SITE INFORMATION AND CORRESPONDENCE

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WASTE DISCHARGE REQU&MENTS NO.5-01-114 • -5- PILKINGTON NORTH AMERICA,INC. PILKINGTON GLASS FURNACE FACILITY SAN JOAQUIN COUNTY one foot of freeboard, the pond capacity is 1,000,000 gallons. Because 500,000 gallons of wastewater is maintained in the pond, the pond does not provide much storage capacity. 32. The pond was overfilled once and the wastewater was discharged to the surrounding area. Reportedly, the wastewater remained on-site. 33. Solids which accumulate in the concrete pond are removed approximately every two to four years. The solids are characterized prior to disposal in a licensed landfill. The pond is bypassed during this procedure. The Discharger may add chlorine to the storage pond to control algae growth. Adding chlorine results in additional wastewater and groundwater monitoring requirements. 34. A number of agricultural or industrial supply wells, groundwater monitoring wells, and groundwater extraction wells exist at the facility or within 100 feet of the existing and proposed application areas. Some of the wells are associated with the groundwater cleanup project at the former Occidental Chemical facility(now owned by J.R. Simplot). The well locations are presented on Attachment B. 35. A groundwater plume of 1,2-dibromo-3-chloropropane (DBCP) exists beneath the facility. The plume emanated from the Occidental Chemical Corporation facility located southeast of the Discharger's facility. Groundwater contamination by chemical compounds associated with fertilizers (nitrogen compounds and salts)have been identified at the J.R. Simplot Company facility which occupies the same location as the former Occidental Chemical Corporation site. The extent of the J.R. Simplot groundwater contamination has not been defined and may extend onto the Discharger's property. 36. The depth to groundwater and flow direction has been measured in on-site groundwater monitoring wells installed for a petroleum fuel leak investigation. The monitoring wells are screened in the first encountered water bearing zone. Groundwater exists approximately 11 feet below ground surface (bgs); groundwater flows to the northwest but may be locally influenced by dewatering activities at the cullet sump and by groundwater extraction wells operated by Occidental Chemical Corporation. 37. Water quality analysis of the shallow groundwater was performed during dewatering activities for the cullet tunnel construction in 1993. Total dissolved solids concentration was reported to be 3,735 mg/l and 4,720 mg/l. 38. Water used at the facility is supplied from three wells located approximately one mile from the site. The water quality of the supply wells was tested on 15 August 2000. The results of the chemical analysis of the samples is presented below: Constituent Units Well J Well K Well L Calcium mg/l 60 44 57 Chloride mg/l 12 19 13 Conductivity µmhos/cm 671 496 591 Hardness (CaCO3) mg/l 220 147 212 Magnesium mg/l 17 9 17 Nitrate (as NO3) mg/l 21.8 15.5 18.4