SITE INFORMATION AND CORRESPONDENCE 1980-1999

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114 rte a��,elif,rnia • • Deportm*nt of Health Services M e m o r a n d v m Tp , William Ii. � �• = AUG 23 1988 kS Executive Officer Subject: Central Valley Rsgioml Waste Discharge Water Quality Control Board Paqairewnts For 3443 Pzutier Road City Of Lodi White CA 95827 Sly Water Pollution C=tr=l FromBranCh Facility: 8/616 5-0498 The following discussion is germane to your board's consideration of waste discharge requirements for the City of Lodi's White Slough Water Pollution Cmltrol Facility. It identifies excess incidences of infections that could be incurred by water contact recreationists using receiving waters in Dredger Cut and Mite Slourb. Infection is the establis2m ent or growth of viable microcrganisms within the body. Excess incidences of infections are differences between incidences 2t1=)g water contact recm-sation.sts and la mr incidences o==ing in the genera Wim;ty. Disease, which can result from some infections, is a disturbance in the stricture or function of an organ or organs, caused by microorganisms or other agents. Flirt With Pnmosed_Tavel of_'I'r�eatTnPa'tt Given con=xztraticns of viruses and protozoan cysts typical of domestic sewage and the =jnwawnts in treatment proposed by the City of Lodi, a discharge to Dredger Cut of 8.5 MD effluent barely in cwapliance with the current waste discharge requirements (median effluent total coliform density 23/100 ml, with e==si.ons to 500/100 ml allowed) could result in high incidence of exams infection among water contact recreationists. Application of the avenge of published dose-infection response relationships for highly infective enterovirus and enterovirus of low infectivity and for the protozoan giardia lamblia, at the pres=ed ingestion rate of 100 milliliters (less than half the volume capacity of a standard household measuring cup) per visit involving swi=ing or dunkincs while water skiing, indicates that in that cir tante roughly seven persons could incur viral infections for every 1000 visitor-days and roughly 15 persons could incur infections by protozoa. A six to tee. dilution ratio in Dreg Cut is assumed, as in cated in the City's EM. Treatnent barely meeting the current waste discharge requirements ts would not provide protection of water contact recreationists in Smite Slough appreciably better than the unsatisfactory situation described above for perms who water ski or swim in Dredger Cut. At the preswved 10 to l dilution the incidence of viral infections could be roughly 4 per 1000 and the incidence of protozoa infecti ons could be 10 per 1000.