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City of Stockton A68101.02F July 24, 1997 Page 14 8.0 RECOMMENDATIONS ' • Groundwater monitoring well. MW-3 should be repaired or abandoned considering plans for soil remediation (below); ' • Future degradation of groundwater should be mitigated by remediation of PPC the impacted soils identified by this investigation. A work plan for soil remediation should be prepared including provisions for removing free PPC product from the water table, if encountered. • Additional groundwater assessment is needed to delimit the lateral extent of PPCs ' in groundwater and provide data to evaluate remedial alternatives for the PPC impacted groundwater. This would likely include a minimum of two additional monitoring wells, and could include additional "Hydropunch" or soil probe rgroundwater sampling. In addition to analyses of the PPCs of concern, future groundwater assessment should include parameters to evaluate the potential rate of natural biodegradation of the PPCs. These data may support closure of the site with ' some residual PPCs remaining in groundwater; r • Copies of this report should be forwarded to SJCPHS for review and comment. 9.0 LIMITATIONS Finding and recommendations presented in this report are based on the assumption that subsurface conditions and chemical concentrations do not deviate from those disclosed in ' the field and laboratory testing. If variations from these findings are found, Twining should be notified so that supplemental conclusions and recommendations may be provided. The purpose of a ge ologic/hydroge o logic study is to reasonably characterize existing site conditions based on the geology/hydrogeology of the area. In performing such a study, it ' is understood that a balance must be struck between a reasonable inquiry into the site conditions and an exhaustive analysis of each conceivable environmental characteristic. No investigation is thorough enough to describe all geologic/hyd rogeol ogic conditions of interest ' at a given site. Environmental conditions may exist at the site that cannot be identified by visual observation. Where subsurface work is performed, our professional opinions are based in part on interpretation of data from discrete sampling locations that may not represent actual conditions at unsampled locations. If conditions are not identified during the study, such ' a finding should not be construed as a guarantee of the absence of such conditions at the site, but rather as the result of the services performed within the scope, limitations, and cost of the work performed.