ARCHIVED REPORTS_XR0004983 - Laserfiche WebLink

Home Browse Search

1v a� o 1 A S S O C I A T E S I N C radius of influence of approximately 20 feet Approximately 0 28 pounds of TPHg and benzene were removed during one day of the air sparge pilot test and this yielded a removal of 8 68 ' pounds of TPHg and benzene during the 31-day pilot test The details and results of the air sparge pilot test, vapor extraction tests, and the installation of the air sparge wells, vapor extraction wells, and the groundwater monitoring well MW10 are described in ATC's Remedial Investigation/Feasibility Study, Pacific Coast Recreation, 3755 Munford Avenue, Stockton, California, August 13, 2002 2.0 DRILLING ACTIVITIES ' To evaluate the extent of impacted soil and groundwater four cone penetrometer soil borings were advanced at the site Soil samples were collected from the four cone penetrometer soil borings and submitted for analysis All field activities were performed in accordance with ' ATC's Workplan for Additional Subsurface Investigation at Pacific Coast Recreation, 3755 Munford Avenue, Stockton, California, dated February 13, 2003 This workplan was approved by EHD on April 10, 2003 ' 2.1 Cone Penetrometer Drilling Activities M Drilling was conducted from June 16 through 19, 2003 by Gregg Drilling & Testing Inc (State C57 license no 485165) utilizing cone penetrating testing (CPT) methods A cone mounted with sensors at the tip was advanced into the soil using direct push rods at the location shown on Figure 2 The sensors on the cone tested the response of the soil to the force of the penetrating cone and allowed the subsurface stratigraphy to be characterized The cone and rods were advanced by a hydraulic press with a down pressure capacity of approximately 20 tons to 160 ' feet bgs utilizing a truck-mounted CPT rig A copy of the Gregg Drilling & Testing Inc Cone Penetration Test Data is included in Appendix A ' 2_2 Groundwater Sampling and Analysis ' Auer the CPT borings were advanced, Geoprobe soil borings were advanced adjacent to each CPT boring The Geoprobes were advanced using a Hydropunch groundwater sampler and groundwater samples were collected at approximately 65 feet, 87 feet, 100 feet and 145 feet bgs at the locations of CPT-2, CPT-3, and CPT-4 At the location of CPT-5, a Geoprobe was advanced using a Hydropunch groundwater sampler and groundwater samples were collected at approximately 85 feet, 99 feet and 123 feet bgs The CPT borings and the Geoprobe borings ' were then grouted to the surface with a cement slurry Selected groundwater samples were placed on ice, and transported under chain-of-custody to Oh State-certified &?�.2boratories Inc (ELAP Cert No 2359) In Ceres, California for analysis /Selected0kriy were analyzed for total petroleum hydrocarbons as gasoline (TPHg) g/�l utilizing EPA Method 8015B, BTEX utilizing EPA Method 8021B, and oxygenate fuel additives including methyl tertiary butyl ether (MTBE), tertiary amyl ether (TAME), ethyl tertiary butyl ether (ETBE), di-isopropyl ether (DIPS), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2- S 1Enviromental1163931REPORTSIcptpumpreport doc 3 1