ARCHIVED REPORTS_XR0003278 - Laserfiche WebLink

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Harding Lawson Associates April 5, 1994 276901 San Joaquin County Mr Harlin Knoll Page 2 LEADED TANK (Site B) TPH 836 ppm 372 ppm Benzene 460 ppb ¢100 ppb Toluene 7430 ppb <150 ppb Xylene 46500 ppb 4030 ppb Tetraethyl Lead 300 ppm 1368 ppm The SJCEHD, acting as lead agency, requested HSC to over-excavate the tank sites to determine the condition of the soil and groundwater at each site Currently, Site A has been over-excavated to the groundwater table (approximately 11 feet below the ground surface (BGS) Contaminated soils were present to the groundwater table and contained up to 1,200 milligrams per kilogram (mg/kg) of TPH-G, and benzene, toluene, ethylbenzene, and xylenes (BTEX) at 26 mg/kg, 110 mg/kg, 34 mg/kg, and 160 mg/kg, respectively A sample of the groundwater collected from the Site A tank pit contained concentrations of TPH-G at 56 milligrams per liter (mg/1) and BTEX at 24,000 micrograms per liter . (ug/1), 19,000 ug/l, 2,400 ug/1, and 10,200 ug/l, respectively Soils from the excavation at Site A have been stockpiled and are currently being aerated Currently, no over-excavation work has been conducted at Site B The concrete oil storage bunker is located near the west side of the molasses tank and is bounded by railroad tracks to the west and the molasses storage tanks to the east (Plate 1) The 10,000 gallon concrete bunker was used to store No 6 fuel oil The top of the bunker has been removed and the inside has been steam cleaned Currently, the SJCEHD is requesting closure of the hunker The SJCEHD is requiring a closure plan be prepared by a Califorrua registered geologist and submitted for approval SJCEHD has requested testing of groundwater beneath and soils, in the vicinity, of the bunker SCOPE OF WORK HLAs proposed field investigation will evaluate the potential groundwater plumes and collect the confirmation samples at the concrete bunker as required by the SJCEHD The goal of the protect is to provide the necessary information for closure of the sites During all field work, procedures outlined in HI.A's site-specific Health and Safety Plan will be followed The Health and Safety Plan is intended to identify and mitigate the hazard exposure encountered by onsite personnel The plan will include provisions for site access control, worker training and medical monitoring requirements, worker personal protection, onsite and offsite monitoring, personnel decontamination, and contingency planning All personnel conducting activities at the site will be properly trained in their specific assigned work functions They will be familiar with the operation of equipment required for assigned tasks and will be capable of mitigating physical hazards associated with the operation of the equipment r�