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r , <br /> s <br /> Advanced <br /> Ge o Environmental Inc . <br /> y�r <br /> 17 August 2012 y`'�" il- ;� X,rlt 1-�'+�I 5 s`'�'�� <br /> AGE-NC Project No. 01-0887 <br /> RECEIVED% <br /> Ms. Vicki McCartney �� <br /> San Joaquin County Environmental Health Department AUG 2 2 2U12 ``�,` <br /> 1868 East Hazelton Street E[IMRONMEN'TAL.HEALTH <br /> Stockton, California 95205 PERMIPSERVICES <br /> Subject: No Further Action Required Report Addendum & Soil Vapor Intrusion <br /> Work Plan - August 2012 <br /> SARALE FARMS rev'0ectl_g <br /> 16500 Clifton Court Road, Stockton, California Pl Dear Ms. McCartney: r,:F-�A[ �+ <br /> r' <br /> At the request of Ms. Sandi Sarale, Advanced GeoEnviron mental, Inc. has prepared this <br /> No Further Action Required Report Addendum & Soil Vapor Intrusion Work Plan -August <br /> 2012forthe site located at 16500 Clifton Court Road, Stockton, California. The addendum <br /> provides estimates of when shallow ground water, impacted with dissolved phase <br /> hydrocarbons, may achieve water quality objectives and the work plan provides procedures <br /> for the advancement of three (3) borings to evaluate the potential for hydrocarbon soil <br /> vapors to intrude into the onsite buildings. The addendum evaluation and work plan were <br /> prepared as required by the San Joaquin County Environmental Health Department, by <br /> letter dating 26 July 2012. The site location and plan of the site, which includes boring <br /> locations are attached in Figures 1 and 2. The referenced trend graphs are attached in <br /> Appendix A. Historical ground water analytical results are included in Table 1. <br /> TREND GRAPH ANALYSIS OF SHALLOW GROUND WATER <br /> ' -'�P Based on the most current analytical results for the site, monitoring wells MW-1, MW-2 and <br /> "'�MW-3 are the only wells at the site with remaining dissolved hydrocarbon impact. <br /> Concentrations of total petroleum hydrocarbons quantified as gasoline (TPH-g), methyl <br /> tertiary butyl ether (MTBE) and benzene were plotted against time for each of the three <br /> wells. A trend line was then used plotted through the concentrations in an attempt to cross <br /> the x-axis and to predict when each constituent would reach a non-detection level (achieve <br /> water quality objectives). <br /> Based on trend graph analysis, estimates of when water quality objectives, if attainable, <br /> are provided below; trend graphs are included in Appendix A. <br /> 8,;7 Shaw Road • Stockton. C'A 95715 <br /> "fcicphonc (209)467-1006 • Fax 1209!467-1 1 18 <br />