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w ,,.IDeveloped <br /> Areas (Study <br /> y Area) <br /> ss ;: �. �. <br /> Sew Bred Areas <br /> ........... <br /> _ ::. ::.�::::: �J��'-"`� ® <br /> T. <br /> • <br /> ........... <br /> 0 Water Wells Sampled <br /> ...... Ground-Water <br /> low Direction <br /> HIGHW <br /> 0 1/2 1 Mile 2 Miles <br /> C U­UL-DT <br /> 75 <br /> a SA AMENTO, AVE.:::"' <br /> X... <br /> • <br /> . ................. <br /> ........... <br /> Q <br /> HUMBUG Ott <br /> 0 <br /> 40 <br /> Fig.5.Map of Chico study area. <br /> for land area and dwelling units. The waste-water loading <br /> (inches/year)reflects the discharge from all existing waste <br /> IN water systems, averaged over the entire study area. An <br /> assumption of 150 gpd/DU was used for this calculation. <br /> �MORRO <br /> BAY_- SANTA YSABEL The final entry expresses the waste-water loading, 1, as a <br /> fraction of the annual rainfall recharge, R, for each study <br /> BAYW <br /> -------OOD area(from Table 1). <br /> PARK <br /> Ground-Water Quality Data <br /> In each of the three study areas, the effects of septic <br /> systems on ground-water quality have been a concern of the <br /> RD, local health department and the respective California <br /> Los Regional Water Quality Control Board(there are nine such <br /> 4V 0 0808 <br /> Regional Boards in California). As a result of these con- <br /> LOS qD. cern, water quality sampling programs were conducted <br /> 0SOS <br /> 0 (DWR,1984;CSWRCB,1989;CRWQCB,1983/84;Questa, <br /> q1987). Representative data compiled from these sampling <br /> programs are summarized in Table 3. <br /> BAYWOOD-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 /> 0 1/4 1/2 V4 I Mile 2 Miles <br /> system effects on ground waters. Well locations are shown <br /> on Figure 4. Samples were collected during the 1985-86 <br /> 0 Water Wells Sampled 10 Ground-Water Flow Direction 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 />