Category II Critical Aquifer Recharge Areas

Critical Aquifer Recharge Areas means those land areas that contain hydrogeologic conditions that facilitate aquifer recharge and/or transmit contaminants to an underlying aquifer. Critical aquifer recharge areas under this title may be established based on general criteria, specifically designated due to special circumstances, or based on scientific studies and mapping efforts. Factors considered in the identification of critical aquifer recharge areas include depth to water table, presence of highly permeable soils (specifically Group A Hydrologic Soils), presence of flat terrain, and the presence of more permeable surficial geology. Category II critical aquifer recharge areas are areas that provide recharge effects to aquifers that are current or potentially will become potable water supplies and are vulnerable to contamination based on the type of land use activity. Category II critical aquifer recharge areas include: 1. Highly Permeable Soils (Group A Hydrologic Soils). 2. Areas above shallow aquifers and/or surface areas which are not separated from the underlying aquifers by an impermeable layer that provides adequate protections from contamination to the aquifer(s) below. 3. Areas above the Vashon Aquifer. Surface areas above the Vashon Aquifer which are not separated from the underlying aquifers by a poorly permeable layer that provides adequate protections to preclude the proposed land use from contaminating the Vashon aquifer below. Vashon aquifers in Kitsap County are typically mapped as "Qva" (Vashon advance aquifer) or "Qvr" (Vashon recessional aquifer) on geologic maps. 4. Areas with high concentration of potable water supply wells.关键含水层补给区（Critical Aquifer Recharge Areas）系指具备有利于含水层补给的水文地质条件，或可将污染物输送至下伏含水层的陆地区域。本标题项下的关键含水层补给区，可依据通用标准设立，亦可因特殊情形专门划定，或基于科学研究与制图工作确定。划定关键含水层补给区时需考量的因素包括：地下水位埋深、高渗透性土壤（A类水文土壤（Group A Hydrologic Soils））的分布、平缓地形，以及高渗透性表层地质的存在。 第二类关键含水层补给区，指可为当前或潜在饮用水供水水源的含水层提供补给，且因土地利用活动类型而易受污染的区域。此类区域包括： 1. 高渗透性土壤（A类水文土壤（Group A Hydrologic Soils））； 2. 浅部含水层上方区域，以及未通过具备足够污染防护能力的隔水层与下伏含水层分隔的地表区域，此类区域无法为下方含水层提供充分保护； 3. 瓦什含水层（Vashon Aquifer）上方区域。具体为未通过具备足够防护能力的弱透水层与下伏含水层分隔的瓦什含水层上方地表区域，此类区域无法阻止拟开展的土地利用活动污染下方的瓦什含水层。基茨普县（Kitsap County）内的瓦什含水层通常在地质图上被标注为"Qva"（瓦什推进含水层）或"Qvr"（瓦什退覆含水层）； 4. 集中分布饮用水供水井的区域。