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2020 ANNUAL GROUNDWATER MONITORING REPORT
<br /> TEICHERT AGGREGATES AND GRANITE CONSTRUCTION
<br /> VERNALIS AREA
<br /> was incorporated into the monitoring program. Pressure readings were obtained in its airline and will be
<br /> converted to water level elevations once the setting of the airline is determined.
<br /> The groundwater quality network consists of 2 wells upgradient from the Vernalis plant(Hall and
<br /> Faulkner domestic wells), 1 well onsite (South Tracy#3 production well), and 2 downgradient wells
<br /> (Granite#5 and Brown's New production wells) (Figure 3).The monitoring network has experienced
<br /> modifications over time. For example,the South Tracy#3 production well was added to the water
<br /> quality network in 2004 in lieu of the Brown's New well, which became inoperable in 2001 (due to the
<br /> removal of the pump).With Granite's commencement of mining activities, the Brown's New well was
<br /> equipped with a pump again and was incorporated back into the monitoring program in 2009 as a
<br /> replacement for the South Tracy#1 well. Further,from 2006 to spring 2018,the Granite#3 well
<br /> replaced the Brown's#1 well for water quality monitoring purposes, as the Brown's#1 well was
<br /> vandalized in 2005. In 2019, Granite#3 was no longer in operation and was replaced with Granite#5 for
<br /> water quality monitoring purposes. From 1994 to 1997, the Koster irrigation well was sampled
<br /> periodically(depending on the availability of a tractor engine for the pump).
<br /> Samples from the water quality network wells are analyzed for electrical conductivity(EC), total
<br /> dissolved solids(TDS), pH,general minerals(calcium, magnesium, sodium, potassium, sulfate, chloride,
<br /> total alkalinity [including hydroxide, carbonate, and bicarbonate alkalinity], and total hardness), nitrate,
<br /> nitrite, fluoride, boron, and metals [copper, iron, manganese, and zinc]). Samples from the Hall and
<br /> Faulkner domestic wells are also analyzed for coliform bacteria (SM 9221B [15-tube] procedure with
<br /> fecal confirmation). Phosphorus sampling was discontinued in 1998.
<br /> Teichert's ongoing monitoring and reporting activities are inclusive of(and exceed)activities specified in
<br /> Granite's approved Groundwater Monitoring Plan (I-SCE, 2009). Specifically, Granite's approved
<br /> Groundwater Monitoring Plan includes:
<br /> 1. Semi-annual groundwater level measurements in five shallow wells (Hall, Rustan,Thoming,
<br /> Koster,4S/6E-5A1), one composite well (Petz), and four deep wells(South Tracy#3, Granite
<br /> #4, Brown's#1, Brown's New). Faulkner is used in place of the destroyed Thoming well. Data
<br /> from South Tracy#1, South Tracy 9054, and Granite#3 are available to supplement data for
<br /> South Tracy#3 and Granite#4.
<br /> 2. Semi-annual groundwater quality retrieval from one shallow well (Hall) and three deep wells
<br /> (South Tracy#3, Granite#3, and Brown's New). Granite#5 is used in place of Granite#3.
<br /> Groundwater quality laboratory analyses shall consist of the same constituents listed above
<br /> for Teichert's compliance monitoring activities minus nitrite, fluoride,total hardness, and
<br /> bacteriological analyses.
<br /> LUHDORFF&SCALMANINI
<br /> CONSULTING ENGINEERS 3
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