Laserfiche WebLink
1 <br /> A S S O C I A T E S I N C <br /> of contaminant Impact to groundwater Based on their review, the SJCEHD requested a work <br /> plan to investigate the lateral and vertical extent of the contamination at the site and to evaluate <br /> remedial alternatives for cleanup of the site <br /> 2.0 METHODS AND 11nRO Cll'<YDURES <br /> 1 To evaluate the vertical extent of Impacted soil and possible lateral migration of impacted <br /> groundwater beneath the site, one cone penetrometer test (CPT) boring was advanced <br /> 1 immediately adjacent to the former UST locations, one CPT boring was advanced in the <br /> downgradient direction near the domestic well, and three Geoprobe® borings were advanced in <br /> 1 the vicinity of the former UST locations The soil borings were grouted to the surface with neat <br /> cement after samples of soil and groundwater had been collected Field activities were performed <br /> in accordance with ATC's Workplan for Additional Subsurface Investigation at Three Palms <br /> . Grocery located at 6732 East Highway 88, Stockton, California submitted to SJCEHD on <br /> January8, 2004 This workplan was approved by SJCEHD on March 11, 2004 <br /> 2„.1 Soil BoringAdvancement and Sampling <br /> On March 24, 25, and 26, and May 20, 2004, three soil borings (GPI, GP2 and GP3) were <br /> advanced at the site in the vicinity of the former USTs to evaluate the lateral extent of petroleum <br /> affected soil and groundwater Drilling was conducted by Woodward Drilling Co , Inc (State <br /> C57 license no 710079) utilizing a GeoprobeO drill ng Soil samples were collected <br /> continuously from the soil borings, using a 1-inch diameter acetate sleeve A field geologist <br /> logged drill cuttings and soil samples in general accordance with the Unified Soil Classification <br /> System <br /> The drill cuttings were characterized for soil type, moisture content, and visual evidence of <br />' petroleum hydrocarbons A photo-ionization detector (PID) was used as a field screening device <br /> to detect petroleum hydrocarbon vapors in drill cuttings and cored samples Drill cuttings were <br />' temporarily stored on site in 55-gallon drums pending disposal Descriptions of soil types <br /> encountered and sample collection intervals are included on the boring/well construction logs <br /> contained in Appendix A <br />' On March 29 and April 2, 2004, two CPT borings (CPT 1 and CPT2) were advanced at the site In <br /> the vicinity of the former USTs to evaluate the vertical extent of petroleum affected soil and <br /> groundwater The CPT borings are discussed in detail In Section 2 3 and copies of the CPT <br /> boring analyses are Included in Appendix C <br />' 2.2 Soil Sample Analyses <br /> Selected soil samples were placed on Ice, and transported under chain-of-custody to Argon <br /> Laboratories Inc (FLAP #2359) of Ceres, California for analysis Soil samples were analyzed for <br /> TPHg utilizing EPA Method 8015B, BTEX utilizing EPA Method 8021B, and oxygenate fuel <br /> w 1I48851repodslSum2004 doc 3 <br />