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STATE OAF CALIFORNIA. Environmental Prote&Agency • PETE WILSON Governor <br /> f CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD �' <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> PHONE: (916) 255-3000 +''+ .�°'� <br /> FAX: (916) 255-3015 <br /> 29 January 1993 <br /> FEB A4 1393 <br /> ENVIRONMENTAL HEA1 TH <br /> Mr. John Ewing PERMIT/SERVICFa <br /> Leprino Foods <br /> 1830 West 38th Avenue <br /> P.O. Box 173400 <br /> Denver, CO 80217-3400 <br /> GROUND WATER INVESTIGATION AT LEPRINO FOODS, 2401 MACARTHUR DRIVE, TRACY, SAN <br /> JOAQUIN COUNTY <br /> I have received the 2 December 1992 letter from your consultant, Kleinfelder, <br /> in response to my 19 November 1992 letter commenting on the 20 October 1992 <br /> Initial Ground Water Assessment Report by Kleinfelder on the Leprino Foods <br /> facility in Tracy. The 2 December 1992 letter does not address all of the <br /> comments in my 19 November 1992 letter. Of major concern is the measurement <br /> of ground water levels and determination of the ground water flow direction. <br /> Kleinfelder's 2 December 1992 letter included a map showing water level <br /> measurements in Mobil monitoring wells AW-6, AW-7, and AW-8 on 21 October 1992 <br /> and in Leprino's EW-1 and MW-1 on 24 October 1992. In addition to contouring <br /> the ground water elevations, the data should be tabulated and included in the <br /> report. The table should include the depth to ground water (from the top of <br /> casing or some other established datum) , the elevation of the top of casing, <br /> product thickness (if applicable) , and the calculated ground water elevation, <br /> for both the Mobil monitoring wells and the Leprino wells. <br /> Kleinfelder's letter stated remediation would begin in mid-December without <br /> describing the remediation method or providing a remedial system design. In <br /> our 29 January 1993 telephone conversation, you told me that ground water will <br /> be extracted from EW-1 , treated in an existing bioremediation system, and <br /> discharged to the City of Tracy sewer system. You also stated the extraction <br /> and treatment will begin in a few weeks. By 19 February 1993, please submit a <br /> full description of this interim remediation system, including extraction <br /> rates and treatment method, and a schedule for system startup. <br /> Kleinfelder's letter stated Leprino monitoring wells EW-1 and MW-1 will be <br /> sampled monthly during the first quarter of remediation and quarterly thereaf- <br /> ter, but did not mention if water level measurements would be taken prior to <br /> sampling. Water levels shall be measured prior to each sampling event, <br /> recorded, and reported as described above, in tabular form and contoured when <br /> data from three monitoring wells are available. At least one of the three <br /> monthly water level meaurements shall be taken at the same time as the water <br /> level measurements in Mobil monitoring wells AW-6, AW-7, and AW-8. The <br /> measurements from that sampling event shall be contoured and tabulated. <br />