Facility(Former A.W. Hayes Facility) <br /> 2005 Navy Drive—Stockton, CA <br /> The groundwater samples were collected using new disposable bailers and transferred <br /> into appropriate containers provided by the analytical laboratory. The collected samples <br /> were labeled with a sample identification number, date, time, sampler's identification and <br /> requested analysis, and placed into an ice cooled chest with a completed Chain-of- <br /> Custody. <br /> Groundwater Flow Direction and Gradient <br /> The groundwater flow direction and gradient were determined using current sounding <br /> measurements. The groundwater flow direction measured beneath the Site is <br /> approximately north 45° west with an average gradient of 0.0015 ft/ft. Elevations for <br /> groundwater encountered in each of the monitoring wells are summarized in Table 2, and <br /> the groundwater flow direction at the Site is illustrated on Figure 2— Site Plan. <br /> E. LABORATORY ANALYSIS OF GROUNDWATER SAMPLES <br /> The three (3) groundwater samples collected during this investigation(MW-1, MW-3 and <br /> MW-4) were transported at 4° C, under standard Chain-of-Custody procedures, to a State <br /> certified laboratory- California Laboratory Services, Inc. located at 3249 Fitzgerald Road <br /> in Rancho Cordova, California. <br /> The three (3) groundwater samples collected from the monitoring wells on November 18, <br /> 2008 were analyzed for total petroleum hydrocarbons as diesel (TPH-d) by EPA Method <br /> 8015M; total petroleum hydrocarbons as gasoline (TPH-g) by GC FID; and volatile <br /> organic compounds (VOCs) by 8260B. The Laboratory Analytical Reports and Chain- <br /> of-Custody documentation for the groundwater samples are included in Appendix C. <br /> Groundwater laboratory test results are presented below in Table 4. <br /> Table 4-Groundwater Sampling Anal tical Results November 18,2008) <br /> Sample TPH TPH 1,1 Cis-1,2 Trans-1,2- Vinyl <br /> Identification Diesel Gas Dichloroethene Dichloroethene Dichloroethene Chloride <br /> MW-1 ND ND 4.2 ug/L 1100 ug/L 94 ug/L 1.2 ug/L <br /> MW-3 ND ND ND ND ND ND <br /> MW-4 ND I ND ND 5.6 u L 1.2 ug/L ND <br /> ug/L—microgram/Liter(parts per billion) <br /> ND—Not detected at concentrations greater than the method detection limit(MDL) <br /> 7 <br />