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San Joaquin County DIRECTOR <br /> QA"'" Donna Heran, RENS <br /> o ' Environmental Health Department <br /> �. ' �,•OG ASSISTANT DIRECTOR <br /> r. 2 600 East Main Street Laurie Cotulla,REHS <br /> s „< Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • Carl Borgman,REHS <br /> Website: www.s ov.or /ehd Mike Huggins,RENS, RDI <br /> t r R a 19 g Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 ,teff Carruesco,REHS, RDi <br /> Kasey Foley, REHS <br /> July 29, 2008 <br /> John Pestana Q-Tip Trust <br /> Mr. Donald Peterson <br /> PO Box 672 <br /> Manteca, CA 95336 <br /> Subject: Former Reeve's Exxon RO#: 200 <br /> 2360 East Street CUF#: 3484 <br /> Tracy, CA 95376 Global ID#: T0607700490 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> the State Water Resources Control Board (SWRCB) Clean Up Fund's (CUF) Preliminary 5-Year <br /> Review Summary Report dated March 26, 2008 and the Additional Subsurface Investigation <br /> Report dated February 22, 2008 and the First Quarter Groundwater Monitoring and Sampling <br /> Report dated April 4, 2008, prepared by Ground Zero Analysis, Inc. for the subject site noted <br /> above and has the following comments. <br /> The CUF recommended that the site be considered for closure if soil vapor migration was <br /> assessed and determined safe. The EHD will consider closure after the following items are <br /> addressed. <br /> • The dissolved petroleum contamination in first groundwater is mostly laterally delineated <br /> (total petroleum hydrocarbons as gasoline were detected in the grab water samples from <br /> SB17 through S1320). The concentrations of contaminants are declining in the water <br /> samples from MW1 through MW3. An estimate of the total sorbed and dissolved mass <br /> and a rate of decline of the dissolved mass must be provided and used to estimate when <br /> the subsurface conditions can be expected to achieve background conditions. <br /> • The EHD was unable to find data to support that the vertical extent of the ground water <br /> plume has been investigated. Investigation of deeper groundwater is required. <br /> • An investigation for vapor intrusion from contamination in the soil and groundwater must <br /> be completed. <br /> • Issues of gross contamination and direct exposure of contamination remaining in the soil <br /> must be evaluated and discussed. The San Francisco Bay Regional Water Quality <br /> Control Board Environmental Screening Levels can be used in the evaluation of the soil <br /> contaminant levels. <br />