IIB 
111TH CONGRESS 
2D SESSION 
H. R. 4252 
IN THE SENATE OF THE UNITED STATES 
MARCH 19, 2010 
Received; read twice and referred to the Committee on Energy and Natural 
Resources 
AN ACT 
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. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
VerDate Nov 24 2008 
22:05 Mar 19, 2010
Jkt 089200
PO 00000
Frm 00001
Fmt 6652
Sfmt 6201
E:\BILLS\H4252.RFS
H4252
mstockstill on DSKH9S0YB1PROD with BILLS
HR 4252 RFS 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Inland Empire Per-
chlorate Ground Water Plume Assessment Act of 2010’’. 
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 
through the vadose zone, or if perchlorate is 
being remobilized; 
VerDate Nov 24 2008 
22:05 Mar 19, 2010
Jkt 089200
PO 00000
Frm 00002
Fmt 6652
Sfmt 6201
E:\BILLS\H4252.RFS
H4252
mstockstill on DSKH9S0YB1PROD with BILLS
HR 4252 RFS 
(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-
ural Resources of the Senate and the Committee on Nat-
VerDate Nov 24 2008 
22:05 Mar 19, 2010
Jkt 089200
PO 00000
Frm 00003
Fmt 6652
Sfmt 6201
E:\BILLS\H4252.RFS
H4252
mstockstill on DSKH9S0YB1PROD with BILLS
HR 4252 RFS 
ural Resources of the House of Representatives a report 
that describes the results of the study. 
Passed the House of Representatives March 18, 
2010. 
Attest: 
LORRAINE C. MILLER, 
Clerk. 
VerDate Nov 24 2008 
22:05 Mar 19, 2010
Jkt 089200
PO 00000
Frm 00004
Fmt 6652
Sfmt 6201
E:\BILLS\H4252.RFS
H4252
mstockstill on DSKH9S0YB1PROD with BILLS