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Sent By: <br />RWOCB; <br />• <br />2553439; <br />May <br />-24 16 <br />6:58; <br />Page 4 <br />. FROM : <br />CVC & abe <br />PHONE NO. : <br />209 983 9536 <br />May. 16 2001 <br />12:30PM P3 <br />groundwater contamination from both the UST and from an Above <br />Ground 10,000 gallongasoline Tank (AST). They further stated <br />that the domestic well was possibly contaminated with :Fuel <br />products_ <br />JPCA tested the domestic well on January 10, 2001. No detectable <br />contaminants were identified from this sampling event. <br />The proposed scope of work included a site visit, a description <br />of the field work, sampling of the domestic well, soil and <br />groundwater in the area of the former UST excavation and a report <br />of Pindinge, summary and recommendations. <br />Based on a review of the U S GEOLOGICAL SURVEY map, the implied... <br />regional gradient is,'westerly. <br />FIELD WORK <br />On April 27, 2001, John F. Cummings of JPCA took samples of soil <br />and water from the subject property. ae met with Phillip Vallejo <br />of Central Valley Construction, William Maloney of Maloney <br />Construction and Tony Mocetti a local contractor. The excavator <br />for the digging of the trench in the former tank areas was <br />provided by Maloney Construction. <br />A Photoionization Detector (PIA) was employed to field screen, in <br />order to determine the organic vapor, if any, boing emitted from <br />the excavated soil.! Tha PID reading for background was 2 or 3 <br />Parts Per Million [PPM]. <br />The former UST area was identified by Tony Mocetti, a local <br />contractor, who had 'worked on the property when the UST and AST <br />were removed from the site. His local for the AST and UST <br />locations were confirmed by aerial photographs of the site. <br />The first excavation was a trench in the former UST area. From <br />the surface to approximately 12 feet below grade the vapor <br />readings were in the range of 2 - 3 PPM. <br />A soil sample (Soil ,l) was collected, in a clean brass liner, at <br />approximately 14 fest below grade. This sample was taken in the <br />native soil at a level reported to be below the former UST. <br />At approximately 15,faet below grade a moist, sandy, grey black <br />Ions was encountered. The PID reading ranged from 28 - 40 PPM. <br />One soil sample (Soil 2) was collected from this sandy lens. <br />Groundwater was encountered at approximately 18 feet. A clean <br />bailor was used to collect the groundwater sample. The <br />groundwater sample was placed in 4-40ml VOAs with Teflon, seals <br />and Ona Liter pre cleaned glass container with Teflon seal. <br />2 <br />