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010 i Groundwater Sam P!ing The monitoring wells will be purged using calculated well volumes based upon the depth to water in each casing. Depth to groundwater measurements will be made to the nearest one-one hundredth of one foot, and also checked for the presence of separate phase product. The well will be purged to remove stagnant water in the well casing. As each purge volume is removed, measurements of pH, electrical conductivity and temperature will be taken until these parameters stabilize over two purge volume removals, which is f interpreted to be aquifer water entering the casing. The well will be allowed to recover to about 80% of the initially measured water level, after which the sample will be collected. The water samples will be carefully collected with a clean bailer and poured into the appropriate laboratory prepared container with minimum cavitations. The water sample will be labeled, logged onto a chain-of-custody form, and, placed in a chilled ice chest. Upon completion of well sampling; the well will be closed and locked. Water Well Sampling 'I } Domestic water for the lavatories is obtained through an agreement with Calaveras Cement from the property owners to the west, which has an industrial well used in concrete batch operations. Wright's scope of work included a collection of water samples from the Calaveras Cement well (Water Well), located at 8181 11th Street (just east of i the M&M building). It is our understanding that this well is not used for drinking water at this time. Il Water Well sampling will use the faucet near the wellheadYjand the existing pump in the well. The water sample will be collected after first clearing the faucet for thirty seconds, then filling the laboratory prepared containers container with minimum cavitations and headspace. The water sample will be labeled, logged onto a chain-of-custody form, and placed in a chilled ice chest on crushed ice. 1� , fk {{� a Chemical Analysis Up to fifteen soil samples and six groundwater samples will be analyzed at Chromalab, Inc. State certified analytical laboratory from the exploratory, borings. These samples will be tested for the following; Total Petroleum Hydrocarbons as Gasoline (TPHG) and Diesel (TPHD), Benzene (B), Toluene (T), Ethyl benzene I(E) and Xylene (X), Methyl- tert-butyl-ether (MTBE) and fuel oxygenates, 1,2 Dichloroethane and Ethylene Dibromide using EPA Methods 3510/8015, 8020, and 8260. The analyses will be performed on a"normal" turnaround (five- to ten working days). Once installed, groundwater monitoring wells are anticipated to be sampled and would be analyzed for the same parameters as those previously discussed. Wright will review the F chemical parameters for quarterly monitoring with PHS-EHD prior to starting quarterly monitoring. r k