Laserfiche WebLink
1 • � <br /> 1 After well development, the groundwater monitoring wells will be sampled. Prior to sampling, <br /> all wells will be opened to allow equilibrium of fluid levels. Fluid levels in the wells will then be <br /> 1 measured to the nearest 0.01 foot, using an electronic sounder. The wells will be purged of five <br /> casing volumes of groundwater and until stabilization of pH, specific conductance and <br /> 1 temperature parameters is achieved. Groundwater samples will then be collected from the wells <br /> in accordance with the appropriate regulatory requirements. Purged water will be stored on site <br /> 1 in United Nations approved 55-gallon drums, pending laboratory analysis to evaluate disposal <br /> alternatives. <br /> 1 All monitoring wells will be surveyed by a licensed land surveyor, with respect to an established <br /> 1 benchmark located on West Washington Street near the Port of Stockton offices. Horizonal <br /> locations will be to the nearest 1.0 foot and elevations will be measured to 0.01 foot. A copy of <br /> 1 the surveyor's report will be included in the report. <br /> 1 The five existing wells will be sampled at the time the new wells are sampled. Including the <br /> existing wells, nine groundwater samples will be collected and analyzed for pesticides,nitrate, <br /> and ammonia. Four of the water samples will be analyzed for herbicides. Wells MW-1, MW-5, <br /> 1 and the four closest surrounding wells will also be analyzed for petroleum hydrocarbons. <br /> 1 The soil and groundwater sampling program proposed for the new wells is summarized in <br /> Table 5. This program will include the following methods and quantities: <br /> 1 Methods Number of soil Number of water <br /> 1 EPA 602 M - expanded BTEX 0 6 <br /> • EPA 8015 M - TPH-Gas 0 6 <br /> 1 EPA 8015 M - TPH-Diesel 0 6 <br /> • EPA 608 - organochlorine pesticides 0 9 <br /> 1 EPA 619 -triazine pesticides 0 9 <br /> • EPA 615 - herbicides 0 4 <br /> • EPA 300.0 -nitrate as Nitrogen 2 9 <br /> 1 EPA 350.2 - ammonia as Nitrogen 1 9 <br /> 1 <br /> 1 8 <br /> 1 <br />