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'- Geological Audit Services, Inc <br /> — = ^� Environmental ProfessionalsTMO <br /> 1803W.March Lane,Suite A•Stockton,CA 95207•(209)956-0264• 93 AX?g ' 6-070 S P11 2• <br /> 16 <br /> September 10, 1993 <br /> Ms. Mary Meays, REHS <br /> San Joaquin County PHS/EHD <br /> 445 N. San Joaquin Street <br /> Stockton, CA 95201 <br /> Subject: Request for Revised Project Schedule <br /> 204 E. Lodi Avenue <br /> Lodi, CA <br /> Dear Ms. Meays: <br /> The purpose of this letter is to request that the deadline for <br /> sub=mission of the FtoLle.r: Assessment Report for the referenced site <br /> be revised from October 1, 1993 to November 1, 1993 . This revision <br /> is necessary to accommodate scheduling difficulties and changes in <br /> the scope of work. <br /> The quarterly report submitted by our office in May 1993 <br /> recommended a pumping test of monitoring well MW-1, the only 4-inch <br /> well on the site. Subsequent review of the completion data for this <br /> well indicates that it was drilled to a depth of 70 feet, <br /> backfilled to 65 feet, and completed with PVC screen to 35 feet. <br /> The screened interval consists of moderately permeable silt at the <br /> top of a highly permeable sand layer of unknown thickness. We do <br /> not believe that the screened interval will yield a sufficient <br /> volume of water during pumping to provide reliable drawdown data in <br /> any of the surrounding observation wells. The depth and/or diameter <br /> of other wells is insufficient for a pump test. Therefore, we are <br /> revising our proposal to include a slug test instead of a pumping <br /> test. This proposal will be submitted to our client next week. <br /> We are also revising the proposal to include a vapor extraction <br /> pilot test, as recommended by you in telephone conversation on <br /> September 2 . <br /> It is unlikely that arrangements for these tests can be completed <br /> in time to meet the October 1 deadline. At present, we estimate <br /> that the slug test could be performed in early October and the <br /> vapor test later in the month. This would allow us time to analyze <br /> the data and submit the PAR by the end of October. <br /> Sincerely, <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> y <br /> Victor B. Cherven <br /> Project Manager <br /> cc: James V. DeMera, III, Mullen, Sullivan & Newton <br /> Mary Lehr, client <br /> Full Spectrum Environmental Services• Hydrogeology <br />