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CALIFORNIA REGIONAL WATER QUALITY TOL BOARD • CENTRAL VALLEY REGION <br />3443 Routier Road, Suite A Phone: (916) 255-3000 <br />Sacramento, California 95827-3098 CALNET: 8-494-3000 <br />T0: Greg K. Vaughn <br />Senior Engineer <br />Waste Discharge/AST Unit <br />Gail Wiggett <br />Associate Engineering Geologist <br />Waste Discharge/AST Unit <br />DATE: 1 March 1995 SIGNATURE: <br />SUBJECT: TRACY LAND TREATMENT FACILITY: REVIEW OF SOIL SAMPLING <br />REPORT DATED DECEMBER 1994 <br />This memo reviews the soil sampling report submitted 21 December 1994 by Wright <br />Environmental Services on behalf of the City of Tracy. The report summarizes the results of <br />sampling of soils stored at the Tracy Land Treatment Facility, which is under Waste Discharge <br />Requirements Order 94-216. Mr. Paul Verma, the City's representative, was unavailable for a <br />month due to travel out of the country. Now that Mr. Verma has returned, the City wishes to <br />expedite removal of the soils to proposed reuse locations in the first and second weeks of March. <br />In our letter dated 3 October 1994, we requested the following sampling and analysis, based on <br />our review of their August and September 1994 sampling proposals: <br />Area A (cells 14 and 20): 2 samples total <br />Area B (cells 1, 7, 19): 7 samples total <br />Area C (cells 8,9): 4 samples total <br />2., In 1 ;2 IRIMIIIIIM Mi o7o7a r,, ol <br />GC/FID <br />•USEPjA&L_riL- <br />III IIIIIIIIIIIII �1111��II�IIIIJIIII;Iii ;j <br />W9,0411=17r <br />TOG, as above <br />"_1'11;M21== - <br />.. i I0 <br />The following discrepancies exist between the workplan proposed in August -September, 1994, the <br />agreed-upon plan as discussed in the 3 October 1994 letter, and the results and information <br />presented in the December sampling report (hereafter Report): <br />1. The workplan; as cited in the Report, stated that samples would be taken at depths of 18 <br />to 24 inches below surface. The Report states that they were taken at 8 to 16 inches. Depending <br />on the depth of the soil piles, this could make a difference in the results. The deeper portions of <br />the piles would be less exposed to aeration. <br />2. The sample locations as shown in Figure 1 do not correspond to the agreed-upon <br />locations in the 3 October 1994 letter, nor to the map presented in the workplan. The sample <br />