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Quarterly Ground Water Monitoring Report- Third Quarter 2008 <br /> ARROYO'S SMOG SHOP <br /> 3012 East Waterloo Road, California <br /> 1.0. INTRODUCTION <br /> At the request of Ms. Erlinda Hernandez,Advanced GeoEnvironmental, Inc. (AGE) has prepared <br /> this report for 3012 East Waterloo Road, Stockton, California(site). The scope of work included <br /> performance of a quarterly ground water monitoring event and preparation of this report.This report f <br /> was prepared in accordance with Central Valley Regional Water Quality Control Board guidelines <br /> for the investigation of underground storage tank(UST) sites. <br /> Site and surrounding area are illustrated in Figure 1. Structures, soil borings, and monitoring well <br /> locations are illustrated in Figure 2. Site Background information is provided in Appendix A. <br /> Three ground water monitoring wells were installed at the eastern edge of the site(MW-10,MW-11 <br /> and MW-12)in conjunction with the ground water assessment of the dissolved hydrocarbon'plume <br /> from the site at 3032 East Waterloo Road,however,these wells are not included in this investigation. <br /> 2.0. PROCEDURES <br /> On 26 September 2008,a quarterly groundwater monitoring event was conducted utilizing site wells <br /> MW-1, MW-2, and MW-3. Monitoring was performed in accordance with AGE's standard <br /> monitoring and sampling procedures,providedrin Appendix B. Field data and logs are provided in <br /> Appendix C.No exceptions to AGE's standard procedures were noted. <br /> i <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 26 September 2008;contaminant impact to ground water was quantified by the laboratory analytical j <br /> data. Findings are as follows: <br /> • Depths to ground water ranged between 58.91 feet(MW-2)below the top of the well casing <br /> (btoc) and 59.81 feet (MW-3) btoc. Ground water elevations ranged between 35.05 feet <br /> (MW-2)below mean sea level(MSL) and 34.97 feet(MW-3)below MSL (Table 1). <br /> • Ground water flow was inferred to northwest under a calculated hydraulic .gradient of <br /> 0.003 foot per foot (ft/ft). Figure 3 illustrates the contoured ground water elevations as <br /> measured on 26 September 2008.- <br /> y0 Petroleum hydrocarbons were reported in all the ground water samples collected; total <br /> petroleum hydrocarbons quantified as gasoline(TPH-g)rangedbetween 350 micrograms per <br /> i <br /> Advanced GeoEnvironmental,Inc. <br /> I <br /> a <br /> 1 <br />