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ENVIRONMENTAL HEALTH NEPARTMENT <br /> ,gPgUIN CO <br /> :Z SAN JOAQUIN COUNTY Program Coordinators <br /> Donna K. Heran, R.E.H.S. g <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> " Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> C4 %FOR�\P Assistant Director Telephone: (209)468-3420 Margaret Lagorio, R.E.H.S, <br /> Robert McClellon, R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> ANDREW EGGIMAN AUG 16 2006 <br /> C/O ROBERT EGGIMAN <br /> PO BOX 580 <br /> MOUNTAIN RANCH CA 95246 <br /> RE: Eggiman's Hydraulic SITE CODE: 1914 <br /> 1112 E. Harding Way <br /> Stockton CA 95205 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed <br /> Summary Report of Additional Subsurface Investigation (Report) and Corrective Action <br /> Plan (CAP), both submitted on July 13, 2006 to Geotracker, Addendum to Proposed Work <br /> (Addendum) dated May 2, 2006 and Monitoring Report Second Quarter 2006 dated <br /> August 1, 2006, which were submitted to SJC/EHD on your behalf by ATC Associates Inc. <br /> (ATC), and has the following comments. <br /> The Report documents fieldwork that was conducted in November 2005. Five soil <br /> borings, SB-9 through SB-13, were advanced to investigate the lateral extent of the <br /> shallow contamination at this site, in both soil and groundwater. Total depth of these <br /> borings was between 50-55 feet below surface grade (bsg). Soil samples for analysis <br /> were collected from all five borings; grab groundwater samples for analysis were collected <br /> from four of the borings. One soil sample, the 50-foot bsg sample from S13-9, contained <br /> 1.6 milligrams per kilogram total petroleum hydrocarbons as gasoline. Unfortunately the <br /> drill rig met refusal in boring SB-9 and a water sample was not obtained at this location. <br /> Two of the four water samples collected, SB-1 0-W and SB-11-W, contained reportable <br /> concentrations of petroleum hydrocarbon contaminants. The Report recommends further <br /> investigation of the lateral extent of the shallow groundwater contamination to the west <br /> and south of the site, and continued quarterly groundwater monitoring and sampling. <br /> The CAP discusses three alternatives for site remediation, and recommends conducting a <br /> pilot test to evaluate the feasibility of performing soil vapor extraction in combination with <br /> air sparging (SVE/AS). The CAP did not include calculations of the contaminant mass <br /> remaining at the site that would be targeted for removal by remediation, cross-sectional <br /> diagrams or a technical justification for recommending SVE/AS as the most appropriate <br /> remediation method for this site. The Addendum proposes construction details for <br /> installing three SVE wells and one AS well to conduct a pilot test. <br /> The average depth to water at this site over five years of groundwater monitoring has <br /> been approximately 45 feet bsg; the deepest it has been measured is 53.16 feet bsg. <br /> ATC, however, states in section 5.0 of the Report that the capillary fringe at the site is <br /> from approximately 50-65 feet bsg. ATC states that soil contamination is present near the <br />