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Civic Center Square Alk <br /> 2444 Main Street, Suite 215 A r <br /> Fresno, California 93 721-2 734 Citi�N�'1i� � �'i' HEALTH GEOMATRIX <br /> [209]264-2535 • FAX(209)264-7431 ' n a`�r71/In <br /> 20 April 1994 °l; "IPR 21 PM 2: 57 <br /> Project C2581 <br /> Mr. Steve Ascher, P. E. <br /> Schwan's Sales Enterprises, Inc. <br /> 3019 Scanlan Avenue <br /> Salina, Kansas 67401 <br /> Subject: Groundwater Monitoring Well Rehabilitation <br /> Manteca Depot, San Joaquin County, California <br /> Dear Mr. Ascher: <br /> Geomatrix Consultants, Inc. (Geomatrix) has completed the rehabilitation of groundwater <br /> monitoring wells at the Manteca Depot, 575 Industrial Park Drive, Manteca, San Joaquin County, <br /> California. The scope of work for this project was originally described in the Geomatrix <br /> 10 February 1994 letter to Schwan's Sales Enterprises, Inc. (Schwan's). In addition, Geomatrix <br /> also monitored the groundwater for the presence of floating hydrocarbons at the request of <br /> Schwan's, in response to a request by the San Joaquin County Environmental Health Division. <br /> This letter summarizes the results of our work. <br /> BACKGROUND <br /> Three groundwater monitoring wells were installed at the Manteca Depot (Figure 1) in 1991 by <br /> Treadwell & Rollo, Inc. for the previous property owner. Schwan's purchased the property in <br /> June 1993 and was informed of continuing groundwater monitoring requirements by the San <br /> Joaquin County Environmental Health Division. At the request of Schwan's, the wells were <br /> visually inspected by Geomatrix during a 9 February 1994 site visit. At that time, the three <br /> monitoring wells (MW-1, MW-2, and MW-3) were observed to have minor construction <br /> deficiencies (i.e. missing locks, damaged well casing) that could be rehabilitated for continued <br /> monitoring well service. Since Schwan's planned to regrade portions of the Manteca Depot to suit <br /> the needs of vehicle traffic, it was concluded that the wells should be completed flush with the <br /> anticipated ground surface. Geomatrix was retained to rehabilitate the monitoring wells and re- <br /> construct the well heads in underground vaults. <br /> Geomatrix Consultants, Inc. <br /> Engineers,Geologists,and Environmental Scientists �/ <br />