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rye S <br /> DAMES & MOORE A PROFESSIONAL LIMITED PARTNERSHIP <br /> 1320 EAST SHAW AVENUE, SUITE 110, FRESNO, CALIFORNIA 93710 (209)222-7892 <br /> FAX(209)222-1937 March 30, 1990 <br /> Chevron U.S.A. <br /> P.O. Box 5004 <br /> San Ramon, California 95001 <br /> Attention: John Randall <br /> RE: Proposed Additional Work <br /> Well Destruction <br /> Chevron S.S. #96465 <br /> Pershing Avenue & Robinhood Drive <br /> Stockton, California <br /> Gentlemen: <br /> Pursuant to your request, we have prepared a workplan addendum for the <br /> destruction of three groundwater monitoring wells at the above--referenced subject <br /> property. The following proposal summarizes the details of our workplan. <br /> The existing monitoring wells installed by others at the subject property <br /> were intended primarily as monitoring devices, and the aquifer penetration of the <br /> wells was limited to depth necessary to obtain data describing water level <br /> information and groundwater sampling at the time of well installation. Recent <br /> depth sounding tests suggest that the groundwater in the area has dropped below <br /> the bottom of wells 4, 5 and 2„(Plate 1) . - In Dames & Moore's opiniob, these <br /> wells no longer serve a useful purpose and should be destroyed pursuant to the <br /> San Joaquin' Local health District (SJLHD) Suggested Procedures for .well <br /> destruction. <br /> TURPOSE 'AND SCOPE OF WORK <br /> The purpose of the destruction of the three monitoring wells is to ensure <br /> that usable groundwater data will 'be obtained from the new .proposedMonitor.ing <br /> wells, thereby eliminating wells of questionable utility. The'destructi[on of the <br /> Wells will ke `in compliance with SJLHD.' Suggested Procedures for well destruction. <br /> The proposed scope of services will include the following tasks: <br /> o Review of reports detailing previous investigations at the subject property; <br /> o obtaining required permits prior to the commencement of the field portion of <br /> the well destruction. <br /> o Destruction of three existing groundwater monitoring wells at the subject <br /> property. <br /> o Preparing a report to present our findings, conclusions and recommendations. <br /> OFFICES WORLDWIDE - <br /> e <br />