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Evaluation of the Mission, Santee, and Tijuana Hydrologic Subareas

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Evaluation of the Mission, Santee, and Tijuana Hydrologic Subareas EVALUATION OF THE MISSION, SANTEE, AND TIJUANA HYDROLOGIC SUBAREAS FOR RECLAIMED-WATER USE, SAN DIEGO COUNTY, CALIFORNIA By John A. Izbicki U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 85-4032 Prepared in cooperation with the COUNTY OF SAN DIEGO WATER AUTHORITY and the CALIFORNIA DEPARTMENT OF WATER RESOURCES oo o I oo o o Sacramento, California December 1985 UNITED STATES DEPARTMENT OF THE INTERIOR DONALD PAUL HODEL, Secretary GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information write to: Copies of this report can be purchased from: District Chief Open-File Services Section U.S. Geological Survey Western Distribution Branch Federal Building, Room W-2234 U.S. Geological Survey 2800 Cottage Way Box 25425, Federal Center Sacramento, CA 95825 Denver, CO 80225 Telephone: (303) 236-7476 CONTENTS Page Abstract-- - - - -- -- -- _____ ___ ____ - - - i Introduction--------------------------------------------- -__-___----_-___ 2 Purpose and scope --- - __-_-_- ____ ____ ____ ____ 2 Location of hydrologic subareas--- ---- -- -- ------- _____ 3 Previous work and acknowledgments- ---- --- ____ _________________ 3 Data collection-- __-_---__-- _______ -__ _____ - ___________ _ 3 Field methods- _____ _____________ ____ _ ____________ 5 Laboratory methods----------------------------------------------- 5 Data limitations------------------------------------------------- 6 We11-numbering system----------------------- -__--_______----_____-__ 6 Climate and precipitation------------------------------------------ - 6 Mission hydrologic subarea---------------------- --_-----_____----___-_-__ g Geology-- ---- -- - __ - --- _ -- ___ -_-_ g Peninsular Range Province---------------------------------------- 8 Pacific Coastal Plain -- 8 Soils----------------------------------------------------------------- 8 Surface water----- ---- __________________ ___________ - 9 Streamflow characteristics--------------------------------------- 9 Surface-water quality-------------------------- ---_------___ _ 12 Ground water---------------------------------------------------------- 16 Peninsular Range Province---------------------- ----_- -__ __ 16 Pacific Coastal Plain--------- --_______-_-_ _ _______________ ig Alluvial aquifer------------------------------------------------- 17 Recharge ---- _______ _____ ___________________________ u Occurrence and movement------------------------------------- 21 Ground-water quality-------------------------------------------------- 26 Peninsular Range Province------------------------ -_-_________-_ 26 Pacific Coastal Plain --- - -- 26 Alluvial aquifer-- -_-------- _____ ____ ___ _________ 27 Historical water quality --- --- -- __-___- _______ 27 Present water quality--------------------------------------- 27 Reclaimed-water use--------------------------------------------------- 32 Reclaimed-water quality------------------------------------------ 32 Effects of reclaimed-water use----------------------------------- 32 Santee hydrologic subarea----------------------- _---__ ---_- __________ 33 Geology --- 33 Peninsular Range Province-------------------------------- ___-_- 33 Pacific Coastal Plain - - - -- 33 Soils 34 Surface water--------------------------------------------------------- 35 Streamflow characteristics--------------------------------------- 35 Surface-water quality-------------------------------------------- 38 Ground water---------------------------------- ______________________ 40 Peninsular Range Province- ______-_-- --_- --_ _________ _ 40 Pacific Coastal Plain 40 Alluvial aquifer------------------------------------------------- 40 III IV CONTENTS Page Santee hydrologic subarea Continued Ground water Continued Occurrence and movement----------- - --------------------- 42 jj round wate r qua X i ty 48 Peninsular Range Province--- -- -------- - ___--_ _________ 43 .taCiiic L>oastax ^*j_3jLn "* 48 rt-LA! -LTllTT-f LI V JLd oT -L aqua.O /"I 1 1 "1 I. ££*>*____________ ci ___ - ___ ___ ___ __________ «___ « ___ ___« __ ___ ______ ________________ _______ ______ ___ ___ j^v^A O Historical water quality ---- --- -_-- ___-___--__-_____ 49 Present water quality ---------- - _______ ____________ 49 *OXXCl^XclXIIlCvl « r* 1 a "i m o /"I -» T.TWo ai"_av* L. C ZT IIO^^>»>««>>«I»>«I«<««B«U-O t- B ^^^« B .«.«__.«.«____.«.«.«__.«.«.«_..«.«_..«« . .» . B «B «B .««>«B «B .«>«<->« -B _..«« -B « -B ^.«.«.«._._._. OO^ ^ Reclaimed-water quality----- ----------------------- - _______ 55 Effects of reclaimed-water use - -- ------- _________________ 57 Tijuana hydrologic subarea-------------------------- --------------------- 57 (j£OJ_ogy _ __ __________ _____ ^7 OOJL.I.S ovj o u. r x a c e \va L,er ox otreami x ow cnaracc.erxsL.xcs " " " " " " " " " " " - - - - - - - - - - - - __- _ ol. Surface-water quality--------------------- --------------------- 61 iQ ^£i£££ i < < < < ' < ~ < ~ ~ ~ « ~ ~ « « o^t Pacific Coastal Plain-------------------------------------------- 64 r* X X U- V X 3 J. Occurrence and movement-------------- --------- - _--- _ 55 w round water qua X i ty Qy /\x xuvi ax Historical water quality--- --- ----- -------- _________ 72 Present water quality- --------------- - ________________ 73 "WciiLcir use * ~~ ~~~ ~~~ ~~~ ~~-------B -----B -----» t' -. -. -. - -. /j Reclaimed-water quality----- ____--_----- __________ _____ 73 Effects of reclaimed-water use----------------------------------- 78 o LinuTiH j^y""""*"""*"""""""""""""""""""""""*" /o ILLUSTRATIONS [Plates are in pocket] Plate 1. Map showing generalized geology of the Mission hydrologic subarea, San Diego County, California 2. Map showing soil association in the Mission hydrologic subarea, San Diego County, California 3. Map showing generalized geology of the Santee hydrologic subarea, San Diego County, California 4. Map showing soil association in the Santee hydrologic subarea, San Diego County, California CONTENTS V Page Figures 1-3. Maps showing-- 1. Location of hydrologic subareas-------------------------- 4 2. Mean annual precipitation------- ----- _______ ___ 7 3. Location of gaging stations in or near the Mission hydrologic subarea- __________-.__-.___________---_-- IQ 4-6. Graphs showing: 4. Number of days with flow in the San Luis Key River at Monserate Narrows, near Bonsall, and at Oceanside ---- 11 5. Dissolved solids as a function of streamflow at Monserate Narrows and at Oceanside---------------- --- 14 6. Dissolved solids as a function of streamflow at Oceanside before and after the large-scale use of imported water for irrigation in the lower San Luis Key River drainage basin------------------------- ---- 15 7. Map showing thickness of the Mission alluvial aquifer-- ---- 18 8. Graph showing recharge to and discharge from the Mission alluvial aquifer and the San Luis Rey River---------- ---- 20 9. Hydrographs showing water levels for wells in the Mission alluvial aquifer------------------ ----- ________________ 21 10-14. Maps showing: 10. Water-level contours and depth to water in the Mission alluvial aquifer, spring 1958---- ---- ----- 22 11. Water-level contours and depth to water in the Mission alluvial aquifer, spring 1983----------------- 24 12. Changes in dissolved-solids concentration with time at selected wells in the Mission alluvial aquifer------------------------------------------- -- 28 13. Water quality in the Mission alluvial aquifer, spring 1983 --- 30 14. Location of gaging station and surface-water-quality sampling stations in the Santee hydrologic subarea---- 36 15-16. Graphs showing flow into and discharge from: 15. El Capitan Reservoir------------------- -- ----------- 37 16. San Vicente Reservoir---------------------------- ----- 38 17. Hydrographs showing water levels for wells in the Santee alluvial aquifer --------------- -- _______ ___________ 43 18-25. Maps showing-- 18. Water-level contours and depth to water in the Santee alluvial aquifer, spring 1959-------------- -- 44 19. Water-level contours and depth to water in the Santee alluvial aquifer, spring 1983------------------ 46 20. Water quality in the Santee alluvial aquifer, spring 1959----- - ---- -- - ------- 50 21. Location of wells which have yielded high concentrations of nitrate, Santee hydrologic subarea, 1959-83 -- 52 22. Water quality in the Santee alluvial aquifer, spring 1983------- - ---- -- 54 23. Generalized geology of the Tijuana hydrologic subarea--- 58 24. Soil association in the Tijuana hydrologic subarea------ 62 25. Location of gaging station and surface-water-quality sampling station in the Tijuana hydrologic subarea---- 64 26. Hydrographs showing water levels for wells in the Tijuana alluvial aquifer--------------- -------- - _____-.__-_--- 66 VI CONTENTS Page Figures 27-28. Maps showing water-level contours and depth to water in the Tijuana alluvial aquifer: 27. Spring 1961 - 68 28. Spring 1983 -- 70 29 Graph showing dissolved solids as a function of time for well 18S/2W-33L10 completed in partly consolidated sediments of the Tijuana hydrologic subarea------------ 72 30-31 Maps showing: 30. Changes in dissolved-solids concentrations and water type with time at selected wells in the Tijuana alluvial aquifer-------------------------- 74 31. Water quality in the Tijuana hydrologic subarea, 76 32-34, Maps showing location of wells sampled by the U.S. Geological Survey, autumn 1982 and spring 1983: 32. Mission alluvial aquifer-- ------- ________ 94 33. Santee hydrologic subarea -------- _______ 96 34. Tijuana hydrologic subarea----- ------- --- 98 TABLES Page Table 1. Summary of discharge data for the San Luis Key River-----------
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