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CENTRAL VALLW REGIONAL WATER- QUALITONTROL BOARD 777777�- 29 April 1996 DISCHARGER: All Pure Chemical LOCATION & COUNTY: 26700 South Banta Road, San Joaquin County CONTACT(S): Verrill Norwood, Vice President, Pioneer Chlor Alkali Company and Tim Vickers, All Pure Chemical Plant Manager INSPECTION DATE: 20 March 1996 INSPECTED BY: Polly Lowry and Robert Reeves ACCOMPANIED BY: Tim Vickers OBSERVATIONS AND COMMENTS: On 30 March 1996, Robert Reeves and I met with Mr. Tim Vickers at the All Pure Chemical facility in Tracy. The purpose of the site visit was to collect water samples from the two supply wells at the All Pure facility and from Ponds 1 through 4 to confirm the January 1996 sample results. I also returned the videotapes of the two supply wells to Mr. Vickers. In addition to collecting samples from the two supply wells and four wastewater ponds, we also collected samples from a wastewater pond which receives water softener (Pond 5) and from two locations south of the fenced portion of the All Pure property where stormwater had collected on the unpaved ground surface. This area is on All Pure property. I had brought a camera to photograph our sampling locations and monitoring well locations. Mr. Vickers requested that I not take pictures until he got approval from Mr. Norwood. Mr. Vickers offered to take the pictures that we wanted himself and then send them to me, after obtaining Mr. Norwood's approval. I agreed to wait for Mr. Norwood's approval. The attached analytical results are summarized below. The sample identified as Pond-6 is a duplicate of the Pond-5 sample. The sample locations are shown on the attached map. The March 1996 results confirm the presence of carbon tetrachloride, chloroform and other trihalomethanes, and naphthalene detected in Ponds 1 and 2, and chloroform and other volatile organic compounds (VOCs) in Pond 4. Pond 3 only had a trace of chloroform in March, compared to 2.7 4g/1 in January. The sample from Pond 3 contained chlorobenzene and 2-chlorotoluene in January 1996, but not in March. Pond 5 had low levels of some trihalomethanes, including 9.3 µg/1 chloroform.