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276 WATER RESOURCE. OF MOBELUMNE AREA, CALIFORNIA <br /> < " tions in annual withdrawals. They are significant, however, in show- <br /> ,'k ing that there was only a small recharge in the winter of 1928—,29, <br /> when the rainfall was light. <br /> DEEP-WELL RECORDS AND WELL LOGS <br /> Several deep wells have been drilled in the Mokelumne area in <br /> the last few years to obtain large supplies of water or in search of <br />` gas and oil. The logs of these ]toles are the only records available <br /> r of what exists Heep below the surface in this area; hence an effort <br /> was made to obtain as many of them as possible. <br /> wars 3N^r.s a.,R.r E. <br /> , . <br /> Driller's lo�gf well 8718A8 <br /> Walker,owner] <br /> Thick Depth Thick Depth <br /> (feet) (tAet7 ( (feet) <br /> Soil and Sand---------------------- 15 18Lgand -------______--------__ 2 105 <br /> Clay— =5 20 - - 2 107 <br /> Sandand gravel -- 30 ------`-`----`--_..i_i_ 3 110 <br /> Roft SA44 aAd_c1@ ______ _________ 10 Ot --------_-__--------_-_- 2 122 <br /> ? l - - 3pp dsand_---_--_-_�.._._� 4 12---------------------- -- - 14 140 <br /> $djb6andd clay---------------- 22 g4ater---_---------_�..., 10 150 <br />• Hard clay - '9 103 <br /> wELLs iN'r.414.,R. 5 E. <br /> Driller's log of well 4517J1 <br /> r Thick- Depth Thick- Depth <br /> r (�� (feet) (f� (feet) <br /> Peat------------------------------- 10 10 Black sand------------------------ 8 358 <br /> Sand------------------------------ 8 18 Sand and gravel------------------- 27 385 <br /> blue lay---------------------- 27 #6ementedsand-------------------- 5 390 <br /> St lit blue clay _ 10 56 lue clay_________________________' 15 405 <br /> Soft sandy blue clay_______________ 15 74) Packed sand_______________________ 9 414 <br /> d 11 -6 play, Cgumbo)________________ 10 80 Blue soapstone clay________________ 8 417 <br /> ;f Soft sandy clay-------------------- 20 100 Sand------------------------------ 41 458 <br /> r., 487 <br /> Fine sand(would not stand)______ 10 110 Gravel and sand___________________ 9 <br /> neglay,;llttla sand-------------- 84 194 Clay------------------------------ 5 472 <br /> erd oemeiited s'ah$______________ 7 201 Sand------------------------------ 32 504 <br /> ne-aft¢coarsb gravel_____________ 15 216 Gravel----------------------------- <br /> 7 511 <br /> be clay_---`-------------------- 64 280 Hard clay------------------------- 19 530 <br /> JR Cetnen�ed sand-------------------- 10 290 Joint clay-------------------------- 10 540 <br /> Mue'san$________________________ 60 350 Blue clay;sand at bottom_-______J 14 654 <br /> Driller's log of well 4519Ji <br /> [Libby,McNeill&Libby,owners] <br /> Thick- Depth Thick- Depth <br /> ness Bess (feet) <br /> (teat) ([est) (feet) <br /> Soil1 1 Dry nd-------------------------- 5 35 <br /> Peat------------------------------- 4 5 Blue clsaay---------------------------------215566+ <br /> Msoft clay--------------------------- 15 20 Water sand------------------------ <br /> ue clay-------------------------- 10 30 <br />