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• - ��L�LI tiJ l <br /> Working To Restore Nature <br /> 1710 Main Street <br /> tscalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> August 29, 1494 <br /> Ms. Mary Mcays <br /> San Joaquin County Public Health Services <br /> Environmental Health Divisien <br /> P.O. Box 2= <br /> Stockton. CA 95201 <br /> Subject: Stockton Police Facility, Site Code 1178 <br /> 22 East Market Street, Stockton, California <br /> Ms. Metys: <br /> This Letter is submitted on behalf of the City of Stockton in response to correspondence dated. <br /> July 11, 19=34 from Ms. Mary Meays of San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) regarding the above refs mmced site. <br /> rMIDUAL SOIL CdDNTARMA7TON <br /> All accessible hydrocarbon impacted soil was removed through excavation. Further <br /> excavation vas not possible due to the close proximity of the building. The location of the <br /> existing structure and its relation to the excavation and residual hydrocarbon impacted sail is <br /> shown on Figure 1. No evaluation as to the cost effectiveness of in-situ soil vapor exMctic n <br /> was not conducted because soil ver extraction was dismissed as a viable remedial motion dos <br /> to the fine-grained nature of subsurface soil beneath the site(stiff silt to fat clay). <br /> Due to the high absorbency of the soil type(Jacktone Clay), the presence of fat clay at a depth <br /> of approximately seven feet below grade, the lack of residual hydrocarbons below <br /> approximately eleven feet, the depth to groundwater (>40 feet), and the presence of an <br /> asphalt cap, residual soil contamination is not expected to impact groundwater beneath the site. <br /> Preliminary contaminant fate and transport models such as the Leaching Potential Analysis <br /> froth the LUFT Manual are simplistic models based upon generalized site:characteristics such <br /> as depth to water, annual precipitation, and concentration of residual contaminants, but maw <br /> mrmtaa��u.aa�9a.Frr� <br /> Z d 6056 8CO 602 WUTS=OT VG, 62 9)nU <br />