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Environmental' 5 Services;Inc. . . . r i ` )1;� ��, , -03 Construction ♦.Engineering . Remedtahao 53 r Jun.e. 24 , 2003. Ms. Janice Brown cio Cox& Cox 1;93 Arrowhead Drive - St:Helena, California 94374 Re: Cox& Cox, Quarterly Monitoring Well Sampling Report Site at 1,9�East 11th Street,Trace.CA Dear Ms.Brown. WriGht Environmental,Seryices, Inc- ( 'right),has prepared this ouart�rly report for-the above. referenced site. As. You lmow, several phases of work..have been performed W�this site:*Th,s aua.... oundwatei.inonitorine work is in response to a request'from the -San Joaquin Count~' public Heaitfs Services (PHS EHD) for site quartern, aroundwater monitonnG- Monitoring Weil-Sampling Methods The site was sampled on'April 8. 2063' The attached tapie.lisff the wells•hisioric and:current Groundwater level data (-see,Table 1). The-contract sampt , proceeded to purge well volumes of stoundwater using a submersible le^trig purging pump {a'voliime calculanon -was done.for each well following.,soundinG'measurements). Conductivjn DH. and' water tempemture readings. were obtained 'benueen each 'well volume purge—and these' were noted on the arached groundwater sampling information sneers. Once these-readinss stabilized after two consecutive pttige. voiumes, aquifer'water is assumed to.be nterin_ the well. Wien-the well recovered to about 80% of the initial water level, the sample was collected. Purge water was stored on-site in drums` The well sampling inf6mation sheets are attached. The groundwater sample was collected vi7th an ew disposable bailer. T1ie groundwater.sarnpie was then poured u^th minimum cavitation.into'the.appropriate, laboratory prepared sample coritainers'leavin, no headspaceThe sample container was then immediately capped, labeled under chain-df-custodydocumentationand.placed in a chilled ice chest for shiprnent to Chromalab,:inc. in Pleasanton:Caiifornia.(a State-Certified Testing Lab). Groundwater Contour Map and Flow Gradient A ��oundwater.contour. map to-a lffiown' datum was prepared for-the data listed in Table 'l (see Figure 1). The .�Toundwater flow direction was northerly ender a, calculated,mdiept.of 0.003,;which is,.consistent with historic observed trends. Overall,groundwaterlevels appear to have declined about 025 feat from the previous quarter: 67.E. 10th Street, . Tiacy,CA 953.76- 249.833.0758,* Fax 209.832:5152 -right@inreach. com Lic. #651501 A-B HazMat, C21. websit http://wrightenvironmentalservzces.com