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Del Monte Foods— Research Center <br /> �--� 205iNorth Wiget Lane(94598-2458) <br /> P.O. Box 9004 <br /> Walnut Creek, CA 94598-0904 �� , ;^ ; ',•� <br /> Telephone: (510)944-7300 <br /> FAX: (510) 945-7453 r� /�/,, ipo <br /> Overnight Delivery <br /> September 9, 1998 <br /> Ronald Rowe <br /> LOP/Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Subject: Quarterly Monitoring Well Results—Del Monte Disco Site <br /> Dear Mr. Rowe: <br /> Attached are the last quarterly monitoring well results for the Disco site. All monitoring wells <br /> were sampled on July 23, 1998 except for the three NP wells,which were sampled on August 7, <br /> 1998. The samples collected on July 23, were sent to BSK Analytical Laboratories for BTEX <br /> analyses and to West Laboratory for oxygenate analysis. The NP samples collected on August 7 <br /> were sent to Sherwood Labs for BTEX analysis and Acculabs, Inc. for oxygenate analysis. <br /> Acculabs purchased West Labs, so the same laboratory did all the oxygenate analysis. <br /> As we saw last quarter, gasoline components were detected in only the wells near the former <br /> tank area. None of the oxygenates were found in any of the wells. <br /> We also found the groundwater rose slightly more than one foot since the last monitoring well <br /> sampling on May 20-21. Groundwater is now around 48 feet below ground surface. CH2M Hill <br /> will determine the groundwater gradient, which we will send to you shortly. <br /> If you have any questions about this information, give me a call. My phone number is 925-944- <br /> 7276. <br /> Sincerely, <br /> Richard Fish <br /> Environmental Manager <br />