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March 28, 1995 <br /> 92-1177102.34 <br /> NORCAL Waste Systems, Inc. <br /> Attention: - Mi. Larry.Sweetser, Director of-Regulatory- Affairs <br /> Subject: STATUS REPORT - Soil and Groundwater Remedial Activities- <br /> Stockton Scavenger Association: Facility <br /> 1240 Navy Drive <br /> Stockton, California <br /> i <br /> Page-2 <br /> The-groundwater treatment system consisted of a smgl`e groundwater extraction pump <br /> installed in well- MW-2.. The groundwater is pumped by the extraction pump. to a treatment <br /> system-.consisting of.a-particulate filter:and two stages of activated carbon The particulate filter <br /> removes solids which- would otherwise become trapped in the carbon absorbers, potentially <br /> shortening carbon life Two stages of activated arbon absorbers provide the necessary removal <br /> of-TPHs and'-BTEX. After passing through the activated carbon, the water is discharged into <br /> the-sewer- system. <br /> A sum-maty of groundwater analytical results is- presented in Table 1. Graphical <br /> concentration plots for constituents of-concern--in-monitoring wells MW-2 and MW-3 are shown <br /> ort-Figure 1 through= 4. Concentration plots for constituents of concern=in monitoring wells <br /> MW-I and MW-4 were not,_prepared because only_ a few-, detections were identified. <br /> _- Isoconce-ntmtion plots illustrating the distrubution of constitents. of concern are shown on <br /> Drawings 3 through S. As shown on these illustrations, petroleum--hydrocarbons detected in the <br /> groundwater are limited to the-area around monitoring-well MW-2. <br /> Based -upon the findings to date and the existing; site conditions, MARK recommends <br /> NORCAL seek site--closure with respect to soil and groundwater -conditions-. Further soil and <br /> groundwater- investigation of remediation is neither warranted nor recommendedw at this time. <br /> MARK appreciates this opportunity to be of continued service to NORCAL Waste <br />! _ - Systems, Inc. If you-have-.any questions, please call Mr. Robert S. Spare, Project Manager, or <br /> the=undersignedat (510) 946 1055. <br /> Sincerely, <br /> Th- MARK Group, Inc. <br /> Alan D. Gibbs, C.E.G. <br /> Associate <br /> ADG:RSS.:scd <br /> STATRPT.LTR <br /> Attachment: Soil Closure Report <br />