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�r Mr Jeff Wong Page 2 of 5 . The waste is being managed pursuant to 49 CFR part 172 and 40 CFR part 262 Table 1 summarizes product thickness measurements and volumes removed Field notes are included in Attachment A 2.2 Monitoring Well Survey As required by AB 2886, all monitoring wells were surveyed by a Registered Surveyor to a horizontal accuracy of less than one meter and a vertical accuracy of 0 01 feet In January 2002, Morrow Surveying surveyed the latitude and longitude of the site wells relative to North American Datum (NAD83) Wellhead elevations were surveyed relative to San Joaquin County benchmark ERM 237 A site map showing monitoring well locations, latitude and longitude coordinates as well as wellhead elevations is included in Attachment B 2.3 Sampling the Domestic Water Supply Well A new water supply well was placed into service in early February 2002 after passing required water quality tests and receiving approval from the San Joaquin County Environmental Health Department (EHD) On February 4, 2002, a Ground Zero technician monitored depth to water in the old water supply well and collected groundwater samples at depths of 90 feet below ground surface (bgs) and 200 feet bgs using a bomb sampler The samples were transported to Argon Laboratories (FLAP #2359) under chain of custody Field notes are contained in Attachment A The old well was subsequently destroyed by Clark Well Inc pursuant to the workplan approved by Ms Adrienne Ellsaesser of EHD Ms Ellsaesser and Mr Willie Ng of EHD were present during destruction activities 2 4 Purgewater Disposal On March 15, 2002, American Valley Waste Oil removed and transported approximately 250 gallons of wastewater that was previously stored in drums at the site to Seaport Environmental in Redwood City for disposal Documentation of disposal is included in Attachment C 2 5 Groundwater Monitoring and Sampling On March 20 and 21, 2002, a Ground Zero technician monitored water levels in wells MW 1 through MW9B, and sampled monitoring wells MW2 through MW9B No sample was collected from well MW1 due to the presence of free product Groundwater elevations were calculated by measuring the depth to groundwater in each well and subtracting the measured depth from the respective well head elevation The measured depth to groundwater at the site ranged from 60 63 feet(MW I)to 6141 feet(MW5)below the tops of the well casings Groundwater elevations at the site ranged from 28 77 feet (MW2) to 28 96 feet (MW9B) below mean sea level (MSL) Groundwater levels in shallow monitoring wells MW1 through MW8 • rose an average of 125 feet between November 2001 and March 2002 Groundwater levels in well MW913, which was completed in a deeper aquifer, rose 129 feet during the same period G\Data\GROUNDZE\TULEBURG\Repo is\QMR\1QM2062 doc