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• Quarterly`Re ort - Septembe' r-1999 Geweke Land`Development& Marketing' I16 South Cherokee Lane, Lodi, California ; 1.0 INTRODUCTION AND SCOPE'OF WORK ' At.the request-of Geweke Land.Development & Marketing'(GLDM), and ih7 accordance.with. I °Cleanup and Abatement.Order'No. 93-701,Advanced GeoEn ironmental;Inc. (AGE)has prepared this•reportof monitoring and remediation field activities performed ai 16 South Cherokee Lane, , Lodi, California during the third.quarter of 1999.The site and itssurroundings are illustrated on Figure 1'- Vicinity,Mrip. Strictures and well locations related to the-site are'shown ori Figure•2'-,Site,. Plan. (` The sco P e,of work covered bye this report was to collecf'ground water samples for analysis to :characterize the,current status of the.hydrocarbon impact at the site, to,summarize,the.progress of.a nl � - the in-situ bioremediation project , and to-document monitoring activities.at the'site during the third .I, quarter=of 1999. At the request of-the San Joaquin County Public Health Services Environmental Health Division'(PHS-EHD), surveys were conducted to identify potential receptor wells near the r ' site and to identify additional sites near the subject property which may be 'contributing to the Results of revious investi ations are detaiied-in.the identifiedground water,contaminant plume. p . g Problem Assessment Report(PAR),'the Quarterly Report'-March 1.996 and the Quarterly Report- March and June 1999. Analytical results from-previous monitoring events are included in'Tables - 2,•3, 5.and 6 of this report.- 2.0. eport:2.0. PROCEDURES Quarterly ground'`'water rhoriitoring was performed on '30 September 1999.,Field 'work was'. , erformed in accordance.with PHS-EHD and-Central Valley Regional Water-Quality Control-Board (CVRWQCB) guidelines•for the investigation ofunderground storage tank (UST) sites. . ' . 2.1. MONITORING WELL PURGE PROCEDURES I On 30 Sepfembe`r 1999;.a Solinst water level meter was used-to measure the depth to groundwater. in ten wells relative to-.the tops of the'well,casings (Table•1). Wells MW-6, MW-7, MW-S', MW-9, ' MW 11, 'MW-12;and, MW-14 were then purged using .a Grundfos, submersible purge pump.: Approximately eigtit`to ten gallon -of water(minimuiri.of three-well-volumes) were removed from, " Ieach well during.purging: . Temperature;pH and conductivity of.the purge water were measured at two'-gallon intervals"using• a Hydac water analyzer.and the'readings were recorded on field logs.'The percent dissolved'oxygen was measured in.the final purged water:of each well.-Field data and work sheets are included-in, ; �- App dien i T e iur ed water was laced in,DOT-a roved drums and stored'on-site. x A. h p S .p. pp. , . _ ;Advanced_ GeoEnvironmental,.Inc.