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Recycled Water Basin D 6561.4.003.01 <br /> Lathrop, California August 24, 2005 <br /> AUTHORIZATION REQUEST FOR WELL INSTALLATION AND Page 3 <br /> GROUNDWATER STUDY <br /> • The groundwater depth in the monitoring wells will be measured to calculate the number of <br /> well volumes required for purging. <br /> • Prior to sampling, monitoring wells will be purged a minimum of three well volumes using <br /> a 12-volt pump while monitoring for stabilization of groundwater parameters (oxidation- <br /> reduction potential,temperature,pH and electrical conductivity). <br /> • Groundwater samples will be collected using new plastic tubing and transferred to <br /> laboratory-provided sample containers having analyte-specific preservatives, as necessary. <br /> We will collect filtered and non-filtered groundwater samples depending on the analytes <br /> tested. <br /> • Filtered groundwater samples will be passed through a 0.45 micron filter in the field prior <br /> to filling the sample containers. <br /> • Samples will be stored on ice during transportation using a chain-of-custody record and <br /> submitted to an accredited analytical laboratory. <br /> Groundwater samples will be analyzed as follows: <br /> • pH <br /> • Total Dissolved Solids <br /> • Specific Conductance <br /> • Hardness <br /> • Standard Cations and Standard Anions <br /> • Dissolved metals (Aluminum, Barium, Boron, Iron, Chromium, Copper, Lead, nickel, <br /> Manganese,Thallium and Zinc) <br /> • Arsenic <br /> • Ammonia as N,Nitrate+Nitrite as N,Total Kjeldahl Nitrogen(TKN) and Nitrogen as N. <br /> • Bicarbonate Alkalinity, Carbonate Alkalinity,Hydroxide Alkalinity and Total Alkalinity <br /> • Bromoform,Bromochlororomethane, Chloroform, and Dibromochloromethane <br /> • Bromide,Fluoride, Orthophosphate <br /> • Total Coliform Organisms <br /> • Trihalomethanes <br /> • Methylene Blue Activated Substances(MBAS) <br /> Reports <br /> We will prepare an installation summary report in conjunction with the first quarterly groundwater <br /> monitoring report that will include the following: <br /> • A site plan showing the locations of monitoring wells and significant site features <br /> • Boring logs with soil lithologic descriptions and well construction details <br />