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Kennedy/Jenks consultwats • Multi-parameter water quality meter(temperature, pH, specific conductance, redox potential) • Flow-through cell • Nitrocellulose filters (if conducting field filtering) • Sample containers (laboratory-supplied)with appropriate preservatives • Additional chemical preservatives (if necessary) • Watch or stopwatch • Sample labels, pens, field logbook, or other appropriate field forms (e.g., groundwater purge and sample forms, chain-of-custody forms), and access agreements and third-party sample receipts (if warranted) • Previous purging and sampling data for monitoring wells to be sampled, including water levels, purging parameters, and laboratory analysis results. • Monitoring well boring and construction log (including wellhead elevation survey and reference point information) • Personnel and equipment decontamination supplies • Sample shipping and packaging supplies • Personal protective equipment as specified in the Health and Safety Plan (HASP). 4.3 Typical Procedures for Monitoring Well Purging and Groundwater Sampling 1. Pre-Purging Data Collection and Purging Equipment Placement. Record the data and information collected during this procedure on a groundwater purge and sample form. Perform the following prior to groundwater sampling: a. Calibrate the multi-parameter water quality meter, prior to beginning sampling and as necessary based on field conditions, in accordance with the instructions in the manufacturer's operation manual. Note that it may be appropriate to keep a written log of the calibration procedures and an instrument maintenance with the instrument. b. Examine the monitoring well to be sampled and associated protective surface enclosure for any structural damage, poorly fitting caps, and leaks into the inner casing. If notable conditions exist, they should be recorded on the sampling log for the well so that any necessary follow-up corrective actions can be planned and implemented. c. Record an initial measurement of the depth to water. Calculate the volume of water in the well casing if wetted-casing-volume-based purging is to be used to remove the so-called "stagnant water"from the well prior to sampling. The volume of water in the wetted well casing should be calculated using the formula: V= (tC rZ) x L where r is one half of the inner diameter of the well casing/screen and L is the length of wetted casing/screen (calculated by subtracting the depth to water from the total well depth). Total well depth should not be measured at the start of a sampling event(due to the potential to cause turbidity). Measure the total well depth after sample collection. Note that some regulatory agencies require that the calculated "stagnant water" volume include the water contained in the pores space of the wetted portion of the monitoring well filter pack in addition to the casing/screen. If this is a requirement, it should be defined in the project-specific sampling requirements. Monitoring Well Replacement Work Plan, SOG 4 Sutter Home Lodi Winery, Lodi, California Page 2 of 7 gtis-•o�yledmin4bbN8,OB65W5.15 aMe,harwW9aq�afsMw irwO wpleppbsepti gwaomp w_