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S'O r <br /> Areas(r•d Developed <br /> Are..LStudY Area) <br /> " °° �. <br /> _f�'..�� ® ..-.,ad Are•• <br /> :'::: •.''i:Y::::: / • Willer Well.Sampled <br /> zOround-W ilter <br /> Flow DI <br /> rection <br /> 40 <br /> J F': <br /> 7 <br /> 0 <br /> 1/2 1 Mile 2 <br /> Mile. <br /> '� '�< • CHICO <br /> --LOT <br /> 1 y <br /> • SA RAM NTO AVE <br /> ...,..p,. Nl1MBU0 OITON kD <br /> 11 <br /> .lam J .. 4 • J�� <br /> Fig.5.Map of Chico study area. <br /> -------------- <br /> for land area and dwelling units.The waste-water loading <br /> _ '=_ _ (inches/year)reflects the discharge from all existing waste- <br /> _- water systems, averaged over the entire study area. An <br /> " assumption of 150 gpd/DU was used for this calculation. <br /> SANTA YBABEL The final entry expresses the waste-water loading,I,as a <br /> fraction of the annual rainfall recharge,R,for each study <br /> =====2===-=--- ---------___-___= BAYWOOD � area(fromTable I). <br /> _PARK <br /> Ground-Water Quality Data <br /> In each of the three study areas,the effects of septic <br /> S systems on ground-water quality have been a concern of the <br /> RD. local health department and the respective California <br /> sRegional Water Quality Control Board(there are nine such <br /> ° <br /> ALLPY Regional Boards in California).As a result of these con- <br /> LOS 0. terns, water quality sampling programs were conducted <br /> osos <br /> C, (DWR,1984;CSWRCB,1989;CRWQCB,1983/84;Questa, <br /> a" �� 1987). Representative data compiled from these sampling <br /> f programs are summarized in Table 3. <br /> 1 eAvw000-Los osos For the Bolinas Mesa area, some 30 ground-water <br /> STUDY AREA {_ <br /> monitoring wells were installed in the shallow marine terrace <br /> aquifer specifically for the purpose of monitoring septic <br /> o „ . ,,, ”` i Mlle I MII.s system effects on ground waters.Well locations are shown <br /> will.,wilco s.mp.d « D....d-W.I.r Flow 01-01.. on Figure 4. Samples were collected during the 1985-86 <br /> water year (October-September) and were analyzed for <br /> Fig.6.Map of Baywood-Los Osos study area. nitrate-nitrogen, ammonia, and total Kjeldahl nitrogen <br /> 495 <br />