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2024 ANNUAL GROUNDWATER MONITORING REPORT
<br /> TEICHERT AGGREGATES AND GRANITE CONSTRUCTION
<br /> VERNALIS AREA
<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 (LSCE, 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.
<br /> Blewitt Domestic is used in place of Koster. Data from South Tracy#1, South Tracy 9054, and
<br /> Granite#3 are available to supplement data for 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 and/or Granite#4 are used in
<br /> place of Granite#3. Groundwater quality laboratory analyses shall consist of the same
<br /> constituents listed above for Teichert's compliance monitoring activities minus nitrite,
<br /> fluoride, total hardness, and bacteriological analyses.
<br /> 3 SAMPLING PROCEDURES
<br /> Prior to the wells' annual sampling, depth-to-water measurements are obtained in relation to the wells'
<br /> surveyed reference points, i.e.,the top of the well casings, by lowering an electrical sounder in the well
<br /> casing following the manufacturer's guidelines. Field staff double-checks readings and records
<br /> measurements to the nearest 0.01 foot. Beginning in May 2024,wells that have had entanglement
<br /> issues or blockages inside the well have had water levels measured with an acoustic sounder. All
<br /> elevations are given in reference to the National Geodetic Vertical Datum of 1929, i.e., the mean sea
<br /> level datum (msl). It is noted on the field sheet,whether the well was pumping at arrival.
<br /> Wells are purged until indicator parameters (temperature, pH, and electrical conductivity) have
<br /> stabilized prior to sample retrieval. Stabilization is defined as consecutive readings where parameters do
<br /> not vary by more than 5 percent. Visual (color, occurrence of solids),olfactory (odor) and other
<br /> observations (e.g., wellhead conditions, well access,ground conditions, weather) are noted as
<br /> appropriate.The following instrumentation is used by LSCE staff:
<br /> • Depth to water:Solinst and/or Powers electrical sounder(Water Level Indicator),Eno
<br /> Scientific 2010 Pro Acoustic Sounder(Water Level Indicator)
<br /> • pH,temperature, electrical conductivity (EC), dissolved oxygen (DO), oxygen reduction
<br /> potential (ORP),total dissolved solids (TDS): YSI Pro DSS instrumentation
<br /> LUHDORFF He SCALMANINI
<br /> CONSULTING ENGINEERS 4
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