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0 EN�RONMENTAL AUDIT, INC. <br /> 1000-A ORTEGA WAY -7 LACENTIA; A 92670-7125 <br /> 714/632-850k1! �74�fi4?�-6754 <br /> February 25, 1997 <br /> Project No. 1232 <br /> Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201-6229 <br /> RE: ANALYTICAL RESULTS FOR GROUND WATER FROM IRRIGATION WELL <br /> San Joaquin Delta College, Stockton, CA <br /> Dear Mr. Infurna: <br /> Enclosed are analytical results from the testing of ground water extracted from an irrigation <br /> well owned and operated by San Joaquin Delta College located near the southwest corner of <br /> the intersection of Pacific Avenue and Robinhood Drive. It should be noted that EAI could <br /> not follow standard protocol for ground water collection process due to limitations imposed by <br /> the physical configuration of the well. <br /> There are two significant points regarding the collection process. First, since a bailer or ump <br /> could not be inserted into the well, the well was turned on and water collected in a con ainer <br /> from water extracting at high pressure from the well. This extracted water was then <br /> transferred from the container into 40 ml VOA vials. Second, EAI does not have inforn Lation <br /> regarding the depth at which the dedicated pump (used to extract the ground water from the <br /> well) was located. Therefore, the extracted ground water may be derived from any depth <br /> within the screened interval of the well (40 feet to 407 feet below ground surface). <br /> A total of three ground water samples were collected as listed below: <br /> - DC-1@INT: The ground water sample collected immediately after the well was tlurned <br /> on. <br /> - DC-1@2: The ground water sample collected after two minutes of operation of the <br /> well. <br /> - DC-1@5: The ground water sample collected after five minutes of operation f the <br /> well. <br /> Each ground water sample was tested for total petroleum hydrocarbons as gasoline (TPH-G) <br /> by modified EPA Method 8015, and volatile organic compounds (VOCs) by EPA Method <br /> 8260. No TPH-G or VOCs were detected in any of the ground water samples (see at2ched <br /> laboratory reports). <br /> PLANNING,ENVIRONMENTAL ANALYSES AND <br /> HAZARDOUS SUBSTANCES MANAGEMENT AND REMEDIATION <br />