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:wered Developed <br /> A a(Study Area) <br /> X <br /> ''�� �-'\ ® <br /> N <br /> Sewered Areas <br /> ........... <br /> C7 <br /> ................ <br /> .............. <br /> 0 Water Wells Sampled <br /> ................. <br /> Ground-Wafar <br /> ................... <br /> ................... <br /> X-1 Flow Direct n <br /> ION <br /> Ay ... ......... <br /> K. <br /> 0 <br /> 1/2 1 Mile 2 Miles <br /> OLOT <br /> 4. S X RAM NTO AVE <br /> TO <br /> ........... <br /> HUMBUG 01 <br /> TOH q°• 0 <br /> vto- <br /> S%,j elk <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 /> _j N <br /> assumption of 150 gpd/DU was used for this calculation. <br /> MORRO <br /> B A Y .§ANT. P�SEL <br /> III The final entry expresses the waste-water loading,1,as a <br /> fraction of the annual rainfall recharge,R,for each study <br /> ------- <br /> BAYWOOD f area(from Table 1). <br /> PARK <br /> -—------------- <br /> Ground-Water Ouefity Data <br /> In each of the three study areas,the effects of septic <br /> AF systems on ground-water quality have been a concern of the <br /> RD. • local health department and the respective California <br /> LOS <br /> Regional Water Quality Control Board(there are nine such <br /> Regional Boards in California). As a result of these con- <br /> LOS Ro. cerns, water quality sampling programs were conducted <br /> osos <br /> 0 (DWR,1984;CSWRCB,1989;CRWQCB,1983/84;Questa, <br /> 1987). 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— monitoring wells were installed in the shallow marine terrace <br /> aquifer specifically for the purpose of monitoring septic <br /> 01/4 1/2 3/4 1 Mile 2 Miles <br /> L I I I 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 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 />