SITE INFORMATION AND CORRESPONDENCE_FILE 2

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I San Joaquin County Environmental Health Department DIRECTOR Linda Turkatte, REHS 1868 East Hazelton Avenue Stockton , California 95205-6232 PROGRAMCOORDREHS ? � NATORS { Robert McClellon, RENS ON - .. Jeff Carruesco, REHS, RDI Kasey Foley, REHS Website; wwwsjgovorg/ehd Rodney Estrada, REHS �IFOR Phone: (209) 468-3420 Adrienne Ellsaesser, RENS Fax: (209) 464-0138 April 23, 2015 Floyd Barnes 9477 Fountain Valley Stockton , CA 95209 Subject: Remedial Action Work Plan - Response Barnes Trucking 1817 Fresno Avenue Stockton, CA 95206 The San Joaquin County Environmental Health Department (EHD) has reviewed Remedial Action Work Plan (RAP), dated March 9 , 2015 , prepared and submitted by your consultant Stratus Environmental Inc. (Stratus) . RAP outlines a proposed implementation of a 4-month pilot test for ozone injection (OI) remediation at the subject site. Continuation of OI beyond 4 months may later be considered by the EHD . In RAP, Stratus proposes to: Advance four soil borings onsite utilizing 8-inch hollow stem augers to approximately 25 feet below surface grade (bsg) ; ® From each boring , collect soil samples at 5-foot intervals through the upper 15 feet of the boring , and at 2 . 5-foot intervals from 15 feet bsg to total depth of each boring . Selected samples will be submitted for analysis of gasoline range organics (GRO) , and benzene, toluene, ethylbenzene, and xylenes (BTEX) . A photoionization detector will be used to screen soil for volatile organic compounds and other pertinent geologic data will be recorded on a boring log ; ® Install an ozone injection well in each boring (OZ- 1 through 0Z-4) for injection of ozone into groundwater in the interval between 23 and 25 feet bsg ; ® Utilize a portable ozone injection (OI ) system for a period of four months , during which time groundwater samples from selected wells will be collected at six-week intervals and analyzed for GRO , BTEX and other chemicals as required by the Central Valley Regional Water Quality Control Board (CVRWQCB) ; and ® Visit the site approximately twice per month to conduct operation and maintenance and measure groundwater parameters from selected wells located near the OI area. The EHD received no comments from either the public or other interested parties during the 30-day comment period regarding the proposed OI at the subject site, which ended on April 16 , 2015 . The EHD approves the scope of work outlined in RAP , with the following conditions: ® As the 'hot' well AS-1 is screened in fine-grained soil , the EHD recommends installing one upgradient ozone injector screened approximately 22 to 25 feet bsg, completing the well in the fine-graded unit, taking care to avoid the underlying sandy unit;