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Appendix C:Initial Study Checklist Former Marley Cooling Tower Company,Stockton,CA <br /> d. Expose sensitive receptors to substantial pollutant concentrations. <br /> Impact Analysis: A limited increase in air pollutants is predicted. Equipment used at the site during the proposed RAP <br /> activities will consist of(2)drill rigs, (2)fork lifts, (2)tanker trucks, and miscellaneous support vehicles. All equipment <br /> meets current California State emissions requirements, and therefore will not significantly impact air quality standards. <br /> Conclusion: <br /> ❑ Potentially Significant Impact <br /> ❑ Potentially Significant Unless Mitigated <br /> 0 Less Than Significant Impact <br /> ❑ No Impact <br /> e. Create objectionable odors affecting a substantial number of people. <br /> Impact Analysis: Diesel trucks and drill rigs may have a slight unpleasant odor for the local residents during <br /> construction hours. However, no long-term odors will be present once drilling is complete. Injection reductant solution <br /> is made of mostly sulfate and can have a sulfur odor commonly compared with "rotten eggs. The solution will be <br /> contained Inside tanks and conveyance hoses until injection occurs In an effort to minimize exposure to the public and <br /> outside environment, No specific air monitoring is proposed during the injection activities. <br /> Conclusion: <br /> ❑ Potentially Significant Impact <br /> ❑ Potentially Significant Unless Mitigated <br /> ® Less Than Significant Impact <br /> ❑ No Impact <br /> f. Result in human exposure to Naturally Occurring Asbestos (see also Geology and Soils, f.). <br /> Impact Analysis: No exposure to Asbestos is anticipated based on local geology and previous soil samples collected <br /> at the site. <br /> Conclusion: <br /> ❑ Potentially Significant Impact <br /> ❑ Potentially Significant Unless Mitigated <br /> ❑ Less Than Significant Impact <br /> ® No Impact <br /> References Used. <br /> 1, 3, 5, 8 <br /> 4. Biological Resources <br /> Description of Baseline Environmental Conditions: The site is completely paved and surrounded by a residential and light <br /> industrial area. There are no natural habitats that will be affected by the proposed action, and due to the highly disturbed <br /> nature of the project site, no sensitive species are expected to inhabit the area or surrounding lands. Pumping and <br /> treating extracted groundwater is currently on-going at the site. The treated groundwater is discharged to the Stockton <br /> Drainage Canal under an existing NPDES permit. An ecological assessment was completed in 1990 (Ecological <br /> Assessment by Clement Associates in May 1990 as part of the Remedial Investigation/Feasibility Study(RI/FS) Volume <br /> IV, dated May 1990) which found no adverse effects were expected in the local flora, or the terrestrial wildlife consuming <br /> water or fish from the Stockton Diverting Canal. Aquatic life in the canal was also not expected to be adversely affected. <br /> As a result of no significant biological change in the immediate area of the site, information provided within the 1990 <br /> Ecological Assessment has been determined relevant today. Additional ecological assessment is not suggested at this <br /> time based on the proposed remedial action for the site and surrounding areas. <br /> An October 3, 2006, Department of Fish and Game, Natural Diversity Database report for the Stockton East quadrant was <br /> reviewed. Two species have been sighted near the Stockton Diverting Canal as follows, <br /> The Suisun marsh aster(Aster lentus), listed on the California Native Plant Society list 1 B was sighted at the bottom of the <br /> Stockton Diverting Canal, north of the bridge crossing of Copperolls Road, East of Stockton. This occurrence was noted in <br /> 1962. This species' is found in marshes and swamps, and brackish freshwater, It is most often seen along sloughs with <br /> phragmites, scripus, blackberry,and typha. <br /> Page 8 of 25 <br />