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tormwater Discharge Observation Form <br /> 61 62 <br /> 7Sampfing: <br /> le n me-n _pent I <br /> cont.) <br /> •Sampling(cont.): <br /> storm event -one producing discharge from •Required sampling parameters include pH(field <br /> at least one drainage area,and preceded by 48 hours measurement),Oil&Grease,TSS,any pollutant on <br /> with no discharge from any area 303(d)list for receiving water body that could <br /> •Four QSEs must be sampled;two during first half of potentially be discharged,and any other pollutant of <br /> reporting year(Jul 1-Dec 31),and two during second half concern determined by discharger <br /> (Jan i-Jun 30);best to sample first two discharges during •Samples must be collected within the first four hours of <br /> each period to avoid missed opportunities the start of discharge,or within four hours of facility <br /> •After four successful sampling events with no opening and within 12 hours of discharge <br /> exceedances or other permit non-compliance events, •Monitoring Implementation Plan must be incorporated <br /> facility qualifies for sampling reduction to two events into SWPPP <br /> per year(one in each half of year);requires SWPPP <br /> update. <br /> 63 64 <br /> 63 64 <br /> n er Cu <br /> 7Numeric <br /> L ------ - - (cont.) --- - - <br /> ction Levels(NALs): •Exceedance Response Actions: <br /> f required sampling will be compared to two •If facility exceeds an annual or instantaneous NAL, <br /> types of NALs: status changes from Baseline to Level i <br /> •Annual NAL exceedance occurs when the average of •If facility exceeds an annual or instantaneous NAL for <br /> all analytical results for all samples collected during a the same parameter while in Level 1,status changes to <br /> reporting year for a given parameter exceeds annual Level a <br /> NAL value •Each level requires escalated response actions,including <br /> BMP evaluations,action plans,and technical reports <br /> • Instantaneous NAL exceedance occurs if two or more prepared by a Qualified Industrial Storm Water <br /> analytical results from samples taken for any Practitioner(QISP) <br /> parameter during a reporting year exceed •Dischargers that enter Level i status must ensure a QISP <br /> instantaneous NAL values provides adequate training to appropriate team <br /> members <br /> 65 66 <br /> 65 66 <br /> 11 <br />