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Task 1.3 - Well Sampling: Groundwater samples will be collected from existing and newly constructed wells on a quarterly basis. Each monitoring well will be purged using calculated well volumes based on the depth to water in each casing. As each purge volume is removed, measurements of pH, temperature, and conductivity will be taken until these parameters stabilize, which is interpreted to beaquifer water entering the casing. Field testing of physical and biologic parameters will be conducted and collected immediately (i.e., dissolved oxygen, oxidation-reduction potential, pH, conductivity, temperature, alkalinity). Samples collected for chemical analysis will be carefully collected with a clean bailer and poured into the appropriate laboratory prepared container with minimum cavitation. Each water sample collected will be labeled, logged onto a chain-of-custody form, and placed in .a chilled ice chest. Upon completion of the well sampling, the well will be closed and locked and the sampler will move to the next sampling point. Samples will be analyzed by a state-certified analytical laboratory by the test methods described below in Task 1.4. Upon completion of field monitoring and analytical testing a report of findings will be prepared for submittal to the PHS-EHD, and the California State Water Resources Board (SWRCB). Task 1.4 - Chemical, Physical, and Biological Parameters Testing At least one soil core should be collected from within each of the two on site aquifer Iithofacies (one from the north side and one from the south side of the property) for permeability testing. The two values can then be averaged for identifying the groundwater flow rates. Up to two soil samples and four groundwater samples will be submitted for analysis for the following: TPH-G by EPA method 8015M • BTEX by EPA method 8020/602 Four groundwater samples will be analyzed in the laboratory (depending appropriate protocols and equipment available to the samplers) for the following: • Dissolved oxygen content either by down-hole meter reading or immediate surface measurement by the Winkler method. • Oxygen-reduction potential by method AB25880 (filled from the bottom, and analyzed immediately). • pH by EPA method 150.1, or SW-9040,or a direct reading meter. • Conductivity by EPA method 120.1 or SW-9050, or a direct reading meter. • Temperature by EPA method 170.1 (preferably by down-hole meter reading). • Alkalinity by Alkalinity test kit model AL Ap MGL, method A2320, or EPA method 310.2 • Nitrate by EPA method 353.2, or SW-9200, or HACH method 8039, 8192. ! • Sulfate by EPA method 353.2, or SW-9036/9038, or HACH method 8051. • Ferrous Iron by EPA method 200.7, or SW-6010, A3500, or HACH method 25140-25. • Biologic screening for assumed psuedomonas genera.