| 1. | Map showing location and physical setting of the four ponds that form Lake Cochituate (South, Carling, Middle, and North), Natick public-supply wellfields, and the U.S. Army facility, Natick, Massachusetts |
| 2. | Ground-penetrating radar record and interpretation (line of section A-A'shown on pl. 1), South Pond of Lake Cochituate |
| 3. | Continuous seismic-reflection record and interpretation (line of section B-B' shown on pl. 1), South Pond of Lake Cochituate |
| 4. | Orthophotomap showing location of Natick Springvale public-supply wells, data-collection network, and selected observation wells and borings, South Pond of Lake Cochituate |
| 5. | Graph showing daily pumping rates for each active public-supply well—NCW1, NCW2, and NCW3-—and total daily pumping rate at the Natick Springvale wellfield from January 1998 to July 1999, South Pond of Lake Cochituate |
| 6. | Cross section showing lithology, public-supply wells, data-collection network and water levels on November 16, 1998 (line of section C-C' shown in fig. 4), South Pond of Lake Cochituate |
| 7. | Hydrograph showing stage of South Pond and water levels in pond-bottom piezometers, Lake Cochituate |
| 8-12. Graphs showing: | |
| 8. | (A) Temperature of South Pond adjacent to NCW83, (B) measured bihourly temperature profiles in NCW83 for the 24-hour period beginning at 2 p.m. September 18, 1998, and (C) simulated temperature envelopes for vertical flow rates of 0, 0.5, 1.0, 1.5 feet per day, Lake Cochituate |
| 9. | (A) Temperature of South Pond adjacent to NCW85, (B) measured bihourly temperature profiles in NCW85 for the 24-hour period beginning at 1 a.m. October 17, 1998, and (C) simulated temperature envelopes for vertical flow rates of 0, 0.5, 1.0 feet per day, Lake Cochituate |
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10. |
Temporal variation in delta oxygen-18 of pond water, ground water, water from observation wells between South Pond and Natick Springvale wellfield, and water from the public-supply wells, February 1998 to July 1999, Lake Cochituate |
| 11. | Relation between delta oxygen-18 and delta deuterium in pond water, ground water, and water from the public-supply wells, South Pond of Lake Cochituate, and the local meteoric water line for Concord, Massachusetts, 1998-99 |
| 12. | Mixing line based on a two-component mixing model using average isotope values for pond water, ground water, and water from the public-supply wells. Mixing-line result and uncertainty analysis indicate that 64 percent ±15 percent at the 95-percent confidence interval of water withdrawn at the Natick Springvale public-supply wells is derived from pond water |
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