Laserfiche WebLink
PUBLIC HEALTH SERVICE'S <br /> 10 co <br /> -��A <br /> SAN JOAQUIN COUNTY ^; <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> �!FOR <br /> 304 East Weber Avenue, Third Floor ' Stockton, CA 95202 r; i; <br /> 2091468-3420 d � <br /> JONATHAN MARLOWE <br /> MARLOWE PROPERTIES JUN .. 11999 <br /> P O BOX 150211 <br /> SAN RAFAEL CA 94915-0211 <br /> RE: Marlowe Property SITE CODE: 1828 <br /> 4648 Waterloo Road <br /> Stockton CA 95215 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) <br /> has reviewed the "Quarterly Report—April 1999„ dated May 7, 1999, that was prepared <br /> by Advanced GeoEnvironmental (AGE) for the above referenced site and has the <br /> following comments. <br /> The report details the results of the routine quarterly groundwater monitoring event <br /> which took place on April 26, 1999, and the results of the soil vapor extraction and in-situ <br /> air sparge (SVEIIAS) pilot test that took place during March and April, 1999. <br /> According to the report, the SVEIIAS pilot test system was operational for 590 hours and <br /> removed an estimated 81 gallons of petroleum hydrocarbons from the soil_ This <br /> represents approximately 27% of the total petroleum hydrocarbon impact to soil at this <br /> site, based on the mass-balance calculations which were prepared for the "Revised <br /> Corrective Action Plan — January 1997", that estimated the total apparent volume of <br /> petroleum hydrocarbon impact to soil at 300 gallons. <br /> Four vapor samples were collected for analysis during the SVEIIAS pilot ata teThe st. <br /> petroleum <br /> sample, collected on 3123199, Subseced ue t camp e000 s were collected billion <br /> on 3!31!99, 4107199 <br /> hydrocarbons as gas (TPHg). q <br /> and 4116199 and evidenced 2,800, 2,600 and 2,700 ppb TPHg respectively. These <br /> results indicate that at the end of the pilot test significant amounts of soil petroleum <br /> hydrocarbons were still being extracted by the system. <br /> The analytical results from the groundwater monitoring event evidenced decreased <br /> amounts of dissolved petroleum hydrocarbons from the previous quarters results. Most <br /> significantly, vapor well 91 (VW-1), which is located in the former tank pit area and has <br /> historically been the most heavily impacted well, showed decreases from 4,300 ppb <br /> TPHg, 20 ppb benzene, 140 ppb ethylbenzene, 520 ppb xylene, 1.1 ppb methyl tertiary <br /> butyl ether (MTBE) and 8.9 ppb tertiary butyl alcohol on 1108199, to non-detect for all <br /> constituents. As stated in the report, section 5.0 Discussion and Conclusions, it is <br /> unknown whether these decreases are related to the operation of the SVE/lAS system <br /> or are a result of the 5.29-foot rise in groundwater levels. <br /> A Division of Stn Jnayuin County Health Care Services <br /> 4 <br />