... consists of 20 jabs taken from a variety of habitats 392 Handbook of Water and Wastewater Treatment Plant Operations FIGURE 14. 5 D-frame aquatic net (From Spellman, F.R., Spellman’s Standard Handbook ... Spellman’s Standard Handbook for Wastewater Operators, Vol 1, Technomic Publ., Lancaster, PA, 1999.) 400 Handbook of Water and Wastewater Treatment Plant Operations State and local water quality ... and FIGURE 14. 10 Plankton net (From Spellman, F.R., Spellman’s Standard Handbook for Wastewater Operators, Vol 1, Technomic Publ., Lancaster, PA, 1999.) 398 Handbook of Water and Wastewater Treatment...