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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL, <br /> I Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature I ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> B Surface Open-celled Sediment or debris accumulation in grid voids. Remove/dispose <br /> paving grid with <br /> gravel <br /> A Surface Open-celled Loss.of soil and/or grass material in grid. Refill and/or replantper manufacturer's <br /> paving grid with recommendations. <br /> gravel <br /> 1 Surface Open-celled Sediment or debris accumulation in grid voids. Remove/dispose. <br /> paving grid with <br /> grass <br /> A Surface Open-celled Loss of soil and/or grass material in grid. Refill and/orreplant per manufacturer's <br /> paving grid with recommendations. <br /> grass <br /> Ongoing Spill Spill prevention Storage or use of potential contaminants in the Exercise spill prevention measures <br /> Prevention vicinity of facility: whenever handling or storing potential <br /> and Response contaminants <br /> As needed Spill Spill response Release of pollutants.Call to report any spill to. Cleanup:spills.as soon as possible to. <br /> Prevention the Washington Dept of Emergency prevent contamination of stormy,rater. <br /> and Response Management 1-800-258-5990 <br /> If you are unsure whether a problem exists, please contact a professional engineer. <br /> Note: For proprietary products,other varied conditions may exist. The manufacturer's product specific O&M requirements shall be performed, if <br /> any, at the recommended frequency. <br /> Comments: <br /> Key: (M) Monthly from November through April. <br /> (A) Annually,once in late summer(preferable September) <br /> (S) After any major storm(use 1-inch in 24 hours as a guideline). <br /> (B) Biannually(spring and fall) <br /> (Q) Quarterly <br /> Appendices <br /> Everett Mall Plaza Parcel Ill Retail Expansion Stormwater Site Plan Page 86 <br />