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c nren° <br /> art <br /> ENVIRONMENTAL ENGINEERING CORPORATION <br /> October 6, 1995 <br /> Ms. Margaret Lagorio <br /> San Joaquin Public Health Services <br /> Environmental Health Division <br /> 1601 Hazelton Ave. <br /> Stockton, CA 95201 <br /> SUBJECT: SOIL GAS SURVEY, APPLIED AEROSPACE STRUCTURES CORPORATION, <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Lagorio: <br /> This letter describes the proposed scope of work to conduct a soil gas survey and collect "grab" <br /> groundwater samples at the subject site. The site is located at 3437 South Airport Way, Stockton, <br /> California. Activities at the site include the manufacturing of lightweight composite structures. <br /> SCOPE OF WORK AND SITE CONDITIONS <br /> The proposed scope of work is to collect eighteen (18) soil gas samples from nine (9) locations <br /> and collect three (3) grab groundwater samples. Soil gas sample locations are provided on the <br /> attached site plan included with the document. Soil samples may be collected depending on the <br /> results of the field screening of the soil gas and grab groundwater samples. Information provided <br /> to McLaren/Hart indicates that groundwater is encountered at between 50-60 feet below ground <br /> surface (bgs) in the project area. Soil gas samples will be collected at two depths at each of the <br /> samples locations provided on the attached site plan. The first sample at each location will be <br /> collected at approximately 6 feet bgs and the second sample collected at 12 feet bgs. Based on <br /> results of the field analysis additional soil gas samples may be collected at deeper depths. <br /> Samples will be collected by Tracer Research using their Deep probe Sampler 550 (DPS 550) or <br /> Wonder Whapper. This a direct push rig designed to drive soil gas probes through unusually hard <br /> soils including zones with cobbles and caleche. The DPS 550 is mounted on a one-ton Isuzu <br /> IABP AMER\RC951466.WP <br /> 10.06.95 <br /> 11101 White Rock Road, Rancho Cordova, CA 95670 (916)638-3696 FAX(916) 638-2842 <br /> ,wycedpapw <br />