Storm Water Pollution Prevention Plan (SWPPP) - the City of Lompoc!

Sampling personnel will collect storm water grab samples at discharge locations according to proceduresoutlined in Section 4.5 Quality Assurance and Quality Control. Monitoring checklists are in Appendix F.Appendix C shows the monitoring locations for all monitoring.Sampling is not required outside of scheduled business hours or under dangerous conditions. An explanationof why samples were not taken will be included with on-site inspection documents.Storm water SamplingIt is expected that the site will have minimal sheet flow. For a qualifying rain event, a minimum of 3 samplesper day will be collected, if there is runoff from the site that originates in the project area. It should be ensuredthat storm water discharge collected and observed represent the effluent in each drainage area, based onvisual observation of the water and upstream conditions.Effluent will be analyzed for pH and turbidity and non-visible pollutant parameters (if applicable). Analysis ofpH will be performed on-site with a calibrated pH meter or a pH test kit. pH analysis only needs to occur whenhigh pH activities (like use of concrete, lime, gypsum) are undertaken during predicted rain (like use ofconcrete, lime, gypsum). Turbidity analysis will be performed using a calibrated turbidity meter either on-site orat an accredited lab.Risk Level 2 projects are subject to the following Numeric Action Levels (NALs):• pH 6.5 – 8.5• Turbidity 250 NTURun-on will be monitored only if there is reason to believe run-on may contribute to an exceedance of NALs.In the event that the storm event average of the samples exceeds an applicable NAL, Risk Level 2 dischargersmust electronically submit all storm event sampling results to the SWRCB’s SMARTS no later than 10 daysafter the conclusion of the storm event. In addition, the RWQCBs may request the submittal of an NALExceedance Report. The discharger must certify each NAL Exceedance Report in accordance with theGeneral Permit’s Special Provisions for Construction Activity.Non-Visible Pollutant SamplingIf there is a breach, spill or BMP failure, runoff potentially affected by the non-visible pollutants will be sampledwithin the first two hours of discharge. Ensure the grab samples collected of stored or contained storm waterare from discharges subsequent to a qualifying rain event (That which produces ½ inch or more at the time ofdischarge.), and that water samples taken are large enough to characterize the site conditions. Collect one ormore samples during any breach, malfunction, leak or spill observed during a visual inspection, which couldresult in the discharge of pollutants to surface waters that would not be visually detectable in storm water.Also, collect samples that have not come in contact with the disturbed soil or the materials stored or used onsitefor comparison with the discharge sample.Samples will be analyzed for all applicable non-visible pollutant parameters – indicating the presence ofpollutants identified in the pollutant source assessment required. The SWPPP shall be modified to identify anyadditional pollutants found.It is important to note that covered construction materials or those that are in their final constructed form, donot need to be monitored. Materials that are stored exposed to precipitation and may generate runoff need tobe considered for non-visible pollutant monitoring. Appendix H provides further guidance.Non-Storm water SamplingIf non-storm water is discharged off site, the effluent must be sampled. All non-storm water sample analysesshould be conducted by a state certified laboratory.Municipal Water Well No. 11 and Transmission Water Main – SWPPP July 20, 2010Page 17