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ground surface as often as required in a fashion which will not allow for runoff into surface water. Alternatively, a peristaltic pump using dedicated polypropylene tubing at each well may be used for purging and sampling. After purging,groundwater samples will be collected from the sampling device (bailer or peristaltic pump) directly into appropriate sample containers. All samples will be stored on ice and transported,under proper chain of custody,to the laboratory for analysis. It is anticipated that samples will be analyzed at Presicion Laboratory Inc.,Stockton, California. A log of gauging, purging and sampling activities will be completed for each well by the sampler,using a field report sheet similar to the one included in Appendix B. Quality assurance and quality control (QA/QC) samples (i.e., field blanks, trip blanks,laboratory blanks) are not anticipated for use during this project,but may be collected if the groundwater professional overseeing sampling activities determines a need for QA/QC sample analysis. Table 1:Anal cal Re uirements for Groundwater Samples Test Parameter DLR Unit Method Frequency H unit EPA 150.1 Quarterly Total Dissolved Solids 1.0 mg/Lmg/L EPA 160.1 Quarterly Nitrate as N 0.20 mg/Lmg/L EPA 300.0 Quarterly Total Kjeldahl Nitrogen 0.20 mg/Lmg/L EPA 351.2 Quarterly Total Alkalin 1.0 mg/Lmg/L EPA 310.1 Annuall Carbonate Alkalin 1.0 mg/ EPA 310.1 Annually Bicarbonate Alkalin 1.0 mg/ EPA 310.1 Annually Hydroxide Alkalin 1.0 mg/Lmg/L EPA 310.1 Annually Calcium 1.0. mg/Lmg/L EPA 200.7 Annually Chloride 1.0 mg/Lmg/L EPA 300.0 Annually Hardness as CaCO3 6.6 mg/L mg/LCalc. Annually Potassium 1.0 mg/Lmg/L EPA 200.7 Annually Magnesium 1.0 mg/ EPA 200.7 Annually Sodium 1.0. mg/Lmg/L EPA 200.7 Annually Sulfate as SO4 1.0 mg/Lmg/L EPA 300.0 Annually Boron 10ug/]_ EPA 200.7 Annually Iron 50 ug/4ug/4 EPA 200.7 Annually Notes: (1) Annual sample analysis will be conducted 2 weeks after well installation and during the last quarter of each year. (2) Sample containers include one plastic quart bottle per well. 6.0 Evaluation of Analytical Results Quarterly monitoring reports shall be submitted within 30 days after each groundwater sampling event. Those reports shall include all field sampling logs and laboratory analytical report sheets for the most recent monitoring event, a tabular times series presentation of cumulative monitoring data (well gauging and analytical results) for each constituent at each monitoring well, a narrative discussion of actual procedures used during the sampling event,maps showing the analytical results at 8