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1 <br />1 <br />11 <br />r <br />0 <br />sampling will be performed as part of ongoing Subchapter 15 compli- <br />ance. <br />D. PROCEDURES FOR OBTAINING BACKGROUND WATER QUALITY <br />Surface -water Sample SW -1 and ground -water samples from the proposed <br />background Well MW -2 located southwest of the site (see Section III.A) <br />will be analyzed to provide background water -quality data. If a <br />shallow, perched ground -water zone is confirmed, an upgradient or <br />crossgradient shallow well will be installed for background water - <br />quality determination. Background water quality for the SWAT program <br />will be determined from the initial sampling event. <br />E. UNSATURATED (VADOSE) ZONE MONITORING PROGRAM <br />The Corral Hollow Sanitary Landfill is unlined. Therefore, unsaturat- <br />ed zone monitoring is not required under section 2559(a) of Subchapter <br />15, Title 23 of the CAC. Also, unsaturated zone monitoring is not <br />thought to be feasible at the site due to insufficient moisture <br />content in the sandy intervals beneath the Corcoran Clay. Based on <br />observations made during drilling (EMCON, 1988), the soil suction may <br />be too high for extraction of soil moisture from the unsaturated zone. <br />F. UNSATURATED (VADOSE) ZONE SAMPLING AND ANALYSIS <br />Section 13273 of the California Water Code, as amended by the Calderon <br />Bill, requires that a chemical characterization of the soil -pore <br />liquid in the unsaturated zone be conducted in areas that are likely <br />to be affected if a solid waste disposal site is leaking. The result- <br />ing chemical characterization is to be compared to an unaffected <br />sample from a geologically similar area. <br />14 <br />Emon Associates <br />