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C.Wet Season Visual Observations <br /> During the wet season (October' through April) visual observations of <br /> all storm water discharge locations (numbers 1-5 as stated above) will <br /> be conducted during the first hour, whenever possible, of one storm <br /> event per month that produces significant storm water discharges. If <br /> it is not possible to make the observations during the first hour of the <br /> storm event the observations will be made as soon as possible <br /> thereafter and noted in the annual report. <br /> d.Sampling and Analysis <br /> During the wet season Robertson-Ceco Corp. personnel will estimate the <br /> volume ofstormwater discharge from each out fall and collect and <br /> analyze samples of storm water discharge from at least two sampling <br /> events which produce a significant storm water discharge. <br /> Sample Location <br /> Storm water samples will be taken from a representative sample point located along the drainage <br /> ditch down gradient from the hazardous materials and waste storage area. This site is <br /> representative because operations and all types of storage can be effectively monitored for <br /> potential pollutants at this point. Also, the drainage ditch at this point exhibits a flow during <br /> most rains, and sampling from a point further towards the pond where the flow is ephemeral may <br /> not be as representative (refer to Map). <br /> Sampling Procedures <br /> The monitoring methods-described in this section have been selected <br /> to best represent/characterize storm water run-off from the <br /> industrialized portions of the facility. <br /> Samples will be taken in accordance with all accepted standard <br /> practices. Storm water sampling shall consist of a grab sample from a <br /> storm event that produces significant storm water discharge that is <br /> preceded by at least three days of dry weather when industrial <br /> activity has occurred. The grab sample shall be taken during the <br /> first thirty minutes of the discharge. If the collection of the grab <br /> sample during the first thirty minute is impracticable, the grab <br /> sample will be taken as soon as practicable during the storm <br /> event, and it shall be explained in the annual monitoring report <br /> why the grab sample could not be taken in the first thirty <br /> minutes. <br />