SITE INFORMATION AND CORRESPONDENCE_CASE 2

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MONITORING AND REPORTING PR-wdRAM NO. R5-2007-_ 'AMO 4 CITY OF TRACY AND LEPRINO FOODS COMPANY LAND DISCHARGE UNITS OF THE TRACY WASTEWATER TREATMENT PLANT SAN JOAQUIN COUNTY The Discharger shall monitor the groundwater at monitoring locations MW-2, MW-3, MW-4, and MW-5 as follows. Prior to sampling, the groundwater elevations shall be measured and the wells shall be purged of at least three well volumes until temperature, pH, and electrical conductivity have stabilized. Depth to groundwater shall be measured to the nearest 0.01 feet. Water table elevations shall be calculated and used to determine groundwater gradient and direction of flow. Samples shall be collected using standard USEPA methods. Groundwater monitoring shall include, at minimum, the following: Parameter Units Sample Type Minimum Sampling/Reporting Frequency Groundwater ElevationFeet Measurement 1/quarter Depth to Groundwater 0.01 Feet Measurement 1/quarter Gradient FeeVfeet calculated 1/quarter Gradient Direction degrees calculated 1/quarter pH Standard Grab 1/quarter Units Total Dissolved Solids mg/L Grab 1/quarter Volatile Dissolved Solids mg/L Grab 1/quarter Electrical Conductivity @ 25°C' pmhos/cm Grab 1/quarter Total Kjeldahl nitrogen mg/L Grab 1/quarter Nitrate (as N) mg/L Grab 1/quarter Total Coliform Organisms MPN/100 ml Grab 1/quarter Standard Minerals mg/L Grab 1/quarter Title 22 Metals mg/L Grab 1/year Groundwater elevation shall be used to calculate the direction and gradient of groundwater flow. Elevations shall be measured to the nearest one-hundredth of a foot from mean sea level, from a surveyed measuring point elevation on the well. The groundwater elevation shall be measured prior to purging the wells. P Standard Minerals shall include the following: boron, calcium, iron, magnesium, potassium, sodium, chloride, manganese, phosphorus, total alkalinity (including alkalinity series), and hardness. 3 Title 22 metals shall include the analyses of arsenic, cadmium, chromium, copper, lead, mercury, nickel, and zinc. BIOSOLIDS MONITORING 1. A composite sample of biosolids shall be collected annually prior to final disposal in accordance with EPA's POTW Sludge Sampling and Analysis Guidance Document, August 1989, and tested for priority pollutants listed in 40 CFR section 122 Appendix D, Tables II and III (excluding total phenols). Monitoring Location B-001 is not specifically defined in this Order. The biosolids sample shall be collected at a location prior to leaving the Facility for final disposal.