WORK PLANS - Laserfiche WebLink

Home Browse Search

AZURE ENVIRONMENTAL September 10, 1998 Harlan Knoll San Joaquin County Public Health Services 304 East Weber Avenue Stockton, California 95202 RE: Workplan to Close Hydraulic Platform Bunker Former Manna Pro Facility, Stockton, California Dear Mr. Knoll: This letter presents a summary of proposed work activities to close a hydraulically actuated bulk truck emptying platform contained in a concrete-lined bunker ("platform bunker") at the former Manna Pro facility, 4004 South El Dorado Street in Stockton, California. The platform bunker was reportedly where trucks were unloaded of grain by raising the front end of a truck driven onto the platform. The portion of the platform bunker presently remaining at the Site includes a pair of hydraulic rams in the subsurface concrete-lined bunker. The bunker appears to be approximately 7-to 10-feet deep and is partially filled with oily water. The objective of this workplan is to remove the contents of the platform bunker and close the structure in accordance with San Joaquin County Public Health Services (SJCPHS) requirements. On July 30, 1998, a water sample was collected from the bunker and sent to a laboratory for analysis of total petroleum hydrocarbons as diesel (TPHd). As indicated in the attached laboratory certificate, the water sample was found to contain TPHd at a concentration of 13,000 mg/l. Platform Bunker Closure Workplan To close the platform bunker, fluids in the bunker and rinseate generated from pressure cleaning the walls of the bunker and hydraulic arms will be removed and contained on-site for characterization and proper disposal. It is estimated that approximately 6,000 gallons of oily water are present in the bunker. To evaluate options for bunker water disposal, Azure collected a water sample for additional chemical analysis on September 9, 1998. The water sample analysis results will be used to evaluate water disposal options, including permitting and discharge into the sanitary sewer system and off-site transport and disposal. Following removal of the bunker contents, the concrete walls will be inspected for holes or other defects. In the event that such defects are found, it is recommended that a soil sample be collected from soil in the vicinity of the defect and/or from beneath the bunker. Following removal of the bunker contents and steam cleaning, the bunker will be covered with plastic sheeting to prevent water from entering. 828 Mission Avenue, San Rafael, CA 94901 9 4151485-9740 Fax 4151485-6062