SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County Environmental Health Department OP C DIRECTOR Linda Turkatte, REHS Q a 1868 East Hazelton Avenue X Stockton California 95205-6232 PROGRAM COORDINATORS ' Robert McClellon,REHS Jeff Carruesco,REHS,RDI -�''P Website: www.sjgovorg/ehd Kasey Foley,REHS F o R Rodney Estrada, REHS Phone: (209)468-3420 Adrienne Ellsaesser, REFIS Fax: (209) 464-0138 June 2, 2015 Ms. Cyndi Ward Pilkington, NSG 500 E. Louise Avenue Lathrop CA 95320 Subject: Pilkington North America Facility 500 E. Louise Avenue Lathrop, CA 95330 Additional Investigation Required Dear Ms. Ward, The San Joaquin County Environmental Health Department (EHD) Site Mitigation Unit has reviewed an EHD site inspection report, photographs of sampling localities on a concrete pad, and laboratory analytical data for concrete and soil samples collected to assess the environmental condition of a former tiered permitted used oil treatment facility on the former Pilkington North America Facility at the address referenced above. A written report on the mitigation work on the former facility has not been submitted to the EHD; the following history has been prepared through this review of the documents cited above. Several other environmental conditions exist on the site, but this letter pertains only to the mitigation of the former tiered permitted used oil treatment facility. The concrete pad upon which the tiered permitted used oil treatment facility equipment was formerly located was photographed on 28 October 2014, and the copies provided to the EHD had the planned sampling localities for the surface concrete and shallow soil under the concrete identified; the points selected for sampling were the former locations of treatment equipment or where the concrete was cracked. Overall the concrete appears to have been in good condition in the photographs. The concrete and shallow soil beneath the concrete were sampled on 03 December 2014. The samples were sent to McCampbell Analytical, Inc., and were analyzed for motor oil by Method SW801513. Motor oil concentrations on the concrete samples ranged from 130 milligrams per kilogram (mg/kg) to 3,600 mg/kg and in the shallow soil samples from less than 5 mg/kg (the reporting limit) to 8,500 mg/kg, the latter concentration from sample WTP#3. After removal of the concrete, the former tiered permitted used oil treatment facility area was excavated to remove impacted soil; locally the excavation reached depths of 10 feet below surface grade (bsg). An EHD inspector was not present to observe the excavation work, but was present for the confirmation soil sampling. The inspector noted that petroleum odor was not observed and verbally communicated that the exposed soil exhibited no staining. The