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MENM0 202 nand ratio. Complot ion/conatruc t Ion in an shown on tho Wall/Boring Log promantad in Appendix D. Soil borings wore groutod to the aurfaci with a coment-sand grout mix. Drill cuttings wore logged continuously for charactarlintion of contamination and coil typo by an oxporlonctd Staff Guologiat using the Unified Soil Clansification System. Dancriptiona of coils encountered and monitoring wall construction details were recordad on boring/wall .logs and are Included within Appendix 13. Soil camplon were colluctad fron oath boring at five-foot inter- vale. The samples were collected using a 2-inch diameter by IS- inch long split spoon namplur lined with 6-Inch long thin walled braou coil tubes. The sampler van driven its entire lonoth Into undisturbed *oil by a 140-pound drop hammy r. Sample collection began at a depth of five foot; no coil samples worn colloctod for laboratory an*lynic below the groundwater table. Soil samples submitted for analysis wore colocted based on obvi- ous signs of contonination (i.e. odors and soil discoloration). Samploo were collected. preserved and transported under chain-of- custody in accordance with WatorWork'a Quality Accuranco/Quality Control Plan (Appandix C). Select vanplan were analyzed fer banzonz, toluene, xylones, and athylbenzono (BTXE), total pntrQ- loum hydrocarbona (TPF!) as gasoline, and orga,wic lead by appro- priato EPA and DHS mathodolc9lun. Sequoia Analytical laborato- r1on (Mb Cert No. 1210) porformad the analyses. The soil cuttings vore covered with 6 oil plastic on-sito. Soil clitcinUs and groandwater mill be properly dicpNooed of in a timely Aid appropriate mannor after reviewing the anal7r1c3l results and receipt of r%ulotory Lqency 3pproval. Groundwater 4as monitored In accordance with WularVorg's QA/QC Plan (topandix C). Subanquent to wall Installatiin, water aam- plea wore collected from the monitoring well attar purging a mlni:lum of four woll volutLoo from each well. A well volume in defined as the amount of groundwater in the wall caning and sand pack In the annular npaao surrounding the .:acing. Stabilization of EC, pH, and temperature were chocked after purging and before and af;:er sample collection to ensure samples collected are representative of formation water. The purged water will remain on-sits, In eacured 55 gallon drums, until laboratory results are received. A proposal for treatment or disposal of the water produced during developmant will then be prepared. Water sample collection and preservation was In accordance with Watariyeirk's OA/CC .an (Appendix C). The water sampler were analyzed by Sequoia Analytical laboratories for BVXE, TPH as qa*clina, and hodologles. organic lead by appropriate EPA and DHS mot. Bailers with bottom emptying devices to reduca volatilikntion were used to collect groundvatur saoplea. Greg Lyon of San Joaquin County Public Health SnrvLcas was present during well development and 48MPling. 4