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r ., ':.... t -.n» fs-.,. •:.. .. ,. r. l Y 1r i •:4 9' wS:'• ..n:. Quarterly*port June 1998 Geweke Land.Development & Marketing ' I _ - • _ ._ •, _ f ,. a ' i. ` 16 South Cherokee Lane, Lodi,CaliforniaX. L0:' ti')1NTRODiTCTION�.AND SCOPE OF WORK s the"request of Geweke Land Development&'Markeiing:.(GLDM), ,and`in,accordance with Cleanup'and Abatement Order.No.�93-•701,Advanced.GeoEnvironmental, Inca(AGE)..has prepared this;'report:of'monitoring and.remediation'field•activities-performed at 16 South Cherokee Lane, Lodi, California during'the second-quarter•of:199&. The site and•its.surroundings are illustrated on Figure 1 - Vicinity.Map, Structures and well locations related,to the site are'shown on Figure 2',Site Plan. Groundwater and soil monitoring events are scheduled-on a periodic basis to assess remediation :progress and micro biological•activiti' ."The.scope,of woi'k:covered'by this report was to collect and evaluate field data,to`summarize the progress of the in-situ bioremediation project;.and to docurnent ' monitoring activities at the site during the secondquarter of;199$. Results'of pre'vious•investigatiohs are detailed in the.Problem Assessment Report (PAR) and the Quarterly Report = March 1996.," Analytical results from previous monitoring events are included in Tables. 4, 5-and,6 of this report.' . 2.0: PROCEDURES 2.1. ADDITION OF HYDROGEN PEROXIDE ' On,26°May'1998,-the addition of hydrogen peroxide,to ,wells at the site was performed.-,A'toial of142.gal : wells a on s to The h dro ro ide, dil t wap 1 percent,was added to fifteen monitoring and vapor . y g p , s added to,incre.ase dissolved 'oxygen concentrations'in ground water'to pramote'biodegradation,of hydrocarbons.:The volumes added to:each well are ' summarized on.Table 1 1 .2.2. MONITORING WELL PURGE PROCEDURES ; •r Ori`09;June 1998;a Solinst water level meter was used to`measurethe depth to,ground water in each ' _ - monitoring well relative to'the top of the well casing r(Tab1e 2): Monitoring wells MW-6; M'W MW-8; MW-9; IVIW-11 MW=.12 and 1VIW=14'were:purged using a 2-inch diameter.submersible .. PUMPA.minimum of-three well volumes of water'was,reinoved.from each well: ,Temperature; pH and conductivity of the purge water.'were measured at,regular intervals using an ' t ICM wafer,analyzer. The measurements:iu,ere,recorde'd on field logs. The percent-dissolved oxygen, '. was measured in the;f nal tpurged water of each well'. Stabilization'data and field sheets are included in Appendix A.The"purged water'was placed-in DOT-approved drums•and was stored on site. Advanced Geo nVironmertal,inc "