SITE INFORMATION AND CORRESPONDENCE

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DRAFT REVISED MONITORING AOREPORTING PROGRAM NO.96-813 • -2- LEPRINO FOODS COMPANY SAN JOAQUIN COUNTY used), and any wells installed subsequent to issuance of this MRP, shall include the list below. Monitoring wells with free-phase petroleum product or visible sheen shall be monitored for product thickness and depth to groundwater only. Monitoring of product presence in monitoring wells shall occur on a bi-weekly basis. If product is found in monitoring wells,product removal shall occur until no measurable product remains in the well. Sample collection and analysis shall follow standard EPA protocol. Analytical Maximum Sampling Constituent Method Detection Limit' Frequency Depth to water ---- ---- Quarterly Benzene 8020 or 8260 0.5 µg/1 Annually'3 Toluene 8020 or 8260 0.5 µg/1 Annually'3 Ethylbenzene 8020 or 8260 0.5 µg/1 Annually'3 Xylenes 8020 or 8260 0.5 µg/1 Annually'' Total Petroleum Hydrocarbons as diesel 8015M 50 µg/1 Quarterly 'For nondetectable results. 'Analyze only in MW-16,MW-17, and MW-18. 3 Annual sampling shall occur during the first quarter. RECOVERY SYSTEM MONITORING Five recovery wells are present at the site. Only two wells (RW-4a and RW-5a) are recovering product at this time. Leprino shall maintain recovery system data sheets, which shall include the information listed below. • Date and time of measurement; • Rate of the product/groundwater extraction [gallons per minute (gpm)], • Appearance and/or odor of extracted waters; • Cumulative groundwater/product extracted(if measurable); • Amount of product recovered (if measurable); • Condition of equipment; • System operational status, on-line or off-line (if off-line,provide explanation and schedule for restarting system). Recovery system data sheets shall be included in quarterly and annual groundwater monitoring reports.