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CHAPTER 6. ENVIRONMENTAL REGULATIONS <br />R„, ,,, <br />DIVISION 4: POST -CONSTRUCTION STORMWATER PERFORMANCE STANDARDS <br />Section 6.1.4.1 Stormwater Quality and Stream Protection <br />” (" " V). -Q Stroar�r I'rc,-rt�E ction Volume is based on the amount of <br />A. ��u^°��,i�a�uu II•�°°°�;u�� a �u�u�p Volume �Ih, .. .. <br />runoff produced over the developed area from the listed rainfall amount identified in Section 6.1.4.1(C). <br />1. u,JnWQV shall be retained or detained on-site. Drawdown time shall be 48 -hours. <br />2. The 90th percentile rainfall event for San Marcos is 1.6 inches <br />3. The 85th percentile rainfall event for San Marcos is 1.25 inches. <br />B Storrriw ater Quality Treatment. Required stoniwater quality treatment levels for different locations d <br />are listed in the table below and represents the percent <br />reduction in the increased total &4s-ps=Pe4e4 „solids <br />load. <br />C. Wa4e-p4Rva4y Stu°°�,Faruu II•Y'roiea don..Volume and St,orruuwa <br />er” Treatment Level Table <br />Treatment Leven Ta <br />u cyte ° ki ii°i Volume and � cc ii ii inw aeiii° Table <br />, e 6W 15!,t.0 a. a a u°i� �'°. ... <br />LOCATION VIII"PV AM ' .I. DESIGN S IIL0lF1;\4 WA IIi WW <br />RAINFALL TREATMENT LEVEL <br />Edwards Aquifer Recharge Zone 1.60" 89% <br />Edwards Aquifer Transition Zone 1.25" 85% <br />and Contributing Zone within the <br />Transition Zone <br />San Marcos River Protection Zone 1.25" 80% <br />San Marcos River Corridor 1.60" 89% <br />D. Exceptions to stormwater quality and stream protection volume requirements are allowed under the following conditions <br />provided that disconnected impervious cover and treatment through vegetative filter strips or similar means is included: <br />1. Development applications proposing solely the construction or expansion of a single family home. <br />page 4 of 28 <br />