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• Quarterly Report December.-1997 Geweke Land Development & Marketing-, I16 South`Cherokee lane,lodj,Caiifoinia „ . INTRODUCTION AND SCOPE OF WORK At tie:request of Geweke'•Land Development & Marketing (GL)M);-and in accordance with .,, .. .Cleanup and-Abatement Order No. 93-701,A.&anced GeoEnvironmental,Inc. (AGE) has prepared -' , this report of;monitoring and remediation field activities performed at.16 South Cherokee Lane, Lodi, California during the fourth quarter of 1997. The site and its surroundings.a. illustrated on Figure 1, -'Vicinity-Ma,0. Structures and well locations related,to the site are,shown,on Figure 2 -Site, Plan. Ground water and soil. inanitoring is scheduled on a periodic basis to assess remediation progress, and microbiological,'activities. The scope of work covered by this report was to collect and'evaluate field data, to-.summarize the progress of the in-situ bioremediation project, and-to document monitoring activities at the site during the fourth quarter of 1997. Results of.previous investigations ; Y. and monitoring events at the site are detailed in,the Problem Assessment,Report(PAR) and the ' Quarterly Report-March 1996 • 2.0. .PROCEDURES 2.1: MONITORING'WELL PURGE PROCEDURES On 1,6 December 1997, a Solinst water-level meter was used to measure-the depth to ground water. in each.monitoring well relative idth'e-top.of the well casing,(Table..1).:Monitoring wells MW-7, ' MW.-8,-MW-9 MW-11 MW-12•and MW-14 were then ' a 2-inch diameter submersible ur ed usin . ' P . g .g pump. Monitoring ,well MW-6 was,purged using a clean PVC bailer. A minimum of-three'well volumes•of water was`rernoved from each purged well. In accordance with the revised moriitoring and'r'eporting program No. 93-701, monitoring wells MW-1 through MW-S;.MW-10, MW-13:and EW". were not sampled.-, Temperature;pH and conductivity of the purge water were measured at regular;intervals using an .` ICM-water analyzer. Dissolved oxygen was measured at the'beginning of purging of each well . utilizing a YSI-55 rh-situ percent oxygen meter.'Monitoring,well stabilization data and field sheets - are.included-iri Appendix A-. The purge water wasplaced`in DOT-approved drums and stored on=site.; ' ,2.2. COLLECTION OF GROUND.:WATER SAMPLES'' '-� Water samP'l.es`were collected-from e_ ach purgedwel.l..u.sin disposable...•plastic bailers,. Immediately, . , upon retrieval;the samples were transferred into 40-m1 EPA-approved.VOA'vWs containing 0.5 ml Advanced,GeAnvironmental,Inc. 1