PERMFILE49113

• Permit No: C1980005A
• IBM Index Class Name: Permit File
• Doc Date: 1/26/2005
• Section_Exhibit Name: Tab 7 Hydrology Part 3
• Media Type: D
• Archive: Yes

44 wells, but all of these are a case where the detection limit (50 to 400 ug/1, depending
upon analytical technique and interferences) exceeds the standard. The selenium standard
(20 ug/11 was exceeded at 2 wells for a total of 3 out of 42 samples. The maximum value
observed, however, was only 30 ug/1. The TDS standard (2000 mg/1) was exceeded at 25
wells for a total of 295 out of 423 samples. The sulfate standard (200 mg/1) was exceeded
at 34 wells. Generally, each sample from these wells exceeded the sulfate standard. In
conclusion, it should be noted that no ground water is bei no pumped ire the Seneca i; area
far irrigation.
3. Sui`ace Water
a. Total Dissolved Solids
TDS plots are provided for all stream and NPDES sites and Spoil Spring M1. Review of
these plots indicate stable or decreasing trends for sites currently being monitored at
surface water Sites 5, 11, 12, and 13. All other streams, along wlih all NPDES sites and
Spoil Spring M1, display increasing TDS trends.
b. Water Quality Standards
Table 7-114 compares surface water quality data to the livestock standards provided in
• Table 7-110. The aluminum standard of 5.0 mg/1 was exceeded a2 3 sites for a total of 10
out of 69 samples. These high aluminum values are a result of high suspended solids, of
which a major component is clay li.e., aluminum silicate mineralsl. The chromium standard
I50 ug/1) was exceeded at 2 sites for a total of 2 out of 35 samples. This low number of
occurrences indicates possible lab error. The pH standard (6.5-B.51 was exceeded at 15
sues for a Loral ~f 295 out of 2890 samples. However, only one rite, SW-52-5 ;SSLGS,
located abc:e n=nrng ca upper Li it_e Grassy L'r eek), hoc pH values above 9.0 and only two
spots se :nqs, r6 and •10 ISSSPGS anc SSS PG -. ~~;, had pH va'_ues below 5.5. The f:uc ride
standare (2_0 mg/11 was exceeded only once at eacn of twc sites. The mercury standard
(0.2 ug/11 was exceeded at 6 sites fcr a tota'_ of 7 out oI 153 samples. High detection
1_'mits, rel alive tc L-~e standard, niay influerme these exceed ences. The TDS standard (SOCC
me/1) was exceeded a: 2 sites for a total of S ou[ of 70 samples. The sulfate standard
13000 mg/ll was exceed ed at 2 sites fcr a tctz: of 6 out of 53 samples.
Table 7-115 compares surface water quality data to irn gation standards proaid ed in Table
7-ill. The aluminua, standard 15.0 mg/11 is the same as the livestock standard and,
therefore, expen enced the same number of exceed ences as discussed in the previous
paragraph. The chloride standard (100 mg/11 was exceeded at 2 sites for a total of 20 ou;
cf 196 samples. The chromium (100 ug/1) and copper (200 ug/1) standards were exceeded
or,'_y once, both at the same site and date. The pH standard (6.5-8.51 is the same as the
7-371 Revised 02/05/97