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WATERWORK <br /> GEOC G�t+GFOTFCHNICAL•ErjMRCNMENTAL <br /> October 9, 1990 FILE <br /> Mr. Jim Escobar <br /> City of Stockton <br /> 425 North El Dorado Street <br /> Stockton, CA 95202-1997 <br /> Re: City of Stockton Fire Station # 6, 1501 Picardy Drive, <br /> Stockton, CA <br /> Dear Mr. Escobar: <br /> The attached report describes the soil sampling and laboratory <br /> results for re-excavation at the above referenced site (Figure 1). <br /> The re-excavation and sampling were conducted on September 7, <br /> 1990. Although a substantial amount of diesel contaminated soil <br /> was removed, the excavation was limited on all sides by City <br /> walkways. Additional removal of soils could not be achieved <br /> .laterally and from below 14 feet without destroying City <br /> walkways. Laboratory results indicate significant concentrations <br /> of diesel hydrocarbons remain in the soils beneath the location <br /> of the former underground diesel storage tank (Table 1 and Figure <br /> 2). Because of a fairly shallow water table (approximately 35-40 <br /> feet below grade) the San Joaquin County Public Health Services <br /> Environmental Health Division will likely require the <br /> installation of a monitoring well(s) to determine if groundwater <br /> has been impacted. In addition, the County will likely require <br /> further remediation of soils remaining in plae�estrian and <br /> if re- <br /> excavation of soils is undesirable due to heavy p <br /> vehicular traffic in the area, other alternatives such as cap <br /> and monitor or soil venting may be employed. <br /> If you have any questions or require additional assistance, <br /> please contact me at our Escalon office 209/838-3507. <br /> Respectfully: <br /> WaterWork <br /> Bill Channell <br /> Senior. Geologist <br /> JPL/tdp <br /> Attachment <br /> 1710 NIAN STREF1 ESCALCN-C.A 45.320 <br /> :7�;��q.CA(24•x;=22.,,;,y5 �E�.O.rril;'02) '°�-td30 <br />