ARCHIVED REPORTS_XR0007567 - Laserfiche WebLink

Home Browse Search

simplified site plan of the property prior to demolition of the buildings and subsequent excavation work. REVIEW OF PRIOR WORK: After decommissioning the winery, Jam Thorpe Oil , Inc. , (JTO, ) was contracted to destroy the existing buildings & structures that remained can the property. Work began in 1987, and was essentially completed by the end of 1988. During the removal of a 15,404 gallon concrete bunker , (which had contained diesel fuel and/or Hunker fuel , ) soil contamination was discovered. Because of the possibility of groundwater contamination, several soil borings and three (3) monitoring wells were installed in March, 1988, around the area which had contained the bunker. Laboratory analysis revealed that BTEX & TPH--6 were below detection limits in all samples, but minor amounts of TPH as oil & grease, (EPA 418. 1 , ) were detected in some of the soil samples. Analysis of the water samples showed all tested substances were below detection limits. In July, 1988, Ford Construction Inc. & JTO purchased the property, and assumed liability for future clean up and site closure. In early 1989, additional spoil was removed from the site of the former concrete tank, resulting in a pat approxi- mately 160 ' X 180' X 45 ' deep, plus access ramps & erosional gullies. Plate V1" shows it 's approximate size 9 location. The excavation reached a maximum depth of about 45 'bgl ; it breached the wafter table, which at that time was about 39 ' bgl . Sloughing and erosion has refilled the pit to about 30 feet, and nater no longer is visible. Refer- to Exhibz t A, (SAR prepared by WJHj dated 2-1-1990, ) for a more detailed history of acts vi ti es. Subsequent reports by WJH concluded that all contaminated sail had been removed from the site, and the groundwater had not been impacted; refer to Fxhabxts 8 & E for copies o4 those reports. On July 23, 1990, the San Joaquin Co. Environmental Health Divisions stated that they agreed with WJH 's assessment. . " that groundwater has not been impacted and no significant contamina- tion remains in the vadose zone, " However, site closure could not be achieved eved unto 1 the removed spoil was either disposed of or satisfactorily remediated to acceptable levels. Refer to Exhibit E for a copy of that correspondence. The three monitoring wells were destroyed in September , 1990, under the supervision of Environmental Health Division personel . 3 v