SITE INFORMATION AND CORRESPONDENCE

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r • • • Each sample will be logged on a chain-of-custody record that will also indicate the sample ID, date and time of collection and the sampler signature. • After the completion of sample collection, a laboratory provided custody seal will be placed on each sample container. • Containers will be placed into zip locked baggies to maintain a dry environment. • Sample containers will be placed into appropriately sized coolers equipped with foam inserts to prevent container breakage. The coolers will be equipped with blue ice or bagged ice to maintain a cooler temperature of 4 degrees Centigrade. The cooler will be maintained to prevent the accumulation of water and the entry of water into sample bags. Coolers will be hand-delivered to the laboratory for analysis. • Purge water will be discharged to land onsite. Analysis Methods The following is a summary of the analysis methods required for the North Lathrop Specific Plan sampling: Sampling Parameter Method of Sampling Container Holding Times Analysisr250mL e Preservative Ammonia EPA 350.2plastic Sulfuric Acid 28 da s Bicarbonate alkalinity, EPA 310.1/ plastic Unpreserved 14 days Hydroxide alkalinity, SM2320B Total alkalinity Chloride, Nitrate,Nitrite, EPA 300.0plastic Unpreserved 48 hours Phosphate, Sulfate, Bromide, Fluoride Methylene blue activated EPA 413.1 250 mL plastic Unpreserved 48 hours substances Sulfite EPA 351.3 250 mL plastic Unpreserved 24 hours Total dissolved solids EPA 160.1 250 mL plastic Unpreserved 7 days Total Kjeldahl nitrogen EPA 351.2 500 mL plastic Sulfuric Acid 28 days Total coliform organisms EPA 9221 250 mL plastic Unpreserved 6 hours Fecal coliform organisms EPA 9221 250 mL plastic Unpreserved 6 hours Trihalomethanes EPA (3)40 mL glass Hydrochloric 14 days 8260B Acid Aluminum,Barium,Boron, EPA 250 mL plastic Nitric Acid 6 months Calcium,Iron,Chromium, 6010B Copper,Lead,Manganese, Magnesium,Potassium, Sodium, and Zinc H, EC, temperature Parameters collected from field meter