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Advanced <br /> . 'GeoEnvironmental, <br /> 19 November 2001 N 0 V 19 2001 <br /> AGE-NC Project No. 98-0468IV1PG1 ;vM I i: EALTH <br /> PER i'��i'/0kIER��IQCS <br /> Mr. Jeffrey Wong <br /> San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) <br /> 304 E. Weber Avenue, Third Floor, <br /> Stockton, CA 95202 <br /> 'Subject: Work Plan Addendum <br /> VAN BUSKIRK GOLF COURSE <br /> 1740 Houston Avenue, Stockton, California <br /> Dear Mr. Wong: <br /> Pursuant to our 11 October 2001 meeting, this letter amends Advanced GeoEnvironmental, Inc'.'s <br /> Monitoring Well Installation Work Plan, dated 21 November 2001 and approved by the PHS-EHD <br /> by letter dated 04 August 2000. The additional scope of work is proposed in response to data <br /> collected from well MW-6 at the site, and to complete the vertical assessment of dissolved methyl <br /> tertiary butyl ether(MTBE) within the upper-ground water aquifer. <br /> Two soil borings are proposed.for grab ground water sampling.-The borings will be established in <br /> accordance with the procedures approved in the referenced work plan.Further, depth-discrete ground . <br /> water monitoring wells,may be established within the soil borings in accordance with the procedures <br /> approved in the referenced work plan. One boring will be established near well MW-6 and the other <br /> near MW-7. Analysis of the samples will be in accordance with the approved work plan. The <br /> additional scope of work entails: establishment of two soil borings to 50 feet below surface grade; <br /> collection of.two grab, "in-situ" ground water samples at 50 feet bsg from the borings, utilizing a <br /> hydro-punch sampler; obtaining analytical results from the grab ground water samples in 24-hour <br /> analysis of sampling and tentative completion of the borings as ground water wells. If ground water <br /> samples collected at 50 feet bsg do not contain detectable concentrations of MTBE, then one well <br /> will be established near well MW-6, to a depth of 55 feet bsg with five feet of screen. <br /> If MTBE is detected in either of the ground water samples from 50 feet bsg, both soil borings will <br /> be advanced to a depth of 65 feet bsg, re-sampled and analyzed within a 24-hour period. If ground <br /> water below well MW-7 at 50 feet bsg is impacted,then an additional soil boring will be established <br /> in the down gradient direction(north) to re-sample the 50 feet bsg interval. A 50-foot well will be <br /> installed in the boring near well MW-7 if only,the MW-6 area boring contains dissolved MTBE at <br /> 50 feet bsg. <br /> If ground water samples collected at 65 feet bsg do not contain detectable concentrations of MTBE, <br /> then one well will be established near well MW-6, to a total depth of 65 feet bsg,with five feet of <br /> screen. - <br /> 837 Shaw Road,Stockton, California 95215 <br /> Telephone (209) 467-1006 FAX(209) 467-1118. <br />