{"id":62,"date":"2021-06-21T21:09:53","date_gmt":"2021-06-21T21:09:53","guid":{"rendered":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/exercise-2\/"},"modified":"2021-06-22T22:19:01","modified_gmt":"2021-06-22T22:19:01","slug":"exercise-2","status":"publish","type":"chapter","link":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/exercise-2\/","title":{"raw":"Exercise 2","rendered":"Exercise 2"},"content":{"raw":"<div class=\"exercise-2\">\r\n<p class=\"import-Normal\">The Long Point septic system plume (<a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/bacteria\/#figure2\">Figure 2<\/a>) has <em>NO<\/em><sub><em>3<\/em><\/sub><sup><em>-<\/em><\/sup><em>-<\/em><em>N<\/em> of about 50 mg\/L, but this nitrate is completely attenuated at a reaction front located about 20 m downgradient of the drainfield. The aquifer contains trace amounts of reduced <em>S<\/em> (0.02 percent by weight) reflecting the presence of biogenic pyrite (Aravena and Robertson, 1998), and this material contributes to autotrophic denitrification (<a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/part\/fate-of-nitrogen-in-septic-system-plumes\/#equation14\">Equation 14<\/a>).<\/p>\r\n<p class=\"import-Normal\">The average linear groundwater velocity in this plume zone has been estimated to be 28 m\/yr (Robertson, 2008). Assuming that all of the <em>NO<\/em><sub class=\"import-SubscriptChar\"><em>3<\/em><\/sub><sup class=\"import-SuperscriptChar\"><em>-<\/em><\/sup> loss is attributable to autotrophic denitrification utilizing the reduced sulfur compounds, how fast will the nitrate plume advance, based on the rate of <em>S<\/em> consumption? The aquifer has a dry bulk density of 1.8 g\/cm<sup>3<\/sup> and saturated porosity of 0.3.<\/p>\r\n<p class=\"import-Normal\" style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/solution-exercise-2\/\"><span class=\"import-Hyperlink\">Click for solution to exercise 2<\/span><\/a><\/p>\r\n\r\n<\/div>","rendered":"<div class=\"exercise-2\">\n<p class=\"import-Normal\">The Long Point septic system plume (<a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/bacteria\/#figure2\">Figure 2<\/a>) has <em>NO<\/em><sub><em>3<\/em><\/sub><sup><em>&#8211;<\/em><\/sup><em>&#8211;<\/em><em>N<\/em> of about 50 mg\/L, but this nitrate is completely attenuated at a reaction front located about 20 m downgradient of the drainfield. The aquifer contains trace amounts of reduced <em>S<\/em> (0.02 percent by weight) reflecting the presence of biogenic pyrite (Aravena and Robertson, 1998), and this material contributes to autotrophic denitrification (<a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/part\/fate-of-nitrogen-in-septic-system-plumes\/#equation14\">Equation 14<\/a>).<\/p>\n<p class=\"import-Normal\">The average linear groundwater velocity in this plume zone has been estimated to be 28 m\/yr (Robertson, 2008). Assuming that all of the <em>NO<\/em><sub class=\"import-SubscriptChar\"><em>3<\/em><\/sub><sup class=\"import-SuperscriptChar\"><em>&#8211;<\/em><\/sup> loss is attributable to autotrophic denitrification utilizing the reduced sulfur compounds, how fast will the nitrate plume advance, based on the rate of <em>S<\/em> consumption? The aquifer has a dry bulk density of 1.8 g\/cm<sup>3<\/sup> and saturated porosity of 0.3.<\/p>\n<p class=\"import-Normal\" style=\"text-align: right;\"><a href=\"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/chapter\/solution-exercise-2\/\"><span class=\"import-Hyperlink\">Click for solution to exercise 2<\/span><\/a><\/p>\n<\/div>\n","protected":false},"author":1,"menu_order":13,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-62","chapter","type-chapter","status-publish","hentry"],"part":181,"_links":{"self":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/62","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":4,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/62\/revisions"}],"predecessor-version":[{"id":238,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/62\/revisions\/238"}],"part":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/parts\/181"}],"metadata":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapters\/62\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/media?parent=62"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/pressbooks\/v2\/chapter-type?post=62"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/contributor?post=62"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/books.gw-project.org\/septic-system-impacts-on-groundwater-quality\/wp-json\/wp\/v2\/license?post=62"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}