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ATTACHMENT C <br />2009-0009-DWQ as amended by 2010-0014-DWQ & 2012-2006-DWQ <br />12 <br />presence of pollutants identified in the pollutant source assessment <br />required (Risk Level 1 dischargers shall modify their CSMPs to <br />address these additional parameters in accordance with any <br />updated SWPPP pollutant source assessment). <br /> <br />f. Risk Level 1 dischargers shall collect a sample of storm water that <br />has not come in contact with the disturbed soil or the materials <br />stored or used on-site (uncontaminated sample) for comparison <br />with the discharge sample. <br /> <br />g. Risk Level 1 dischargers shall compare the uncontaminated sample <br />to the samples of discharge using field analysis or through <br />laboratory analysis.2 <br /> <br />h. Risk Level 1 dischargers shall keep all field /or analytical data in the <br />SWPPP document. <br /> <br />8. Risk Level 1 – Particle Size Analysis for Project Risk Justification <br /> <br />Risk Level 1 dischargers justifying an alternative project risk shall <br />report a soil particle size analysis used to determine the RUSLE K- <br />Factor. ASTM D-422 (Standard Test Method for Particle-Size Analysis <br />of Soils), as revised, shall be used to determine the percentages of <br />sand, very fine sand, silt, and clay on the site. <br /> <br />9. Risk Level 1 – Records <br /> <br />Risk Level 1 dischargers shall retain records of all storm water <br />monitoring information and copies of all reports (including Annual <br />Reports) for a period of at least three years. Risk Level 1 dischargers <br />shall retain all records on-site while construction is ongoing. These <br />records include: <br /> <br />a. The date, place, time of facility inspections, sampling, visual <br />observation (inspections), and/or measurements, including <br />precipitation. <br /> <br />b. The individual(s) who performed the facility inspections, sampling, <br />visual observation (inspections), and or measurements. <br /> <br />c. The date and approximate time of analyses. <br /> <br />d. The individual(s) who performed the analyses. <br /> <br />2 For laboratory analysis, all sampling, sample preservation, and analyses must be conducted according to <br />test procedures under 40 CFR Part 136. Field discharge samples shall be collected and analyzed according <br />to the specifications of the manufacturer of the sampling devices employed.