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Cy • <br /> eweyed Developed <br /> Ar <br /> Areaas (Study Area) <br /> N s� <br /> _V <br /> .. <br /> • ..:.'::'::'`:`+ ...-�`�...`� .. ® Sew Bred Areas <br /> • <br /> • Water <br /> Wells Sampled <br /> ,�y <br /> Ground-Water <br /> Flow Direction <br /> 40 <br /> HIGHWA'>:;i <br /> V <br /> s• > <br /> 2 <br /> 0 <br /> 1/2 1 Mlle 2 Mlles <br /> LOT <br /> FA <br /> 1 � <br /> • SA RAM NT AVE.3:%:i• •� <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 /> _ - - water systems, averaged over the entire study area. An <br /> MORRO <br /> -- N assumption of 150 gpd/DU was used for this calculation. <br /> BAY._= _ - SANTA YSABEL The final entry expresses the waste-water loading, I, as a <br /> V fraction of the annual rainfall recharge, R, for each study <br /> - a n v w o o D area(from Table 1). <br /> _ - - PARK <br /> - - 1 Ground-Water Quality Data <br /> In each of the three study areas, the effects of septic <br /> Aw systems on ground-water quality have been a concern of the <br /> RD. local health department and the respective California <br /> J. LOS Regional Water Quality Control Board(there are nine such <br /> ,ems • O:°S ALL Regional Boards in California). As a result of these con- <br /> LOS <br /> on- <br /> LOS NO. cerns, water quality sampling programs were conducted <br /> O OSOS <br /> °r (DWR,1984;CSWRCB,1989;CRWQCB,1983/84;Questa, <br /> 1987). Representative data compiled from these sampling <br /> f 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 /> o ,/a 1/2 s/a i Mlle 2 Miles system effects on ground waters. Well locations are shown <br /> on Figure 4. Samples were collected during the 1985-86 <br /> • Water Wells Sampled « Ground-Water Flow Direction <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 />