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Advanced <br /> GeoEnvironmental, Inc . o=:- <br /> 02 June 2015 <br /> AGE Project No. 14-3154 <br /> Ms. Ann Palmer and Mr. Gerald Djuth <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive, Suite <br /> Rancho Cordova, CA 95670 <br /> Subject: Site Assessment Work Plan Addendum —June 2015 <br /> FORMER PILKINGTON NORTH AMERICA — LATROP FACILITY <br /> 500 East Louise Avenue, Lathrop, California <br /> Dear Ms. Palmer: <br /> At the request of R&B LOUISE LLC PROPERTY, Advanced GeoEnvironmental, Inc. <br /> (AGE) has prepared this Site Assessment Work Plan Addendum — June 2015 for the <br /> property located at 500 East Louise Avenue, Lathrop, California (site). On-site <br /> structures and proposed boring and well locations are illustrated in Figure 2 and <br /> Figure 3A. The site property is located along the south side of East Louise Avenue in <br /> Lathrop, California, an incorporated area of San Joaquin County. The property <br /> comprises seven parcels (198-120-08 main, 198-120-09 southern and 198-210-14 <br /> eastern) totaling approximately 113 acres. <br /> BACKGROUND <br /> In 1996, a diesel fuel leak from underground piping associated with an above ground <br /> storage tank was discovered at the site. An investigation of the diesel release has been <br /> underway for decades and findings indicate the diesel contamination within the soil and <br /> groundwater is greater than natural attenuation or dispersion can mitigate. Currently, <br /> groundwater monitoring and passive free-phase petroleum product recovery is being <br /> performed as required by a directive from the Central Valley Regional Water Quality <br /> Control Board (CVRWQCB). However, the CVRWQCB has directed evaluation of more <br /> "aggressive" cleanup methods. AGE has reviewed current data and collected <br /> measurements of the shallow free-phase petroleum (within well RW-4) near the release <br /> area and evaluated options for more aggressive remediation. Essentially, without active <br /> removal of the adsorbed soil mass of petroleum, free-phase product will continue to be <br /> generated and inhibit site closure. <br /> Active vacuum extraction of petroleum off the surface of the water table would likely be <br /> the most cost effective technology to attain site closure; ongoing, passive monitoring <br /> 837 Shaw Road •Stockton,CA 95215 <br /> Telephone(209)467-1006•Fax(209)467-1118 <br />