Laserfiche WebLink
Beacon Station No 1641 July 10 2003 <br /> Stockton California Prelimmary Results Report and Wort.Plan Addendum <br /> •� from below the water table The CPT soil log utilizes an integrated electronic cone system to <br /> measure the soil parameters for computer tabulation of soil types The groundwater samples <br /> are collected with a hydropunch-type sampling tool Fieldwork was generally performed <br /> according to the Horizon Field Methods and Procedures (Appendix B) <br /> Well permits SR# 0032488 and SR# 0032489 (Appendix A) were obtained from San <br /> Joaquin County Environmental Health Services to allow the advancement of the on-site and <br /> off-site soil borings Gregg In Situ, Inc of Martinez, California (license #C57-656407) was <br /> retained to provide groundwater sampling and CPT logging services Undgrground Service <br /> Alert was contacted on January 29, 2003 for locating underground utilities The fieldwork <br /> for the preliminary phase of the additional subsurface investigation was conducted on <br /> February 3 and 4, 2003 <br /> Locations of the CPT-log boring B-4 and soil borings B-5 through B-8 are shown on Figure <br /> 2 The CPT-log boring B-4 was advanced to 100 feet bsg to obtain a log of the soil profile <br /> • and a depth to groundwater A pore-dissipation test was performed at approximately 67 feet <br /> bsg to evaluate the static groundwater level No soil or groundwater samples were collected <br /> from boring B-4 The CPT log generated at the site is contained in Appendix C <br /> The CPT boring B-5 was advanced through an existing conductor casing set in the UST <br /> basin backfill adjacent to the nested vapor wells VW-5/6 The boring was initially advanced <br /> to 100 feet with soil samples collected at depths of 75, 85 and 95 feet bsg and a groundwater <br /> sample collected at 100 feet bsg The 100-foot bsg groundwater sample (W-B5-100) was <br /> submitted for analyses on an overnight basis to evaluate the need to advance the boring <br /> deeper Analytical results indicated hydrocarbon impacts in groundwater at 100 feet bsg <br /> The B-5 boring was further advanced to 130 feet bsg with soil samples collected at 120 and <br /> 130 feet bsg and a groundwater sample collected at 135 feet bsg <br /> W Paddnm7-03 <br /> Project No 1641 16 4 HORIZON ENVIRONMENTAL INC <br />