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Harding Lawson Associates September 26, 1988 17060, 008 . 03 The Southland Corporation 5820 Stoneridge Mall Road Pleasanton, California 94556 RF C Attention: Mr. Hal Miller F/ Gentlemen: Results of Vapor Survey and Additional Ground-Water Monitoring 455 West Grantline Road Tracy, California This letter presents the response of Harding Lawson Associ- ates (HLA) to the draft communication of Mr. Gordon Boggs of the Central Valley Regional Water Quality Control Board (CVRWQCB) dated August 29 , 1988 , and addressed to Ms. Laurie Cotulla of the San Joaquin Local Health District. Mr. Boggs' communication was in response to HLA's Interim Report, Phase IV Investigation, Tasks 3 and 4 , dated August 25, 1988 . That document contained a proposal to install a deep well , along with a description of the installation of shallow borings and monitoring wells, and the results of chemical tests on soil and ground-water samples. In his letter, Mr. Boggs indicated that the proposed 60- foot-depth of the deep well was excessive. He indicated that the well should extend into, but not through, the con- fining layer that separates the first and second aquifers. We agree that a shallower well is more desirable; we there- fore wish to revise the projected total depth of the well to between 30 and 40 feet. We believe that on-site conditions may dictate the need to go beyond 40 feet and that the ulti- mate well depth is best determined in the field by our geol- ogist. Recommended procedures for installing, developing, and sampling this well are the same as those presented in our Interim Report of August 25, 1988. The location of the deep well is shown on the attached Plate 1. Mr Boggs' letter also requested a vapor study inside the convenience building, reasoning that the subsurface fill Engineers 1355 Willow Way Teleonone Arizona Colorado Texas and Suite 109 415/687-9660 Alaska Hawaii Telecody Geoscienusts Concord.CA 94520 California Nevada 415/687-9673.