Laserfiche WebLink
r <br />VII. GROUND -WATER MONITORING <br />Ground -water monitoring. <br />(a) Effective November 19, 1981, the owner or operator shall implement <br />a ground -water monitoring program which is capable of determining <br />the facility's impact on the quality of ground water in the upper- <br />most aquifer underlying the facility. A ground -water monitoring <br />system shall be part of the ground -water monitoring program. The <br />ground -water monitoring system shall be capable of yielding ground- <br />water samples for analysis, and shall consist of: <br />(1) Monitoring wells (at least one) installed hydraulically <br />upgradient (i.e., in the direction of increasing static <br />head) from the limit of the waste management area. <br />Their number, locations, and depths shall be sufficient <br />to yield ground -water samples that are: <br />(i) Representative of background ground -water quality <br />in the uppermost aquifer near the facility; and <br />(ii) Not affected by the facility; and <br />(2) Monitoring wells (at least three) installed hydraulically <br />downgradient (i.e., in the direction of decreasing static <br />head) at the limit of the waste management area. Their <br />number, locations, and depths shall ensure that they <br />immediately detect any statistically significant amounts <br />of hazardous waste or hazardous waste constituents that <br />migrate from the waste management area to the uppermost <br />aquifer. <br />(b) All monitoring wells shall be cased in a manner that maintains <br />the integrity of the monitoring well bore hole. This casing <br />shall be screened or perforated, and packed with gravel or <br />sand where necessary, to enable sample collection at depths <br />where appropriate aquifer flow zones exist. The annular space <br />(i.e., the space between the bore hole and well casing) above the <br />sampling depth shall be sealed with a suitable material (e.g., <br />cement grout or bentonite slurry) to prevent contamination of <br />samples and the ground water. <br />2. Sampling and analysis. <br />(a) The owner or operator shall obtain and analyze samples from the <br />installed groundwater monitoring system. The owner or operator <br />shall follow a ground -water sampling and analysis plan. The plan <br />shall be subject to approval by the California State Department <br />of Health Services and shall be kept at the facility. The plan <br />shall include procedures and techniques for: <br />