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CRONSiriNC May 10, 1996 t Mr Michael Infurna Public Health Services San Joaquin County 304 East Weber Street Stockton, California 95202 Reference Site Investigation Workplan Addendum for the Stockton Army Aviation Support Facility, 2000 Stimson Road, Stockton, California, Versar Project No 3372-001 Dear Mr Infurna Versar, Inc (Versar) is submitting the following workplan addendum for the Stockton Army Aviation Support Facility at 2000 Stimson Road in Stockton, California (Site) The workplan addendum is being submitted, on behalf of the Division of the State Architect (DSA), in response to a San Joaquin County Public Health Services (SJPHS) letter dated October 2, 1995 and ensuing verbal and written communications among Versar, DSA, and SJPHS The addendum addresses three tasks which were originally included in Versar's "Site Investigation Workplan, " dated August 1995, the workplan was approved by the SJPHS in a letter dated October 2, 1995 The following paragraphs discuss Versar's proposed changes to the tasks AftTask I. Soil Evaluation W In Section 3 1 1 Soil Evaluation of Versar's August 2, 1995 workplan, four soil borings were proposed to be drilled and sampled at the Site The purpose of the soil borings was to complete the defining of lateral and vertical extent of soil contamination identified in previous investigations at the Site, as requested in an SJPHS letter dated May 25, 1993 However, upon further review of the results of previous investigations at the Site and based on discussions with SJPHS, Versar is proposing to delete the installation of the soil borings at the Site - _,. lask_2. Groundwater Evaluation In section 3 2 Groundwater Evaluation of the August 2, 1995 workplan, Versar proposed to purge the three groundwater monitoring wells at the Site d collect for laboratory analysis of total petroleum hydrocarbons as het fuel (TPH-JP4) and benzene, toluene, ethylbenzene, and xylenes (BTEX) However, after further review of Site history and communications with the SJPHS, Versar is proposing to also analyze the samples collected during the first round of sampling for TPH as gasoline (TPH- G) and TPH as diesel (TPH-D) Based upon the analytical results for the first round of groundwater samples, subsequent samples collected during future groundwater monitoring events will be analyzed for TPH-JP4 and BTEX only Task zl Il ii In Section 3 4 On Site Soil Wastes, Versar proposed a sampling plan for stockpiled soil and drummed ,as oil at the Site However, based on further review of Site history and discussions with personnel from the • SACRAMENTO OFFICE - 7844 MADISON AVENUE,SUITE 167•FAIR OAKS,CALIFORNIA 95628•TELEPHONE (916)962-1612 FAX (916)962-2678