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<br /> Central Valley Regional !Nater Ouality Control Board
<br /> SPR
<br /> 6 April 2014
<br /> City of Tracy
<br /> Public Works Department
<br /> c/o Paul Verma
<br /> 333 Civic Center Plaza
<br /> Tracy, CA 95376
<br /> SECOND REVISED WORKPLAN REVIEW, CITY OF TRACY— CLASS H LAND TREATMENT
<br /> UNIT, SAN JOAQUIN COUNTY
<br /> The operation, monitoring, and closure requirements of the City of Tracy's (hereafter
<br /> Discharger) former Class II Land Treatment facility (Site) are prescribed by Waste Discharge
<br /> Requirements (WDRs) 94-216. The WDRs require an assessment of groundwater, and at
<br /> closure, the removal of all residual waste, covers, liner material, and adjacent geologic material
<br /> contaminated by waste.
<br /> Between 1994 and 2000, the City of Tracy took steps to clean close their Site, as required by
<br /> the WDRs. However, before the City received closure, new waste piles were disposed across
<br /> the Site, both atop and beyond the limits of the Site's former waste treatment units. The
<br /> Discharger estimates that about 9,500 cubic yards of waste remains atop the Site in
<br /> approximately 1,056 individual piles, each consisting of about nine cubic yards of waste.
<br /> To complete closure as required by the WDRs, the Discharger submitted the 14 February 2014
<br /> Second Revised Workplan Soil and Groundwater Site Assessment(Work Pan). The Work Pan
<br /> contains a proposal to establish background soil concentrations, and assess the nature of the
<br /> remaining waste piles, native soil beneath the piles, and groundwater beneath the Site.
<br /> To assess the nature of the waste piles remaining at the Site, the Work Pan contains a proposal
<br /> to collect 17 samples from about two feet into select waste piles. To assess the nature of native
<br /> soil beneath the waste piles, the Work Plan contains a proposal to advance seven soil borings
<br /> and to collect depth discreet samples from each boring at about 6, 18, and 30 inches below
<br /> ground surface (bgs). Each shallow (6” bgs) soil sample will be analyzed; however, analysis of
<br /> the deeper native soil samples will be contingent on the results of the shallower samples. To
<br /> assess background soil conditions, the Work Pan contains a proposal to advance two borings
<br /> outside of the known waste disposal area, and to collect depth discreet samples from each
<br /> boring at about 1, 2, and 3 feet below ground surface (bgs). To assess the nature of
<br /> groundwater beneath the Site, the Work Pan contains a proposal to advance five SimulProbe
<br /> borings and to collect soil and groundwater samples from each boring. Groundwater is
<br /> estimated to be at about 100 feet bgs, and each boring will be advanced to a maximum depth of
<br /> 120 feet bgs.
<br /> KARL E. LONGLEY SCD, P.E., CRAEn I PAMELA C. CREEDON P,E., SCEE,ExecuTwE or Raen
<br /> 11020 Sun Canret Drive 0200.Rancho Coroova,CA 25570 I wwv..wateroonraasa.0ovlcentralvan0y
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