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Mr. Russell Chapin <br /> October 9, 1992 <br /> Page 3 <br /> Chapin Brothers thus requests that they be permitted to backfill the tank <br /> excavations as sooii as possible after tank removal and collection of the required <br /> samples below the tanks. Tbis would minh--nize site disturbance and would mitigate <br /> potential safety hazards posed by the proximity of the excavati-wis to streets and <br /> sidewalks. Once tank removal and backfilling is complete, Chapin Brothers will <br /> proceed with the subsurface investigation required by San Joaquin County and the <br /> California Regional Water Quality Control Board. <br /> The initial phase of investigation will include delineation of the extent of soil <br /> and groundwatcr contamination. Once delineated, the responsible parties can define <br /> and tui 'textent appropdate measures to Writlgate contaimna?loll. A mininiarn of <br /> three additional monitoring wells will be required to evaluate the groundwater flow <br /> direction and the limits of contamination. It is also likely that it will be necessary to <br /> drill borings or install wells on adjoining properties or in the City of Stockton right-of- <br /> way. <br /> State guidelines require that a"Preliminary Assessment Report"be prepared <br /> should include: <br /> • Name and address of site, tank owner, and contact person. <br /> • A map showing the site relative to nearby landmarks (see Site Location Map, <br /> Plate 1). <br /> • A site map (Generalized Site Plan, Plate 2) showing the tanks, piping systems, <br /> adjacent streets and buildings, septic tanks and leach fields, and underground <br /> iItih..ales. <br /> • Results of tank tests or initial site work completed. <br /> • Estimates of liquid leaked into the environment. <br /> • History of site use. <br /> • Local topography, geology, nearby streams, depth to groundwater. <br /> Pro--dmity of private or municipal wells and irrigation wells within 2,000 feet. <br /> • 1 ocatinnofnP.a_ rby septic tanks and undergrouild_public utility lines. <br /> k(e GFR <br /> FQDTT <br /> ititic7cr3f:� <br />