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0 0 <br /> ( JIterraphase <br /> e ng i <br /> g n e e r n g <br /> October 13,2017 <br /> Subject: Scope of Work for Limited Environmental Investigation <br /> 455 E. Eleventh Street,Tracy, CA 95376 <br /> Site Background <br /> The Site is located on the north side of East Eleventh Street in a mixed commercial and industrial area of <br /> the City of Tracy,California(Figure 1).The Site is a rectangular shaped parcel and is currently occupied <br /> by Cal Custom Audio.An office building is located near the southern property boundary and three <br /> storage sheds are located north of the office building. <br /> AGE performed a Phase I ESA in August 2017 in conformance with the scope and limitations of ASTM <br /> Practice E1527-13, US-EPA AAI for 455 East Eleventh Street,Tracy,California,the Site.The AGE Phase I <br /> ESA revealed the following two RECs. <br /> • Three 55-gallon steel drums were noted on the north side of the western lumber shed. Drums <br /> were not labeled,secondary containment was not present, and heavy thick oil staining was <br /> noted surrounding this storage area. Additionally,oil saturated absorbent was surrounding the <br /> drums. <br /> • Heavy oil staining and pools of oil were observed throughout the back repair shop area during <br /> the time of the site reconnaissance. <br /> The AGE Phase I ESA also revealed the following historical REC(HREC). <br /> • One 550-gallon underground storage tank was removed from the property in 1988. One sample <br /> was taken from the tank pit during removal. No contaminates of concern were reported over <br /> laboratory reporting limits. In February of 1994,San Joaquin County Environmental Health <br /> Department confirmed the completion of the tank removal investigation and determined that <br /> no further action was required. <br /> During the AGE 2017 site reconnaissance,the existing office building was utilized for the sales of car <br /> stereo equipment and the storage sheds were utilized for auto repair. Based on AEG's review of <br /> historical documents,the Site has been developed with the current existing buildings since at least 1957. <br /> The Site was occupied by San Joaquin Lumber Company since approximately 1965 until approximately <br /> 1999,when California Custom Audio began leasing the Site in 2008.A 550-gallon underground storage <br /> tank(UST)which reportedly contained gasoline,was removed from the southern portion of the Site in <br /> 1988.One sample was taken from the tank pit during removal. Gasoline, benzene,toluene, <br /> ethylbenzene,and xylenes)were not reported over laboratory reporting limits in the sample taken. In <br /> Terraphase Engineering Inc.11404 Franklin Street,Suite 600 1 Oakland,California 94612 1 w .terraphase.com <br />