Ground-water hydrology and quality in the Lompoc area, Santa Barbara County, California, 1987-88

Abstract

Introduction 2 Purpose and scope 2 Description of the area 2 Acknowledgments 5 Well-numbering system 5 Geology 8 Lithologic units 8 Structural features 8 Groundwater hydrology 11 Definition of the aquifer system 11 Upper aquifer 11 Lower aquifer 11 Recharge 14 Discharge 19 Groundwater levels and movement 20 Seasonal changes 26 Long-term changes 29 Groundwater quality 30 Area! variation in groundwater quality 34 Upper aquifer 35 Shallow zone 35 Middle zone 38 Main zone 38 Lower aquifer 38 Vertical variation in groundwater quality 39 Stable-isotope chemistry 39 Distribution of stable isotopes and dissolved solids 40 Seasonal changes 44 Long-term changes 44 Upper aquifer 44 Shallow zone 44 Middle zone 45 Main zone 45 Lower aquifer 48 Conclusions 48 References cited 50 PLATE 1. Map showing generalized geology and geologic sections of the Lompoc area, Santa Barbara County, California In pocket Contents Conversion Factors and Vertical Datum V GROUNDWATER HYDROLOGY AND QUALITY IN THE