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0 Additional Groundwater and Agriculture Drain Monitoring Work Plan Residential Neighborhood G April 18,2005 Page 6 Table 1B: Agricultural Drain and Shallow Well Monitoring Sample Plan Type Methods Size'of Container Preservatives Holding Times Ammonia Nitrogen Grab 350.2 500mL plastic None(See note) 28 days with preservative- ASAP without preservative Nitrate Nitrogen Grab 300 1 Liter(combined with EC) g plastic or glass None 48 hours Total Nitrogen Grab 3513 28 days with preservative- g 500mL plastic None(See note) (TIIN+N) ASAP without preservative Electrical Conductivity Grab 120.1 1 Liter(combined with Nitrate) None 28 days plastic or glass y Total Coliform Organism Grab 9221B 125mL None 6 hours BOD Grab 5210B 1 Liter None 48 hours Note:If sample is not analyzed promptly,the sample must be preserved with H,SO4. 5.0 ADDITIONAL AGRICULTURAL DRAIN MONITORING 5.1 AGRICULTURAL DRAIN MONITORING LOCATION IDENTIFICATION Two down-gradient and three up-gradient agricultural drain monitoring points are shown on Figure;3. Down-gradient locations are located east of the Kelso Road Berm, where the irrigation drainage enters valved culverts to flow under the Kelso Road Berm into an irrigation drainage ditch west of the Kelso Road Berm(18A and 19A). Upstream agricultural drain samples will be taken as close to the identified locations (15A, 16A and 17A) as possible based on available water in the drains. If insufficient water exists in the drains at the proposed locations, the sample technicians will move downstream(north) until sufficient water is available, even if this is within the reclamation area. Sampling documentation will note the actual location of the upstream sample when that location varies from the mapped location. 5.2 SAMPLING FREQUENCY Agricultural drain monitoring points will be sampled monthly during the first year. Following the first year of sampling the agricultural drain monitoring points will be sampled quarterly. The sampling events_ will be coordinated with and conducted at the same time as the sampling of the agricultural drain monitoring points for the two existing reclamation areas. 5.3 SAMPLING PROCEDURES All sampling equipment will be cleaned prior to use by washing in a solution of laboratory-grade, non- phosphate detergent and deionized water, wiping with isopropyl alcohol, and double-rinsing with deionized water. Water samples will be collected from the ditch sampling locations by filling a Teflon dipping cup and transferring the water to laboratory-supplied containers. The sample containers will be labeled, placed in a cooler chilled with ice, and delivered in accordance with chain-of-custody procedures to a certified laboratory. es +', CONDOR