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- - - t - a - - 1 516 6S5 914E - T GROUNDWATER TECH _ 10/` 2 15: 15- - 002 - T GROUNDWATER TECHNOLOGY, INC. 405;Fnr,C11icaguHig11wzjy,Cultcord.CA94520 4151 FA\:14151 M5-9148 October 8, 1992 Project No. 020 02819 Mr. Steve Schneider San Joaquin County Public Health Services 445 N. San Joaquin Street Stockton, CA 95201 RE: Manna Pro Facility 4004 S. EI Dorado, Stockton, California Addendum to Work Pian for Characterization and Remediation of Stockpiled Soils and Tank Pit Excavation Backfilling Dear Mr. Schneider: This letter serves to address the concerns you expressed to Mr. Dean Willis of Owelveney & Myers ect rk plan, dated on theegal e concunsel erns, wenwishoto clarify our)proposed scope oarding the f orkoand/or make the following changes: Based 1-.—rglarifigation of the Use of COMPASLIG SAMOt You requested clarification on the sampling regime proposed by Groundwater Technology on behalf of Manna Pro Corporation. The sampling regime proposed as a means of characterizing the stockpiled soil is to collect a discrete sample from the stockpiled soil for each 40 cubic yards. Four discrete samples from contiguous 40 cubic yard volumes of soil will be composited by the laboratory for analyses. The destination of each 160 cubic yard volume of soil represented by the composite sample (i.e., whether that soil is segregated for on-site treatment or returned to the tank excavation) will be tamed upon whether or not the composite sample meets the target criteria proposed in the work plan, as ammended by this addendum. 2. IFleld Obsoryatigns yo RIMadis"i 2t SR2ts" You requested that SJCPHS have the ability to require testing of discrete samples before they are compo$W if it appears, based on field observations, that they may exceed the target criteria, Accordingly, ff during the course of sampling, either visual inspection or field screening measures (i.e., photoionization detector headspace analyses) reveal concentrations of petroleum hydrocarbons that may exceed target criteria in a discrete sample, that sample, at SJCPHS's request, will be separately analyzed. If the sample meets target criteria, the 40 cubic yards of soli represented by 4 may be placed in the excavation or otherwise handled In accordance with paragraph 4 below. If the sample does not meet the target criteria, the soil represented by it will be segregated for further treatment in accordance with the work plan.