Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Inland Empire Per-
chlorate Ground Water Plume Assessment Act of 2009’’. 
SEC. 2. RIALTO-COLTON BASIN, CALIFORNIA, WATER RE-
SOURCES STUDY. 
(a) IN GENERAL.—Not later than 2 years after funds 
are made available to carry out this Act, the Secretary 
of the Interior, acting through the Director of the United 
States Geological Survey, shall complete a study of water 
resources in the Rialto-Colton Basin in the State of Cali-
fornia (in this section referred to as the ‘‘Basin’’), includ-
ing— 
(1) a survey of ground water resources in the 
Basin, including an analysis of— 
(A) the delineation, either horizontally or 
vertically, of the aquifers in the Basin, includ-
ing the quantity of water in the aquifers; 
(B) the availability of ground water re-
sources for human use; 
(C) the salinity of ground water resources; 
(D) the identification of a recent surge in 
perchlorate concentrations in ground water, 
whether significant sources are being flushed 
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through the vadose zone, or if perchlorate is 
being remobilized; 
(E) the identification of impacts and 
extents of all source areas that contribute to 
the regional plume to be fully characterized; 
(F) the potential of the ground water re-
sources to recharge; 
(G) the interaction between ground water 
and surface water; 
(H) the susceptibility of the aquifers to 
contamination, including identifying the extent 
of commingling of plume emanating within sur-
rounding areas in San Bernardino County, 
California; and 
(I) any other relevant criteria; and 
(2) a characterization of surface and bedrock 
geology of the Basin, including the effect of the geol-
ogy on ground water yield and quality. 
(b) COORDINATION.—The Secretary shall carry out 
the study in coordination with the State of California and 
any other entities that the Secretary determines to be ap-
propriate, including other Federal agencies and institu-
tions of higher education. 
(c) REPORT.—Upon completion of the study, the Sec-
retary shall submit to the Committee on Energy and Nat-
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ural Resources of the Senate and the Committee on Nat-
ural Resources of the House of Representatives a report 
that describes the results of the study. 
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Union Calendar No. 249 
111TH CONGRESS 
2D SESSION 
H. R. 4252 
[Report No. 111–433] 
A BILL 
To direct the Secretary of the Interior to conduct 
a study of water resources in the Rialto-Colton 
Basin in the State of California, and for other 
purposes. 
MARCH 11, 2010 
Committed to the Committee of the Whole House on the 
State of the Union and ordered to be printed 
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