WORK PLANS - Laserfiche WebLink

Home Browse Search

Work Plan- Site Characterization II Page 7 Former Karlson Trucking Facility Project No. 191.2 December 6, 1999 reading will be recorded to an accuracy of 0.01 foot. Floating product and its thickness will also be noted if present. As each well is opened, and prior to taking the depth to groundwater measurement, a PID will be used to screen for VOC's in the head space of the well. Stagnant water in the well casing will be purged using a low flow volume purge pump. The rate of well purging will be noted and groundwater parameters measured, i.e., temperature, conductivity and pH, at the initiation of pumping and after purging each well volume to determine if water representative of formation is entering the well. It will be assumed that representative water is entering the well if the measured groundwater parameters are within 10% of each other for three consecutive parameter measurements. At a minimum, three well volumes will be pumped from each well. Before a sample is collected, the well's water level will be allowed to recharge to at least 80% of it's initial level. All water removed from the monitoring well and not used as a sample, will be placed in 55 gallon DOT (Department of Transportation 17-H) approved containers, properly labeled, and temporally stored on-site until arrangements can be made for its proper disposal. A clean stainless steel bailer will be used to collect each groundwater sample. Bailer cleanliness will be verified by collecting a bailer blank (pouring distilled water through the bailer and collecting it in a VOA vial) prior to collecting the analytical sample. Disposable gloves will be worn by the sampling technician while collecting all samples. The gloves will be changed between the collection of each sample to reduce the potential for cross- contamination. Water samples will be transferred from the bailer into unpreserved 1 liter amber glass bottles. Extreme care will be exercised during the collection of each sample to prevent agitation of the water contained in the bailer. All samples will be checked for head space bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory. A chain of custody document, listing all samples collected and their intended analyses, will accompany the samples from field to the laboratory, thereby providing a means to track their movement and insure their integrity. Samples will be shipped to Sherwood Labs (DHS# 1400), of Hilmar, California, for analysis. 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,Ca 95356 Fax: (209)569-0295