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E..uxu G.SHowx Jx. � avEaxca ca .onx . Mnmmew ROOelOVV Water Boards 1oards ExwNONM6N1nL GPOtfC110N Central Valley Regional Water Quality Control Board 28 February 2017 MAR p 2 20v Jon Gamble CNV1R9,*Ei rAL Trinity Source Group, Inc. PERa;7-i F W SCTH 119 Encinal Street Santa Cruz, California 95060 REVIEW OF WASTE DELINEATION REPORT, RE-MANUFACTURING LTD, SAN JOAQUIN COUNTY The Central Valley Water Board (Water Board) regulates closure and post closure maintenance of an unlined surface impoundment at the former Re-Manufacturing LTD, Rental Machine Company under Waste Discharge Requirements Order 95-065. The property is owned by CCJS LLP (Discharger). Previous industrial activities conducted at the site included paint stripping and the discharge of liquid waste into an unlined surface impoundment. The Discharger previously performed remedial excavations of the closed surface impoundment in 2009 and 2010. However, the Discharger did not collect soil samples to confirm removal of contaminated soil from the surface impoundment. On 2 May 2016, the Discharger submitted a closure workplan. On 25 May 2016 staff approved the plan. The Discharger completed the field work and sample collection proposed in the plan and submitted the results in the 28 October 2016 Closed Surface Impoundment Waste Delineation Report. The Discharger used the investigation sample results to delineate the horizontal and vertical extent of residual lead in soil beneath and adjacent to the closed surface impoundment, develop a site conceptual model, and to calculate the potential threat from residual lead in soil to water quality using the designated level methodology. The report concluded that waste and impacted soil was sufficiently removed from the closed surface impoundment during previous remedial excavations, residual concentrations of lead in the soil at the site do not pose a threat to water quality, and that Order 95-065 should be rescinded. Staff has reviewed the data and analysis and concurs that the lead remaining in the soil does not pose a threat to water quality. Therefore, once we receive the following items, staff will issue a "No Further Action Letter" and recommend that our Permitting staff rescind Order 95-065 at the next available Board meeting. Please note that in order for the Regional Board to consider rescission of Order 95-065 at its 8/9 June 2017 meeting, all documents below should be submitted by 13 April 2017. 1. Documentation/hauling manifests that the residual stockpiled waste/soil has been removed and properly disposed of. 2. Photographic documentation that the excavation pit has been backfilled and compacted with clean soil to prevent ponding. KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. GREEDON P.E., BCEE, EXCOU71VC OfrICCR 11020 Sun Center Drive*200.Rancho Cordova,CA 85670 1 www.weterboarde.ca.gov/centralvalley RI neccfee.Wren