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r MAP 12 '92 14:44 01," I 916:3715e2l ' P. 10 MONITORING WELL DEVELOPMENT. PROCEDMS Groundwater monitoring wells will be developed using hand operated bailers or submersible pumps. All well development equipment is cleaned by washing or steam cleaning prior to being used. Prior to beginning well development activities, the total depth of the well will be measured and compared to the designed total depth. A water sample collected at the free water surface will be collected using a clear Teflon bailer and visually inspected for the presence of free petroleum product. Using the measured level of water in the well, the volume of water in the well casing will be calculated. Well development begins by using a bailer of slightly smaller diameter than the monitoring well casing to gently surge and remove water from the well. The turbidity and quantity of sediment in the removed water will be constantly visually noted. As turbidity and sediment in the removed water will decrease, the rate of surging and removal of water from the well will increased. A minimum of ten casing volumes of water, as calculated in the field, will be removed from the well. Well development will be determined to be complete once water removed is observed to be free of sediment, turbidity is reduced to lowest levels and/or field mea-,urements of water pH, electrical conductivity, and temperature are consistent. All fluids generated by well development activities will be collected and placed into appropriate 55-gallon capacity drums. Disposal alternatives for the collected water will be determined on the basis of laboratory results of groundwater samples collected after well development. When appropriate, collected water will be disposed at the site. GROUNDWATER SAMPLING This document presents groundwater monitoring well sampling procedures. These procedures are for use at sites where only the presence of gasoline, diesel, or motor oil is of concern. These procedures are general sampling procedures, specific procedures for each site will be discussed with the project manager. G=ajj Sampliple Procedares 1. All chemical sampling, handling, and storage will be in accordance with U. S. ,Environmental Protection Agency and State of California State Water Resources Control Board guidelines. Regional Water Quality Control Board, County, and. City guidelines will also be checked prior to the initiation of any sampling project. 2. A written field log of all sampling activities will be maintained. 3. in the geld, all filled sample containers will be properly sealed, labeled and identified. Written on the label will be the date, the sampling time, a sample identification number, the name-of the sampler, and the project name. nan�z.ata A-3