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c C 1./71 Each .of these presented same success and further investigatian with these chemicals will cantinue. Future wark will entail varying strength of salutian, expasing bacteria which cause biafauling ta chemicals far extended periads, and experimenting with the sequence that chemical combinations are injected inta a well. A well redevelapment surging taol was used at twa well sites in canjunctian with chemicals and may be used again alang with ather surging and jetting equipment. In additian ta the search far mare effective bi.ofauling cantral techniques, Reclamatian is researching the full nature .of the well pr.oductian in .order ta develap a mare camprehensive plan in 1998 far lang term salutians. A number .of cansultants and persannel fram the Reclamatian Technical Service Center in Denver are warking with Clased Basin Divisian emplayees ta salve prablems regarding the grass carp, algae, and biafauling. Aquatic weeds, sand and debris have been remaved fram the channel in frant .of the farebay trash rack .of the San Luis Lake Pumping Plant. This material was remaved with a clam shell bucket and crane. Riprap and pitrun aggregate material was placed alang the west edge .of this channel ta help preventfuture erasian .of sand inta the farebay area. Rem.oval .of the traveling screen unit far replacement .of th~. e carrasian pr.otectian caating and .overhaul .of all mechanical campanents is scheduled .or Fiscal Year (FY) 1999. Water Quality \ Water quality manit.oring .of praject wells, the Ria Grande, Parshall Flume, Feeder Canal, Head Lake, and San Luis Lake continued during 1997. Water quality was manitared at Big Spring Creek Flume fram February ta Octaberand in the spring at San Luis Lake Flume when water was flawing at this lacatian. In December manitaring .of the canal was changed from the Parshall Flume ta the .outlet structure at the canfluence .of the canal and the Ria Grande. In July analysis .of samples far mast trace metals was changed fram unfiltered ta filtered samples. This gives values far dissalved metals and agrees with the current stream standards set by the Calarada Water Quality Cantral Cammissian which specify dissalved metal values except far arsenic, iran, and mercury. These three metals are determined as "tatal recoverable" using the pracedure. specified by the Enviranmental Pratectian Agency (EPA). ), - , . The Water Quality Labaratary participated in the USGS Evaluatian Pragram far Standard Reference Water Samples. Twa sets .of samples were distributed, .one in April. and .one in Octaber. Results are rated an a scale .of 0 t.o 4. The .overall rating was 3.5 far the April samples; results far the Octaber samples have nat been received. t~ 4