[Code of Federal Regulations]
[Title 40, Volume 25]
[Revised as of July 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR265.92]

[Page 533-534]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 265_INTERIM STATUS STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS 
WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES--Table of Contents
 
                    Subpart F_Ground-Water Monitoring
 
Sec. 265.92  Sampling and analysis.

    (a) The owner or operator must obtain and analyze samples from the 
installed ground-water monitoring system. The owner or operator must 
develop and follow a ground-water sampling and analysis plan. He must 
keep this plan at the facility. The plan must include procedures and 
techniques for:
    (1) Sample collection;
    (2) Sample preservation and shipment;
    (3) Analytical procedures; and
    (4) Chain of custody control.

[Comment: See ``Procedures Manual For Ground-water Monitoring At Solid 
Waste Disposal Facilities,'' EPA-530/SW-611, August 1977 and ``Methods 
for Chemical Analysis of Water and Wastes,'' EPA-600/4-79-020, March 
1979 for discussions of sampling and analysis procedures.]

    (b) The owner or operator must determine the concentration or value 
of the following parameters in ground-water samples in accordance with 
paragraphs (c) and (d) of this section:
    (1) Parameters characterizing the suitability of the ground water as 
a drinking water supply, as specified in appendix III.
    (2) Parameters establishing ground-water quality:
    (i) Chloride
    (ii) Iron
    (iii) Manganese
    (iv) Phenols
    (v) Sodium
    (vi) Sulfate

[Comment: These parameters are to be used as a basis for comparison in 
the event a ground-water quality assessment is required under Sec. 
265.93(d).]

    (3) Parameters used as indicators of ground-water contamination:
    (i) pH

[[Page 534]]

    (ii) Specific Conductance
    (iii) Total Organic Carbon
    (iv) Total Organic Halogen
    (c)(1) For all monitoring wells, the owner or operator must 
establish initial background concentrations or values of all parameters 
specified in paragraph (b) of this section. He must do this quarterly 
for one year.
    (2) For each of the indicator parameters specified in paragraph 
(b)(3) of this section, at least four replicate measurements must be 
obtained for each sample and the initial background arithmetic mean and 
variance must be determined by pooling the replicate measurements for 
the respective parameter concentrations or values in samples obtained 
from upgradient wells during the first year.
    (d) After the first year, all monitoring wells must be sampled and 
the samples analyzed with the following frequencies:
    (1) Samples collected to establish ground-water quality must be 
obtained and analyzed for the parameters specified in paragraph (b)(2) 
of this section at least annually.
    (2) Samples collected to indicate ground-water contamination must be 
obtained and analyzed for the parameters specified in paragraph (b)(3) 
of this section at least semi-annually.
    (e) Elevation of the ground-water surface at each monitoring well 
must be determined each time a sample is obtained.

[45 FR 33232, May 19, 1980, as amended at 50 FR 4514, Jan. 31, 1985]