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UNION ICE COMPANY 1320 WEBER STREET STOCKTON, CALIFORNIA WORK PLAN TO INSTALL MONITORING WELLS .1.0 PROJECT IDENTIFICATION The Union Ice Company has requested that WHF Environmental Consultants Inc. install (3) three monitoring wells at the South and East sides of one of the cold storage warehouse on the site. This request is the result of a previous request by the California Regional Watef Quality Control Board to investigate a leak beneath the warehouse, of a salt water brine containing Chromic: acid. WHF proposes to install the wells to try and determine if the brine has impacted ground water at the site. 2.0 SITE DESCRIPTION ANIS HISTORY The Union Ice Company has been operating an ice manufacturing plant and cold storage facilities for nearly 100 years at this location. In 1988 four (4) under ground fuel tanks were removed and it was discovered that one of them had leaked. An ongoing investigation and remedial activities provide us with substantial information about the site including depth to ground water and ground water gradient inforalation. In 1992 WHF was performing a Phase I audit on the site and learned from the site's plant engineer that a leak of the chiller water had occurred beneath the building about 1.11, years previously. The engineer was not the plant engineer at that time and does not know how much of the brine leaked under the building. WHF recommended that Union Ice notify the RWQCB even though the leak occurred Several years previously, as the contaminant is a known carcinogen, and the depth to ground water is only fifteen (15) feet from the ground surface. Chromic acid in the brine solution would a:sc be highly mobile, even in the clays found at the site. Onion Ice agreed and WHF notified Mr. Cordon Boggs at the RWQCB in writing of the situation. WISE received a telephone call from the RWQCB rNuesting that an investigation of the leak be made and this work plan is the i esponse to that request.