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January 13, 2005 NOA Project Number: E04070B Page 3 Cherry Hydrocoolers iThe two cherry hydrocooler lines are both located inside the building. The main cherry line is ! located in the main part of the building and the export line is located in a separate room adjacent to the south of the main cherry line. The main cherry hydrocooler's drain line is run to the adjacent export cherry room where it is combined with the drain from the cherry export hydrocooler drain prior to metering (see photo 6 and 7). I also observed the cherry hydrocoolers are metered with a SeaMetrics EX 80 Series electromagnetic flow sensor model number EX82P-50, serial number 11041468. This type of meter lacks moving parts and is designed to be installed in piping from 1 to :3 8 inches in diameter and thus is correctly-sized for this application's 4 inch PVC pipe. The critical installation dimension of 10x upstream and 5x downstream for,straight pipe have been met according to discussion with Lance Kagehiro of Morada Produce. Vertical installation is F1 implemented and allowed. This meter is connected to a counter that is attached via conduit to an electric source. F! H drocooler Chloride Neutralization Treatment Morada Produce is implementing a sodium thiosulfate neutralization treatment on each hydrocooler with confirmation testing prior to draining the hydrocoolers through the metering systems. Sodium thiosulfate has been selected due to soil analysis that showed a lower level of sodium than potassium in the adjacent walnut orchard where the pond water is used for irrigation. These soil analyses have been included in Appendix E. Based on observations and calculations provided for by Mr. Nick Gullo of Aqua Treat Chemicals, Fill Inc. of San Carlos, California, the appropriate volumes of chemicals were calculated to be added to the different volume hydrocoolers at their respective concentrations of free chlorine (in ppm). F1These calculations are included in Appendix F. The treated hydrocoolers will be circulated for 30 minutes and the chlorine levels will be read on the FMC controllers. Any measurable levels of free chlorine detected will result in a smaller additional treatment and an additional 30 minute circulation period. Once non-detect levels of chlorine are achieved, the results will he logged in a paper logbook with permanent pen, then the drains will be opened resulting in metering of the effluent. For example, on the Main Cherry Hydrocooler which has a 4,100 gallon capacity and assuming a concentration of 60 ppm free chlorine, approximately 12.7 pounds of sodium thiosulfate would be added and circulated for 30 minutes. If 2 ppm of chlorine were detected, then an additional 0.5 pound of chemical would be added and circulated for 30 additional minutes. If chlorine is not detected at the end of this period, then the drain would be manually opened which would result in F1metering at both the cherry hydrocooler drain meter and the 15 inch main wastewater pond meter. F1Conclusions. The wastewater pond inflow, supplemental irrigation water, asparagus and cherry hydrocoolers were observed to be individually metered using appropriate installation techniques. These meter systems T1 F1