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•STATE OF CALIFORNIA— ENVIRONMENTAL PRO ION AGENCY PETE WILSON Govem., CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- a CENTRAL VALLEY REGION 3443 ROUTIER ROAD, SUITE A SACRAMENTO, CA 95827-3098 PHONE: (916) 255-3000 FAX: (916) 255-3015 RECEIVED 19 November 1992 NOV 2 3 1992 ENVIRONMENTAL HEATH Mr. John Ewing PERM I° 00vloto Leprino Foods 1830 West 38th Avenue P.O. Box 173400 . Denver, CO 80217-3400 INITIAL GROUND WATER ASSESSMENT REPORT, LEPRINO FOODS, TRACY, SAN JOAQUIN COUNTY I have reviewed the 20 October 1992 report entitled "Initial Ground Water Assessment Report" submitted by Kleinfelder for the Leprino Foods (Leprino) site at 2401 MacArthur Drive in Tracy. The report is incomplete because it does not include the construction details of extraction well EW-1 and monitor- ing well MW-1. In addition, the consultant did not adhere to the sampling procedures described in the 15 July 1992 "Initial Ground Water Assessment Work Plan. " The assessment report does not provide information on the casing or screen material or on the size of the screen slots of EW-1 and MW-1. The report, also does not state the material used for the filter pack in these two wells. Procedures described in the 15 July 1992 work plan which were not followed include field screening of soil samples from thetwoborings, collecting ground water samples a minimum of 48 hours after developing EW-1 and MW-1 , and measuring water levels in EW-1 and MW-1 priory-to collecting ground water samples. In addition, EW-1 was not installed at the location proposed in the work plan. The work plan states ". . .borings will be drilled, logged and sampled following protocol in Appendix B, Sections B-2.1 through B-2.6. " Section B-2.2, Qualitative Field Screening, states "An organic vapor detector . . . is used to provide a qualitative screening of each soil sample collected from the borings. " Section B-2.3, Collection of Soil Samples, states "Soil samples are collected approximately every 5 feet for field screening and logging. " The text of the assessment report does not discuss any field screening conducted on the soil samples, nor are any organic vapor detector results shown in the logs of EW-1 or MW-1 in Appendix A. The report should include any field screening results on the soil samples. As stated in my 14 August 1992 letter, EW-1 and MW-1 . . will not be sampled until 48 hours after well development." Since the samples collected from EW-1 and MW-1 were collected only 24 hours after these two wells were developed, the samples may not be representative of the aquifer in the immediate area. Thus, additional samples need to be collected from these two wells. My 14 August 1992 letter also stated "Water level measurements will be taken in MW-1 , EW-1 , and the three Mobil Oil Company monitoring wells on the Leprino I I