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ecent ti <br /> cnts and 'Cti <br /> :o(DWR '1 —� f- f Unsewered Developed <br /> r / ..� Areas (Study Area) <br /> 5� 't in r( Dp �. <br /> ;ra*.,and- `�— <br /> support a / r + ?s;: <::::;<:,; .. Sewered Areas <br /> 0 Cy ON <br /> rectly by <br /> lischar a i►.:.:::.: :>: <br /> o <br /> o :............ • Water Wape Semplad <br /> Ti imm - <br /> ' <br /> e l <br /> r. >: <br /> :o depths . <br /> �pljjjj Ground-Water <br /> hick c � ;: � � <`;, <br /> Flow Direction <br /> lay' :: <br /> r <br /> ,ground HID <br /> id gravel �P <br /> vertical <br /> rttc <br /> a <br /> I <br /> 2 1 MII• 2 <br /> 0 1/ Miles <br /> n incised . •:::;:; . r ( t 1 <br /> :. ' . CHICO UMBOLD7 P <br /> • SA <br /> SAMINTO AVE•: i:�` 0` ./ rr <br /> porated ..% 'Vii;%>.'-•: <br /> an Luis • ' " f <br /> 6). The ` <br /> idential • <br /> �pment HUMBUG O,TCH HO <br /> on-site a f o i <br /> ,witha <br /> a half <br /> : range <br /> ). The <br /> /este-n <br /> ') !he Fig.5.Map of Chico study area. <br /> tquifer <br /> imary <br /> i thick <br /> ation. for land area and dwelling units. The waste-water loading <br /> :kness _ (inches/year) reflects the discharge from all existing waste- <br /> ncipal ___- _- _=___ N water systems, averaged over the entire study area. An <br /> assumption of 150 d <br /> in the .==-uoaRo =- _ ` p gp /DU was used for this calculation. <br /> 0 feet sAN7A I JYsBEL _{ The final entry expresses the waste-water loading, I, as a <br /> fraction of the annual rainfall recharge, R, for each study <br /> B A Y W O O D area (from Table 1). <br /> PARK <br /> )real, =__ __-` ~ Ground-Water Quality Data <br /> the _=-= In each of the three study areas, the effeci:. ; <br /> and 4F systems on ground-water quality have been a concern of the <br /> s are RD• l local health department and the respective California <br /> r the LOS os Regional Water Quality Control Board(there are nine such <br /> aper ,�v .°s Regional Boards in California). As a result of these con- <br /> eled, OSO <br /> OSOS "O terns, water quality sampling programs were conducted <br /> was 61' (DWR, 1984;CSWRCB, 1989;CRWQCB, 1983/84;Questa, <br /> for 1987). Representative data compiled from these sampling <br /> defy i I BAYWOOD—LOS OSOS programs are summarized in Table 3. <br /> eas. STUDY AREA—' For the Bolinas Mesa area, some 30 ground-water <br /> nits monitoring wells were installed in the shallow marine terrace <br /> )cu, aquifer specifically for the purpose of monitoring septic <br /> si ' ' '/` i MII' ? Mciesystem effects on ground waters. Well locations are shown <br /> ling 19 • w.t.r We"SsmDNd « Oreund-w.t.r Ftew otr.atten on Figure 4. Samples were collected during the 1985-86 <br /> per water year (October-September) and were analyzed for <br /> fres Fig.6.hfap of Baywood-Los Osos study arca. nitrate-nitrogen, ammonia, and total Kjeldahl nitrogen <br /> f <br /> 1�' 495 <br />