ARCHIVED REPORTS XR0003529 - Laserfiche WebLink

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• San Joaquin County Public Health Services Environmental Health Division December 21, 1994 (94-47-8620) On December 10, 1994, Fugro personnel supervised the installation of recovery/monitoring well MW-1 (Figure 2) south of the tank basin Separate-phase product recovery, using a vacuum truck provided by Crosby and Overton of Oakland, California, began immediately upon installation of the well Approximately 400 gallons of product and water were recovered during the first six hours of pumping Ms Mary Meays of the SJCPHS/EHD was on site during the initial product recovery field work Product recovery, by either vacuum truck or hand-bailing, has continued daily since well installation On December 12, 1994, Fugro connected a Shell-owned VR Systems internal combustion engine (ICE) to MW-1 to begin hydrocarbon recovery by vapor extraction The San Joaquin County Air Pollution Control District authorized temporary emissions discharge from the ICE for a five day period On December 13, 1994, Fugro supervised the installation of a six-inch diameter, 20-foot deep, recovery well (RW-1) The well was installed just east of the tank basin at a slight angle to allow it to penetrate the basin backfill Up to 0 43 foot of separate-phase hydrocarbons has been measured in this well Well RW-1 was also manifolded to the ICE Fugro has performed bailing of separate-phase hydrocarbons from RW-1 daily since installation The ICE operated from Tuesday morning December 13 through Sunday morning December 18, 1994 During this period, an estimated 150 gallons or more of product were recovered by vapor extraction Hand-bailing from both wells has recovered an estimated total of 80 gallons of product The vacuum truck has removed approximately 750 gallons of product mixed with water Fugro has also reviewed files at the Department of Water Resources to locate water wells within a 2,000-foot radius of the site The results of the file review are shown on Figure 1 and Table 1 Proposed Scope of Work To assess the extent of the fuel release, Fugro proposes a three-phased approach to the investigation All fieldwork will be performed according to Fugro Standard Operating Procedures, which are included as Attachment I The following scope of work is proposed Phase 1 • Collect approximately 7 groundwater samples beneath the site using a HydroPunch® tool driven by a cone penetrometer rig (CPT) The proposed sampling locations are shown on Figure 2 The actual number of samples and locations will be determined by field observations and conditions The CPT rig is proposed for quicker sampling and gathering lithology information with minimal soil sampling Soil samples will be collected only from the CPT locations nearest the UST basin (CPT-1, CPT-2, CPT-3, and CPT-5) near the top of groundwater (approximately 14 feet below grade) 94478620 AWP -2-